| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/08/05 12:19 | flow | patch-triage |
1mArgs:null Results: {
"EnableConfigs": [
"NETCONSOLE",
"NETCONSOLE_DYNAMIC",
"CONFIGFS_FS"
],
"FocusSymbols": [
"update_userdata",
"send_ext_msg_udp",
"userdatum_value_store",
"userdatum_drop",
"netconsole_write_ext"
],
"Reasoning": "The patch introduces RCU protection for the `userdata` payload in the netconsole driver. It modifies how userdata is updated via configfs and how it is read during message transmission. This is a functional change in the core kernel (drivers/net/netconsole.c) that prevents use-after-free and data races. It is worth fuzzing to ensure the RCU implementation is correct and doesn't introduce memory leaks or crashes under concurrent configfs updates and console writes.",
"WorthFuzzing": true
} |
| 1/1 | 2026/08/05 12:19 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 1ff110cfa1e4aa649daaf25b0cba4c9d4183b4e7\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Wed Aug 5 12:19:34 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c\nindex 862001d09aa84..14092fb15f6d0 100644\n--- a/drivers/net/netconsole.c\n+++ b/drivers/net/netconsole.c\n@@ -135,13 +135,27 @@ enum target_state {\n \tSTATE_DEACTIVATED,\n };\n \n+/**\n+ * struct netcons_userdata - Formatted userdata payload of a target.\n+ * @rcu:\tUsed to free the payload after a grace period.\n+ * @length:\tLength of @data, excluding the NUL terminator.\n+ * @data:\tFormatted \" key=value\\n\" entries, NUL terminated.\n+ *\n+ * Immutable once published, so the transmit path never observes @data and\n+ * @length disagreeing.\n+ */\n+struct netcons_userdata {\n+\tstruct rcu_head\t\trcu;\n+\tsize_t\t\t\tlength;\n+\tchar\t\t\tdata[];\n+};\n+\n /**\n * struct netconsole_target - Represents a configured netconsole target.\n * @list:\tLinks this target into the target_list.\n * @group:\tLinks us into the configfs subsystem hierarchy.\n * @userdata_group:\tLinks to the userdata configfs hierarchy\n- * @userdata:\t\tCached, formatted string of append\n- * @userdata_length:\tString length of userdata.\n+ * @userdata:\t\tCached, formatted userdata payload. RCU protected.\n * @sysdata:\t\tCached, formatted string of append\n * @sysdata_fields:\tSysdata features enabled.\n * @msgcounter:\tMessage sent counter.\n@@ -176,8 +190,7 @@ struct netconsole_target {\n #ifdef\tCONFIG_NETCONSOLE_DYNAMIC\n \tstruct config_group\tgroup;\n \tstruct config_group\tuserdata_group;\n-\tchar\t\t\t*userdata;\n-\tsize_t\t\t\tuserdata_length;\n+\tstruct netcons_userdata __rcu *userdata;\n \tchar\t\t\tsysdata[MAX_EXTRADATA_ENTRY_LEN * MAX_SYSDATA_ITEMS];\n \n \t/* bit-wise with sysdata_feature bits */\n@@ -1059,12 +1072,11 @@ static int calc_userdata_len(struct netconsole_target *nt)\n \n static int update_userdata(struct netconsole_target *nt)\n {\n+\tstruct netcons_userdata *new = NULL;\n+\tstruct netcons_userdata *old;\n \tstruct userdatum *udm_item;\n \tstruct config_item *item;\n \tstruct list_head *entry;\n-\tchar *old_buf = NULL;\n-\tchar *new_buf = NULL;\n-\tunsigned long flags;\n \tint offset = 0;\n \tint len;\n \n@@ -1076,8 +1088,8 @@ static int update_userdata(struct netconsole_target *nt)\n \n \t/* Allocate new buffer */\n \tif (len) {\n-\t\tnew_buf = kmalloc(len + 1, GFP_KERNEL);\n-\t\tif (!new_buf)\n+\t\tnew = kmalloc_flex(*new, data, len + 1);\n+\t\tif (!new)\n \t\t\treturn -ENOMEM;\n \t}\n \n@@ -1087,22 +1099,21 @@ static int update_userdata(struct netconsole_target *nt)\n \t\tudm_item = to_userdatum(item);\n \t\t/* Skip userdata with no value set */\n \t\tif (udm_item-\u003evalue[0]) {\n-\t\t\toffset += scnprintf(\u0026new_buf[offset], len + 1 - offset,\n+\t\t\toffset += scnprintf(\u0026new-\u003edata[offset],\n+\t\t\t\t\t len + 1 - offset,\n \t\t\t\t\t \" %s=%s\\n\", item-\u003eci_name,\n \t\t\t\t\t udm_item-\u003evalue);\n \t\t}\n \t}\n \n \tWARN_ON_ONCE(offset != len);\n+\tif (new)\n+\t\tnew-\u003elength = offset;\n \n-\t/* Switch to new buffer and free old buffer */\n-\tspin_lock_irqsave(\u0026target_list_lock, flags);\n-\told_buf = nt-\u003euserdata;\n-\tnt-\u003euserdata = new_buf;\n-\tnt-\u003euserdata_length = offset;\n-\tspin_unlock_irqrestore(\u0026target_list_lock, flags);\n-\n-\tkfree(old_buf);\n+\t/* Writers are serialized by dynamic_netconsole_mutex. */\n+\told = rcu_replace_pointer(nt-\u003euserdata, new,\n+\t\t\t\t lockdep_is_held(\u0026dynamic_netconsole_mutex));\n+\tkfree_rcu(old, rcu);\n \n \treturn 0;\n }\n@@ -1392,7 +1403,7 @@ static void netconsole_target_release(struct config_item *item)\n {\n \tstruct netconsole_target *nt = to_target(item);\n \n-\tkfree(nt-\u003euserdata);\n+\tkfree(rcu_access_pointer(nt-\u003euserdata));\n \tkfree(nt);\n }\n \n@@ -1926,14 +1937,13 @@ static void send_udp(struct netconsole_target *nt, const char *msg, int len)\n static void send_msg_no_fragmentation(struct netconsole_target *nt,\n \t\t\t\t const char *msg,\n \t\t\t\t int msg_len,\n-\t\t\t\t int release_len)\n+\t\t\t\t int release_len,\n+\t\t\t\t const struct netcons_userdata *userdata)\n {\n-\tconst char *userdata = NULL;\n \tconst char *sysdata = NULL;\n \tconst char *release;\n \n #ifdef CONFIG_NETCONSOLE_DYNAMIC\n-\tuserdata = nt-\u003euserdata;\n \tsysdata = nt-\u003esysdata;\n #endif\n \n@@ -1950,7 +1960,7 @@ static void send_msg_no_fragmentation(struct netconsole_target *nt,\n \tif (userdata)\n \t\tmsg_len += scnprintf(\u0026nt-\u003ebuf[msg_len],\n \t\t\t\t sizeof(nt-\u003ebuf) - msg_len, \"%s\",\n-\t\t\t\t userdata);\n+\t\t\t\t userdata-\u003edata);\n \n \tif (sysdata)\n \t\tmsg_len += scnprintf(\u0026nt-\u003ebuf[msg_len],\n@@ -1970,7 +1980,8 @@ static void append_release(char *buf)\n \n static void send_fragmented_body(struct netconsole_target *nt,\n \t\t\t\t const char *msgbody_ptr, int header_len,\n-\t\t\t\t int msgbody_len, int sysdata_len)\n+\t\t\t\t int msgbody_len, int sysdata_len,\n+\t\t\t\t const struct netcons_userdata *userdata)\n {\n \tconst char *userdata_ptr = NULL;\n \tconst char *sysdata_ptr = NULL;\n@@ -1981,12 +1992,12 @@ static void send_fragmented_body(struct netconsole_target *nt,\n \tint userdata_len = 0;\n \n #ifdef CONFIG_NETCONSOLE_DYNAMIC\n-\tuserdata_ptr = nt-\u003euserdata;\n \tsysdata_ptr = nt-\u003esysdata;\n-\tuserdata_len = nt-\u003euserdata_length;\n #endif\n-\tif (WARN_ON_ONCE(!userdata_ptr \u0026\u0026 userdata_len != 0))\n-\t\treturn;\n+\tif (userdata) {\n+\t\tuserdata_ptr = userdata-\u003edata;\n+\t\tuserdata_len = userdata-\u003elength;\n+\t}\n \n \tif (WARN_ON_ONCE(!sysdata_ptr \u0026\u0026 sysdata_len != 0))\n \t\treturn;\n@@ -2063,7 +2074,8 @@ static void send_msg_fragmented(struct netconsole_target *nt,\n \t\t\t\tconst char *msg,\n \t\t\t\tint msg_len,\n \t\t\t\tint release_len,\n-\t\t\t\tint sysdata_len)\n+\t\t\t\tint sysdata_len,\n+\t\t\t\tconst struct netcons_userdata *userdata)\n {\n \tint header_len, msgbody_len;\n \tconst char *msgbody;\n@@ -2092,7 +2104,7 @@ static void send_msg_fragmented(struct netconsole_target *nt,\n \t * will be replaced\n \t */\n \tsend_fragmented_body(nt, msgbody, header_len, msgbody_len,\n-\t\t\t sysdata_len);\n+\t\t\t sysdata_len, userdata);\n }\n \n /**\n@@ -2107,25 +2119,33 @@ static void send_msg_fragmented(struct netconsole_target *nt,\n static void send_ext_msg_udp(struct netconsole_target *nt,\n \t\t\t struct nbcon_write_context *wctxt)\n {\n+\tconst struct netcons_userdata *userdata = NULL;\n \tint userdata_len = 0;\n \tint release_len = 0;\n \tint sysdata_len = 0;\n \tint len;\n \n+\t/* Keeps the payload picked below alive until the last send_udp(). */\n+\trcu_read_lock();\n+\n #ifdef CONFIG_NETCONSOLE_DYNAMIC\n \tsysdata_len = prepare_sysdata(nt, wctxt);\n-\tuserdata_len = nt-\u003euserdata_length;\n+\tuserdata = rcu_dereference(nt-\u003euserdata);\n+\tif (userdata)\n+\t\tuserdata_len = userdata-\u003elength;\n #endif\n \tif (nt-\u003erelease)\n \t\trelease_len = strlen(init_utsname()-\u003erelease) + 1;\n \n \tlen = wctxt-\u003elen + release_len + sysdata_len + userdata_len;\n \tif (len \u003c= MAX_PRINT_CHUNK)\n-\t\treturn send_msg_no_fragmentation(nt, wctxt-\u003eoutbuf,\n-\t\t\t\t\t\t wctxt-\u003elen, release_len);\n+\t\tsend_msg_no_fragmentation(nt, wctxt-\u003eoutbuf, wctxt-\u003elen,\n+\t\t\t\t\t release_len, userdata);\n+\telse\n+\t\tsend_msg_fragmented(nt, wctxt-\u003eoutbuf, wctxt-\u003elen, release_len,\n+\t\t\t\t sysdata_len, userdata);\n \n-\treturn send_msg_fragmented(nt, wctxt-\u003eoutbuf, wctxt-\u003elen, release_len,\n-\t\t\t\t sysdata_len);\n+\trcu_read_unlock();\n }\n \n static void send_msg_udp(struct netconsole_target *nt, const char *msg,\n@@ -2357,7 +2377,7 @@ static void free_param_target(struct netconsole_target *nt)\n \tcancel_work_sync(\u0026nt-\u003eresume_wq);\n \tnetpoll_cleanup(\u0026nt-\u003enp);\n #ifdef\tCONFIG_NETCONSOLE_DYNAMIC\n-\tkfree(nt-\u003euserdata);\n+\tkfree(rcu_access_pointer(nt-\u003euserdata));\n #endif\n \tkfree(nt);\n }\ndiff --git a/tools/testing/selftests/drivers/net/netconsole/Makefile b/tools/testing/selftests/drivers/net/netconsole/Makefile\nindex b56c70b7e2742..f0674c0017fc4 100644\n--- a/tools/testing/selftests/drivers/net/netconsole/Makefile\n+++ b/tools/testing/selftests/drivers/net/netconsole/Makefile\n@@ -13,6 +13,7 @@ TEST_PROGS := \\\n \tnetcons_resume.sh \\\n \tnetcons_sysdata.sh \\\n \tnetcons_torture.sh \\\n+\tnetcons_userdata.sh \\\n # end of TEST_PROGS\n \n include ../../../lib.mk\ndiff --git a/tools/testing/selftests/drivers/net/netconsole/netcons_userdata.sh b/tools/testing/selftests/drivers/net/netconsole/netcons_userdata.sh\nnew file mode 100755\nindex 0000000000000..113903f4ce1c5\n--- /dev/null\n+++ b/tools/testing/selftests/drivers/net/netconsole/netcons_userdata.sh\n@@ -0,0 +1,229 @@\n+#!/usr/bin/env bash\n+# SPDX-License-Identifier: GPL-2.0\n+\n+# Exercise the netconsole userdata payload.\n+#\n+# The first part checks that the payload the target transmits follows what\n+# configfs says: a value shows up in the next message, an update replaces the\n+# previous one, clearing the value drops the entry, and so does removing the\n+# key.\n+#\n+# The second part rewrites values, creates and deletes keys, and clears the\n+# payload entirely while messages are being sent, so the transmit path keeps\n+# picking up payloads that are being replaced underneath it. It runs twice,\n+# once with a payload small enough to fit in a single packet and once large\n+# enough to be fragmented.\n+#\n+# Author: Breno Leitao \u003cleitao@debian.org\u003e\n+\n+set -euo pipefail\n+\n+SCRIPTDIR=$(dirname \"$(readlink -e \"${BASH_SOURCE[0]}\")\")\n+\n+source \"${SCRIPTDIR}\"/../lib/sh/lib_netcons.sh\n+\n+# Number of times each torture worker loops\n+ITERATIONS=${1:-200}\n+\n+# Keys owned by each torture worker. Workers do not share keys, so a failing\n+# configfs operation means a real problem and not a lost race.\n+CHURN_KEY=\"churnkey\"\n+TRANSIENT_KEY=\"transientkey\"\n+# Number of keys used to push a message past MAX_PRINT_CHUNK\n+BULK_KEYS=8\n+\n+USERDATA_DIR=\"${NETCONS_PATH}/userdata\"\n+# Values are capped at MAX_EXTRADATA_VALUE_LEN(200) bytes, so ${BULK_KEYS}\n+# entries of this size are enough to force fragmentation\n+LONG_VALUE=$(printf -- 'v%.0s' {1..190})\n+\n+function write_key() {\n+\tlocal KEY=\"${1}\"\n+\tlocal VALUE=\"${2}\"\n+\n+\tmkdir -p \"${USERDATA_DIR}/${KEY}\"\n+\techo \"${VALUE}\" \u003e \"${USERDATA_DIR}/${KEY}/value\"\n+}\n+\n+# Send a single message and capture it on the destination interface\n+function send_and_capture() {\n+\trm -f \"${OUTPUT_FILE}\"\n+\n+\tlisten_port_and_save_to \"${OUTPUT_FILE}\" \u0026\n+\twait_for_port \"${NAMESPACE}\" \"${PORT}\" \"${IP_VERSION}\"\n+\techo \"${MSG}: ${TARGET}\" \u003e /dev/kmsg\n+\tbusywait \"${BUSYWAIT_TIMEOUT}\" test -s \"${OUTPUT_FILE}\" || true\n+\tpkill_socat\n+\tvalidate_msg \"${OUTPUT_FILE}\"\n+}\n+\n+function expect_in_msg() {\n+\tlocal WANTED=\"${1}\"\n+\n+\tif ! grep -q -- \"${WANTED}\" \"${OUTPUT_FILE}\"; then\n+\t\techo \"FAIL: '${WANTED}' not found in ${OUTPUT_FILE}\" \u003e\u00262\n+\t\tcat \"${OUTPUT_FILE}\" \u003e\u00262\n+\t\texit \"${ksft_fail}\"\n+\tfi\n+}\n+\n+function expect_not_in_msg() {\n+\tlocal UNWANTED=\"${1}\"\n+\n+\tif grep -q -- \"${UNWANTED}\" \"${OUTPUT_FILE}\"; then\n+\t\techo \"FAIL: '${UNWANTED}' found in ${OUTPUT_FILE}\" \u003e\u00262\n+\t\tcat \"${OUTPUT_FILE}\" \u003e\u00262\n+\t\texit \"${ksft_fail}\"\n+\tfi\n+}\n+\n+# Every write publishes a new payload and frees the previous one. An empty\n+# value is skipped when the payload is formatted, so this also drives the\n+# target through having no payload at all.\n+function churn_value() {\n+\tlocal i\n+\n+\tfor i in $(seq \"${ITERATIONS}\")\n+\tdo\n+\t\techo \"value${i}\" \u003e \"${USERDATA_DIR}/${CHURN_KEY}/value\"\n+\t\techo \u003e \"${USERDATA_DIR}/${CHURN_KEY}/value\"\n+\tdone\n+}\n+\n+# Create and delete a key underneath the sender\n+function churn_key() {\n+\tlocal i\n+\n+\tfor i in $(seq \"${ITERATIONS}\")\n+\tdo\n+\t\tmkdir \"${USERDATA_DIR}/${TRANSIENT_KEY}\"\n+\t\techo \"transient${i}\" \u003e \"${USERDATA_DIR}/${TRANSIENT_KEY}/value\"\n+\t\trmdir \"${USERDATA_DIR}/${TRANSIENT_KEY}\"\n+\tdone\n+}\n+\n+# Keep the transmit path busy while the payload is being replaced\n+function send_messages() {\n+\tlocal i\n+\n+\tfor i in $(seq \"${ITERATIONS}\")\n+\tdo\n+\t\techo \"${MSG}: ${TARGET} ${i}\" \u003e /dev/kmsg\n+\tdone\n+}\n+\n+# Run the workers concurrently and fail if any of them hits an error\n+function run_workers() {\n+\tlocal PIDS=()\n+\tlocal WORKER\n+\tlocal RET=0\n+\tlocal PID\n+\n+\tfor WORKER in \"$@\"\n+\tdo\n+\t\t\"${WORKER}\" \u0026\n+\t\tPIDS+=(\"$!\")\n+\tdone\n+\n+\t# Reap every worker before reporting a failure, otherwise a surviving\n+\t# worker keeps writing to configfs while the exit trap cleans it up.\n+\tfor PID in \"${PIDS[@]}\"\n+\tdo\n+\t\twait \"${PID}\" || RET=1\n+\tdone\n+\n+\tif [[ \"${RET}\" -ne 0 ]]\n+\tthen\n+\t\techo \"FAIL: userdata torture worker failed\" \u003e\u00262\n+\t\texit \"${ksft_fail}\"\n+\tfi\n+}\n+\n+function create_bulk_keys() {\n+\tlocal i\n+\n+\tfor i in $(seq \"${BULK_KEYS}\")\n+\tdo\n+\t\twrite_key \"bulk${i}\" \"${LONG_VALUE}\"\n+\tdone\n+}\n+\n+function delete_bulk_keys() {\n+\tlocal i\n+\n+\tfor i in $(seq \"${BULK_KEYS}\")\n+\tdo\n+\t\trmdir \"${USERDATA_DIR}/bulk${i}\"\n+\tdone\n+}\n+\n+# ========== #\n+# Start here #\n+# ========== #\n+\n+modprobe netdevsim 2\u003e /dev/null || true\n+modprobe netconsole 2\u003e /dev/null || true\n+\n+IP_VERSION=\"ipv4\"\n+# The content of kmsg will be saved to the following file\n+OUTPUT_FILE=\"/tmp/${TARGET}\"\n+\n+# Check for basic system dependency and exit if not found\n+check_for_dependencies\n+# Set current loglevel to KERN_INFO(6), and default to KERN_NOTICE(5)\n+echo \"6 5\" \u003e /proc/sys/kernel/printk\n+# Remove the namespace, interfaces and netconsole target on exit\n+trap cleanup EXIT\n+# Create one namespace and two interfaces\n+set_network \"${IP_VERSION}\"\n+# Create a dynamic target for netconsole\n+create_dynamic_target\n+\n+# ===================================================\n+# TEST #1\n+# A value written to configfs reaches the destination\n+# ===================================================\n+write_key \"${USERDATA_KEY}\" \"first\"\n+send_and_capture\n+expect_in_msg \"${USERDATA_KEY}=first\"\n+\n+# ===================================================\n+# TEST #2\n+# Updating the value replaces the previous payload\n+# ===================================================\n+write_key \"${USERDATA_KEY}\" \"second\"\n+send_and_capture\n+expect_in_msg \"${USERDATA_KEY}=second\"\n+expect_not_in_msg \"${USERDATA_KEY}=first\"\n+\n+# ===================================================\n+# TEST #3\n+# Clearing the value drops the entry\n+# ===================================================\n+echo \u003e \"${USERDATA_DIR}/${USERDATA_KEY}/value\"\n+send_and_capture\n+expect_not_in_msg \"${USERDATA_KEY}=\"\n+\n+# ===================================================\n+# TEST #4\n+# Removing the key drops the entry\n+# ===================================================\n+write_key \"${USERDATA_KEY}\" \"third\"\n+rmdir \"${USERDATA_DIR}/${USERDATA_KEY}\"\n+send_and_capture\n+expect_not_in_msg \"${USERDATA_KEY}=\"\n+rm \"${OUTPUT_FILE}\"\n+\n+# ===================================================\n+# TEST #5\n+# Torture the payload while messages are being sent,\n+# first unfragmented and then fragmented\n+# ===================================================\n+write_key \"${CHURN_KEY}\" \"${USERDATA_VALUE}\"\n+run_workers churn_value churn_key send_messages\n+\n+create_bulk_keys\n+run_workers churn_value churn_key send_messages\n+delete_bulk_keys\n+\n+exit \"${ksft_pass}\"\n"
} |
| 2/1 | 2026/08/05 12:19 | agent | patch-evaluator |
1mModel:best-expensive Args: null Results: {
"EnableConfigs": [
"NETCONSOLE",
"NETCONSOLE_DYNAMIC",
"CONFIGFS_FS"
],
"FocusSymbols": [
"update_userdata",
"send_ext_msg_udp",
"userdatum_value_store",
"userdatum_drop",
"netconsole_write_ext"
],
"Reasoning": "The patch introduces RCU protection for the `userdata` payload in the netconsole driver. It modifies how userdata is updated via configfs and how it is read during message transmission. This is a functional change in the core kernel (drivers/net/netconsole.c) that prevents use-after-free and data races. It is worth fuzzing to ensure the RCU implementation is correct and doesn't introduce memory leaks or crashes under concurrent configfs updates and console writes.",
"WorthFuzzing": true
}Instruction: You are an expert Linux kernel maintainer. Your job is to review a provided patch series and determine if it makes functional changes to the kernel that should be fuzzed. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively use your code access tools to examine the actual source code and confirm any assumptions. Return WorthFuzzing=false if the patch only contains: - Modifications to Documentation/, Kconfig files, or code comments. - Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints. - Changes to numeric constants or macros that do not functionally alter execution flow. - Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim). - Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU. - Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove) that are executed only during PCI hot-unplug or sysfs driver unbind operations. If it modifies reachable core kernel logic, drivers, or architectures, use your code search tools to verify the code can be executed, then return WorthFuzzing=true. When returning WorthFuzzing=true, you MUST ALSO: 1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols. Avoid listing generic hot-path functions to prevent skewed test distributions. Prefer non-static, non-inlined API entrypoint functions over internal static helper functions (which are inlined by the compiler and do not have distinct symbol addresses). 2. Identify any specific CONFIG_ options required to properly test this new/modified feature. Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions. Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: For your convenience, here is the diff of the changes:
commit 1ff110cfa1e4aa649daaf25b0cba4c9d4183b4e7
Author: syz-cluster <triage@syzkaller.com>
Date: Wed Aug 5 12:19:34 2026 +0000
syz-cluster: applied patch under review
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 862001d09aa84..14092fb15f6d0 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -135,13 +135,27 @@ enum target_state {
STATE_DEACTIVATED,
};
+/**
+ * struct netcons_userdata - Formatted userdata payload of a target.
+ * @rcu: Used to free the payload after a grace period.
+ * @length: Length of @data, excluding the NUL terminator.
+ * @data: Formatted " key=value\n" entries, NUL terminated.
+ *
+ * Immutable once published, so the transmit path never observes @data and
+ * @length disagreeing.
+ */
+struct netcons_userdata {
+ struct rcu_head rcu;
+ size_t length;
+ char data[];
+};
+
/**
* struct netconsole_target - Represents a configured netconsole target.
* @list: Links this target into the target_list.
* @group: Links us into the configfs subsystem hierarchy.
* @userdata_group: Links to the userdata configfs hierarchy
- * @userdata: Cached, formatted string of append
- * @userdata_length: String length of userdata.
+ * @userdata: Cached, formatted userdata payload. RCU protected.
* @sysdata: Cached, formatted string of append
* @sysdata_fields: Sysdata features enabled.
* @msgcounter: Message sent counter.
@@ -176,8 +190,7 @@ struct netconsole_target {
#ifdef CONFIG_NETCONSOLE_DYNAMIC
struct config_group group;
struct config_group userdata_group;
- char *userdata;
- size_t userdata_length;
+ struct netcons_userdata __rcu *userdata;
char sysdata[MAX_EXTRADATA_ENTRY_LEN * MAX_SYSDATA_ITEMS];
/* bit-wise with sysdata_feature bits */
@@ -1059,12 +1072,11 @@ static int calc_userdata_len(struct netconsole_target *nt)
static int update_userdata(struct netconsole_target *nt)
{
+ struct netcons_userdata *new = NULL;
+ struct netcons_userdata *old;
struct userdatum *udm_item;
struct config_item *item;
struct list_head *entry;
- char *old_buf = NULL;
- char *new_buf = NULL;
- unsigned long flags;
int offset = 0;
int len;
@@ -1076,8 +1088,8 @@ static int update_userdata(struct netconsole_target *nt)
/* Allocate new buffer */
if (len) {
- new_buf = kmalloc(len + 1, GFP_KERNEL);
- if (!new_buf)
+ new = kmalloc_flex(*new, data, len + 1);
+ if (!new)
return -ENOMEM;
}
@@ -1087,22 +1099,21 @@ static int update_userdata(struct netconsole_target *nt)
udm_item = to_userdatum(item);
/* Skip userdata with no value set */
if (udm_item->value[0]) {
- offset += scnprintf(&new_buf[offset], len + 1 - offset,
+ offset += scnprintf(&new->data[offset],
+ len + 1 - offset,
" %s=%s\n", item->ci_name,
udm_item->value);
}
}
WARN_ON_ONCE(offset != len);
+ if (new)
+ new->length = offset;
- /* Switch to new buffer and free old buffer */
- spin_lock_irqsave(&target_list_lock, flags);
- old_buf = nt->userdata;
- nt->userdata = new_buf;
- nt->userdata_length = offset;
- spin_unlock_irqrestore(&target_list_lock, flags);
-
- kfree(old_buf);
+ /* Writers are serialized by dynamic_netconsole_mutex. */
+ old = rcu_replace_pointer(nt->userdata, new,
+ lockdep_is_held(&dynamic_netconsole_mutex));
+ kfree_rcu(old, rcu);
return 0;
}
@@ -1392,7 +1403,7 @@ static void netconsole_target_release(struct config_item *item)
{
struct netconsole_target *nt = to_target(item);
- kfree(nt->userdata);
+ kfree(rcu_access_pointer(nt->userdata));
kfree(nt);
}
@@ -1926,14 +1937,13 @@ static void send_udp(struct netconsole_target *nt, const char *msg, int len)
static void send_msg_no_fragmentation(struct netconsole_target *nt,
const char *msg,
int msg_len,
- int release_len)
+ int release_len,
+ const struct netcons_userdata *userdata)
{
- const char *userdata = NULL;
const char *sysdata = NULL;
const char *release;
#ifdef CONFIG_NETCONSOLE_DYNAMIC
- userdata = nt->userdata;
sysdata = nt->sysdata;
#endif
@@ -1950,7 +1960,7 @@ static void send_msg_no_fragmentation(struct netconsole_target *nt,
if (userdata)
msg_len += scnprintf(&nt->buf[msg_len],
sizeof(nt->buf) - msg_len, "%s",
- userdata);
+ userdata->data);
if (sysdata)
msg_len += scnprintf(&nt->buf[msg_len],
@@ -1970,7 +1980,8 @@ static void append_release(char *buf)
static void send_fragmented_body(struct netconsole_target *nt,
const char *msgbody_ptr, int header_len,
- int msgbody_len, int sysdata_len)
+ int msgbody_len, int sysdata_len,
+ const struct netcons_userdata *userdata)
{
const char *userdata_ptr = NULL;
const char *sysdata_ptr = NULL;
@@ -1981,12 +1992,12 @@ static void send_fragmented_body(struct netconsole_target *nt,
int userdata_len = 0;
#ifdef CONFIG_NETCONSOLE_DYNAMIC
- userdata_ptr = nt->userdata;
sysdata_ptr = nt->sysdata;
- userdata_len = nt->userdata_length;
#endif
- if (WARN_ON_ONCE(!userdata_ptr && userdata_len != 0))
- return;
+ if (userdata) {
+ userdata_ptr = userdata->data;
+ userdata_len = userdata->length;
+ }
if (WARN_ON_ONCE(!sysdata_ptr && sysdata_len != 0))
return;
@@ -2063,7 +2074,8 @@ static void send_msg_fragmented(struct netconsole_target *nt,
const char *msg,
int msg_len,
int release_len,
- int sysdata_len)
+ int sysdata_len,
+ const struct netcons_userdata *userdata)
{
int header_len, msgbody_len;
const char *msgbody;
@@ -2092,7 +2104,7 @@ static void send_msg_fragmented(struct netconsole_target *nt,
* will be replaced
*/
send_fragmented_body(nt, msgbody, header_len, msgbody_len,
- sysdata_len);
+ sysdata_len, userdata);
}
/**
@@ -2107,25 +2119,33 @@ static void send_msg_fragmented(struct netconsole_target *nt,
static void send_ext_msg_udp(struct netconsole_target *nt,
struct nbcon_write_context *wctxt)
{
+ const struct netcons_userdata *userdata = NULL;
int userdata_len = 0;
int release_len = 0;
int sysdata_len = 0;
int len;
+ /* Keeps the payload picked below alive until the last send_udp(). */
+ rcu_read_lock();
+
#ifdef CONFIG_NETCONSOLE_DYNAMIC
sysdata_len = prepare_sysdata(nt, wctxt);
- userdata_len = nt->userdata_length;
+ userdata = rcu_dereference(nt->userdata);
+ if (userdata)
+ userdata_len = userdata->length;
#endif
if (nt->release)
release_len = strlen(init_utsname()->release) + 1;
len = wctxt->len + release_len + sysdata_len + userdata_len;
if (len <= MAX_PRINT_CHUNK)
- return send_msg_no_fragmentation(nt, wctxt->outbuf,
- wctxt->len, release_len);
+ send_msg_no_fragmentation(nt, wctxt->outbuf, wctxt->len,
+ release_len, userdata);
+ else
+ send_msg_fragmented(nt, wctxt->outbuf, wctxt->len, release_len,
+ sysdata_len, userdata);
- return send_msg_fragmented(nt, wctxt->outbuf, wctxt->len, release_len,
- sysdata_len);
+ rcu_read_unlock();
}
static void send_msg_udp(struct netconsole_target *nt, const char *msg,
@@ -2357,7 +2377,7 @@ static void free_param_target(struct netconsole_target *nt)
cancel_work_sync(&nt->resume_wq);
netpoll_cleanup(&nt->np);
#ifdef CONFIG_NETCONSOLE_DYNAMIC
- kfree(nt->userdata);
+ kfree(rcu_access_pointer(nt->userdata));
#endif
kfree(nt);
}
diff --git a/tools/testing/selftests/drivers/net/netconsole/Makefile b/tools/testing/selftests/drivers/net/netconsole/Makefile
index b56c70b7e2742..f0674c0017fc4 100644
--- a/tools/testing/selftests/drivers/net/netconsole/Makefile
+++ b/tools/testing/selftests/drivers/net/netconsole/Makefile
@@ -13,6 +13,7 @@ TEST_PROGS := \
netcons_resume.sh \
netcons_sysdata.sh \
netcons_torture.sh \
+ netcons_userdata.sh \
# end of TEST_PROGS
include ../../../lib.mk
diff --git a/tools/testing/selftests/drivers/net/netconsole/netcons_userdata.sh b/tools/testing/selftests/drivers/net/netconsole/netcons_userdata.sh
new file mode 100755
index 0000000000000..113903f4ce1c5
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/netconsole/netcons_userdata.sh
@@ -0,0 +1,229 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: GPL-2.0
+
+# Exercise the netconsole userdata payload.
+#
+# The first part checks that the payload the target transmits follows what
+# configfs says: a value shows up in the next message, an update replaces the
+# previous one, clearing the value drops the entry, and so does removing the
+# key.
+#
+# The second part rewrites values, creates and deletes keys, and clears the
+# payload entirely while messages are being sent, so the transmit path keeps
+# picking up payloads that are being replaced underneath it. It runs twice,
+# once with a payload small enough to fit in a single packet and once large
+# enough to be fragmented.
+#
+# Author: Breno Leitao <leitao@debian.org>
+
+set -euo pipefail
+
+SCRIPTDIR=$(dirname "$(readlink -e "${BASH_SOURCE[0]}")")
+
+source "${SCRIPTDIR}"/../lib/sh/lib_netcons.sh
+
+# Number of times each torture worker loops
+ITERATIONS=${1:-200}
+
+# Keys owned by each torture worker. Workers do not share keys, so a failing
+# configfs operation means a real problem and not a lost race.
+CHURN_KEY="churnkey"
+TRANSIENT_KEY="transientkey"
+# Number of keys used to push a message past MAX_PRINT_CHUNK
+BULK_KEYS=8
+
+USERDATA_DIR="${NETCONS_PATH}/userdata"
+# Values are capped at MAX_EXTRADATA_VALUE_LEN(200) bytes, so ${BULK_KEYS}
+# entries of this size are enough to force fragmentation
+LONG_VALUE=$(printf -- 'v%.0s' {1..190})
+
+function write_key() {
+ local KEY="${1}"
+ local VALUE="${2}"
+
+ mkdir -p "${USERDATA_DIR}/${KEY}"
+ echo "${VALUE}" > "${USERDATA_DIR}/${KEY}/value"
+}
+
+# Send a single message and capture it on the destination interface
+function send_and_capture() {
+ rm -f "${OUTPUT_FILE}"
+
+ listen_port_and_save_to "${OUTPUT_FILE}" &
+ wait_for_port "${NAMESPACE}" "${PORT}" "${IP_VERSION}"
+ echo "${MSG}: ${TARGET}" > /dev/kmsg
+ busywait "${BUSYWAIT_TIMEOUT}" test -s "${OUTPUT_FILE}" || true
+ pkill_socat
+ validate_msg "${OUTPUT_FILE}"
+}
+
+function expect_in_msg() {
+ local WANTED="${1}"
+
+ if ! grep -q -- "${WANTED}" "${OUTPUT_FILE}"; then
+ echo "FAIL: '${WANTED}' not found in ${OUTPUT_FILE}" >&2
+ cat "${OUTPUT_FILE}" >&2
+ exit "${ksft_fail}"
+ fi
+}
+
+function expect_not_in_msg() {
+ local UNWANTED="${1}"
+
+ if grep -q -- "${UNWANTED}" "${OUTPUT_FILE}"; then
+ echo "FAIL: '${UNWANTED}' found in ${OUTPUT_FILE}" >&2
+ cat "${OUTPUT_FILE}" >&2
+ exit "${ksft_fail}"
+ fi
+}
+
+# Every write publishes a new payload and frees the previous one. An empty
+# value is skipped when the payload is formatted, so this also drives the
+# target through having no payload at all.
+function churn_value() {
+ local i
+
+ for i in $(seq "${ITERATIONS}")
+ do
+ echo "value${i}" > "${USERDATA_DIR}/${CHURN_KEY}/value"
+ echo > "${USERDATA_DIR}/${CHURN_KEY}/value"
+ done
+}
+
+# Create and delete a key underneath the sender
+function churn_key() {
+ local i
+
+ for i in $(seq "${ITERATIONS}")
+ do
+ mkdir "${USERDATA_DIR}/${TRANSIENT_KEY}"
+ echo "transient${i}" > "${USERDATA_DIR}/${TRANSIENT_KEY}/value"
+ rmdir "${USERDATA_DIR}/${TRANSIENT_KEY}"
+ done
+}
+
+# Keep the transmit path busy while the payload is being replaced
+function send_messages() {
+ local i
+
+ for i in $(seq "${ITERATIONS}")
+ do
+ echo "${MSG}: ${TARGET} ${i}" > /dev/kmsg
+ done
+}
+
+# Run the workers concurrently and fail if any of them hits an error
+function run_workers() {
+ local PIDS=()
+ local WORKER
+ local RET=0
+ local PID
+
+ for WORKER in "$@"
+ do
+ "${WORKER}" &
+ PIDS+=("$!")
+ done
+
+ # Reap every worker before reporting a failure, otherwise a surviving
+ # worker keeps writing to configfs while the exit trap cleans it up.
+ for PID in "${PIDS[@]}"
+ do
+ wait "${PID}" || RET=1
+ done
+
+ if [[ "${RET}" -ne 0 ]]
+ then
+ echo "FAIL: userdata torture worker failed" >&2
+ exit "${ksft_fail}"
+ fi
+}
+
+function create_bulk_keys() {
+ local i
+
+ for i in $(seq "${BULK_KEYS}")
+ do
+ write_key "bulk${i}" "${LONG_VALUE}"
+ done
+}
+
+function delete_bulk_keys() {
+ local i
+
+ for i in $(seq "${BULK_KEYS}")
+ do
+ rmdir "${USERDATA_DIR}/bulk${i}"
+ done
+}
+
+# ========== #
+# Start here #
+# ========== #
+
+modprobe netdevsim 2> /dev/null || true
+modprobe netconsole 2> /dev/null || true
+
+IP_VERSION="ipv4"
+# The content of kmsg will be saved to the following file
+OUTPUT_FILE="/tmp/${TARGET}"
+
+# Check for basic system dependency and exit if not found
+check_for_dependencies
+# Set current loglevel to KERN_INFO(6), and default to KERN_NOTICE(5)
+echo "6 5" > /proc/sys/kernel/printk
+# Remove the namespace, interfaces and netconsole target on exit
+trap cleanup EXIT
+# Create one namespace and two interfaces
+set_network "${IP_VERSION}"
+# Create a dynamic target for netconsole
+create_dynamic_target
+
+# ===================================================
+# TEST #1
+# A value written to configfs reaches the destination
+# ===================================================
+write_key "${USERDATA_KEY}" "first"
+send_and_capture
+expect_in_msg "${USERDATA_KEY}=first"
+
+# ===================================================
+# TEST #2
+# Updating the value replaces the previous payload
+# ===================================================
+write_key "${USERDATA_KEY}" "second"
+send_and_capture
+expect_in_msg "${USERDATA_KEY}=second"
+expect_not_in_msg "${USERDATA_KEY}=first"
+
+# ===================================================
+# TEST #3
+# Clearing the value drops the entry
+# ===================================================
+echo > "${USERDATA_DIR}/${USERDATA_KEY}/value"
+send_and_capture
+expect_not_in_msg "${USERDATA_KEY}="
+
+# ===================================================
+# TEST #4
+# Removing the key drops the entry
+# ===================================================
+write_key "${USERDATA_KEY}" "third"
+rmdir "${USERDATA_DIR}/${USERDATA_KEY}"
+send_and_capture
+expect_not_in_msg "${USERDATA_KEY}="
+rm "${OUTPUT_FILE}"
+
+# ===================================================
+# TEST #5
+# Torture the payload while messages are being sent,
+# first unfragmented and then fragmented
+# ===================================================
+write_key "${CHURN_KEY}" "${USERDATA_VALUE}"
+run_workers churn_value churn_key send_messages
+
+create_bulk_keys
+run_workers churn_value churn_key send_messages
+delete_bulk_keys
+
+exit "${ksft_pass}"
|
| 3/2 | 2026/08/05 12:19 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 6912 output: 29 thoughts: 307 Thoughts: **My Assessment of the Netconsole Patch** Okay, so I've got a patch here that's making some pretty significant changes to `netconsole`. Specifically, it's overhauling how the `userdata` is handled, and that's interesting because it touches core kernel functionality in `drivers/net/netconsole.c`. Looks like they're ditching the old `char *userdata` and `size_t userdata_length` for a `struct netcons_userdata` that's RCU-protected. Smart. This is a solid move to eliminate those nasty use-after-free and data race vulnerabilities – definitely a worthwhile improvement. The update and read operations are now using `rcu_replace_pointer()` and `kfree_rcu()`, and all the send functions (`send_msg_no_fragmentation()`, etc.) are taking `const struct netcons_userdata *userdata` and appropriately wrapping the payload access with `rcu_read_lock()` and `rcu_read_unlock()`. This is textbook RCU implementation. Given the scope and the core nature of this change, fuzzing is an absolute must-do. I'm going to want to make sure this is robust before it goes live. Time to figure out the minimal config to reproduce this and get to testing. I know `CONFIG_NETCONSOLE` is required, and I suspect `CONFIG_NETCONSOLE_DYNAMIC` will also be needed. Let me double-check `drivers/net/Kconfig` to be sure. |
| 4/2 | 2026/08/05 12:19 | tool | grepper |
0mArgs:{
"Expression": "config NETCONSOLE",
"PathPrefix": "drivers/net/Kconfig"
}Results: {
"Output": "drivers/net/Kconfig=318=config MACSEC\n--\ndrivers/net/Kconfig-326-\ndrivers/net/Kconfig:327:config NETCONSOLE\ndrivers/net/Kconfig-328-\ttristate \"Network console logging support\"\n--\ndrivers/net/Kconfig-333-\ndrivers/net/Kconfig:334:config NETCONSOLE_DYNAMIC\ndrivers/net/Kconfig-335-\tbool \"Dynamic reconfiguration of logging targets\"\n--\ndrivers/net/Kconfig-344-\ndrivers/net/Kconfig:345:config NETCONSOLE_EXTENDED_LOG\ndrivers/net/Kconfig-346-\tbool \"Set kernel extended message by default\"\n--\ndrivers/net/Kconfig-354-\ndrivers/net/Kconfig:355:config NETCONSOLE_PREPEND_RELEASE\ndrivers/net/Kconfig-356-\tbool \"Prepend kernel release version in the message by default\"\n"
} |
| 5/2 | 2026/08/05 12:19 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 7818 output: 29 thoughts: 9 Thoughts: Here's my thought process, summarized as you requested: **Assessing the Landscape: NETCONSOLE Dependencies** Okay, time to dig in. My initial thought is to immediately check the dependencies of NETCONSOLE. Before I start any troubleshooting or deeper analysis, understanding what NETCONSOLE relies on is absolutely crucial. I need to know the potential choke points, the other components whose failure would take NETCONSOLE down with them. A thorough understanding of these dependencies will give me a solid foundation for any further investigation. I'll need to identify not just the direct dependencies, but also the transitive ones – those components NETCONSOLE relies on, which in turn rely on *other* things. This is the first, essential step. |
| 6/2 | 2026/08/05 12:19 | tool | grepper |
0mArgs:{
"Expression": "depends on.*",
"PathPrefix": "drivers/net/Kconfig"
}Results: {
"Output": "drivers/net/Kconfig=6=menuconfig NETDEVICES\ndrivers/net/Kconfig-7-\tdefault y if UML\ndrivers/net/Kconfig:8:\tdepends on NET\ndrivers/net/Kconfig-9-\tbool \"Network device support\"\n--\ndrivers/net/Kconfig=41=config BONDING\ndrivers/net/Kconfig-42-\ttristate \"Bonding driver support\"\ndrivers/net/Kconfig:43:\tdepends on INET\ndrivers/net/Kconfig:44:\tdepends on TLS || TLS_DEVICE=n\ndrivers/net/Kconfig-45-\thelp\n--\ndrivers/net/Kconfig=74=config WIREGUARD\ndrivers/net/Kconfig-75-\ttristate \"WireGuard secure network tunnel\"\ndrivers/net/Kconfig:76:\tdepends on NET \u0026\u0026 INET\ndrivers/net/Kconfig-77-\tselect NET_UDP_TUNNEL\n--\ndrivers/net/Kconfig=92=config WIREGUARD_DEBUG\ndrivers/net/Kconfig-93-\tbool \"Debugging checks and verbose messages\"\ndrivers/net/Kconfig:94:\tdepends on WIREGUARD\ndrivers/net/Kconfig-95-\thelp\n--\ndrivers/net/Kconfig=103=config OVPN\ndrivers/net/Kconfig-104-\ttristate \"OpenVPN data channel offload\"\ndrivers/net/Kconfig:105:\tdepends on NET \u0026\u0026 INET\ndrivers/net/Kconfig-106-\tselect DST_CACHE\n--\ndrivers/net/Kconfig=136=config NET_FC\ndrivers/net/Kconfig-137-\tbool \"Fibre Channel driver support\"\ndrivers/net/Kconfig:138:\tdepends on SCSI \u0026\u0026 PCI\ndrivers/net/Kconfig-139-\thelp\n--\ndrivers/net/Kconfig=149=config IFB\ndrivers/net/Kconfig-150-\ttristate \"Intermediate Functional Block support\"\ndrivers/net/Kconfig:151:\tdepends on NET_ACT_MIRRED || NFT_FWD_NETDEV\ndrivers/net/Kconfig-152-\tselect NET_REDIRECT\n--\ndrivers/net/Kconfig=179=config MACVTAP\ndrivers/net/Kconfig-180-\ttristate \"MAC-VLAN based tap driver\"\ndrivers/net/Kconfig:181:\tdepends on MACVLAN\ndrivers/net/Kconfig:182:\tdepends on INET\ndrivers/net/Kconfig-183-\tselect TAP\n--\ndrivers/net/Kconfig=193=config IPVLAN_L3S\ndrivers/net/Kconfig:194:\tdepends on NETFILTER\ndrivers/net/Kconfig:195:\tdepends on IPVLAN\ndrivers/net/Kconfig-196-\tdef_bool y\n--\ndrivers/net/Kconfig=199=config IPVLAN\ndrivers/net/Kconfig-200-\ttristate \"IP-VLAN support\"\ndrivers/net/Kconfig:201:\tdepends on INET\ndrivers/net/Kconfig-202-\thelp\n--\ndrivers/net/Kconfig=216=config IPVTAP\ndrivers/net/Kconfig-217-\ttristate \"IP-VLAN based tap driver\"\ndrivers/net/Kconfig:218:\tdepends on IPVLAN\ndrivers/net/Kconfig:219:\tdepends on INET\ndrivers/net/Kconfig-220-\tselect TAP\n--\ndrivers/net/Kconfig=230=config VXLAN\ndrivers/net/Kconfig-231-\ttristate \"Virtual eXtensible Local Area Network (VXLAN)\"\ndrivers/net/Kconfig:232:\tdepends on INET\ndrivers/net/Kconfig-233-\tselect NET_UDP_TUNNEL\n--\ndrivers/net/Kconfig=245=config GENEVE\ndrivers/net/Kconfig-246-\ttristate \"Generic Network Virtualization Encapsulation\"\ndrivers/net/Kconfig:247:\tdepends on INET\ndrivers/net/Kconfig-248-\tselect NET_UDP_TUNNEL\n--\ndrivers/net/Kconfig=260=config BAREUDP\ndrivers/net/Kconfig-261-\ttristate \"Bare UDP Encapsulation\"\ndrivers/net/Kconfig:262:\tdepends on INET\ndrivers/net/Kconfig-263-\tselect NET_UDP_TUNNEL\n--\ndrivers/net/Kconfig=272=config GTP\ndrivers/net/Kconfig-273-\ttristate \"GPRS Tunneling Protocol datapath (GTP-U)\"\ndrivers/net/Kconfig:274:\tdepends on INET\ndrivers/net/Kconfig-275-\tselect NET_UDP_TUNNEL\n--\ndrivers/net/Kconfig=289=config PFCP\ndrivers/net/Kconfig-290-\ttristate \"Packet Forwarding Control Protocol (PFCP)\"\ndrivers/net/Kconfig:291:\tdepends on INET\ndrivers/net/Kconfig-292-\tselect NET_UDP_TUNNEL\n--\ndrivers/net/Kconfig=302=config AMT\ndrivers/net/Kconfig-303-\ttristate \"Automatic Multicast Tunneling (AMT)\"\ndrivers/net/Kconfig:304:\tdepends on INET \u0026\u0026 IP_MULTICAST\ndrivers/net/Kconfig-305-\tselect NET_UDP_TUNNEL\n--\ndrivers/net/Kconfig=327=config NETCONSOLE\ndrivers/net/Kconfig-328-\ttristate \"Network console logging support\"\ndrivers/net/Kconfig:329:\tdepends on PRINTK\ndrivers/net/Kconfig-330-\thelp\n--\ndrivers/net/Kconfig=334=config NETCONSOLE_DYNAMIC\ndrivers/net/Kconfig-335-\tbool \"Dynamic reconfiguration of logging targets\"\ndrivers/net/Kconfig:336:\tdepends on NETCONSOLE \u0026\u0026 SYSFS \u0026\u0026 CONFIGFS_FS \u0026\u0026 \\\ndrivers/net/Kconfig-337-\t\t\t!(NETCONSOLE=y \u0026\u0026 CONFIGFS_FS=m)\n--\ndrivers/net/Kconfig=345=config NETCONSOLE_EXTENDED_LOG\ndrivers/net/Kconfig-346-\tbool \"Set kernel extended message by default\"\ndrivers/net/Kconfig:347:\tdepends on NETCONSOLE\ndrivers/net/Kconfig-348-\tdefault n\n--\ndrivers/net/Kconfig=355=config NETCONSOLE_PREPEND_RELEASE\ndrivers/net/Kconfig-356-\tbool \"Prepend kernel release version in the message by default\"\ndrivers/net/Kconfig:357:\tdepends on NETCONSOLE_EXTENDED_LOG\ndrivers/net/Kconfig-358-\tdefault n\n--\ndrivers/net/Kconfig=373=config NTB_NETDEV\ndrivers/net/Kconfig-374-\ttristate \"Virtual Ethernet over NTB Transport\"\ndrivers/net/Kconfig:375:\tdepends on NTB_TRANSPORT\ndrivers/net/Kconfig-376-\ndrivers/net/Kconfig=377=config RIONET\ndrivers/net/Kconfig-378-\ttristate \"RapidIO Ethernet over messaging driver support\"\ndrivers/net/Kconfig:379:\tdepends on RAPIDIO\ndrivers/net/Kconfig-380-\ndrivers/net/Kconfig=381=config RIONET_TX_SIZE\ndrivers/net/Kconfig-382-\tint \"Number of outbound queue entries\"\ndrivers/net/Kconfig:383:\tdepends on RIONET\ndrivers/net/Kconfig-384-\tdefault \"128\"\n--\ndrivers/net/Kconfig=386=config RIONET_RX_SIZE\ndrivers/net/Kconfig-387-\tint \"Number of inbound queue entries\"\ndrivers/net/Kconfig:388:\tdepends on RIONET\ndrivers/net/Kconfig-389-\tdefault \"128\"\n--\ndrivers/net/Kconfig=391=config TUN\ndrivers/net/Kconfig-392-\ttristate \"Universal TUN/TAP device driver support\"\ndrivers/net/Kconfig:393:\tdepends on INET\ndrivers/net/Kconfig-394-\tselect CRC32\n--\ndrivers/net/Kconfig=443=config VIRTIO_NET\ndrivers/net/Kconfig-444-\ttristate \"Virtio network driver\"\ndrivers/net/Kconfig:445:\tdepends on VIRTIO\ndrivers/net/Kconfig-446-\tselect NET_FAILOVER\n--\ndrivers/net/Kconfig=463=config NETKIT\ndrivers/net/Kconfig-464-\tbool \"BPF-programmable network device\"\ndrivers/net/Kconfig:465:\tdepends on BPF_SYSCALL\ndrivers/net/Kconfig-466-\thelp\n--\ndrivers/net/Kconfig=472=config NET_VRF\ndrivers/net/Kconfig-473-\ttristate \"Virtual Routing and Forwarding (Lite)\"\ndrivers/net/Kconfig:474:\tdepends on IP_MULTIPLE_TABLES\ndrivers/net/Kconfig:475:\tdepends on NET_L3_MASTER_DEV\ndrivers/net/Kconfig:476:\tdepends on IPV6_MULTIPLE_TABLES || IPV6=n\ndrivers/net/Kconfig-477-\thelp\n--\ndrivers/net/Kconfig=481=config VSOCKMON\ndrivers/net/Kconfig-482-\ttristate \"Virtual vsock monitoring device\"\ndrivers/net/Kconfig:483:\tdepends on VHOST_VSOCK\ndrivers/net/Kconfig-484-\thelp\n--\ndrivers/net/Kconfig=489=config MHI_NET\ndrivers/net/Kconfig-490-\ttristate \"MHI network driver\"\ndrivers/net/Kconfig:491:\tdepends on MHI_BUS\ndrivers/net/Kconfig-492-\thelp\n--\ndrivers/net/Kconfig=544=config XEN_NETDEV_FRONTEND\ndrivers/net/Kconfig-545-\ttristate \"Xen network device frontend driver\"\ndrivers/net/Kconfig:546:\tdepends on XEN\ndrivers/net/Kconfig-547-\tselect XEN_XENBUS_FRONTEND\n--\ndrivers/net/Kconfig=562=config XEN_NETDEV_BACKEND\ndrivers/net/Kconfig-563-\ttristate \"Xen backend network device\"\ndrivers/net/Kconfig:564:\tdepends on XEN_BACKEND\ndrivers/net/Kconfig-565-\thelp\n--\ndrivers/net/Kconfig=584=config VMXNET3\ndrivers/net/Kconfig-585-\ttristate \"VMware VMXNET3 ethernet driver\"\ndrivers/net/Kconfig:586:\tdepends on PCI \u0026\u0026 INET\ndrivers/net/Kconfig:587:\tdepends on PAGE_SIZE_LESS_THAN_64KB\ndrivers/net/Kconfig-588-\tselect PAGE_POOL\n--\ndrivers/net/Kconfig=594=config FUJITSU_ES\ndrivers/net/Kconfig-595-\ttristate \"FUJITSU Extended Socket Network Device driver\"\ndrivers/net/Kconfig:596:\tdepends on ACPI\ndrivers/net/Kconfig-597-\thelp\n--\ndrivers/net/Kconfig=604=config NETDEVSIM\ndrivers/net/Kconfig-605-\ttristate \"Simulated networking device\"\ndrivers/net/Kconfig:606:\tdepends on DEBUG_FS\ndrivers/net/Kconfig:607:\tdepends on INET\ndrivers/net/Kconfig:608:\tdepends on PSAMPLE || PSAMPLE=n\ndrivers/net/Kconfig:609:\tdepends on PTP_1588_CLOCK_MOCK || PTP_1588_CLOCK_MOCK=n\ndrivers/net/Kconfig-610-\tselect NET_DEVLINK\n"
} |
| 7/2 | 2026/08/05 12:19 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11011 output: 31 thoughts: 156 Thoughts: **My Analysis of the Netconsole Configuration** Alright, let's break this down. It seems we're dealing with `NETCONSOLE` here, and I need to figure out the right configuration options. First off, it's pretty clear that `NETCONSOLE` relies on `PRINTK`, which makes sense for logging purposes. Now, `NETCONSOLE_DYNAMIC` brings in a more advanced configuration, and that one has a dependency on `NETCONSOLE` itself, plus `SYSFS` and `CONFIGFS_FS`. Right, so to get the functionality we need, I'm thinking we should enable `NETCONSOLE`, `NETCONSOLE_DYNAMIC`, and, because of the latter's dependency, also `CONFIGFS_FS`. That covers the basic setup, including the dynamic aspect. Now to get deeper into the specifics of the actual changes, I want to identify the core symbols being modified within this patch. Let me see... the modified functions are: `update_userdata`, `netconsole_target_release`, `send_msg_no_fragmentation`, `send_fragmented_body`, `send_msg_fragmented`, `send_ext_msg_udp`, `send_msg_udp`, and `free_param_target`. Okay, it seems that `update_userdata` is a static function. I need to understand this better. I'll need to figure out exactly where that is called and how the changes are implemented to truly understand their impact. |
| 8/2 | 2026/08/05 12:19 | tool | grepper |
0mArgs:{
"Expression": "update_userdata",
"PathPrefix": "drivers/net/netconsole.c"
}Results: {
"Output": "drivers/net/netconsole.c=1054=static int calc_userdata_len(struct netconsole_target *nt)\n--\ndrivers/net/netconsole.c-1072-\ndrivers/net/netconsole.c:1073:static int update_userdata(struct netconsole_target *nt)\ndrivers/net/netconsole.c-1074-{\n--\ndrivers/net/netconsole.c=1121=static ssize_t userdatum_value_store(struct config_item *item, const char *buf,\n--\ndrivers/net/netconsole.c-1134-\tdynamic_netconsole_mutex_lock();\ndrivers/net/netconsole.c:1135:\t/* Snapshot for rollback if update_userdata() fails below */\ndrivers/net/netconsole.c-1136-\tstrscpy(old_value, udm-\u003evalue, sizeof(old_value));\n--\ndrivers/net/netconsole.c-1142-\tnt = userdata_to_target(ud);\ndrivers/net/netconsole.c:1143:\tret = update_userdata(nt);\ndrivers/net/netconsole.c-1144-\tif (ret \u003c 0) {\n--\ndrivers/net/netconsole.c=1337=static void userdatum_drop(struct config_group *group, struct config_item *item)\n--\ndrivers/net/netconsole.c-1345-\tdynamic_netconsole_mutex_lock();\ndrivers/net/netconsole.c:1346:\tupdate_userdata(nt);\ndrivers/net/netconsole.c-1347-\tconfig_item_put(item);\n"
} |
| 9/2 | 2026/08/05 12:19 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11930 output: 34 thoughts: 40 Thoughts: Okay, let's see, I'm thinking about `update_userdata`. Ah, yes, that's called from both `userdatum_value_store` and `userdatum_drop`. Now, those ring a bell... right, those are configfs callbacks. So, I need to understand this better. My next step is clear: I need to take a closer look at these configfs callbacks and understand how `update_userdata` is used within their context. Let's dig into the configfs code. |
| 10/2 | 2026/08/05 12:19 | tool | grepper |
0mArgs:{
"Expression": "userdatum_value_store",
"PathPrefix": "drivers/net/netconsole.c"
}Results: {
"Output": "drivers/net/netconsole.c=1073=static int update_userdata(struct netconsole_target *nt)\n--\ndrivers/net/netconsole.c-1120-\ndrivers/net/netconsole.c:1121:static ssize_t userdatum_value_store(struct config_item *item, const char *buf,\ndrivers/net/netconsole.c-1122-\t\t\t\t size_t count)\n"
} |
| 11/2 | 2026/08/05 12:19 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12231 output: 34 thoughts: 16 Thoughts: Here's my thought process, as requested: **Navigating the Codebase: The `userdatum_value_store` Conundrum** Alright, let's dive in. My immediate thought is, "Where exactly is this `userdatum_value_store` being leveraged?" This isn't just a generic variable name; it suggests a specific function or data structure tied to user data and its persistent values. Given that it's probably being used *somewhere*, I need to figure out the scope of its interactions. Understanding its usage is key to its design, interactions, and any potential modifications. The next step is to initiate a search and trace all instances to get a comprehensive view of how it operates within the system. Let's start with a thorough search. |
| 12/2 | 2026/08/05 12:20 | tool | grepper |
0mArgs:{
"Expression": "userdatum_value_store",
"PathPrefix": "drivers/net/netconsole.c"
}Results: {
"Output": "drivers/net/netconsole.c=1073=static int update_userdata(struct netconsole_target *nt)\n--\ndrivers/net/netconsole.c-1120-\ndrivers/net/netconsole.c:1121:static ssize_t userdatum_value_store(struct config_item *item, const char *buf,\ndrivers/net/netconsole.c-1122-\t\t\t\t size_t count)\n"
} |
| 13/2 | 2026/08/05 12:20 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12561 output: 34 thoughts: 19 Thoughts: Okay, here's my summary, expressed in the first person, as if these were my immediate thoughts: **Locating the Target** Alright, let's get down to it. Time to locate that specific variable or module, the `userdatum_value_store`. I know it's in this file somewhere, and I need to find all instances. So, I need to start with a broad, thorough search. I'll make sure to use a comprehensive search function to scour the entire document. This could be a crucial part of whatever process I'm working on right now. Got to make sure I don't miss anything. |
| 14/2 | 2026/08/05 12:20 | tool | grepper |
0mArgs:{
"Expression": "userdatum_value_store",
"PathPrefix": "drivers/net/netconsole.c"
}Results: {
"Output": "drivers/net/netconsole.c=1073=static int update_userdata(struct netconsole_target *nt)\n--\ndrivers/net/netconsole.c-1120-\ndrivers/net/netconsole.c:1121:static ssize_t userdatum_value_store(struct config_item *item, const char *buf,\ndrivers/net/netconsole.c-1122-\t\t\t\t size_t count)\n"
} |
| 15/2 | 2026/08/05 12:20 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12867 output: 37 thoughts: 25 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **Unused Definition Check** Hold on a second... this variable/function/whatever is *defined* but not actually *used*? That's a classic red flag. Could be dead code, a potential source of confusion, or even a subtle bug waiting to happen if it's unintentionally interacting with something else. I need to get a handle on this. Let's immediately jump to that section of the file. Line 1121 is the likely place to start looking. I need to understand the immediate context. I'll need to examine the surrounding lines to understand why it's there. My gut tells me this needs investigating. |
| 16/2 | 2026/08/05 12:20 | tool | read-file |
0mArgs:{
"File": "drivers/net/netconsole.c",
"FirstLine": 1120,
"LineCount": 50
}Results: {
"Contents": "1120:\t\n1121:\tstatic ssize_t userdatum_value_store(struct config_item *item, const char *buf,\n1122:\t\t\t\t\t size_t count)\n1123:\t{\n1124:\t\tstruct userdatum *udm = to_userdatum(item);\n1125:\t\tchar old_value[MAX_EXTRADATA_VALUE_LEN];\n1126:\t\tstruct netconsole_target *nt;\n1127:\t\tstruct userdata *ud;\n1128:\t\tssize_t ret;\n1129:\t\n1130:\t\tif (count \u003e= MAX_EXTRADATA_VALUE_LEN)\n1131:\t\t\treturn -EMSGSIZE;\n1132:\t\n1133:\t\tmutex_lock(\u0026netconsole_subsys.su_mutex);\n1134:\t\tdynamic_netconsole_mutex_lock();\n1135:\t\t/* Snapshot for rollback if update_userdata() fails below */\n1136:\t\tstrscpy(old_value, udm-\u003evalue, sizeof(old_value));\n1137:\t\t/* count is bounded above, so strscpy() cannot truncate here */\n1138:\t\tstrscpy(udm-\u003evalue, buf, sizeof(udm-\u003evalue));\n1139:\t\ttrim_newline(udm-\u003evalue, sizeof(udm-\u003evalue));\n1140:\t\n1141:\t\tud = to_userdata(item-\u003eci_parent);\n1142:\t\tnt = userdata_to_target(ud);\n1143:\t\tret = update_userdata(nt);\n1144:\t\tif (ret \u003c 0) {\n1145:\t\t\t/* Restore the previous value so it matches the live payload */\n1146:\t\t\tstrscpy(udm-\u003evalue, old_value, sizeof(udm-\u003evalue));\n1147:\t\t\tgoto out_unlock;\n1148:\t\t}\n1149:\t\tret = count;\n1150:\tout_unlock:\n1151:\t\tdynamic_netconsole_mutex_unlock();\n1152:\t\tmutex_unlock(\u0026netconsole_subsys.su_mutex);\n1153:\t\treturn ret;\n1154:\t}\n1155:\t\n1156:\t/* disable_sysdata_feature - Disable sysdata feature and clean sysdata\n1157:\t * @nt: target that is disabling the feature\n1158:\t * @feature: feature being disabled\n1159:\t */\n1160:\tstatic void disable_sysdata_feature(struct netconsole_target *nt,\n1161:\t\t\t\t\t enum sysdata_feature feature)\n1162:\t{\n1163:\t\tnt-\u003esysdata_fields \u0026= ~feature;\n1164:\t\tnt-\u003esysdata[0] = 0;\n1165:\t}\n1166:\t\n1167:\tstatic ssize_t sysdata_msgid_enabled_store(struct config_item *item,\n1168:\t\t\t\t\t\t const char *buf, size_t count)\n1169:\t{\n"
} |
| 17/2 | 2026/08/05 12:20 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 13872 output: 35 thoughts: 37 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person: **Navigating the `userdatum_value_store` Conundrum** Right, a flicker of memory – that `userdatum_value_store`. It's nagging at me, suggesting it's likely *involved* in a macro definition. My gut feeling is that it isn't being used directly. That suggests I should try to trace its usage. I should broaden my search. Rather than get lost in the function calls, I should look more broadly for uses of the structure. I'll need to expand my search terms. I'll start with a broader scope search for `userdatum_value`. I'll also try a broader scope search for `CONFIGFS_ATTR`. It's a hunch, but something like that feels right. I'm betting that one of these will lead me to the macro definition that's using the storage in an indirect way. Time to fire up the grep and see what comes back. |
| 18/2 | 2026/08/05 12:20 | tool | grepper |
0mArgs:{
"Expression": "CONFIGFS_ATTR.*userdatum",
"PathPrefix": "drivers/net/netconsole.c"
}Results: {
"Output": "drivers/net/netconsole.c=1255=static ssize_t sysdata_cpu_nr_enabled_store(struct config_item *item,\n--\ndrivers/net/netconsole.c-1287-\ndrivers/net/netconsole.c:1288:CONFIGFS_ATTR(userdatum_, value);\ndrivers/net/netconsole.c-1289-CONFIGFS_ATTR(sysdata_, cpu_nr_enabled);\n"
} |
| 19/2 | 2026/08/05 12:20 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 14284 output: 35 thoughts: 161 Thoughts: **My Analysis of the Code's Data Flow** Okay, so I'm looking at this `CONFIGFS_ATTR(userdatum_, value)` macro, and it clearly expands to create two functions: `userdatum_value_store` and `userdatum_value_show`. My brain immediately jumps to the entry points, which are thus `userdatum_value_store` and `userdatum_drop`. I also see that `send_ext_msg_udp` and `send_msg_udp` are key players here. Hmm, wait a second. I know that `send_ext_msg_udp` and `send_msg_udp` are invoked by `write_ext_msg` and `write_msg` respectively, which are themselves called by `netconsole_write`. That's a good connection to make. Let's see... I need to figure out the context of `netconsole_write`. Ah, right, it's a console write callback. Hold on... I'm missing something, `send_ext_msg_udp` is actually called by the `netconsole_ext_write` function. This makes the connections much more clear. |
| 20/2 | 2026/08/05 12:20 | tool | grepper |
0mArgs:{
"Expression": "send_ext_msg_udp",
"PathPrefix": "drivers/net/netconsole.c"
}Results: {
"Output": "drivers/net/netconsole.c=2073=static void send_msg_fragmented(struct netconsole_target *nt,\n--\ndrivers/net/netconsole.c-2110-/**\ndrivers/net/netconsole.c:2111: * send_ext_msg_udp - send extended log message to target\ndrivers/net/netconsole.c-2112- * @nt: target to send message to\n--\ndrivers/net/netconsole.c-2118- */\ndrivers/net/netconsole.c:2119:static void send_ext_msg_udp(struct netconsole_target *nt,\ndrivers/net/netconsole.c-2120-\t\t\t struct nbcon_write_context *wctxt)\n--\ndrivers/net/netconsole.c=2172=static void netconsole_write(struct nbcon_write_context *wctxt, bool extended)\n--\ndrivers/net/netconsole.c-2191-\t\tif (extended)\ndrivers/net/netconsole.c:2192:\t\t\tsend_ext_msg_udp(nt, wctxt);\ndrivers/net/netconsole.c-2193-\t\telse\n"
} |
| 21/2 | 2026/08/05 12:20 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 15034 output: 32 thoughts: 48 Thoughts: Here's my analysis of the provided information, as if these were my internal thoughts: **Dissecting Kernel Entry Points** Okay, so I'm looking at how data gets into and out of the kernel's various subsystems. Let's see... the `netconsole_write` function is definitely the starting point for writing to the console. That makes sense, pretty straightforward. It's the gatekeeper, handling the initial call to get data onto the screen or into a log, based on how the system is set up. Now, I see `userdatum_value_store` as another entry point, this time for configfs. Right, this would be how user-provided data is actually stored within the configfs structures – the main mechanism to handle configuration input. That implies it's the interface used to write configuration data. Ah, and I see `userdatum_drop` also mentioned as an entry point. That’s probably the important entry point that is used to remove or cleanup this user data. I'll need to look at the interactions between these to see how everything is managed, from getting data in, to storing it and finally, cleaning it up. Understanding these entry points is key to understanding the data flow and how the kernel handles these critical operations. |
| 22/2 | 2026/08/05 12:20 | tool | grepper |
0mArgs:{
"Expression": "userdatum_drop",
"PathPrefix": "drivers/net/netconsole.c"
}Results: {
"Output": "drivers/net/netconsole.c=1314=static struct config_item *userdatum_make_item(struct config_group *group,\n--\ndrivers/net/netconsole.c-1336-\ndrivers/net/netconsole.c:1337:static void userdatum_drop(struct config_group *group, struct config_item *item)\ndrivers/net/netconsole.c-1338-{\n--\ndrivers/net/netconsole.c=1359=static const struct configfs_group_operations userdata_ops = {\ndrivers/net/netconsole.c-1360-\t.make_item\t\t= userdatum_make_item,\ndrivers/net/netconsole.c:1361:\t.drop_item\t\t= userdatum_drop,\ndrivers/net/netconsole.c-1362-};\n"
} |
| 23/2 | 2026/08/05 12:20 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 15600 output: 65 thoughts: 204 Thoughts: **Analyzing Hot-Path Symbols in Netconsole Modifications** Okay, so I'm thinking we need to zero in on the relevant symbols for this netconsole work. My initial gut feeling is that the key ones should be `userdatum_value_store`, `userdatum_drop`, and `netconsole_write`. But hold on... isn't `netconsole_write` a pretty generic hot-path function? It's the console write callback, and it could be hit really, really often if there's a flood of `printks`. However, the other two, `userdatum_value_store` and `userdatum_drop`, are much more directly tied to *this* specific feature. Now, I really should double-check how frequently `netconsole_write` is actually being called. Ah, right, it gets fired for every single `printk` when netconsole is enabled, that makes sense. However, the patch itself seems to be digging into `send_ext_msg_udp`, `send_msg_fragmented`, `send_msg_no_fragmentation`, and `send_fragmented_body`. Those are all static functions, which is important to consider. Is there any non-static function exposed in the netconsole code? I should quickly check `drivers/net/netconsole.c` to see if there are any non-static functions defined there. Gotta cover my bases. |
| 24/2 | 2026/08/05 12:20 | tool | grepper |
0mArgs:{
"Expression": "^[a-zA-Z_][a-zA-Z0-9_]* [a-zA-Z_][a-zA-Z0-9_]*\\(",
"PathPrefix": "drivers/net/netconsole.c"
}Results: {
"Output": "drivers/net/netconsole.c=80=__setup(\"netconsole=\", option_setup);\n--\ndrivers/net/netconsole.c-83-/* Linked list of all configured targets */\ndrivers/net/netconsole.c:84:static LIST_HEAD(target_list);\ndrivers/net/netconsole.c-85-/* target_cleanup_list is used to track targets that need to be cleaned outside\n--\ndrivers/net/netconsole.c-88- */\ndrivers/net/netconsole.c:89:static LIST_HEAD(target_cleanup_list);\ndrivers/net/netconsole.c-90-\ndrivers/net/netconsole.c-91-/* This needs to be a spinlock because write_msg() cannot sleep */\ndrivers/net/netconsole.c:92:static DEFINE_SPINLOCK(target_list_lock);\ndrivers/net/netconsole.c-93-/* This needs to be a mutex because netpoll_cleanup might sleep */\ndrivers/net/netconsole.c:94:static DEFINE_MUTEX(target_cleanup_list_lock);\ndrivers/net/netconsole.c-95-\n--\ndrivers/net/netconsole.c=215=static struct configfs_subsystem netconsole_subsys;\ndrivers/net/netconsole.c:216:static DEFINE_MUTEX(dynamic_netconsole_mutex);\ndrivers/net/netconsole.c-217-\n"
} |
| 25/2 | 2026/08/05 12:20 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 16526 output: 31 thoughts: 16 Thoughts: Here's my attempt at summarizing the thought process in the first person, assuming the user is an expert: **Regex Snafu: Time for the File** Ugh, wait a second. That regex I just crafted… something feels off. I'm starting to have doubts. The edge cases are starting to swim up in my mental model, and I suspect it's not going to be as robust as I'd initially hoped. Alright, forget the regex for now. It's time to take a step back and get a more grounded perspective. Let's just look at the raw data in the file itself. That's always the best first step when a pattern matching strategy feels shaky. I'll get a clearer understanding of the data this way, and I can always go back and refine the regex based on actual observations, but I should probably start here. |
| 26/2 | 2026/08/05 12:20 | tool | grepper |
0mArgs:{
"Expression": "^static ",
"PathPrefix": "drivers/net/netconsole.c"
}Results: {
"Output": "\nFull output is too long, showing 500 out of 520 lines.\nUse more precise expression if possible.\n\ndrivers/net/netconsole.c=53=MODULE_IMPORT_NS(\"NETDEV_INTERNAL\");\n--\ndrivers/net/netconsole.c-63-\ndrivers/net/netconsole.c:64:static char config[MAX_PARAM_LENGTH];\ndrivers/net/netconsole.c-65-module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0);\ndrivers/net/netconsole.c=66=MODULE_PARM_DESC(netconsole, \" netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@\u003ctgt-ip\u003e/[tgt-macaddr]\");\ndrivers/net/netconsole.c-67-\ndrivers/net/netconsole.c:68:static bool oops_only;\ndrivers/net/netconsole.c-69-module_param(oops_only, bool, 0600);\ndrivers/net/netconsole.c=70=MODULE_PARM_DESC(oops_only, \"Only log oops messages\");\n--\ndrivers/net/netconsole.c-74-#ifndef\tMODULE\ndrivers/net/netconsole.c:75:static int __init option_setup(char *opt)\ndrivers/net/netconsole.c-76-{\n--\ndrivers/net/netconsole.c=80=__setup(\"netconsole=\", option_setup);\n--\ndrivers/net/netconsole.c-83-/* Linked list of all configured targets */\ndrivers/net/netconsole.c:84:static LIST_HEAD(target_list);\ndrivers/net/netconsole.c-85-/* target_cleanup_list is used to track targets that need to be cleaned outside\n--\ndrivers/net/netconsole.c-88- */\ndrivers/net/netconsole.c:89:static LIST_HEAD(target_cleanup_list);\ndrivers/net/netconsole.c-90-\ndrivers/net/netconsole.c-91-/* This needs to be a spinlock because write_msg() cannot sleep */\ndrivers/net/netconsole.c:92:static DEFINE_SPINLOCK(target_list_lock);\ndrivers/net/netconsole.c-93-/* This needs to be a mutex because netpoll_cleanup might sleep */\ndrivers/net/netconsole.c:94:static DEFINE_MUTEX(target_cleanup_list_lock);\ndrivers/net/netconsole.c-95-\ndrivers/net/netconsole.c:96:static struct workqueue_struct *netconsole_wq;\ndrivers/net/netconsole.c-97-\n--\ndrivers/net/netconsole.c-101- */\ndrivers/net/netconsole.c:102:static struct console netconsole_ext, netconsole;\ndrivers/net/netconsole.c-103-\n--\ndrivers/net/netconsole.c=188=struct netconsole_target {\n--\ndrivers/net/netconsole.c-214-\ndrivers/net/netconsole.c:215:static struct configfs_subsystem netconsole_subsys;\ndrivers/net/netconsole.c:216:static DEFINE_MUTEX(dynamic_netconsole_mutex);\ndrivers/net/netconsole.c-217-\ndrivers/net/netconsole.c:218:static int __init dynamic_netconsole_init(void)\ndrivers/net/netconsole.c-219-{\n--\ndrivers/net/netconsole.c-224-\ndrivers/net/netconsole.c:225:static void __exit dynamic_netconsole_exit(void)\ndrivers/net/netconsole.c-226-{\n--\ndrivers/net/netconsole.c-234- */\ndrivers/net/netconsole.c:235:static void netconsole_target_get(struct netconsole_target *nt)\ndrivers/net/netconsole.c-236-{\n--\ndrivers/net/netconsole.c-240-\ndrivers/net/netconsole.c:241:static void netconsole_target_put(struct netconsole_target *nt)\ndrivers/net/netconsole.c-242-{\n--\ndrivers/net/netconsole.c-246-\ndrivers/net/netconsole.c:247:static void dynamic_netconsole_mutex_lock(void)\ndrivers/net/netconsole.c-248-{\n--\ndrivers/net/netconsole.c-251-\ndrivers/net/netconsole.c:252:static void dynamic_netconsole_mutex_unlock(void)\ndrivers/net/netconsole.c-253-{\n--\ndrivers/net/netconsole.c-258-\ndrivers/net/netconsole.c:259:static int __init dynamic_netconsole_init(void)\ndrivers/net/netconsole.c-260-{\n--\ndrivers/net/netconsole.c-263-\ndrivers/net/netconsole.c:264:static void __exit dynamic_netconsole_exit(void)\ndrivers/net/netconsole.c-265-{\n--\ndrivers/net/netconsole.c-271- */\ndrivers/net/netconsole.c:272:static void netconsole_target_get(struct netconsole_target *nt)\ndrivers/net/netconsole.c-273-{\n--\ndrivers/net/netconsole.c-275-\ndrivers/net/netconsole.c:276:static void netconsole_target_put(struct netconsole_target *nt)\ndrivers/net/netconsole.c-277-{\n--\ndrivers/net/netconsole.c-279-\ndrivers/net/netconsole.c:280:static void populate_configfs_item(struct netconsole_target *nt,\ndrivers/net/netconsole.c-281-\t\t\t\t int cmdline_count)\n--\ndrivers/net/netconsole.c-284-\ndrivers/net/netconsole.c:285:static void dynamic_netconsole_mutex_lock(void)\ndrivers/net/netconsole.c-286-{\n--\ndrivers/net/netconsole.c-288-\ndrivers/net/netconsole.c:289:static void dynamic_netconsole_mutex_unlock(void)\ndrivers/net/netconsole.c-290-{\n--\ndrivers/net/netconsole.c-295-/* Check if the target was bound by mac address. */\ndrivers/net/netconsole.c:296:static bool bound_by_mac(struct netconsole_target *nt)\ndrivers/net/netconsole.c-297-{\n--\ndrivers/net/netconsole.c-300-\ndrivers/net/netconsole.c:301:static void netcons_release_dev(struct netconsole_target *nt)\ndrivers/net/netconsole.c-302-{\n--\ndrivers/net/netconsole.c-308-/* Attempts to resume logging to a deactivated target. */\ndrivers/net/netconsole.c:309:static void resume_target(struct netconsole_target *nt)\ndrivers/net/netconsole.c-310-{\n--\ndrivers/net/netconsole.c-321-/* Checks if a deactivated target matches a device. */\ndrivers/net/netconsole.c:322:static bool deactivated_target_match(struct netconsole_target *nt,\ndrivers/net/netconsole.c-323-\t\t\t\t struct net_device *ndev)\n--\ndrivers/net/netconsole.c-333-/* Process work scheduled for target resume. */\ndrivers/net/netconsole.c:334:static void process_resume_target(struct work_struct *work)\ndrivers/net/netconsole.c-335-{\n--\ndrivers/net/netconsole.c-393- */\ndrivers/net/netconsole.c:394:static struct netconsole_target *alloc_and_init(void)\ndrivers/net/netconsole.c-395-{\n--\ndrivers/net/netconsole.c-420- */\ndrivers/net/netconsole.c:421:static void netconsole_process_cleanups_core(void)\ndrivers/net/netconsole.c-422-{\n--\ndrivers/net/netconsole.c-444-\ndrivers/net/netconsole.c:445:static void netconsole_print_banner(struct netpoll *np)\ndrivers/net/netconsole.c-446-{\n--\ndrivers/net/netconsole.c-464- */\ndrivers/net/netconsole.c:465:static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr)\ndrivers/net/netconsole.c-466-{\n--\ndrivers/net/netconsole.c-514-\ndrivers/net/netconsole.c:515:static struct netconsole_target *to_target(struct config_item *item)\ndrivers/net/netconsole.c-516-{\n--\ndrivers/net/netconsole.c-528- */\ndrivers/net/netconsole.c:529:static void netconsole_process_cleanups(void)\ndrivers/net/netconsole.c-530-{\n--\ndrivers/net/netconsole.c-539-/* Get rid of possible trailing newline, returning the new length */\ndrivers/net/netconsole.c:540:static void trim_newline(char *s, size_t maxlen)\ndrivers/net/netconsole.c-541-{\n--\ndrivers/net/netconsole.c-554-\ndrivers/net/netconsole.c:555:static ssize_t enabled_show(struct config_item *item, char *buf)\ndrivers/net/netconsole.c-556-{\n--\ndrivers/net/netconsole.c-559-\ndrivers/net/netconsole.c:560:static ssize_t extended_show(struct config_item *item, char *buf)\ndrivers/net/netconsole.c-561-{\n--\ndrivers/net/netconsole.c-564-\ndrivers/net/netconsole.c:565:static ssize_t release_show(struct config_item *item, char *buf)\ndrivers/net/netconsole.c-566-{\n--\ndrivers/net/netconsole.c-569-\ndrivers/net/netconsole.c:570:static ssize_t dev_name_show(struct config_item *item, char *buf)\ndrivers/net/netconsole.c-571-{\n--\ndrivers/net/netconsole.c-574-\ndrivers/net/netconsole.c:575:static ssize_t local_port_show(struct config_item *item, char *buf)\ndrivers/net/netconsole.c-576-{\n--\ndrivers/net/netconsole.c-579-\ndrivers/net/netconsole.c:580:static ssize_t remote_port_show(struct config_item *item, char *buf)\ndrivers/net/netconsole.c-581-{\n--\ndrivers/net/netconsole.c-584-\ndrivers/net/netconsole.c:585:static ssize_t local_ip_show(struct config_item *item, char *buf)\ndrivers/net/netconsole.c-586-{\n--\ndrivers/net/netconsole.c-594-\ndrivers/net/netconsole.c:595:static ssize_t remote_ip_show(struct config_item *item, char *buf)\ndrivers/net/netconsole.c-596-{\n--\ndrivers/net/netconsole.c-604-\ndrivers/net/netconsole.c:605:static ssize_t local_mac_show(struct config_item *item, char *buf)\ndrivers/net/netconsole.c-606-{\n--\ndrivers/net/netconsole.c-612-\ndrivers/net/netconsole.c:613:static ssize_t remote_mac_show(struct config_item *item, char *buf)\ndrivers/net/netconsole.c-614-{\n--\ndrivers/net/netconsole.c-617-\ndrivers/net/netconsole.c:618:static ssize_t transmit_errors_show(struct config_item *item, char *buf)\ndrivers/net/netconsole.c-619-{\n--\ndrivers/net/netconsole.c-633-/* configfs helper to display if cpu_nr sysdata feature is enabled */\ndrivers/net/netconsole.c:634:static ssize_t sysdata_cpu_nr_enabled_show(struct config_item *item, char *buf)\ndrivers/net/netconsole.c-635-{\n--\ndrivers/net/netconsole.c-646-/* configfs helper to display if taskname sysdata feature is enabled */\ndrivers/net/netconsole.c:647:static ssize_t sysdata_taskname_enabled_show(struct config_item *item,\ndrivers/net/netconsole.c-648-\t\t\t\t\t char *buf)\n--\ndrivers/net/netconsole.c-659-\ndrivers/net/netconsole.c:660:static ssize_t sysdata_release_enabled_show(struct config_item *item,\ndrivers/net/netconsole.c-661-\t\t\t\t\t char *buf)\n--\ndrivers/net/netconsole.c-675- */\ndrivers/net/netconsole.c:676:static void unregister_netcons_consoles(void)\ndrivers/net/netconsole.c-677-{\n--\ndrivers/net/netconsole.c-699-\ndrivers/net/netconsole.c:700:static ssize_t sysdata_msgid_enabled_show(struct config_item *item,\ndrivers/net/netconsole.c-701-\t\t\t\t\t char *buf)\n--\ndrivers/net/netconsole.c-719- */\ndrivers/net/netconsole.c:720:static ssize_t enabled_store(struct config_item *item,\ndrivers/net/netconsole.c-721-\t\tconst char *buf, size_t count)\n--\ndrivers/net/netconsole.c-807-\ndrivers/net/netconsole.c:808:static ssize_t release_store(struct config_item *item, const char *buf,\ndrivers/net/netconsole.c-809-\t\t\t size_t count)\n--\ndrivers/net/netconsole.c-834-\ndrivers/net/netconsole.c:835:static ssize_t extended_store(struct config_item *item, const char *buf,\ndrivers/net/netconsole.c-836-\t\tsize_t count)\n--\ndrivers/net/netconsole.c-860-\ndrivers/net/netconsole.c:861:static ssize_t dev_name_store(struct config_item *item, const char *buf,\ndrivers/net/netconsole.c-862-\t\tsize_t count)\n--\ndrivers/net/netconsole.c-887-\ndrivers/net/netconsole.c:888:static ssize_t local_port_store(struct config_item *item, const char *buf,\ndrivers/net/netconsole.c-889-\t\tsize_t count)\n--\ndrivers/net/netconsole.c-909-\ndrivers/net/netconsole.c:910:static ssize_t remote_port_store(struct config_item *item,\ndrivers/net/netconsole.c-911-\t\tconst char *buf, size_t count)\n--\ndrivers/net/netconsole.c-931-\ndrivers/net/netconsole.c:932:static ssize_t local_ip_store(struct config_item *item, const char *buf,\ndrivers/net/netconsole.c-933-\t\tsize_t count)\n--\ndrivers/net/netconsole.c-956-\ndrivers/net/netconsole.c:957:static ssize_t remote_ip_store(struct config_item *item, const char *buf,\ndrivers/net/netconsole.c-958-\t size_t count)\n--\ndrivers/net/netconsole.c-986- */\ndrivers/net/netconsole.c:987:static size_t count_userdata_entries(struct netconsole_target *nt)\ndrivers/net/netconsole.c-988-{\n--\ndrivers/net/netconsole.c-991-\ndrivers/net/netconsole.c:992:static ssize_t remote_mac_store(struct config_item *item, const char *buf,\ndrivers/net/netconsole.c-993-\t\tsize_t count)\n--\ndrivers/net/netconsole.c=1018=struct userdatum {\n--\ndrivers/net/netconsole.c-1022-\ndrivers/net/netconsole.c:1023:static struct userdatum *to_userdatum(struct config_item *item)\ndrivers/net/netconsole.c-1024-{\n--\ndrivers/net/netconsole.c=1028=struct userdata {\n--\ndrivers/net/netconsole.c-1031-\ndrivers/net/netconsole.c:1032:static struct userdata *to_userdata(struct config_item *item)\ndrivers/net/netconsole.c-1033-{\n--\ndrivers/net/netconsole.c-1036-\ndrivers/net/netconsole.c:1037:static struct netconsole_target *userdata_to_target(struct userdata *ud)\ndrivers/net/netconsole.c-1038-{\n--\ndrivers/net/netconsole.c-1044-\ndrivers/net/netconsole.c:1045:static ssize_t userdatum_value_show(struct config_item *item, char *buf)\ndrivers/net/netconsole.c-1046-{\n--\ndrivers/net/netconsole.c-1053- */\ndrivers/net/netconsole.c:1054:static int calc_userdata_len(struct netconsole_target *nt)\ndrivers/net/netconsole.c-1055-{\n--\ndrivers/net/netconsole.c-1072-\ndrivers/net/netconsole.c:1073:static int update_userdata(struct netconsole_target *nt)\ndrivers/net/netconsole.c-1074-{\n--\ndrivers/net/netconsole.c-1120-\ndrivers/net/netconsole.c:1121:static ssize_t userdatum_value_store(struct config_item *item, const char *buf,\ndrivers/net/netconsole.c-1122-\t\t\t\t size_t count)\n--\ndrivers/net/netconsole.c-1159- */\ndrivers/net/netconsole.c:1160:static void disable_sysdata_feature(struct netconsole_target *nt,\ndrivers/net/netconsole.c-1161-\t\t\t\t enum sysdata_feature feature)\n--\ndrivers/net/netconsole.c-1166-\ndrivers/net/netconsole.c:1167:static ssize_t sysdata_msgid_enabled_store(struct config_item *item,\ndrivers/net/netconsole.c-1168-\t\t\t\t\t const char *buf, size_t count)\n--\ndrivers/net/netconsole.c-1195-\ndrivers/net/netconsole.c:1196:static ssize_t sysdata_release_enabled_store(struct config_item *item,\ndrivers/net/netconsole.c-1197-\t\t\t\t\t const char *buf, size_t count)\n--\ndrivers/net/netconsole.c-1224-\ndrivers/net/netconsole.c:1225:static ssize_t sysdata_taskname_enabled_store(struct config_item *item,\ndrivers/net/netconsole.c-1226-\t\t\t\t\t const char *buf, size_t count)\n--\ndrivers/net/netconsole.c-1254-/* configfs helper to sysdata cpu_nr feature */\ndrivers/net/netconsole.c:1255:static ssize_t sysdata_cpu_nr_enabled_store(struct config_item *item,\ndrivers/net/netconsole.c-1256-\t\t\t\t\t const char *buf, size_t count)\n--\ndrivers/net/netconsole.c=1292=CONFIGFS_ATTR(sysdata_, msgid_enabled);\ndrivers/net/netconsole.c-1293-\ndrivers/net/netconsole.c:1294:static struct configfs_attribute *userdatum_attrs[] = {\ndrivers/net/netconsole.c-1295-\t\u0026userdatum_attr_value,\n--\ndrivers/net/netconsole.c-1298-\ndrivers/net/netconsole.c:1299:static void userdatum_release(struct config_item *item)\ndrivers/net/netconsole.c-1300-{\n--\ndrivers/net/netconsole.c-1303-\ndrivers/net/netconsole.c:1304:static const struct configfs_item_operations userdatum_ops = {\ndrivers/net/netconsole.c-1305-\t.release = userdatum_release,\n--\ndrivers/net/netconsole.c-1307-\ndrivers/net/netconsole.c:1308:static const struct config_item_type userdatum_type = {\ndrivers/net/netconsole.c-1309-\t.ct_item_ops\t= \u0026userdatum_ops,\n--\ndrivers/net/netconsole.c-1313-\ndrivers/net/netconsole.c:1314:static struct config_item *userdatum_make_item(struct config_group *group,\ndrivers/net/netconsole.c-1315-\t\t\t\t\t const char *name)\n--\ndrivers/net/netconsole.c-1336-\ndrivers/net/netconsole.c:1337:static void userdatum_drop(struct config_group *group, struct config_item *item)\ndrivers/net/netconsole.c-1338-{\n--\ndrivers/net/netconsole.c-1350-\ndrivers/net/netconsole.c:1351:static struct configfs_attribute *userdata_attrs[] = {\ndrivers/net/netconsole.c-1352-\t\u0026sysdata_attr_cpu_nr_enabled,\n--\ndrivers/net/netconsole.c-1358-\ndrivers/net/netconsole.c:1359:static const struct configfs_group_operations userdata_ops = {\ndrivers/net/netconsole.c-1360-\t.make_item\t\t= userdatum_make_item,\n--\ndrivers/net/netconsole.c-1363-\ndrivers/net/netconsole.c:1364:static const struct config_item_type userdata_type = {\ndrivers/net/netconsole.c-1365-\t.ct_item_ops\t= \u0026userdatum_ops,\n--\ndrivers/net/netconsole.c=1381=CONFIGFS_ATTR_RO(, transmit_errors);\ndrivers/net/netconsole.c-1382-\ndrivers/net/netconsole.c:1383:static struct configfs_attribute *netconsole_target_attrs[] = {\ndrivers/net/netconsole.c-1384-\t\u0026attr_enabled,\n--\ndrivers/net/netconsole.c-1401-\ndrivers/net/netconsole.c:1402:static void netconsole_target_release(struct config_item *item)\ndrivers/net/netconsole.c-1403-{\n--\ndrivers/net/netconsole.c-1409-\ndrivers/net/netconsole.c:1410:static const struct configfs_item_operations netconsole_target_item_ops = {\ndrivers/net/netconsole.c-1411-\t.release\t\t= netconsole_target_release,\n--\ndrivers/net/netconsole.c-1413-\ndrivers/net/netconsole.c:1414:static const struct config_item_type netconsole_target_type = {\ndrivers/net/netconsole.c-1415-\t.ct_attrs\t\t= netconsole_target_attrs,\n--\ndrivers/net/netconsole.c-1419-\ndrivers/net/netconsole.c:1420:static void init_target_config_group(struct netconsole_target *nt,\ndrivers/net/netconsole.c-1421-\t\t\t\t const char *name)\n--\ndrivers/net/netconsole.c-1428-\ndrivers/net/netconsole.c:1429:static struct netconsole_target *find_cmdline_target(const char *name)\ndrivers/net/netconsole.c-1430-{\n--\ndrivers/net/netconsole.c-1449-\ndrivers/net/netconsole.c:1450:static struct config_group *make_netconsole_target(struct config_group *group,\ndrivers/net/netconsole.c-1451-\t\t\t\t\t\t const char *name)\n--\ndrivers/net/netconsole.c-1483-\ndrivers/net/netconsole.c:1484:static void drop_netconsole_target(struct config_group *group,\ndrivers/net/netconsole.c-1485-\t\t\t\t struct config_item *item)\n--\ndrivers/net/netconsole.c-1533-\ndrivers/net/netconsole.c:1534:static const struct configfs_group_operations netconsole_subsys_group_ops = {\ndrivers/net/netconsole.c-1535-\t.make_group\t= make_netconsole_target,\n--\ndrivers/net/netconsole.c-1538-\ndrivers/net/netconsole.c:1539:static const struct config_item_type netconsole_subsys_type = {\ndrivers/net/netconsole.c-1540-\t.ct_group_ops\t= \u0026netconsole_subsys_group_ops,\n--\ndrivers/net/netconsole.c-1544-/* The netconsole configfs subsystem */\ndrivers/net/netconsole.c:1545:static struct configfs_subsystem netconsole_subsys = {\ndrivers/net/netconsole.c-1546-\t.su_group\t= {\n--\ndrivers/net/netconsole.c-1553-\ndrivers/net/netconsole.c:1554:static void populate_configfs_item(struct netconsole_target *nt,\ndrivers/net/netconsole.c-1555-\t\t\t\t int cmdline_count)\n--\ndrivers/net/netconsole.c-1563-\ndrivers/net/netconsole.c:1564:static int sysdata_append_cpu_nr(struct netconsole_target *nt, int offset,\ndrivers/net/netconsole.c-1565-\t\t\t\t struct nbcon_write_context *wctxt)\n--\ndrivers/net/netconsole.c-1571-\ndrivers/net/netconsole.c:1572:static int sysdata_append_taskname(struct netconsole_target *nt, int offset,\ndrivers/net/netconsole.c-1573-\t\t\t\t struct nbcon_write_context *wctxt)\n--\ndrivers/net/netconsole.c-1579-\ndrivers/net/netconsole.c:1580:static int sysdata_append_release(struct netconsole_target *nt, int offset)\ndrivers/net/netconsole.c-1581-{\n--\ndrivers/net/netconsole.c-1586-\ndrivers/net/netconsole.c:1587:static int sysdata_append_msgid(struct netconsole_target *nt, int offset)\ndrivers/net/netconsole.c-1588-{\n--\ndrivers/net/netconsole.c-1599- */\ndrivers/net/netconsole.c:1600:static int prepare_sysdata(struct netconsole_target *nt,\ndrivers/net/netconsole.c-1601-\t\t\t struct nbcon_write_context *wctxt)\n--\ndrivers/net/netconsole.c-1625-/* Handle network interface device notifications */\ndrivers/net/netconsole.c:1626:static int netconsole_netdev_event(struct notifier_block *this,\ndrivers/net/netconsole.c-1627-\t\t\t\t unsigned long event, void *ptr)\n--\ndrivers/net/netconsole.c-1703-\ndrivers/net/netconsole.c:1704:static struct notifier_block netconsole_netdev_notifier = {\ndrivers/net/netconsole.c-1705-\t.notifier_call = netconsole_netdev_event,\n--\ndrivers/net/netconsole.c-1719- */\ndrivers/net/netconsole.c:1720:static struct sk_buff *netcons_skb_pop(struct netpoll *np, int len)\ndrivers/net/netconsole.c-1721-{\n--\ndrivers/net/netconsole.c-1742-\ndrivers/net/netconsole.c:1743:static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve)\ndrivers/net/netconsole.c-1744-{\n--\ndrivers/net/netconsole.c-1767-\ndrivers/net/netconsole.c:1768:static void netpoll_udp_checksum(struct netpoll *np, struct sk_buff *skb,\ndrivers/net/netconsole.c-1769-\t\t\t\t int len)\n--\ndrivers/net/netconsole.c-1792-\ndrivers/net/netconsole.c:1793:static void push_udp(struct netpoll *np, struct sk_buff *skb, int len)\ndrivers/net/netconsole.c-1794-{\n--\ndrivers/net/netconsole.c-1810-\ndrivers/net/netconsole.c:1811:static void push_eth(struct netpoll *np, struct sk_buff *skb)\ndrivers/net/netconsole.c-1812-{\n--\ndrivers/net/netconsole.c-1824-\ndrivers/net/netconsole.c:1825:static void push_ipv4(struct netpoll *np, struct sk_buff *skb, int len)\ndrivers/net/netconsole.c-1826-{\n--\ndrivers/net/netconsole.c-1851-\ndrivers/net/netconsole.c:1852:static void push_ipv6(struct netpoll *np, struct sk_buff *skb, int len)\ndrivers/net/netconsole.c-1853-{\n--\ndrivers/net/netconsole.c-1874-\ndrivers/net/netconsole.c:1875:static int netpoll_send_udp(struct netpoll *np, const char *msg, int len)\ndrivers/net/netconsole.c-1876-{\n--\ndrivers/net/netconsole.c-1919- */\ndrivers/net/netconsole.c:1920:static void send_udp(struct netconsole_target *nt, const char *msg, int len)\ndrivers/net/netconsole.c-1921-{\n--\ndrivers/net/netconsole.c-1936-\ndrivers/net/netconsole.c:1937:static void send_msg_no_fragmentation(struct netconsole_target *nt,\ndrivers/net/netconsole.c-1938-\t\t\t\t const char *msg,\n--\ndrivers/net/netconsole.c-1972-\ndrivers/net/netconsole.c:1973:static void append_release(char *buf)\ndrivers/net/netconsole.c-1974-{\n--\ndrivers/net/netconsole.c-1980-\ndrivers/net/netconsole.c:1981:static void send_fragmented_body(struct netconsole_target *nt,\ndrivers/net/netconsole.c-1982-\t\t\t\t const char *msgbody_ptr, int header_len,\n--\ndrivers/net/netconsole.c-2072-\ndrivers/net/netconsole.c:2073:static void send_msg_fragmented(struct netconsole_target *nt,\ndrivers/net/netconsole.c-2074-\t\t\t\tconst char *msg,\n--\ndrivers/net/netconsole.c-2118- */\ndrivers/net/netconsole.c:2119:static void send_ext_msg_udp(struct netconsole_target *nt,\ndrivers/net/netconsole.c-2120-\t\t\t struct nbcon_write_context *wctxt)\n--\ndrivers/net/netconsole.c-2150-\ndrivers/net/netconsole.c:2151:static void send_msg_udp(struct netconsole_target *nt, const char *msg,\ndrivers/net/netconsole.c-2152-\t\t\t unsigned int len)\n--\ndrivers/net/netconsole.c-2171- */\ndrivers/net/netconsole.c:2172:static void netconsole_write(struct nbcon_write_context *wctxt, bool extended)\ndrivers/net/netconsole.c-2173-{\n--\ndrivers/net/netconsole.c-2199-\ndrivers/net/netconsole.c:2200:static void netconsole_write_ext(struct console *con __always_unused,\ndrivers/net/netconsole.c-2201-\t\t\t\t struct nbcon_write_context *wctxt)\n--\ndrivers/net/netconsole.c-2205-\ndrivers/net/netconsole.c:2206:static void netconsole_write_basic(struct console *con __always_unused,\ndrivers/net/netconsole.c-2207-\t\t\t\t struct nbcon_write_context *wctxt)\n--\ndrivers/net/netconsole.c-2211-\ndrivers/net/netconsole.c:2212:static void netconsole_device_lock(struct console *con __always_unused,\ndrivers/net/netconsole.c-2213-\t\t\t\t unsigned long *flags)\ndrivers/net/netconsole.c=2214=__acquires(\u0026target_list_lock)\n--\ndrivers/net/netconsole.c-2218-\ndrivers/net/netconsole.c:2219:static void netconsole_device_unlock(struct console *con __always_unused,\ndrivers/net/netconsole.c-2220-\t\t\t\t unsigned long flags)\ndrivers/net/netconsole.c=2221=__releases(\u0026target_list_lock)\n--\ndrivers/net/netconsole.c-2225-\ndrivers/net/netconsole.c:2226:static int netconsole_parser_cmdline(struct netpoll *np, char *opt)\ndrivers/net/netconsole.c-2227-{\n--\ndrivers/net/netconsole.c-2320-/* Allocate new target (from boot/module param) and setup netpoll for it */\ndrivers/net/netconsole.c:2321:static struct netconsole_target *alloc_param_target(char *target_config,\ndrivers/net/netconsole.c-2322-\t\t\t\t\t\t int cmdline_count)\n\n"
} |
| 27/2 | 2026/08/05 12:20 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 25564 output: 65 thoughts: 60 Thoughts: **Analyzing the Netconsole Module** Okay, so I'm looking over this `netconsole` code, and the immediate thing that jumps out is that the crucial `init_module` and `cleanup_module` functions – the entry and exit points, really – are all macro-generated. Standard stuff. Nothing unusual there. But hold on... wasn't there a static function... hmm... yeah, `netconsole_write` is flagged as static. Alright, that means I need to make sure there are no other non-static functions floating around in `drivers/net/netconsole.c`. Let's dig in and see what else we can uncover. |
| 28/2 | 2026/08/05 12:20 | tool | grepper |
0mArgs:{
"Expression": "^[a-zA-Z_][a-zA-Z0-9_]* [a-zA-Z_][a-zA-Z0-9_]*\\(",
"PathPrefix": "drivers/net/netconsole.c"
}Results: {
"Output": "drivers/net/netconsole.c=80=__setup(\"netconsole=\", option_setup);\n--\ndrivers/net/netconsole.c-83-/* Linked list of all configured targets */\ndrivers/net/netconsole.c:84:static LIST_HEAD(target_list);\ndrivers/net/netconsole.c-85-/* target_cleanup_list is used to track targets that need to be cleaned outside\n--\ndrivers/net/netconsole.c-88- */\ndrivers/net/netconsole.c:89:static LIST_HEAD(target_cleanup_list);\ndrivers/net/netconsole.c-90-\ndrivers/net/netconsole.c-91-/* This needs to be a spinlock because write_msg() cannot sleep */\ndrivers/net/netconsole.c:92:static DEFINE_SPINLOCK(target_list_lock);\ndrivers/net/netconsole.c-93-/* This needs to be a mutex because netpoll_cleanup might sleep */\ndrivers/net/netconsole.c:94:static DEFINE_MUTEX(target_cleanup_list_lock);\ndrivers/net/netconsole.c-95-\n--\ndrivers/net/netconsole.c=215=static struct configfs_subsystem netconsole_subsys;\ndrivers/net/netconsole.c:216:static DEFINE_MUTEX(dynamic_netconsole_mutex);\ndrivers/net/netconsole.c-217-\n"
} |
| 29/2 | 2026/08/05 12:20 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 26188 output: 32 thoughts: 103 Thoughts: **Debugging My Regex**
Okay, so I've got this regex and it's just not quite right. I was trying to find function declarations in `drivers/net/netconsole.c` but I'm clearly missing something. Let me try `grep -E '^[a-zA-Z_][a-zA-Z0-9_]* [a-zA-Z_][a-zA-Z0-9_]*\(' drivers/net/netconsole.c`. That should catch most of them... but wait, I know from memory that most functions in that file are declared `static`. That probably explains why the results aren't what I expect. I need to account for that. Let me quickly check `init_netconsole` to see if there are any obvious issues.
|
| 30/2 | 2026/08/05 12:20 | tool | grepper |
0mArgs:{
"Expression": "init_netconsole",
"PathPrefix": "drivers/net/netconsole.c"
}Results: {
"Output": "drivers/net/netconsole.c=2394=static struct console netconsole = {\n--\ndrivers/net/netconsole.c-2402-\ndrivers/net/netconsole.c:2403:static int __init init_netconsole(void)\ndrivers/net/netconsole.c-2404-{\n--\ndrivers/net/netconsole.c=2484=static void __exit cleanup_netconsole(void)\n--\ndrivers/net/netconsole.c-2517- */\ndrivers/net/netconsole.c:2518:late_initcall(init_netconsole);\ndrivers/net/netconsole.c-2519-module_exit(cleanup_netconsole);\n"
} |
| 31/2 | 2026/08/05 12:20 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 26680 output: 34 thoughts: 612 Thoughts: **My Analysis of Function Entry Points and Configurations** Okay, so I need to identify the crucial static functions and configurations here. Since the instructions prioritize non-static entry points, I'll first check if there are any, and if not, fall back on the static ones, focusing on modified functions. Looking at the list of modified static functions, I have: `update_userdata`, `netconsole_target_release`, `send_msg_no_fragmentation`, `send_fragmented_body`, `send_msg_fragmented`, `send_ext_msg_udp`, `send_msg_udp`, and `free_param_target`. Following the instructions, I'll focus on the functions that seem like potential API entrypoints or have a good chance of *not* being inlined. `update_userdata`, `send_ext_msg_udp`, `send_msg_fragmented`, `send_msg_no_fragmentation`, and `send_fragmented_body` are the front runners. `send_ext_msg_udp` and `update_userdata` are particularly interesting. I need to make sure I don't overlook any inlined functions that could be more significant. Now, I'm noting the config options. We have `NETCONSOLE`, `NETCONSOLE_DYNAMIC`, and `CONFIGFS_FS`. I know `CONFIGFS_FS` is pretty standard, but I'll include it just to be safe. I see that `NETCONSOLE_DYNAMIC` depends on `NETCONSOLE && SYSFS && CONFIGFS_FS`. Let's assume that `SYSFS` is likely implied. So my `EnableConfigs` list is `["NETCONSOLE", "NETCONSOLE_DYNAMIC", "CONFIGFS_FS"]`. I'll check the dependencies of `NETCONSOLE`. Seems it depends on `PRINTK`, which is standard. So now, for my `FocusSymbols` list, based on the previous evaluation, I'll go with `["update_userdata", "send_ext_msg_udp", "send_msg_fragmented", "userdatum_value_store", "userdatum_drop"]`. I'll verify that `userdatum_value_store` and `userdatum_drop` are static, as I suspect. I should also make a note of the console write callbacks, in case those turn out to be important: `netconsole_write`, `netconsole_write_ext`, and `netconsole_write_basic`. Let's take a closer look at `netconsole_write_ext`. |
| 32/2 | 2026/08/05 12:20 | tool | grepper |
0mArgs:{
"Expression": "netconsole_write_ext",
"PathPrefix": "drivers/net/netconsole.c"
}Results: {
"Output": "drivers/net/netconsole.c=2172=static void netconsole_write(struct nbcon_write_context *wctxt, bool extended)\n--\ndrivers/net/netconsole.c-2199-\ndrivers/net/netconsole.c:2200:static void netconsole_write_ext(struct console *con __always_unused,\ndrivers/net/netconsole.c-2201-\t\t\t\t struct nbcon_write_context *wctxt)\n--\ndrivers/net/netconsole.c=2385=static struct console netconsole_ext = {\n--\ndrivers/net/netconsole.c-2387-\t.flags = CON_ENABLED | CON_EXTENDED | CON_NBCON | CON_NBCON_ATOMIC_UNSAFE,\ndrivers/net/netconsole.c:2388:\t.write_thread = netconsole_write_ext,\ndrivers/net/netconsole.c:2389:\t.write_atomic = netconsole_write_ext,\ndrivers/net/netconsole.c-2390-\t.device_lock = netconsole_device_lock,\n"
} |
| 33/2 | 2026/08/05 12:20 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 28152 output: 186 thoughts: 571 Thoughts: **My Analysis of the Netconsole RCU Implementation** Okay, let's break this down. From what I'm seeing, this patch is fundamentally about implementing Read-Copy-Update (RCU) protection for the `userdata` field within the netconsole driver. The core of this seems to be focused on preventing use-after-free and data races related to how the configuration data is managed and accessed. The key entry points are clear: `netconsole_write_ext` and `netconsole_write_basic` are the public faces for writing to the console, and `userdatum_value_store` and `userdatum_drop` are the configfs entry points for managing the `userdata`. My understanding is that: * `update_userdata` is the crucial function for updating the `netcons_userdata` structure using `rcu_replace_pointer`. This is where the new data comes in and the old data is gracefully relinquished via RCU semantics. * `send_ext_msg_udp` is the critical function for reading this protected `userdata`. I see it using `rcu_read_lock()`, `rcu_dereference()` and `rcu_read_unlock()` to safely access the data. This implies a read-side critical section, meaning we could potentially have high read performance when updating the configs. * `userdatum_value_store` and `userdatum_drop` are the configfs hooks that ultimately *call* `update_userdata` to handle configuration changes. Specifically, I'm noting that `send_ext_msg_udp`, `send_msg_no_fragmentation`, `send_fragmented_body`, and `send_msg_fragmented` are all modified to take `userdata` as an argument. The patch is ensuring the current userdata is passed down, instead of some other copy of the userdata. The `netconsole_target_release` and `free_param_target` functions are also modified to `kfree()` the old userdata using `rcu_access_pointer`, indicating the release part of the RCU cycle. Therefore, for my testing and analysis, my initial list of functions I will pay close attention to is: * `update_userdata` (for RCU update) * `send_ext_msg_udp` (for RCU read) * `userdatum_value_store` (configfs update) * `userdatum_drop` (configfs update) * `netconsole_write_ext` (because I see it at the top, and likely interacts with all the functions above, with `netconsole_write_basic`) Given this change is fundamental to the RCU implementation, it's critical to fuzz this area with concurrent updates through configfs and console writes to ensure no memory leaks, use-after-free scenarios, or data races are introduced. The key configurations I need to verify are `NETCONSOLE`, `NETCONSOLE_DYNAMIC`, and `CONFIGFS_FS`. This looks like a solid functional change for the core kernel, likely increasing its stability. Time to set up that fuzzing campaign. |
| 34/2 | 2026/08/05 12:21 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"NETCONSOLE",
"NETCONSOLE_DYNAMIC",
"CONFIGFS_FS"
],
"FocusSymbols": [
"update_userdata",
"send_ext_msg_udp",
"userdatum_value_store",
"userdatum_drop",
"netconsole_write_ext"
],
"Reasoning": "The patch introduces RCU protection for the `userdata` payload in the netconsole driver. It modifies how userdata is updated via configfs and how it is read during message transmission. This is a functional change in the core kernel (drivers/net/netconsole.c) that prevents use-after-free and data races. It is worth fuzzing to ensure the RCU implementation is correct and doesn't introduce memory leaks or crashes under concurrent configfs updates and console writes.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"NETCONSOLE",
"NETCONSOLE_DYNAMIC",
"CONFIGFS_FS"
],
"FocusSymbols": [
"update_userdata",
"send_ext_msg_udp",
"userdatum_value_store",
"userdatum_drop",
"netconsole_write_ext"
],
"Reasoning": "The patch introduces RCU protection for the `userdata` payload in the netconsole driver. It modifies how userdata is updated via configfs and how it is read during message transmission. This is a functional change in the core kernel (drivers/net/netconsole.c) that prevents use-after-free and data races. It is worth fuzzing to ensure the RCU implementation is correct and doesn't introduce memory leaks or crashes under concurrent configfs updates and console writes.",
"WorthFuzzing": true
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|
| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|