AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/08/11 19:27 flow patch-triage
0m Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch only modifies selftests (tools/testing/selftests/net/openvswitch/*) and does not make any functional changes to the kernel source code.",
  "WorthFuzzing": false
}
1/1 2026/08/11 19:27 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit 1e15db1a1874b3471017c0cf3f992980502b3fe0\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Tue Aug 11 19:26:58 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/net/openvswitch/config b/tools/testing/selftests/net/openvswitch/config\nindex 05ca6affb5107..a825e0b5c88e5 100644\n--- a/tools/testing/selftests/net/openvswitch/config\n+++ b/tools/testing/selftests/net/openvswitch/config\n@@ -1,5 +1,6 @@\n CONFIG_GENEVE=m\n CONFIG_INET_DIAG=y\n+CONFIG_IP_SCTP=y\n CONFIG_IPV6=y\n CONFIG_NETFILTER=y\n CONFIG_NET_IPGRE=m\ndiff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh\nindex f63001dc25104..a31f7fb6882dc 100755\n--- a/tools/testing/selftests/net/openvswitch/openvswitch.sh\n+++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh\n@@ -33,6 +33,7 @@ tests=\"\n \taction_set\t\t\t\tset: SET action rewrites fields\n \ttrunc\t\t\t\t\ttrunc: output truncation\n \ticmpv6\t\t\t\t\ticmpv6: ICMPv6 echo type match\n+\tsctp_connect_v4\t\t\t\tsctp: SCTP flow key matching\n \tpsample\t\t\t\t\tpsample: Sampling packets with psample\"\n \n info() {\n@@ -610,6 +611,95 @@ test_icmpv6() {\n \treturn 0\n }\n \n+# Check for an SCTP endpoint via /proc, which works without sctp_diag.\n+sctp_eps_has() {\n+\tip netns exec \"$1\" awk -v p=\"$2\" '$6==p' /proc/net/sctp/eps | grep -q .\n+}\n+\n+# sctp_connect_v4 test\n+# - sctp(dst=4443) matches client-to-server INIT\n+# - sctp(src=4443) matches server-to-client INIT-ACK\n+# - remove flows and verify connection fails, reinstall and recover\n+test_sctp_connect_v4() {\n+\tlocal t=\"test_sctp_connect_v4\"\n+\tlocal srv_ip=172.31.110.20\n+\n+\tmodprobe -q sctp 2\u003e/dev/null || return \"$ksft_skip\"\n+\tsocat -V 2\u003e\u00261 | grep -q \"define WITH_SCTP\" || return \"$ksft_skip\"\n+\n+\tsbx_add \"$t\" || return $?\n+\tovs_add_dp \"$t\" sctp4 || return 1\n+\n+\tinfo \"create namespaces\"\n+\tfor ns in client server; do\n+\t\tovs_add_netns_and_veths \"$t\" \"sctp4\" \"$ns\" \\\n+\t\t    \"${ns:0:1}0\" \"${ns:0:1}1\" || return 1\n+\tdone\n+\n+\tip netns exec client ip addr add 172.31.110.10/24 dev c1\n+\tip netns exec client ip link set c1 up\n+\tip netns exec server ip addr add \"${srv_ip}/24\" dev s1\n+\tip netns exec server ip link set s1 up\n+\n+\t# ARP forwarding\n+\tovs_add_flow \"$t\" sctp4 \\\n+\t    'in_port(1),eth(),eth_type(0x0806),arp()' \\\n+\t    '2' || return 1\n+\tovs_add_flow \"$t\" sctp4 \\\n+\t    'in_port(2),eth(),eth_type(0x0806),arp()' \\\n+\t    '1' || return 1\n+\n+\t# SCTP port matching: dst for request, src for reply\n+\tovs_add_flow \"$t\" sctp4 \\\n+\t    'in_port(1),eth(),eth_type(0x0800),ipv4(proto=132),sctp(dst=4443)' \\\n+\t    '2' || return 1\n+\tovs_add_flow \"$t\" sctp4 \\\n+\t    'in_port(2),eth(),eth_type(0x0800),ipv4(proto=132),sctp(src=4443)' \\\n+\t    '1' || return 1\n+\n+\t# The listener forks a child per association, so one instance serves\n+\t# the whole test and the flows stay the only variable. -t 1 bounds\n+\t# how long a child lingers after its association closes.\n+\tovs_netns_spawn_daemon \"$t\" \"server\" \\\n+\t    socat -u -t 1 SCTP4-LISTEN:4443,fork STDOUT\n+\tovs_wait sctp_eps_has server 4443 || return 1\n+\n+\tinfo \"verify SCTP association with port-keyed flows\"\n+\tovs_sbx \"$t\" ip netns exec client \\\n+\t    timeout 3 socat -u STDIN \"SCTP4-CONNECT:${srv_ip}:4443\" \u003c/dev/null \\\n+\t    || return 1\n+\n+\tovs_del_flows \"$t\" sctp4\n+\n+\tinfo \"verify connection fails without flows\"\n+\tovs_add_flow \"$t\" sctp4 \\\n+\t    'in_port(1),eth(),eth_type(0x0806),arp()' \\\n+\t    '2' || return 1\n+\tovs_add_flow \"$t\" sctp4 \\\n+\t    'in_port(2),eth(),eth_type(0x0806),arp()' \\\n+\t    '1' || return 1\n+\n+\tovs_sbx \"$t\" ip netns exec client \\\n+\t    timeout 3 socat -u STDIN \"SCTP4-CONNECT:${srv_ip}:4443\" \u003c/dev/null \\\n+\t    \u003e/dev/null 2\u003e\u00261 \\\n+\t    \u0026\u0026 { info \"connection should fail without flows\"\n+\t         return 1; }\n+\n+\tinfo \"reinstall flows and verify recovery\"\n+\tovs_add_flow \"$t\" sctp4 \\\n+\t    'in_port(1),eth(),eth_type(0x0800),ipv4(proto=132),sctp(dst=4443)' \\\n+\t    '2' || return 1\n+\tovs_add_flow \"$t\" sctp4 \\\n+\t    'in_port(2),eth(),eth_type(0x0800),ipv4(proto=132),sctp(src=4443)' \\\n+\t    '1' || return 1\n+\n+\tovs_sbx \"$t\" ip netns exec client \\\n+\t    timeout 3 socat -u STDIN \"SCTP4-CONNECT:${srv_ip}:4443\" \u003c/dev/null \\\n+\t    || return 1\n+\n+\treturn 0\n+}\n+\n # psample test\n # - use psample to observe packets\n test_psample() {\ndiff --git a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py\nindex 3ece07d472814..1615843c225e4 100644\n--- a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py\n+++ b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py\n@@ -1984,6 +1984,11 @@ class ovskey(nla):\n                 \"udp\",\n                 ovskey.ovs_key_udp,\n             ),\n+            (\n+                \"OVS_KEY_ATTR_SCTP\",\n+                \"sctp\",\n+                ovskey.ovs_key_sctp,\n+            ),\n             (\n                 \"OVS_KEY_ATTR_ICMP\",\n                 \"icmp\",\n"
}
2/1 2026/08/11 19:27 agent patch-evaluator
0m Model: 
best-expensive

Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies selftests (tools/testing/selftests/net/openvswitch/*) and does not make any functional changes to the kernel source code.",
  "WorthFuzzing": false
}

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 1e15db1a1874b3471017c0cf3f992980502b3fe0
Author: syz-cluster <triage@syzkaller.com>
Date:   Tue Aug 11 19:26:58 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/net/openvswitch/config b/tools/testing/selftests/net/openvswitch/config
index 05ca6affb5107..a825e0b5c88e5 100644
--- a/tools/testing/selftests/net/openvswitch/config
+++ b/tools/testing/selftests/net/openvswitch/config
@@ -1,5 +1,6 @@
 CONFIG_GENEVE=m
 CONFIG_INET_DIAG=y
+CONFIG_IP_SCTP=y
 CONFIG_IPV6=y
 CONFIG_NETFILTER=y
 CONFIG_NET_IPGRE=m
diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh
index f63001dc25104..a31f7fb6882dc 100755
--- a/tools/testing/selftests/net/openvswitch/openvswitch.sh
+++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh
@@ -33,6 +33,7 @@ tests="
 	action_set				set: SET action rewrites fields
 	trunc					trunc: output truncation
 	icmpv6					icmpv6: ICMPv6 echo type match
+	sctp_connect_v4				sctp: SCTP flow key matching
 	psample					psample: Sampling packets with psample"
 
 info() {
@@ -610,6 +611,95 @@ test_icmpv6() {
 	return 0
 }
 
+# Check for an SCTP endpoint via /proc, which works without sctp_diag.
+sctp_eps_has() {
+	ip netns exec "$1" awk -v p="$2" '$6==p' /proc/net/sctp/eps | grep -q .
+}
+
+# sctp_connect_v4 test
+# - sctp(dst=4443) matches client-to-server INIT
+# - sctp(src=4443) matches server-to-client INIT-ACK
+# - remove flows and verify connection fails, reinstall and recover
+test_sctp_connect_v4() {
+	local t="test_sctp_connect_v4"
+	local srv_ip=172.31.110.20
+
+	modprobe -q sctp 2>/dev/null || return "$ksft_skip"
+	socat -V 2>&1 | grep -q "define WITH_SCTP" || return "$ksft_skip"
+
+	sbx_add "$t" || return $?
+	ovs_add_dp "$t" sctp4 || return 1
+
+	info "create namespaces"
+	for ns in client server; do
+		ovs_add_netns_and_veths "$t" "sctp4" "$ns" \
+		    "${ns:0:1}0" "${ns:0:1}1" || return 1
+	done
+
+	ip netns exec client ip addr add 172.31.110.10/24 dev c1
+	ip netns exec client ip link set c1 up
+	ip netns exec server ip addr add "${srv_ip}/24" dev s1
+	ip netns exec server ip link set s1 up
+
+	# ARP forwarding
+	ovs_add_flow "$t" sctp4 \
+	    'in_port(1),eth(),eth_type(0x0806),arp()' \
+	    '2' || return 1
+	ovs_add_flow "$t" sctp4 \
+	    'in_port(2),eth(),eth_type(0x0806),arp()' \
+	    '1' || return 1
+
+	# SCTP port matching: dst for request, src for reply
+	ovs_add_flow "$t" sctp4 \
+	    'in_port(1),eth(),eth_type(0x0800),ipv4(proto=132),sctp(dst=4443)' \
+	    '2' || return 1
+	ovs_add_flow "$t" sctp4 \
+	    'in_port(2),eth(),eth_type(0x0800),ipv4(proto=132),sctp(src=4443)' \
+	    '1' || return 1
+
+	# The listener forks a child per association, so one instance serves
+	# the whole test and the flows stay the only variable. -t 1 bounds
+	# how long a child lingers after its association closes.
+	ovs_netns_spawn_daemon "$t" "server" \
+	    socat -u -t 1 SCTP4-LISTEN:4443,fork STDOUT
+	ovs_wait sctp_eps_has server 4443 || return 1
+
+	info "verify SCTP association with port-keyed flows"
+	ovs_sbx "$t" ip netns exec client \
+	    timeout 3 socat -u STDIN "SCTP4-CONNECT:${srv_ip}:4443" </dev/null \
+	    || return 1
+
+	ovs_del_flows "$t" sctp4
+
+	info "verify connection fails without flows"
+	ovs_add_flow "$t" sctp4 \
+	    'in_port(1),eth(),eth_type(0x0806),arp()' \
+	    '2' || return 1
+	ovs_add_flow "$t" sctp4 \
+	    'in_port(2),eth(),eth_type(0x0806),arp()' \
+	    '1' || return 1
+
+	ovs_sbx "$t" ip netns exec client \
+	    timeout 3 socat -u STDIN "SCTP4-CONNECT:${srv_ip}:4443" </dev/null \
+	    >/dev/null 2>&1 \
+	    && { info "connection should fail without flows"
+	         return 1; }
+
+	info "reinstall flows and verify recovery"
+	ovs_add_flow "$t" sctp4 \
+	    'in_port(1),eth(),eth_type(0x0800),ipv4(proto=132),sctp(dst=4443)' \
+	    '2' || return 1
+	ovs_add_flow "$t" sctp4 \
+	    'in_port(2),eth(),eth_type(0x0800),ipv4(proto=132),sctp(src=4443)' \
+	    '1' || return 1
+
+	ovs_sbx "$t" ip netns exec client \
+	    timeout 3 socat -u STDIN "SCTP4-CONNECT:${srv_ip}:4443" </dev/null \
+	    || return 1
+
+	return 0
+}
+
 # psample test
 # - use psample to observe packets
 test_psample() {
diff --git a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
index 3ece07d472814..1615843c225e4 100644
--- a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
+++ b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
@@ -1984,6 +1984,11 @@ class ovskey(nla):
                 "udp",
                 ovskey.ovs_key_udp,
             ),
+            (
+                "OVS_KEY_ATTR_SCTP",
+                "sctp",
+                ovskey.ovs_key_sctp,
+            ),
             (
                 "OVS_KEY_ATTR_ICMP",
                 "icmp",

3/2 2026/08/11 19:27 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 3874
							output: 67
							thoughts: 388

Thoughts: 
**Analyzing the SCTP Flow Key Matching Test Patch**

Okay, so I'm looking at this patch that introduces an SCTP flow key matching test for Open vSwitch. Seems straightforward enough – it's touching the usual suspects in the selftest infrastructure: the config, the shell script, and the Python helper. Specifically, it's updating the config to enable SCTP support, adding a test called `test_sctp_connect_v4` in the shell script, and introducing `OVS_KEY_ATTR_SCTP` in the Python utility.

My initial thought is to make sure this is *just* a test. I need to confirm this patch doesn't accidentally introduce any modifications to core kernel code. Let's re-examine the diff. Alright, good. It's only modifying the files within the `tools/testing/selftests/net/openvswitch/` directory. No changes to the kernel's core modules, particularly things like the `net/openvswitch/` directory.

Since this is purely selftests, I'm confident there are no functional changes that warrant fuzzing. The patch doesn't modify any code the fuzzer needs to interact with in the kernel. Therefore, I'm going to set `WorthFuzzing` to `false`. Let me double check that there are no hidden files that could change this, but the diff is complete, and it does not look like any are. I'll make sure to add a clear explanation to the results that this is a selftest addition only.

I'm ready to call `set-results` with `WorthFuzzing=false`.

4/2 2026/08/11 19:27 tool set-results
0m Args: 
{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies selftests (tools/testing/selftests/net/openvswitch/*) and does not make any functional changes to the kernel source code.",
  "WorthFuzzing": false
}

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies selftests (tools/testing/selftests/net/openvswitch/*) and does not make any functional changes to the kernel source code.",
  "WorthFuzzing": false
}
5/1 2026/08/11 19:27 action If
0m Args: 
{
  "WorthFuzzing": false
}

Results: 
null
LLM Calls Summary:
Total Calls Total Tokens Avg Tokens Total Duration (Seconds) Avg Duration (Seconds)
Tool Calls Summary:
Total Calls Total Duration (Seconds) Avg Duration (Seconds)