AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/07/15 07:56 flow patch-triage
0m Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies user-space selftests (tools/testing/selftests/net/openvswitch/) and does not make any functional changes to the kernel code.",
  "WorthFuzzing": false
}
1/1 2026/07/15 07:56 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit 73b9c62943a5bf11d7a877bba8cde57427be0bce\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Wed Jul 15 07:56:01 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh\nindex 2954245129a2f4..0ec9c969cd0a85 100755\n--- a/tools/testing/selftests/net/openvswitch/openvswitch.sh\n+++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh\n@@ -32,6 +32,7 @@ tests=\"\n \tdec_ttl\t\t\t\t\tttl: dec_ttl decrements IP TTL\n \tflow_set\t\t\t\tflow-set: Flow modify\n \taction_set\t\t\t\tset: SET action rewrites fields\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@@ -443,6 +444,110 @@ test_action_set() {\n \treturn 0\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+\n+\twhich nc \u003e/dev/null 2\u003e\u00261 || return $ksft_skip\n+\tnc --sctp -z 127.0.0.1 1 \u003c/dev/null 2\u003e/dev/null || return $ksft_skip\n+\tmodprobe -q sctp 2\u003e/dev/null || 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 172.31.110.20/24 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+\techo \"server\" | \\\n+\t\tovs_netns_spawn_daemon \"$t\" \"server\" \\\n+\t\t\t\tnc --sctp -l 172.31.110.20 -vn 4443\n+\tlocal server_pid=$pid\n+\tovs_wait ip netns exec server \\\n+\t    ss -lnH sport = :4443 \\| grep -q . \\\n+\t    || return 1\n+\n+\tinfo \"verify SCTP association with port-keyed flows\"\n+\tovs_sbx \"$t\" ip netns exec client \\\n+\t    nc --sctp -i 1 -zv 172.31.110.20 4443 \\\n+\t    || return 1\n+\n+\tovs_del_flows \"$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+\tkill -TERM $server_pid 2\u003e/dev/null\n+\twait $server_pid 2\u003e/dev/null\n+\techo \"server2\" | \\\n+\t\tovs_netns_spawn_daemon \"$t\" \"server\" \\\n+\t\t\t\tnc --sctp -l 172.31.110.20 -vn 4443\n+\tserver_pid=$pid\n+\tovs_wait ip netns exec server \\\n+\t    ss -lnH sport = :4443 \\| grep -q . \\\n+\t    || return 1\n+\n+\tovs_sbx \"$t\" ip netns exec client \\\n+\t    nc --sctp -w 2 -zv 172.31.110.20 4443 \\\n+\t    \u003e/dev/null 2\u003e\u00261 \\\n+\t    \u0026\u0026 { info \"FAIL: 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+\tkill -TERM $server_pid 2\u003e/dev/null\n+\twait $server_pid 2\u003e/dev/null\n+\techo \"server3\" | \\\n+\t\tovs_netns_spawn_daemon \"$t\" \"server\" \\\n+\t\t\t\tnc --sctp -l 172.31.110.20 -vn 4443\n+\tovs_wait ip netns exec server \\\n+\t    ss -lnH sport = :4443 \\| grep -q . \\\n+\t    || return 1\n+\n+\tovs_sbx \"$t\" ip netns exec client \\\n+\t    nc --sctp -i 1 -zv 172.31.110.20 4443 \\\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 e1ecfad2c03e37..7cfc29ec7e5931 100644\n--- a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py\n+++ b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py\n@@ -1982,6 +1982,11 @@ class ovskey(nla):\n                 \"icmp\",\n                 ovskey.ovs_key_icmp,\n             ),\n+            (\n+                \"OVS_KEY_ATTR_SCTP\",\n+                \"sctp\",\n+                ovskey.ovs_key_sctp,\n+            ),\n             (\n                 \"OVS_KEY_ATTR_TCP_FLAGS\",\n                 \"tcp_flags\",\n"
}
2/1 2026/07/15 07:56 agent patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies user-space selftests (tools/testing/selftests/net/openvswitch/) and does not make any functional changes to the kernel 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).

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.
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.
   Do not list too generic configs (we already have them enabled). Only list those that
   specifically cover the modified code. 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 73b9c62943a5bf11d7a877bba8cde57427be0bce
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Jul 15 07:56:01 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh
index 2954245129a2f4..0ec9c969cd0a85 100755
--- a/tools/testing/selftests/net/openvswitch/openvswitch.sh
+++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh
@@ -32,6 +32,7 @@ tests="
 	dec_ttl					ttl: dec_ttl decrements IP TTL
 	flow_set				flow-set: Flow modify
 	action_set				set: SET action rewrites fields
+	sctp_connect_v4				sctp: SCTP flow key matching
 	psample					psample: Sampling packets with psample"
 
 info() {
@@ -443,6 +444,110 @@ test_action_set() {
 	return 0
 }
 
+# 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"
+
+	which nc >/dev/null 2>&1 || return $ksft_skip
+	nc --sctp -z 127.0.0.1 1 </dev/null 2>/dev/null || return $ksft_skip
+	modprobe -q sctp 2>/dev/null || 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 172.31.110.20/24 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
+
+	echo "server" | \
+		ovs_netns_spawn_daemon "$t" "server" \
+				nc --sctp -l 172.31.110.20 -vn 4443
+	local server_pid=$pid
+	ovs_wait ip netns exec server \
+	    ss -lnH sport = :4443 \| grep -q . \
+	    || return 1
+
+	info "verify SCTP association with port-keyed flows"
+	ovs_sbx "$t" ip netns exec client \
+	    nc --sctp -i 1 -zv 172.31.110.20 4443 \
+	    || return 1
+
+	ovs_del_flows "$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
+
+	kill -TERM $server_pid 2>/dev/null
+	wait $server_pid 2>/dev/null
+	echo "server2" | \
+		ovs_netns_spawn_daemon "$t" "server" \
+				nc --sctp -l 172.31.110.20 -vn 4443
+	server_pid=$pid
+	ovs_wait ip netns exec server \
+	    ss -lnH sport = :4443 \| grep -q . \
+	    || return 1
+
+	ovs_sbx "$t" ip netns exec client \
+	    nc --sctp -w 2 -zv 172.31.110.20 4443 \
+	    >/dev/null 2>&1 \
+	    && { info "FAIL: 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
+
+	kill -TERM $server_pid 2>/dev/null
+	wait $server_pid 2>/dev/null
+	echo "server3" | \
+		ovs_netns_spawn_daemon "$t" "server" \
+				nc --sctp -l 172.31.110.20 -vn 4443
+	ovs_wait ip netns exec server \
+	    ss -lnH sport = :4443 \| grep -q . \
+	    || return 1
+
+	ovs_sbx "$t" ip netns exec client \
+	    nc --sctp -i 1 -zv 172.31.110.20 4443 \
+	    || 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 e1ecfad2c03e37..7cfc29ec7e5931 100644
--- a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
+++ b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py
@@ -1982,6 +1982,11 @@ class ovskey(nla):
                 "icmp",
                 ovskey.ovs_key_icmp,
             ),
+            (
+                "OVS_KEY_ATTR_SCTP",
+                "sctp",
+                ovskey.ovs_key_sctp,
+            ),
             (
                 "OVS_KEY_ATTR_TCP_FLAGS",
                 "tcp_flags",

3/2 2026/07/15 07:56 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 3763
							output: 68
							thoughts: 642

Thoughts: 
**Patch Analysis: Selftest Modification - Not Worth Fuzzing**

Okay, so I'm looking at this patch and it's touching `tools/testing/selftests/net/openvswitch/openvswitch.sh` and `tools/testing/selftests/net/openvswitch/ovs-dpctl.py`.  It looks like the patch is adding a `test_sctp_connect_v4` test and also includes `OVS_KEY_ATTR_SCTP` in the `ovs-dpctl.py` script.

The immediate question is, does this affect *actual* kernel code – drivers, core logic, architecture-related stuff?  No, from the files listed, it’s just the selftests directory. Let's make sure.

Hmm, let me double-check the diff. Yep, it's just those two files, nothing else. Nothing deep. This is purely user-space, a test.

Alright, so since this patch only modifies selftests, this is not something I need to send to the fuzzers. It isn't modifying anything that affects the kernel binary itself.

Now, I remember the fuzzing guidelines. Let me double-check them. Right, modifications to Documentation, Kconfig files, comments, logging, and constants that don't affect execution flow are all reasons to *not* fuzz. Selftests aren't *explicitly* listed, but they are analogous: selftests are not a part of the kernel code. They are user-space tests. It doesn't make sense to fuzz the kernel code for changes that are specific to running these tests.

I'm confident. This is a clear case for `WorthFuzzing=false`. I’ll use the `set-results` tool to set this, with the following reasoning: "The patch only modifies user-space selftests (tools/testing/selftests/net/openvswitch/) and does not make any functional changes to the kernel code."  EnableConfigs and FocusSymbols are not relevant here.

4/2 2026/07/15 07:56 tool set-results
0m Args: 
{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies user-space selftests (tools/testing/selftests/net/openvswitch/) and does not make any functional changes to the kernel code.",
  "WorthFuzzing": false
}

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