AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/06/24 11:15 flow patch-triage
0m Args: 
null

Results: 
{
  "EnableConfigs": [
    "IPV6"
  ],
  "FocusSymbols": [
    "addrconf_sysctl_forward",
    "addrconf_sysctl_disable",
    "addrconf_sysctl_proxy_ndp",
    "addrconf_sysctl_ignore_routes_with_linkdown",
    "addrconf_sysctl_disable_policy"
  ],
  "Reasoning": "The patch fixes several IPv6 sysctl handlers, including return values, locking, and missing netlink notifications. Fuzzing these sysctl handlers can help ensure the fixes are correct and don't introduce regressions.",
  "WorthFuzzing": true
}
1/1 2026/06/24 11:15 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit 098ca20002137b9e6db53bb2884f6cf5fb953d61\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Wed Jun 24 11:15:35 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c\nindex 1f21ccb55caa50..cbe681de381882 100644\n--- a/net/ipv6/addrconf.c\n+++ b/net/ipv6/addrconf.c\n@@ -913,7 +913,7 @@ static int addrconf_fixup_forwarding(const struct ctl_table *table, int *p, int\n \n \tif (newf)\n \t\trt6_purge_dflt_routers(net);\n-\treturn 1;\n+\treturn 0;\n }\n \n static void addrconf_linkdown_change(struct net *net, __s32 newf)\n@@ -955,11 +955,7 @@ static int addrconf_fixup_linkdown(const struct ctl_table *table, int *p, int ne\n \t\t\t\t\t\t     NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,\n \t\t\t\t\t\t     NETCONFA_IFINDEX_DEFAULT,\n \t\t\t\t\t\t     net-\u003eipv6.devconf_dflt);\n-\t\trtnl_net_unlock(net);\n-\t\treturn 0;\n-\t}\n-\n-\tif (p == \u0026net-\u003eipv6.devconf_all-\u003eignore_routes_with_linkdown) {\n+\t} else if (p == \u0026net-\u003eipv6.devconf_all-\u003eignore_routes_with_linkdown) {\n \t\tWRITE_ONCE(net-\u003eipv6.devconf_dflt-\u003eignore_routes_with_linkdown, newf);\n \t\taddrconf_linkdown_change(net, newf);\n \t\tif ((!newf) ^ (!old))\n@@ -968,11 +964,21 @@ static int addrconf_fixup_linkdown(const struct ctl_table *table, int *p, int ne\n \t\t\t\t\t\t     NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,\n \t\t\t\t\t\t     NETCONFA_IFINDEX_ALL,\n \t\t\t\t\t\t     net-\u003eipv6.devconf_all);\n+\t} else {\n+\t\tif (!newf ^ !old) {\n+\t\t\tstruct inet6_dev *idev = table-\u003eextra1;\n+\n+\t\t\tinet6_netconf_notify_devconf(net,\n+\t\t\t\t\t\t     RTM_NEWNETCONF,\n+\t\t\t\t\t\t     NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,\n+\t\t\t\t\t\t     idev-\u003edev-\u003eifindex,\n+\t\t\t\t\t\t     \u0026idev-\u003ecnf);\n+\t\t}\n \t}\n \n \trtnl_net_unlock(net);\n \n-\treturn 1;\n+\treturn 0;\n }\n \n #endif\n@@ -6370,6 +6376,8 @@ static int addrconf_sysctl_forward(const struct ctl_table *ctl, int write,\n \tlctl.data = \u0026val;\n \n \tret = proc_dointvec(\u0026lctl, write, buffer, lenp, ppos);\n+\tif (ret)\n+\t\treturn ret;\n \n \tif (write)\n \t\tret = addrconf_fixup_forwarding(ctl, valp, val);\n@@ -6467,6 +6475,8 @@ static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write,\n \tlctl.data = \u0026val;\n \n \tret = proc_dointvec(\u0026lctl, write, buffer, lenp, ppos);\n+\tif (ret)\n+\t\treturn ret;\n \n \tif (write)\n \t\tret = addrconf_disable_ipv6(ctl, valp, val);\n@@ -6478,20 +6488,19 @@ static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write,\n static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write,\n \t\tvoid *buffer, size_t *lenp, loff_t *ppos)\n {\n+\tstruct net *net = ctl-\u003eextra2;\n \tint *valp = ctl-\u003edata;\n-\tint ret;\n \tint old, new;\n+\tint ret;\n+\n+\tif (write \u0026\u0026 !rtnl_net_trylock(net))\n+\t\treturn restart_syscall();\n \n \told = *valp;\n \tret = proc_dointvec(ctl, write, buffer, lenp, ppos);\n \tnew = *valp;\n \n \tif (write \u0026\u0026 old != new) {\n-\t\tstruct net *net = ctl-\u003eextra2;\n-\n-\t\tif (!rtnl_net_trylock(net))\n-\t\t\treturn restart_syscall();\n-\n \t\tif (valp == \u0026net-\u003eipv6.devconf_dflt-\u003eproxy_ndp) {\n \t\t\tinet6_netconf_notify_devconf(net, RTM_NEWNETCONF,\n \t\t\t\t\t\t     NETCONFA_PROXY_NEIGH,\n@@ -6510,8 +6519,9 @@ static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write,\n \t\t\t\t\t\t     idev-\u003edev-\u003eifindex,\n \t\t\t\t\t\t     \u0026idev-\u003ecnf);\n \t\t}\n-\t\trtnl_net_unlock(net);\n \t}\n+\tif (write)\n+\t\trtnl_net_unlock(net);\n \n \treturn ret;\n }\n@@ -6669,6 +6679,8 @@ int addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table *ctl,\n \tlctl.data = \u0026val;\n \n \tret = proc_dointvec(\u0026lctl, write, buffer, lenp, ppos);\n+\tif (ret)\n+\t\treturn ret;\n \n \tif (write)\n \t\tret = addrconf_fixup_linkdown(ctl, valp, val);\n@@ -6763,6 +6775,8 @@ static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write\n \tlctl = *ctl;\n \tlctl.data = \u0026val;\n \tret = proc_dointvec(\u0026lctl, write, buffer, lenp, ppos);\n+\tif (ret)\n+\t\treturn ret;\n \n \tif (write \u0026\u0026 (*valp != val))\n \t\tret = addrconf_disable_policy(ctl, valp, val);\n"
}
2/1 2026/06/24 11:15 agent patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
{
  "EnableConfigs": [
    "IPV6"
  ],
  "FocusSymbols": [
    "addrconf_sysctl_forward",
    "addrconf_sysctl_disable",
    "addrconf_sysctl_proxy_ndp",
    "addrconf_sysctl_ignore_routes_with_linkdown",
    "addrconf_sysctl_disable_policy"
  ],
  "Reasoning": "The patch fixes several IPv6 sysctl handlers, including return values, locking, and missing netlink notifications. Fuzzing these sysctl handlers can help ensure the fixes are correct and don't introduce regressions.",
  "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).

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 098ca20002137b9e6db53bb2884f6cf5fb953d61
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Jun 24 11:15:35 2026 +0000

    syz-cluster: applied patch under review

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 1f21ccb55caa50..cbe681de381882 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -913,7 +913,7 @@ static int addrconf_fixup_forwarding(const struct ctl_table *table, int *p, int
 
 	if (newf)
 		rt6_purge_dflt_routers(net);
-	return 1;
+	return 0;
 }
 
 static void addrconf_linkdown_change(struct net *net, __s32 newf)
@@ -955,11 +955,7 @@ static int addrconf_fixup_linkdown(const struct ctl_table *table, int *p, int ne
 						     NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 						     NETCONFA_IFINDEX_DEFAULT,
 						     net->ipv6.devconf_dflt);
-		rtnl_net_unlock(net);
-		return 0;
-	}
-
-	if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
+	} else if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 		WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf);
 		addrconf_linkdown_change(net, newf);
 		if ((!newf) ^ (!old))
@@ -968,11 +964,21 @@ static int addrconf_fixup_linkdown(const struct ctl_table *table, int *p, int ne
 						     NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 						     NETCONFA_IFINDEX_ALL,
 						     net->ipv6.devconf_all);
+	} else {
+		if (!newf ^ !old) {
+			struct inet6_dev *idev = table->extra1;
+
+			inet6_netconf_notify_devconf(net,
+						     RTM_NEWNETCONF,
+						     NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
+						     idev->dev->ifindex,
+						     &idev->cnf);
+		}
 	}
 
 	rtnl_net_unlock(net);
 
-	return 1;
+	return 0;
 }
 
 #endif
@@ -6370,6 +6376,8 @@ static int addrconf_sysctl_forward(const struct ctl_table *ctl, int write,
 	lctl.data = &val;
 
 	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
+	if (ret)
+		return ret;
 
 	if (write)
 		ret = addrconf_fixup_forwarding(ctl, valp, val);
@@ -6467,6 +6475,8 @@ static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write,
 	lctl.data = &val;
 
 	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
+	if (ret)
+		return ret;
 
 	if (write)
 		ret = addrconf_disable_ipv6(ctl, valp, val);
@@ -6478,20 +6488,19 @@ static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write,
 static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write,
 		void *buffer, size_t *lenp, loff_t *ppos)
 {
+	struct net *net = ctl->extra2;
 	int *valp = ctl->data;
-	int ret;
 	int old, new;
+	int ret;
+
+	if (write && !rtnl_net_trylock(net))
+		return restart_syscall();
 
 	old = *valp;
 	ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
 	new = *valp;
 
 	if (write && old != new) {
-		struct net *net = ctl->extra2;
-
-		if (!rtnl_net_trylock(net))
-			return restart_syscall();
-
 		if (valp == &net->ipv6.devconf_dflt->proxy_ndp) {
 			inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 						     NETCONFA_PROXY_NEIGH,
@@ -6510,8 +6519,9 @@ static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write,
 						     idev->dev->ifindex,
 						     &idev->cnf);
 		}
-		rtnl_net_unlock(net);
 	}
+	if (write)
+		rtnl_net_unlock(net);
 
 	return ret;
 }
@@ -6669,6 +6679,8 @@ int addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table *ctl,
 	lctl.data = &val;
 
 	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
+	if (ret)
+		return ret;
 
 	if (write)
 		ret = addrconf_fixup_linkdown(ctl, valp, val);
@@ -6763,6 +6775,8 @@ static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write
 	lctl = *ctl;
 	lctl.data = &val;
 	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
+	if (ret)
+		return ret;
 
 	if (write && (*valp != val))
 		ret = addrconf_disable_policy(ctl, valp, val);

3/2 2026/06/24 11:15 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 3208
							output: 139
							thoughts: 1042

Thoughts: 
**Analysis of IPv6 addrconf.c Patch**

Okay, so this patch is digging into `net/ipv6/addrconf.c`, specifically around sysctl handlers. My initial thought is that it touches several critical functions: `addrconf_fixup_forwarding`, `addrconf_fixup_linkdown`, and then a handful of sysctl handlers – `addrconf_sysctl_forward`, `addrconf_sysctl_disable`, `addrconf_sysctl_proxy_ndp`, `addrconf_sysctl_ignore_routes_with_linkdown`, and `addrconf_sysctl_disable_policy`.

First, I see that the return values of `addrconf_fixup_forwarding` and `addrconf_fixup_linkdown` are being changed from 1 to 0. Hmm, those functions are called from some of the sysctl handlers. A return of 1 from a sysctl handler indicates an error, but in this case the sysctl handler returns 1 on success. That's a bit odd; that looks like a bug fix. The addition of `if (ret) return ret;` after `proc_dointvec` within those sysctl handlers seems to be enforcing this correct return behavior.

Next, I need to check the context for this – `net/ipv6/addrconf.c` is going to be relevant only with `CONFIG_IPV6` enabled. So that's my main configuration focus here.

Now, let's zoom in on `addrconf_sysctl_proxy_ndp`. The interesting change here is the move of `rtnl_net_trylock` *before* `proc_dointvec` when the write flag is true. This is a classic concurrency problem solved! `proc_dointvec` modifies `*valp`, and moving the lock before the modification prevents a race condition, specifically when a write operation is occurring. It protects the shared data being modified by `proc_dointvec`. Smart.

Functionally, these changes appear to be solid, correcting behavior and improving locking in the sysctl handlers. This definitely warrants fuzzing. The key focus symbols would be the ones I mentioned earlier: `addrconf_sysctl_forward`, `addrconf_sysctl_disable`, `addrconf_sysctl_proxy_ndp`, `addrconf_sysctl_ignore_routes_with_linkdown`, and `addrconf_sysctl_disable_policy`. And of course, the `IPV6` config needs to be enabled.

Finally, let's double-check the `addrconf_fixup_linkdown` change. There is an added notification for interface-specific `ignore_routes_with_linkdown` changes. Nice, a complete fix.

So, I'm going to set the results accordingly.
WorthFuzzing: true
FocusSymbols: `addrconf_sysctl_forward`, `addrconf_sysctl_disable`, `addrconf_sysctl_proxy_ndp`, `addrconf_sysctl_ignore_routes_with_linkdown`, `addrconf_sysctl_disable_policy`
EnableConfigs: `IPV6`
Reasoning: "The patch fixes several IPv6 sysctl handlers, including return values, locking, and missing netlink notifications. Fuzzing these sysctl handlers can help ensure the fixes are correct and don't introduce regressions."

4/2 2026/06/24 11:15 tool set-results
0m Args: 
{
  "EnableConfigs": [
    "IPV6"
  ],
  "FocusSymbols": [
    "addrconf_sysctl_forward",
    "addrconf_sysctl_disable",
    "addrconf_sysctl_proxy_ndp",
    "addrconf_sysctl_ignore_routes_with_linkdown",
    "addrconf_sysctl_disable_policy"
  ],
  "Reasoning": "The patch fixes several IPv6 sysctl handlers, including return values, locking, and missing netlink notifications. Fuzzing these sysctl handlers can help ensure the fixes are correct and don't introduce regressions.",
  "WorthFuzzing": true
}

Results: 
{
  "EnableConfigs": [
    "IPV6"
  ],
  "FocusSymbols": [
    "addrconf_sysctl_forward",
    "addrconf_sysctl_disable",
    "addrconf_sysctl_proxy_ndp",
    "addrconf_sysctl_ignore_routes_with_linkdown",
    "addrconf_sysctl_disable_policy"
  ],
  "Reasoning": "The patch fixes several IPv6 sysctl handlers, including return values, locking, and missing netlink notifications. Fuzzing these sysctl handlers can help ensure the fixes are correct and don't introduce regressions.",
  "WorthFuzzing": true
}
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)