WARNING in xfrm6_tunnel_net_exit

Status: premoderation: reported syz repro on 2026/01/21 06:13
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+e1732515a139c4a501f1@syzkaller.appspotmail.com
First crash: 280d, last: 38m
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2026/02/01 android16-6.12 (ToT) c13babfee861 syz [report] WARNING in xfrm6_tunnel_net_exit
2026/02/01 lts (merge base) 0bf1a02494c7 syz Didn't crash
2026/02/15 upstream (ToT) ca4ee40bf13d syz Didn't crash
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in xfrm6_tunnel_net_exit (2) net -1 syz, C 48816 2802d 3083d 11/29 fixed on 2019/03/06 07:43
upstream WARNING in xfrm6_tunnel_net_exit net -1 syz 14002 3088d 3218d 5/29 fixed on 2018/05/17 10:02
upstream WARNING in xfrm6_tunnel_net_exit (4) net -1 syz done inconclusive 25810 328d 380d 0/29 auto-obsoleted due to no activity on 2026/03/14 09:44
linux-4.19 WARNING in xfrm6_tunnel_net_exit -1 syz done 34 2508d 2757d 1/1 fixed on 2020/01/14 19:04

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 46 at net/ipv6/xfrm6_tunnel.c:341 xfrm6_tunnel_net_exit+0xc4/0x140 net/ipv6/xfrm6_tunnel.c:341
Modules linked in:
CPU: 0 UID: 0 PID: 46 Comm: kworker/u8:2 Not tainted syzkaller #0 f2e3546bd5cd9c2c62fe243d57d118fc828de9da
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: netns cleanup_net
RIP: 0010:xfrm6_tunnel_net_exit+0xc4/0x140 net/ipv6/xfrm6_tunnel.c:341
Code: e8 91 25 d5 fc 4b 83 3c 3e 00 75 19 e8 05 b0 7b fc 49 81 ff f8 07 00 00 74 1b e8 f7 af 7b fc 49 83 c7 08 eb c9 e8 ec af 7b fc <0f> 0b 49 81 ff f8 07 00 00 75 e5 49 8d 9e 00 08 00 00 45 31 ff 4a
RSP: 0018:ffffc900002ffb90 EFLAGS: 00010293
RAX: ffffffff850d9cd4 RBX: ffff88811518c700 RCX: ffff88810524bb40
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88811970c7e0
RBP: ffffc900002ffbb0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200005ff04 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88811970c000 R15: 00000000000007e0
FS:  0000000000000000(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbd22fee300 CR3: 0000000105bde000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x6ba/0xc90 net/core/net_namespace.c:642
 process_one_work kernel/workqueue.c:3273 [inline]
 process_scheduled_works+0x7f7/0x1060 kernel/workqueue.c:3354
 worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435
 kthread+0x2c7/0x360 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 46 at net/ipv6/xfrm6_tunnel.c:344 xfrm6_tunnel_net_exit+0x119/0x140 net/ipv6/xfrm6_tunnel.c:344
Modules linked in:
CPU: 0 UID: 0 PID: 46 Comm: kworker/u8:2 Tainted: G        W          syzkaller #0 f2e3546bd5cd9c2c62fe243d57d118fc828de9da
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: netns cleanup_net
RIP: 0010:xfrm6_tunnel_net_exit+0x119/0x140 net/ipv6/xfrm6_tunnel.c:344
Code: fc 4b 83 bc 3e 00 08 00 00 00 75 19 e8 b0 af 7b fc 49 81 ff f8 07 00 00 74 1b e8 a2 af 7b fc 49 83 c7 08 eb c5 e8 97 af 7b fc <0f> 0b 49 81 ff f8 07 00 00 75 e5 e8 87 af 7b fc 5b 41 5c 41 5e 41
RSP: 0018:ffffc900002ffb90 EFLAGS: 00010293
RAX: ffffffff850d9d29 RBX: ffff88811970c800 RCX: ffff88810524bb40
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88811970c808
RBP: ffffc900002ffbb0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200005ff04 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88811970c000 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbd22fee300 CR3: 000000010cb18000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x6ba/0xc90 net/core/net_namespace.c:642
 process_one_work kernel/workqueue.c:3273 [inline]
 process_scheduled_works+0x7f7/0x1060 kernel/workqueue.c:3354
 worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435
 kthread+0x2c7/0x360 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 46 at net/xfrm/xfrm_state.c:3230 xfrm_state_fini+0x2be/0x310 net/xfrm/xfrm_state.c:3230
Modules linked in:
CPU: 0 UID: 0 PID: 46 Comm: kworker/u8:2 Tainted: G        W          syzkaller #0 f2e3546bd5cd9c2c62fe243d57d118fc828de9da
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: netns cleanup_net
RIP: 0010:xfrm_state_fini+0x2be/0x310 net/xfrm/xfrm_state.c:3230
Code: 3c 20 00 74 08 48 89 df e8 af f8 ef fc 48 8b 3b e8 e7 e8 da fc 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 12 83 96 fc <0f> 0b e9 b0 fd ff ff e8 06 83 96 fc 0f 0b e9 18 fe ff ff e8 fa 82
RSP: 0018:ffffc900002ffb70 EFLAGS: 00010293
RAX: ffffffff84f2c9ae RBX: ffff88811518c700 RCX: ffff88810524bb40
RDX: 0000000000000000 RSI: 0000000000400000 RDI: ffff88810524bb40
RBP: ffffc900002ffb98 R08: ffffffff8854ae47 R09: 1ffffffff10a95c8
R10: dffffc0000000000 R11: fffffbfff10a95c9 R12: 1ffffffff10a931c
R13: dffffc0000000000 R14: ffff88811518d300 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbd22fee300 CR3: 000000010cb18000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 xfrm_net_exit+0x31/0x80 net/xfrm/xfrm_policy.c:4353
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x6ba/0xc90 net/core/net_namespace.c:642
 process_one_work kernel/workqueue.c:3273 [inline]
 process_scheduled_works+0x7f7/0x1060 kernel/workqueue.c:3354
 worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435
 kthread+0x2c7/0x360 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
---[ end trace 0000000000000000 ]---

Crashes (15526):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/14 02:08 android16-6.12 ffba6317c672 7321cd29 .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/29 08:58 android16-6.12 da245f6c05a1 7bf4ea23 .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/24 18:50 android16-6.12 41c3d4eb44a7 dd737a83 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/12 20:52 android16-6.12 0026e4ecedf0 d78ea535 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/06/30 20:54 android16-6.12 529c9d587ac1 00e8b0fd .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/25 13:10 android16-6.12 28ab3740535f c69befb3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/16 19:46 android16-6.12 be343ff665e2 a15a64a6 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/04/22 01:13 android16-6.12 0c9c20447f96 0b6ab7ec .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/04/19 14:19 android16-6.12 6532ca3bb1f7 303e2802 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/04/14 09:22 android16-6.12 6642375b48be 1a086e7c .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/03/23 13:23 android16-6.12 037660b116cb 4933dba2 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/03/20 05:58 android16-6.12 60fb2b8a235f 2f245add .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/02/07 12:39 android16-6.12 6aeca23b5dee f20fc9f9 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/02/05 14:39 android16-6.12 c895831740a4 4936e85c .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/02/01 03:30 android16-6.12 c13babfee861 6b8752f2 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/28 05:23 android16-6.12 4db94d79f511 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/28 03:20 android16-6.12 4db94d79f511 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/28 01:49 android16-6.12 4db94d79f511 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/28 01:21 android16-6.12 4db94d79f511 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/28 00:16 android16-6.12 4db94d79f511 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/27 21:59 android16-6.12 4db94d79f511 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/27 20:51 android16-6.12 4db94d79f511 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/27 18:50 android16-6.12 4db94d79f511 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/27 15:00 android16-6.12 3b7cac078605 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/27 13:27 android16-6.12 3b7cac078605 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/27 12:17 android16-6.12 3b7cac078605 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/27 10:25 android16-6.12 3b7cac078605 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/27 09:52 android16-6.12 3b7cac078605 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/27 08:41 android16-6.12 3b7cac078605 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/27 06:13 android16-6.12 3b7cac078605 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/27 03:27 android16-6.12 e9c13b0731b0 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/27 02:18 android16-6.12 e9c13b0731b0 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 21:14 android16-6.12 e9c13b0731b0 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 20:03 android16-6.12 e9c13b0731b0 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 18:57 android16-6.12 e9c13b0731b0 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 17:55 android16-6.12 e9c13b0731b0 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 13:50 android16-6.12 8667f8e26c47 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 11:03 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 09:50 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 07:45 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 06:44 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 05:27 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 04:23 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 03:05 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 01:38 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/26 00:26 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/25 23:47 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/25 22:19 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/25 18:40 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/25 16:21 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/25 12:46 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/25 11:20 android16-6.12 8667f8e26c47 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/25 09:37 android16-6.12 32521e28daaa 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/25 08:31 android16-6.12 32521e28daaa 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/25 07:31 android16-6.12 32521e28daaa 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/25 05:43 android16-6.12 32521e28daaa 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/25 04:36 android16-6.12 32521e28daaa 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/25 01:19 android16-6.12 32521e28daaa 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/10/25 00:47 android16-6.12 32521e28daaa 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/27 06:55 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
* Struck through repros no longer work on HEAD.