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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: 175d, last: 26m
▶ ▼ 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 C 48816 2697d 2979d 11/29 fixed on 2019/03/06 07:43
upstream WARNING in xfrm6_tunnel_net_exit net -1 syz 14002 2984d 3114d 5/29 fixed on 2018/05/17 10:02
upstream WARNING in xfrm6_tunnel_net_exit (4) net -1 syz done inconclusive 25810 223d 275d 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 2404d 2652d 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 7d836c68f7d55d9b8be32a3afed0c3f02dc2df9e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: netns cleanup_net
RIP: 0010:xfrm6_tunnel_net_exit+0xc4/0x140 net/ipv6/xfrm6_tunnel.c:341
Code: e8 11 01 d7 fc 4b 83 3c 3e 00 75 19 e8 a5 4d 7e fc 49 81 ff f8 07 00 00 74 1b e8 97 4d 7e fc 49 83 c7 08 eb c9 e8 8c 4d 7e 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: ffffffff85092464 RBX: ffff8881243911c0 RCX: ffff88810ae4df00
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88810e3680b8
RBP: ffffc900002ffbb0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200005ff04 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88810e368000 R15: 00000000000000b8
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efd90e73780 CR3: 00000001227c0000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x6bd/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: 1 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: 1 UID: 0 PID: 46 Comm: kworker/u8:2 Tainted: G        W          syzkaller #0 7d836c68f7d55d9b8be32a3afed0c3f02dc2df9e
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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 50 4d 7e fc 49 81 ff f8 07 00 00 74 1b e8 42 4d 7e fc 49 83 c7 08 eb c5 e8 37 4d 7e fc <0f> 0b 49 81 ff f8 07 00 00 75 e5 e8 27 4d 7e fc 5b 41 5c 41 5e 41
RSP: 0018:ffffc900002ffb90 EFLAGS: 00010293
RAX: ffffffff850924b9 RBX: ffff88810e368800 RCX: ffff88810ae4df00
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88810e368808
RBP: ffffc900002ffbb0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200005ff04 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88810e368000 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe1be56de0 CR3: 0000000130db2000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x6bd/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:3217 xfrm_state_fini+0x2be/0x310 net/xfrm/xfrm_state.c:3217
Modules linked in:
CPU: 0 UID: 0 PID: 46 Comm: kworker/u8:2 Tainted: G        W          syzkaller #0 7d836c68f7d55d9b8be32a3afed0c3f02dc2df9e
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: netns cleanup_net
RIP: 0010:xfrm_state_fini+0x2be/0x310 net/xfrm/xfrm_state.c:3217
Code: 3c 20 00 74 08 48 89 df e8 ff c0 f1 fc 48 8b 3b e8 17 b2 dc fc 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 82 0d 99 fc <0f> 0b e9 b0 fd ff ff e8 76 0d 99 fc 0f 0b e9 18 fe ff ff e8 6a 0d
RSP: 0018:ffffc900002ffb70 EFLAGS: 00010293
RAX: ffffffff84ee646e RBX: ffff8881243911c0 RCX: ffff88810ae4df00
RDX: 0000000000000000 RSI: 0000000000400000 RDI: ffff88810ae4df00
RBP: ffffc900002ffb98 R08: ffffffff87d41aa7 R09: 1ffffffff0fa8354
R10: dffffc0000000000 R11: fffffbfff0fa8355 R12: 1ffffffff0fa80a8
R13: dffffc0000000000 R14: ffff888124391dc0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efd911ed2f8 CR3: 000000010c7f2000 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+0x6bd/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 (10508):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2026/07/15 14:45 android16-6.12 a123382dbca7 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/15 13:21 android16-6.12 a123382dbca7 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/15 12:54 android16-6.12 a123382dbca7 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/15 11:43 android16-6.12 a123382dbca7 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/15 10:40 android16-6.12 a123382dbca7 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/15 08:54 android16-6.12 5dd528d5e93a a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/15 07:24 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/15 06:35 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/15 05:34 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/15 03:45 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/15 01:59 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/15 00:34 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 22:57 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 22:24 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 21:21 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 20:07 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 18:53 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 16:15 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 15:01 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 13:47 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 12:42 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 10:38 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 06:29 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 05:05 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 03:06 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/14 01:41 android16-6.12 5dd528d5e93a 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/13 23:12 android16-6.12 0afba8617d63 cc4833d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/13 20:33 android16-6.12 0afba8617d63 cc4833d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/13 18:44 android16-6.12 0afba8617d63 cc4833d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/13 14:17 android16-6.12 0afba8617d63 cc4833d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/13 12:29 android16-6.12 0afba8617d63 cc4833d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/13 12:21 android16-6.12 0afba8617d63 cc4833d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/13 10:47 android16-6.12 0afba8617d63 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/13 09:12 android16-6.12 0afba8617d63 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/13 06:12 android16-6.12 0026e4ecedf0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/13 03:30 android16-6.12 0026e4ecedf0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/12 22:33 android16-6.12 0026e4ecedf0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/12 20:05 android16-6.12 0026e4ecedf0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/12 19:09 android16-6.12 0026e4ecedf0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/12 17:37 android16-6.12 0026e4ecedf0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/12 16:30 android16-6.12 0026e4ecedf0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/12 14:41 android16-6.12 0026e4ecedf0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/07/12 12:39 android16-6.12 0026e4ecedf0 d78ea535 .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.