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: 232d, last: 2h25m
▶ ▼ 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 2754d 3036d 11/29 fixed on 2019/03/06 07:43
upstream WARNING in xfrm6_tunnel_net_exit net -1 syz 14002 3040d 3171d 5/29 fixed on 2018/05/17 10:02
upstream WARNING in xfrm6_tunnel_net_exit (4) net -1 syz done inconclusive 25810 280d 332d 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 2461d 2709d 1/1 fixed on 2020/01/14 19:04

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 13 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: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 f10dc98c92500eb86b2a5bf5b389293121b4eb86
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: netns cleanup_net
RIP: 0010:xfrm6_tunnel_net_exit+0xc4/0x140 net/ipv6/xfrm6_tunnel.c:341
Code: e8 a1 f3 d6 fc 4b 83 3c 3e 00 75 19 e8 35 42 7e fc 49 81 ff f8 07 00 00 74 1b e8 27 42 7e fc 49 83 c7 08 eb c9 e8 1c 42 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:ffffc900000d7b90 EFLAGS: 00010293
RAX: ffffffff85093184 RBX: ffff888114e42380 RCX: ffff888103652600
RDX: 0000000000000000 RSI: 0000000000c00000 RDI: ffff888115034580
RBP: ffffc900000d7bb0 R08: ffffffff87d41e27 R09: 1ffffffff0fa83c4
R10: dffffc0000000000 R11: fffffbfff0fa83c5 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888115034000 R15: 0000000000000580
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557fa8b918 CR3: 00000000074aa000 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: 13 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: 13 Comm: kworker/u8:1 Tainted: G        W          syzkaller #0 f10dc98c92500eb86b2a5bf5b389293121b4eb86
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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 e0 41 7e fc 49 81 ff f8 07 00 00 74 1b e8 d2 41 7e fc 49 83 c7 08 eb c5 e8 c7 41 7e fc <0f> 0b 49 81 ff f8 07 00 00 75 e5 e8 b7 41 7e fc 5b 41 5c 41 5e 41
RSP: 0018:ffffc900000d7b90 EFLAGS: 00010293
RAX: ffffffff850931d9 RBX: ffff888115034800 RCX: ffff888103652600
RDX: 0000000000000000 RSI: 0000000000c00000 RDI: ffff888115034808
RBP: ffffc900000d7bb0 R08: ffffffff87d41e27 R09: 1ffffffff0fa83c4
R10: dffffc0000000000 R11: fffffbfff0fa83c5 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888115034000 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557fa8b918 CR3: 00000000074aa000 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: 13 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: 13 Comm: kworker/u8:1 Tainted: G        W          syzkaller #0 f10dc98c92500eb86b2a5bf5b389293121b4eb86
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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 df b1 f1 fc 48 8b 3b e8 f7 a4 dc fc 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 62 00 99 fc <0f> 0b e9 b0 fd ff ff e8 56 00 99 fc 0f 0b e9 18 fe ff ff e8 4a 00
RSP: 0018:ffffc900000d7b70 EFLAGS: 00010293
RAX: ffffffff84ee733e RBX: ffff888114e42380 RCX: ffff888103652600
RDX: 0000000000000000 RSI: 0000000000c00000 RDI: ffff888103652600
RBP: ffffc900000d7b98 R08: ffffffff87d41e27 R09: 1ffffffff0fa83c4
R10: dffffc0000000000 R11: fffffbfff0fa83c5 R12: 1ffffffff0fa8118
R13: dffffc0000000000 R14: ffff888114e42f80 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557fa8b918 CR3: 000000011fc76000 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 (13730):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2026/09/10 11:17 android16-6.12 89698cd757af 1fe56c0a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/10 10:00 android16-6.12 89698cd757af 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/10 07:16 android16-6.12 89698cd757af 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/10 06:01 android16-6.12 89698cd757af 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/10 03:58 android16-6.12 89698cd757af 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/10 02:35 android16-6.12 89698cd757af 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/10 01:05 android16-6.12 89698cd757af 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 23:33 android16-6.12 89698cd757af 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 22:23 android16-6.12 89698cd757af 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 22:15 android16-6.12 89698cd757af 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 20:16 android16-6.12 89698cd757af 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 19:08 android16-6.12 89698cd757af 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 16:53 android16-6.12 d768b2f486b5 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 15:36 android16-6.12 d768b2f486b5 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 13:46 android16-6.12 d768b2f486b5 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 13:46 android16-6.12 d768b2f486b5 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 12:16 android16-6.12 d768b2f486b5 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 09:32 android16-6.12 d768b2f486b5 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 07:17 android16-6.12 d768b2f486b5 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 05:47 android16-6.12 d768b2f486b5 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 03:27 android16-6.12 136b3cf43ec1 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 02:13 android16-6.12 136b3cf43ec1 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/09 01:02 android16-6.12 136b3cf43ec1 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/08 23:54 android16-6.12 136b3cf43ec1 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/08 22:09 android16-6.12 136b3cf43ec1 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/08 21:06 android16-6.12 136b3cf43ec1 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/08 20:02 android16-6.12 136b3cf43ec1 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/08 18:49 android16-6.12 136b3cf43ec1 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/08 16:53 android16-6.12 136b3cf43ec1 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/08 15:03 android16-6.12 136b3cf43ec1 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/08 08:03 android16-6.12 e0485c4d49da 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/08 06:41 android16-6.12 e0485c4d49da 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/08 03:56 android16-6.12 e0485c4d49da 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/07 23:54 android16-6.12 e0485c4d49da 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/07 22:41 android16-6.12 e0485c4d49da 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/07 20:13 android16-6.12 e0485c4d49da 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/07 18:32 android16-6.12 e0485c4d49da 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/07 16:17 android16-6.12 e0485c4d49da 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/07 12:29 android16-6.12 e0485c4d49da 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/07 10:19 android16-6.12 e0485c4d49da 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/07 09:21 android16-6.12 4e585dd7f3b7 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/07 07:08 android16-6.12 4e585dd7f3b7 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/07 05:27 android16-6.12 4e585dd7f3b7 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/09/07 04:00 android16-6.12 4e585dd7f3b7 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/08/30 06:59 android16-6.12 36bee94a7cf9 2f52988a .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.