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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: 105d, 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 2627d 2909d 11/29 fixed on 2019/03/06 07:43
upstream WARNING in xfrm6_tunnel_net_exit net -1 syz 14002 2914d 3044d 5/29 fixed on 2018/05/17 10:02
upstream WARNING in xfrm6_tunnel_net_exit (4) net -1 syz done inconclusive 25810 153d 206d 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 2334d 2583d 1/1 fixed on 2020/01/14 19:04

Sample crash report:
veth1_macvtap: left promiscuous mode
veth0_vlan: left promiscuous mode
------------[ cut here ]------------
WARNING: CPU: 0 PID: 379 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: 379 Comm: kworker/u8:4 Not tainted syzkaller #0 1a36ed5f0b44f46e7eaed3953ba11d0fea6dce7e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: netns cleanup_net
RIP: 0010:xfrm6_tunnel_net_exit+0xc4/0x140 net/ipv6/xfrm6_tunnel.c:341
Code: e8 a1 2b d9 fc 4b 83 3c 3e 00 75 19 e8 45 e6 80 fc 49 81 ff f8 07 00 00 74 1b e8 37 e6 80 fc 49 83 c7 08 eb c9 e8 2c e6 80 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:ffffc90001abfb90 EFLAGS: 00010293
RAX: ffffffff8506c684 RBX: ffff8881153711c0 RCX: ffff888131753900
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888114c9c000
RBP: ffffc90001abfbb0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000357f04 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888114c9c000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0a92348060 CR3: 000000011d09e000 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:3238 [inline]
 process_scheduled_works+0x7d1/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc70/0x10b0 kernel/workqueue.c:3400
 kthread+0x2c6/0x370 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: 379 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: 379 Comm: kworker/u8:4 Tainted: G        W          syzkaller #0 1a36ed5f0b44f46e7eaed3953ba11d0fea6dce7e
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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 f0 e5 80 fc 49 81 ff f8 07 00 00 74 1b e8 e2 e5 80 fc 49 83 c7 08 eb c5 e8 d7 e5 80 fc <0f> 0b 49 81 ff f8 07 00 00 75 e5 e8 c7 e5 80 fc 5b 41 5c 41 5e 41
RSP: 0018:ffffc90001abfb90 EFLAGS: 00010293
RAX: ffffffff8506c6d9 RBX: ffff888114c9c800 RCX: ffff888131753900
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888114c9c808
RBP: ffffc90001abfbb0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000357f04 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888114c9c000 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000001c0 CR3: 0000000121294000 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:3238 [inline]
 process_scheduled_works+0x7d1/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc70/0x10b0 kernel/workqueue.c:3400
 kthread+0x2c6/0x370 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: 379 at net/xfrm/xfrm_state.c:3216 xfrm_state_fini+0x2be/0x310 net/xfrm/xfrm_state.c:3216
Modules linked in:
CPU: 0 UID: 0 PID: 379 Comm: kworker/u8:4 Tainted: G        W          syzkaller #0 1a36ed5f0b44f46e7eaed3953ba11d0fea6dce7e
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: netns cleanup_net
RIP: 0010:xfrm_state_fini+0x2be/0x310 net/xfrm/xfrm_state.c:3216
Code: 3c 20 00 74 08 48 89 df e8 9f f7 f3 fc 48 8b 3b e8 37 17 df fc 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 32 b2 9b fc <0f> 0b e9 b0 fd ff ff e8 26 b2 9b fc 0f 0b e9 18 fe ff ff e8 1a b2
RSP: 0018:ffffc90001abfb70 EFLAGS: 00010293
RAX: ffffffff84ebfa7e RBX: ffff8881153711c0 RCX: ffff888131753900
RDX: 0000000000000000 RSI: 0000000000c00000 RDI: ffff888131753900
RBP: ffffc90001abfb98 R08: ffffffff87d38f47 R09: 1ffffffff0fa71e8
R10: dffffc0000000000 R11: fffffbfff0fa71e9 R12: 1ffffffff0fa6f38
R13: dffffc0000000000 R14: ffff888115371dc0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0a92348060 CR3: 0000000102326000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 xfrm_net_exit+0x31/0x80 net/xfrm/xfrm_policy.c:4342
 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:3238 [inline]
 process_scheduled_works+0x7d1/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc70/0x10b0 kernel/workqueue.c:3400
 kthread+0x2c6/0x370 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 (7054):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2026/05/06 20:28 android16-6.12 182d9bdc4d31 1dddfd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/06 19:22 android16-6.12 182d9bdc4d31 1dddfd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/06 17:22 android16-6.12 182d9bdc4d31 1dddfd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/06 16:03 android16-6.12 182d9bdc4d31 1dddfd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/06 15:29 android16-6.12 182d9bdc4d31 1dddfd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/06 13:19 android16-6.12 182d9bdc4d31 1dddfd3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/06 09:30 android16-6.12 59a61a07862b 26da2c66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/06 07:51 android16-6.12 59a61a07862b 26da2c66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/06 06:32 android16-6.12 59a61a07862b 26da2c66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/06 05:26 android16-6.12 59a61a07862b 26da2c66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/06 04:21 android16-6.12 59a61a07862b 26da2c66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/06 03:19 android16-6.12 59a61a07862b 26da2c66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/06 02:17 android16-6.12 59a61a07862b 26da2c66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/06 00:39 android16-6.12 59a61a07862b 26da2c66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/05 23:32 android16-6.12 59a61a07862b 26da2c66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/05 19:57 android16-6.12 fc365114731f 06e69a27 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/05 18:41 android16-6.12 fc365114731f 06e69a27 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/05 17:04 android16-6.12 fc365114731f 06e69a27 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/05 15:04 android16-6.12 fc365114731f 06e69a27 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/05 14:04 android16-6.12 fc365114731f 06e69a27 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/05 13:03 android16-6.12 fc365114731f 06e69a27 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/05 11:47 android16-6.12 fc365114731f 06e69a27 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/05 09:17 android16-6.12 fc365114731f 06e69a27 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/05 07:14 android16-6.12 ea1f41c3bdb9 a898ba9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/05 06:02 android16-6.12 ea1f41c3bdb9 a898ba9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/05 00:51 android16-6.12 ea1f41c3bdb9 a898ba9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/04 23:45 android16-6.12 ea1f41c3bdb9 a898ba9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/04 19:49 android16-6.12 ea1f41c3bdb9 a898ba9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/04 17:19 android16-6.12 ea1f41c3bdb9 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/04 17:19 android16-6.12 ea1f41c3bdb9 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/04 15:20 android16-6.12 8ed163f1fc8c 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/04 14:09 android16-6.12 8ed163f1fc8c 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/04 11:55 android16-6.12 8ed163f1fc8c 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/04 10:22 android16-6.12 8ed163f1fc8c 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/04 07:39 android16-6.12 8ed163f1fc8c 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/04 03:21 android16-6.12 8ed163f1fc8c a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/04 01:56 android16-6.12 8ed163f1fc8c a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/04 00:19 android16-6.12 8ed163f1fc8c a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/03 22:27 android16-6.12 8ed163f1fc8c a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/03 21:17 android16-6.12 8ed163f1fc8c a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/03 18:37 android16-6.12 8ed163f1fc8c a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/03 17:32 android16-6.12 8ed163f1fc8c a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/03 15:18 android16-6.12 8ed163f1fc8c a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/03 13:32 android16-6.12 8ed163f1fc8c a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in xfrm6_tunnel_net_exit
2026/05/03 11:28 android16-6.12 8ed163f1fc8c a0d91488 .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.