netdev - [syzbot] [net?] WARNING in xfrm_state

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Message-ID: <6888736f.a00a0220.b12ec.00ca.GAE@google.com>
Date: Tue, 29 Jul 2025 00:08:31 -0700
From: syzbot <syzbot+6641a61fe0e2e89ae8c5@...kaller.appspotmail.com>
To: davem@...emloft.net, edumazet@...gle.com, herbert@...dor.apana.org.au, 
	horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, pabeni@...hat.com, steffen.klassert@...unet.com, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] WARNING in xfrm_state_fini (3)

Hello,

syzbot found the following issue on:

HEAD commit:    038d61fd6422 Linux 6.16
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11b88cf0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4066f1c76cfbc4fe
dashboard link: https://syzkaller.appspot.com/bug?extid=6641a61fe0e2e89ae8c5
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16ca1782580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=140194a2580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6505c612be11/disk-038d61fd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e466ef29c1ca/vmlinux-038d61fd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b6d3d8fc5cbb/bzImage-038d61fd.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6641a61fe0e2e89ae8c5@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 36 at net/xfrm/xfrm_state.c:3284 xfrm_state_fini+0x270/0x2f0 net/xfrm/xfrm_state.c:3284
Modules linked in:
CPU: 1 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted 6.16.0-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: netns cleanup_net
RIP: 0010:xfrm_state_fini+0x270/0x2f0 net/xfrm/xfrm_state.c:3284
Code: c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 68 fa 0b f8 48 8b 3b 5b 41 5c 41 5d 41 5e 41 5f 5d e9 56 c8 ec f7 e8 51 e8 a9 f7 90 <0f> 0b 90 e9 fd fd ff ff e8 43 e8 a9 f7 90 0f 0b 90 e9 60 fe ff ff
RSP: 0018:ffffc90000ac7898 EFLAGS: 00010293
RAX: ffffffff8a163e8f RBX: ffff888034008000 RCX: ffff888143299e00
RDX: 0000000000000000 RSI: ffffffff8db8419f RDI: ffff888143299e00
RBP: ffffc90000ac79b0 R08: ffffffff8f6196e7 R09: 1ffffffff1ec32dc
R10: dffffc0000000000 R11: fffffbfff1ec32dd R12: ffffffff8f617760
R13: 1ffff92000158f40 R14: ffff8880340094c0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125d23000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbd9e960960 CR3: 00000000316d3000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 xfrm_net_exit+0x2d/0x70 net/xfrm/xfrm_policy.c:4348
 ops_exit_list net/core/net_namespace.c:200 [inline]
 ops_undo_list+0x49a/0x990 net/core/net_namespace.c:253
 cleanup_net+0x4c5/0x800 net/core/net_namespace.c:686
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
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If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
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If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
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#syz undup