linux-kernel - [syzbot] [net?] WARNING in xfrm_state

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Message-ID: <68ec1f21.050a0220.ac43.000f.GAE@google.com>
Date: Sun, 12 Oct 2025 14:35:29 -0700
From: syzbot <syzbot+999eb23467f83f9bf9bf@...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 (4)

Hello,

syzbot found the following issue on:

HEAD commit:    ffce84bccb4d Merge branch 'bpf-avoid-rcu-context-warning-w..
git tree:       bpf
console output: https://syzkaller.appspot.com/x/log.txt?x=112559e2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1e0e0bf7e51565cd
dashboard link: https://syzkaller.appspot.com/bug?extid=999eb23467f83f9bf9bf
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1514d304580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cd489c5f530a/disk-ffce84bc.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e4a06e8e5022/vmlinux-ffce84bc.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c1111b7581ab/bzImage-ffce84bc.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+999eb23467f83f9bf9bf@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 36 at net/xfrm/xfrm_state.c:3306 xfrm_state_fini+0x26d/0x2f0 net/xfrm/xfrm_state.c:3306
Modules linked in:
CPU: 1 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: netns cleanup_net
RIP: 0010:xfrm_state_fini+0x26d/0x2f0 net/xfrm/xfrm_state.c:3306
Code: c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 4b f0 36 f8 48 8b 3b 5b 41 5c 41 5d 41 5e 41 5f 5d e9 99 e1 16 f8 e8 64 4d d1 f7 90 <0f> 0b 90 e9 fd fd ff ff e8 56 4d d1 f7 90 0f 0b 90 e9 60 fe ff ff
RSP: 0018:ffffc90000ac7878 EFLAGS: 00010293
RAX: ffffffff89edd6ec RBX: ffff888058e08000 RCX: ffff88801ce99e40
RDX: 0000000000000000 RSI: ffffffff8d9cc7ae RDI: ffff88801ce99e40
RBP: ffffc90000ac7990 R08: ffffffff8f9db437 R09: 1ffffffff1f3b686
R10: dffffc0000000000 R11: fffffbfff1f3b687 R12: ffffffff8f5d4bc0
R13: 1ffff92000158f3c R14: ffff888058e094c0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125e27000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007eff78efa6b0 CR3: 000000007788c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 xfrm_net_exit+0x2d/0x70 net/xfrm/xfrm_policy.c:4354
 ops_exit_list net/core/net_namespace.c:199 [inline]
 ops_undo_list+0x497/0x990 net/core/net_namespace.c:252
 cleanup_net+0x4d8/0x820 net/core/net_namespace.c:695
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


---
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