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

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Message-ID: <68888ebe.a70a0220.13df61.0001.GAE@google.com>
Date: Tue, 29 Jul 2025 02:05:02 -0700
From: syzbot <syzbot+6641a61fe0e2e89ae8c5@...kaller.appspotmail.com>
To: hdanton@...a.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING in xfrm_state_fini (3)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in xfrm_state_fini

------------[ cut here ]------------
WARNING: CPU: 1 PID: 1084 at net/xfrm/xfrm_state.c:3293 xfrm_state_fini+0x270/0x2f0 net/xfrm/xfrm_state.c:3293
Modules linked in:
CPU: 1 UID: 0 PID: 1084 Comm: kworker/u8:6 Not tainted 6.16.0-syzkaller-g86aa72182095-dirty #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:3293
Code: c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 18 dd 09 f8 48 8b 3b 5b 41 5c 41 5d 41 5e 41 5f 5d e9 06 ab ea f7 e8 31 c4 a7 f7 90 <0f> 0b 90 e9 fd fd ff ff e8 23 c4 a7 f7 90 0f 0b 90 e9 60 fe ff ff
RSP: 0018:ffffc90003a8f898 EFLAGS: 00010293
RAX: ffffffff8a17909f RBX: ffff888035c00000 RCX: ffff888026f79e00
RDX: 0000000000000000 RSI: ffffffff8db5f1fd RDI: ffff888026f79e00
RBP: ffffc90003a8f9b0 R08: ffffffff8f6025e7 R09: 1ffffffff1ec04bc
R10: dffffc0000000000 R11: fffffbfff1ec04bd R12: ffffffff8f600660
R13: 1ffff92000751f40 R14: ffff888035c014c0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125d86000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efd65a94e9c CR3: 0000000031b09000 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>


Tested on:

commit:         86aa7218 Merge tag 'chrome-platform-v6.17' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=100531bc580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6aef71a615d0cdf2
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
patch:          https://syzkaller.appspot.com/x/patch.diff?x=16798cf0580000