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

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Date:   Tue, 11 Apr 2023 17:22:53 -0700
From:   syzbot <syzbot+b3346cca0c23c839e787@...kaller.appspotmail.com>
To:     davem@...emloft.net, edumazet@...gle.com,
        herbert@...dor.apana.org.au, 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_policy_fini (2)

Hello,

syzbot found the following issue on:

HEAD commit:    e28531143b25 net: ethernet: mtk_eth_soc: mtk_ppe: prefer n..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=163c0ac5c80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a3bc1f699d6e9cb0
dashboard link: https://syzkaller.appspot.com/bug?extid=b3346cca0c23c839e787
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6ff439efecb6/disk-e2853114.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/280d508d228c/vmlinux-e2853114.xz
kernel image: https://storage.googleapis.com/syzbot-assets/af98eb5ab0e4/bzImage-e2853114.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b3346cca0c23c839e787@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 41 at net/xfrm/xfrm_policy.c:4176 xfrm_policy_fini+0x2f2/0x3c0 net/xfrm/xfrm_policy.c:4176
Modules linked in:
CPU: 0 PID: 41 Comm: kworker/u4:2 Not tainted 6.3.0-rc5-syzkaller-01242-ge28531143b25 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Workqueue: netns cleanup_net
RIP: 0010:xfrm_policy_fini+0x2f2/0x3c0 net/xfrm/xfrm_policy.c:4176
Code: cd f8 0f 0b 8b 74 24 04 e9 56 fe ff ff e8 a6 a1 cd f8 0f 0b e9 e1 fd ff ff e8 9a a1 cd f8 0f 0b e9 02 ff ff ff e8 8e a1 cd f8 <0f> 0b e9 76 fd ff ff e8 d2 ea 1e f9 e9 8d fe ff ff 48 89 ef e8 e5
RSP: 0018:ffffc90000b27bd8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88807945b980 RCX: 0000000000000000
RDX: ffff8880177b57c0 RSI: ffffffff88b53632 RDI: 0000000000000000
RBP: ffff88807945cd00 R08: 0000000000000001 R09: ffffffff914e0b8f
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8e28cb40
R13: ffffc90000b27ca0 R14: dffffc0000000000 R15: fffffbfff1c5196c
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f60f8cb7378 CR3: 000000000c571000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 xfrm_net_exit+0x1d/0x60 net/xfrm/xfrm_policy.c:4240
 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169
 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:613
 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390
 worker_thread+0x669/0x1090 kernel/workqueue.c:2537
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>


---
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