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

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Message-ID: <000000000000a3f51805f8bcc43a@google.com>
Date:   Fri, 07 Apr 2023 03:48:40 -0700
From:   syzbot <syzbot+7e1e1bdb852961150198@...kaller.appspotmail.com>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] WARNING in cleanup_net (2)

Hello,

syzbot found the following issue on:

HEAD commit:    f33642224e38 ptp_qoriq: fix memory leak in probe()
git tree:       net
console+strace: https://syzkaller.appspot.com/x/log.txt?x=172977b1c80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ea09b0836073ee4
dashboard link: https://syzkaller.appspot.com/bug?extid=7e1e1bdb852961150198
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12d98a05c80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=170668b6c80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/78d8ce56ac20/disk-f3364222.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7b38fccf6cb4/vmlinux-f3364222.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9cbf8fd0a81b/bzImage-f3364222.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7e1e1bdb852961150198@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 75 at lib/ref_tracker.c:39 spin_unlock_irqrestore include/linux/spinlock.h:405 [inline]
WARNING: CPU: 0 PID: 75 at lib/ref_tracker.c:39 ref_tracker_dir_exit+0x3a2/0x600 lib/ref_tracker.c:38
Modules linked in:
CPU: 0 PID: 75 Comm: kworker/u4:4 Not tainted 6.3.0-rc3-syzkaller-00148-gf33642224e38 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Workqueue: netns cleanup_net
RIP: 0010:ref_tracker_dir_exit+0x3a2/0x600 lib/ref_tracker.c:39
Code: 0f 84 c3 fe ff ff e8 2d 3d 44 fd 44 89 ff e8 c5 f9 ff ff e9 b1 fe ff ff e8 1b 3d 44 fd 48 8b 74 24 10 4c 89 ef e8 de 99 c6 05 <0f> 0b e8 07 3d 44 fd 49 8d 6d 44 be 04 00 00 00 48 89 ef e8 e6 4e
RSP: 0018:ffffc90001577c00 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff888075d29ed0 R08: 0000000000000001 R09: ffffffff914d9c6f
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888075d29ed0
R13: ffff888075d29e80 R14: ffff888075d29ed0 R15: ffff88802879edc8
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff1bdf8960 CR3: 000000002bed0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 net_free net/core/net_namespace.c:447 [inline]
 net_free net/core/net_namespace.c:441 [inline]
 cleanup_net+0x8bb/0xb10 net/core/net_namespace.c:634
 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>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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