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Date:   Mon, 19 Jul 2021 17:55:20 -0700
Message-ID: <00000000000015c36505c78382e0@google.com>
Subject: [syzbot] WARNING in pwq_unbound_release_workfn (2)
From:   syzbot <syzbot+d04950c1e97f51d0068a@syzkaller.appspotmail.com>
To:     boqun.feng@gmail.com, linux-kernel@vger.kernel.org,
        longman@redhat.com, mingo@redhat.com, peterz@infradead.org,
        syzkaller-bugs@googlegroups.com, will@kernel.org
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Hello,

syzbot found the following issue on:

HEAD commit:    2734d6c1b1a0 Linux 5.14-rc2
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1518d3bc300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f7dfeb6dfc05ea19
dashboard link: https://syzkaller.appspot.com/bug?extid=d04950c1e97f51d0068a

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d04950c1e97f51d0068a@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 3 PID: 32 at kernel/locking/lockdep.c:6305 lockdep_unregister_key+0x19a/0x250 kernel/locking/lockdep.c:6305
Modules linked in:
CPU: 3 PID: 32 Comm: kworker/3:0 Not tainted 5.14.0-rc2-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: events pwq_unbound_release_workfn
RIP: 0010:lockdep_unregister_key+0x19a/0x250 kernel/locking/lockdep.c:6305
Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 8f 00 00 00 4d 89 7d 08 48 b8 22 01 00 00 00 00 ad de 48 89 43 08 eb 02 <0f> 0b 4c 89 f7 ba 01 00 00 00 48 89 ee e8 44 fd ff ff 4c 89 f7 e8
RSP: 0018:ffffc900007bfcb0 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffffffff1ad87cd
RDX: 1ffffffff1fcad55 RSI: 0000000000000004 RDI: ffffffff8fe56aa8
RBP: ffff88801416e928 R08: 0000000000000001 R09: 0000000000000003
R10: fffff520000f7f8c R11: 0000000000086088 R12: 0000000000000246
R13: dffffc0000000000 R14: ffffffff8fcd1868 R15: ffff888047033870
FS:  0000000000000000(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000014a53ad CR3: 00000000479f1000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 wq_unregister_lockdep kernel/workqueue.c:3468 [inline]
 pwq_unbound_release_workfn+0x223/0x2d0 kernel/workqueue.c:3700
 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295


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