Messages in this thread | | | Date | Tue, 20 Jul 2021 14:29:08 +0300 | From | Pavel Skripkin <> | Subject | Re: [syzbot] WARNING in pwq_unbound_release_workfn (2) |
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On Mon, 19 Jul 2021 17:55:20 -0700 syzbot <syzbot+d04950c1e97f51d0068a@syzkaller.appspotmail.com> wrote:
> 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
I think, this should be fixed by:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a9a2e0482d647b07b4d45033f4be0854d3ea201e
Unfortunately, syzbot didn't provide any reproducer, so no chance to test it :(
With regards, Pavel Skripkin
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