linux-kernel - Re: WARNING: lock held when returning to user space! (3)

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Message-ID: <CACT4Y+aJSrvgdRGG6eQ3Xi_JqtHo56k5Gx7Qnt3mFf+mFneR=g@mail.gmail.com>
Date:   Wed, 2 Jan 2019 12:24:07 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+42e36e1ae3de3f22a7ed@...kaller.appspotmail.com>,
        maarten.lankhorst@...ux.intel.com, maxime.ripard@...tlin.com,
        sean@...rly.run, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        DRI <dri-devel@...ts.freedesktop.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: WARNING: lock held when returning to user space! (3)

On Wed, Jan 2, 2019 at 11:59 AM syzbot
<syzbot+42e36e1ae3de3f22a7ed@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    903b77c63167 Merge tag 'linux-kselftest-4.21-rc1' of git:/..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1424673b400000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=53a2f2aa0b1f7606
> dashboard link: https://syzkaller.appspot.com/bug?extid=42e36e1ae3de3f22a7ed
> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1453eabf400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14a492bf400000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+42e36e1ae3de3f22a7ed@...kaller.appspotmail.com

#syz dup: WARNING: lock held when returning to user space in set_property_atomic

> RBP: 00000000006cf018 R08: 0000000000000001 R09: 0000000000000032
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
> R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000
>
> ================================================
> WARNING: lock held when returning to user space!
> 4.20.0+ #395 Not tainted
> ------------------------------------------------
> syz-executor520/8085 is leaving the kernel with locks still held!
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
> syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>
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