linux-kernel - Re: possible deadlock in _snd_pcm_stream_lock

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Date:   Wed, 09 Sep 2020 10:33:04 -0700
From:   syzbot <syzbot+561a74f84100162990b2@...kaller.appspotmail.com>
To:     alsa-devel-owner@...a-project.org, alsa-devel@...a-project.org,
        arnd@...db.de, baolin.wang@...aro.org, boqun.feng@...il.com,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        paulhsia@...omium.org, perex@...ex.cz, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com, tiwai@...e.com, tiwai@...e.de,
        will@...nel.org
Subject: Re: possible deadlock in _snd_pcm_stream_lock_irqsave

syzbot has bisected this issue to:

commit e918188611f073063415f40fae568fa4d86d9044
Author: Boqun Feng <boqun.feng@...il.com>
Date:   Fri Aug 7 07:42:20 2020 +0000

    locking: More accurate annotations for read_lock()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=112dc243900000
start commit:   dff9f829 Add linux-next specific files for 20200908
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=132dc243900000
console output: https://syzkaller.appspot.com/x/log.txt?x=152dc243900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=37b3426c77bda44c
dashboard link: https://syzkaller.appspot.com/bug?extid=561a74f84100162990b2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1209e245900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=154b15ed900000

Reported-by: syzbot+561a74f84100162990b2@...kaller.appspotmail.com
Fixes: e918188611f0 ("locking: More accurate annotations for read_lock()")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection