linux-kernel - Re: INFO: rcu detected stall in snd_pcm_oss

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Message-ID: <s5hin93gu2x.wl-tiwai@suse.de>
Date:   Sat, 07 Apr 2018 13:00:06 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+150189c103427d31a053@...kaller.appspotmail.com>,
        alsa-devel@...a-project.org, Victor Chibotaru <tchibo@...gle.com>,
        syzkaller-bugs@...glegroups.com,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Sakamoto <o-takashi@...amocchi.jp>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: Re: INFO: rcu detected stall in snd_pcm_oss_write3 (2)

On Sat, 07 Apr 2018 12:19:33 +0200,
Dmitry Vyukov wrote:
> 
> On Sat, Apr 7, 2018 at 11:56 AM, Takashi Iwai <tiwai@...e.de> wrote:
> > On Fri, 06 Apr 2018 23:14:01 +0200,
> > syzbot wrote:
> >>
> >> syzbot has found reproducer for the following crash on upstream commit
> >> 38c23685b273cfb4ccf31a199feccce3bdcb5d83 (Fri Apr 6 04:29:35 2018 +0000)
> >> Merge tag 'armsoc-drivers' of
> >> git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
> >> syzbot dashboard link:
> >> https://syzkaller.appspot.com/bug?extid=150189c103427d31a053
> >>
> >> So far this crash happened 15 times on upstream.
> >> C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5405588854931456
> >> syzkaller reproducer:
> >> https://syzkaller.appspot.com/x/repro.syz?id=5561439796330496
> >> Raw console output:
> >> https://syzkaller.appspot.com/x/log.txt?id=5697900571000832
> >> Kernel config:
> >> https://syzkaller.appspot.com/x/.config?id=-5813481738265533882
> >> compiler: gcc (GCC) 8.0.1 20180301 (experimental)
> >
> > Thanks to the reproducer, I could spot out now.
> > Below is the patch (which was submitted as well).
> 
> Great!
> 
> There are 3 more recent stalls in sound, does this fix them as well?
> 
> https://groups.google.com/forum/#!msg/syzkaller-bugs/MGfk8WH3O6k/ja2xKpdcCAAJ
> https://groups.google.com/forum/#!msg/syzkaller-bugs/74HglwU94go/T89ohzlYCAAJ
> https://groups.google.com/forum/#!msg/syzkaller-bugs/D2xWV7WTRDk/5y2kZyBICAAJ

Yes, very likely.


Takashi