linux-kernel - Re: sound: divide by 0 in snd_hrtimer

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Date:   Tue, 06 Sep 2016 18:10:30 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Vegard Nossum <vegard.nossum@...il.com>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Kangjie Lu <kangjielu@...il.com>, alsa-devel@...a-project.org,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: sound: divide by 0 in snd_hrtimer_callback (or hang)

On Tue, 06 Sep 2016 16:06:08 +0200,
Dmitry Vyukov wrote:
> 
> > Do you really see the zero-division error with sticks=1 fix?  That's
> > unexpected.
> 
> Yes, just reproduced it again.
> I am on 0693c28cfc8e25f18c25b65a8942c026f1854a3c of linux-next now, so
> I already have:
>     commit 6b760bb2c63a9e322c0e4a0b5daf335ad93d5a33
>     ALSA: timer: fix division by zero after SNDRV_TIMER_IOCTL_CONTINUE
> 
> Compiled the program verbatim and run it using stress utility (http
> s://godoc.org/golang.org/x/tools/cmd/stress namely just runs the
> program in parallel loop) and instantly get the following crash.

OK, I'll take a deeper look.


thanks,

Takashi