[alsa-devel] [PATCH 0/2] PCM OSS fixes

[Takashi Iwai]

On Mon, 08 Jan 2018 15:58:47 +0100,
Lars-Peter Clausen wrote:
> 
> On 01/08/2018 03:25 PM, Takashi Iwai wrote:
> > Hi,
> > 
> > this contains two fixes for PCM OSS bugs that have been triggered by
> > syzbot.  These are simple and straightforward, and I'm going to queue
> > for 4.15-rc8.
> 
> I tried to reproduce the issue as well with the reproducer generated by
> syzbot. But what syzbot reported was that the CPU didn't sleep for 140
> seconds. But with a long write() we'll go to sleep in between frames. So
> when I tried the lockup detector never triggered.
> 
> Were you able to reproduce the same CPU lockup as syzbot?

Yes, I could reproduce RCU stalls with two reproducers
(001a113ece5c2b600d05620b097a at google.com and
 001a1147e1988b160a05620552eb at google.com)

The patches seem curing them, so far, in combination with other
patches in for-linus branch of sound.git tree.


thanks,

Takashi