On Mon, 08 Jan 2018 16:37:32 +0100, Lars-Peter Clausen wrote: > > On 01/08/2018 04:05 PM, Takashi Iwai wrote: > > 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@xxxxxxxxxx and > > 001a1147e1988b160a05620552eb@xxxxxxxxxx) > > > > The patches seem curing them, so far, in combination with other > > patches in for-linus branch of sound.git tree. > > > > Hm, interesting. Are you using aloop for the backend or real hardware? The RCU stall happened also with dummy driver. Just feeding a GB of chunk to /dev/audio and aborting the stream concurrently, then it stalls at that point. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
