[alsa-devel] ALSA trigger soft lockup since "ALSA: seq: Fix race at creating a queue"

[Takashi Iwai]

On Sat, 04 Nov 2017 03:34:09 +0100,
Jerome Glisse wrote:
> 
> On Wed, Nov 01, 2017 at 01:02:27PM -0700, Andrew Morton wrote:
> > Begin forwarded message:
> > 
> > Date: Wed, 01 Nov 2017 12:54:16 -0700
> > From: syzbot <bot+63583aefef5457348dcfa06b87d4fd1378b26b09 at syzkaller.appspotmail.com>
> > To: aaron.lu at intel.com, akpm at linux-foundation.org, aneesh.kumar at linux.vnet.ibm.com, jack at suse.cz, kirill.shutemov at linux.intel.com, linux-kernel at vger.kernel.org, linux-mm at kvack.org, mhocko at suse.com, minchan at kernel.org, peterz at infradead.org, rientjes at google.com, sfr at canb.auug.org.au, shli at fb.com, syzkaller-bugs at googlegroups.com, willy at linux.intel.com, ying.huang at intel.com, zi.yan at cs.rutgers.edu
> > Subject: BUG: soft lockup
> > 
> > 
> > Hello,
> > 
> > syzkaller hit the following crash on  
> > 1d53d908b79d7870d89063062584eead4cf83448
> > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
> > compiler: gcc (GCC) 7.1.1 20170620
> > .config is attached
> > Raw console output is attached.
> > C reproducer is attached
> > syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> > for information about syzkaller reproducers
> 
> Sorry to be the bringer of bad news but after:
> 4842e98f26dd80be3623c4714a244ba52ea096a8
> and
> 7e1d90f60a0d501c8503e636942ca704a454d910
> 
> The attached syzkaller repro trigger a softlockup in workqueue. I am unfamiliar
> with that code so some familiar in that domain is more likely to find a proper
> solution.
> 
> Note with
> git revert 7e1d90f60a0d501c8503e636942ca704a454d910
> git revert 4842e98f26dd80be3623c4714a244ba52ea096a8
> fix the issue

Could you give the stack trace?


thanks,

Takashi