Subject: Re: [mmots-2016-06-09-16-49] sleeping function called from slab_alloc()

From: Michal Hocko <[email-masked]>
Date: Mon, 13 Jun 2016 12:47:34 +0200

On Fri 10-06-16 14:59:16, Andrew Morton wrote:
> On Fri, 10 Jun 2016 11:55:54 +0200 mhocko <[email-masked]> wrote:
> 
> > On 2016-06-10 11:50, Sergey Senozhatsky wrote:
> > > Hello,
> > > 
> > > forked from http://marc.info/?l=linux-mm&m=146553910928716&w=2
> > > 
> > > new_slab()->BUG->die()->exit_signals() can be called from atomic
> > > context: local IRQs disabled in slab_alloc().
> > 
> > I have sent a patch to drop the BUG() from that path today. It
> > is just too aggressive way to react to a non-critical bug.
> > See 
> > http://lkml.kernel.org/r/[email-masked]
> 
> Doesn't this simply mean that Sergey's workload will blurt a pr_warn()
> rather than a BUG()?  That still needs fixing.  Confused.

Yes that should be fixed by
http://lkml.kernel.org/r/[email-masked]

which prevents from using a wrong GFP...

-- 
Michal Hocko
SUSE Labs