linux-kernel - Re: [mmots-2016-06-09-16-49] sleeping function called from slab

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Message-Id: <20160610145916.d071635d6462e4d837959e45@linux-foundation.org>
Date:	Fri, 10 Jun 2016 14:59:16 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	mhocko <mhocko@...e.de>
Cc:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Christoph Lameter <cl@...ux.com>,
	Michal Hocko <mhocko@...nel.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Stephen Rothwell <sfr@...b.auug.org.au>, linux-mm@...ck.org,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	linux-kernel-owner@...r.kernel.org
Subject: Re: [mmots-2016-06-09-16-49] sleeping function called from
 slab_alloc()

On Fri, 10 Jun 2016 11:55:54 +0200 mhocko <mhocko@...e.de> 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/1465548200-11384-2-git-send-email-mhocko@kernel.org

Doesn't this simply mean that Sergey's workload will blurt a pr_warn()
rather than a BUG()?  That still needs fixing.  Confused.