linux-kernel - Re: linux-next: kernel BUG at mm/slub.c:1447!

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Message-ID: <20151002134243.GB16302@dhcp22.suse.cz>
Date:	Fri, 2 Oct 2015 15:42:44 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	linux-mm@...ck.org, Dave Chinner <david@...morbit.com>
Subject: Re: linux-next: kernel BUG at mm/slub.c:1447!

On Fri 02-10-15 06:36:57, Guenter Roeck wrote:
> On 10/01/2015 01:49 PM, Andrew Morton wrote:
> >On Thu, 1 Oct 2015 09:06:15 -0700 Guenter Roeck <linux@...ck-us.net> wrote:
> >
> >>Seen with next-20151001, running qemu, simulating Opteron_G1 with a non-SMP configuration.
> >>On a re-run, I have seen it with the same image, but this time when simulating IvyBridge,
> >>so it is not CPU dependent. I did not previously see the problem.
> >>
> >>Log is at
> >>http://server.roeck-us.net:8010/builders/qemu-x86-next/builds/259/steps/qemubuildcommand/logs/stdio
> >>
> >>I'll try to bisect. The problem is not seen with every boot, so that may take a while.
> >
> >Caused by mhocko's "mm, fs: obey gfp_mapping for add_to_page_cache()",
> >I expect.
> >
> I tried to bisect to be sure, but the problem doesn't happen often enough, and I got some
> false negatives. I assume bisect is no longer necessary. If I need to try again, please
> let me know.

The updated patch has been posted here:
http://lkml.kernel.org/r/20151002085324.GA2927%40dhcp22.suse.cz

Andrew's analysis seems decent so I am pretty sure it should fix the
issue.
-- 
Michal Hocko
SUSE Labs
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