linux-kernel - Re: possible regression on 3.13 when calling flush_dcache

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Date:	Fri, 3 Jan 2014 15:54:04 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<linux-mmc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Ludovic Desroches <ludovic.desroches@...el.com>
Subject: Re: possible regression on 3.13 when calling flush_dcache_page

Hi,

On Tue, Dec 24, 2013 at 03:38:37PM +0900, Joonsoo Kim wrote:

[...]

> > > > > > I think that this commit may not introduce a bug. This patch remove one
> > > > > > variable on slab management structure and replace variable name. So there
> > > > > > is no functional change.

You are right, the commit given by git bisect was not the good one...
Since I removed other patches done on top of it, I thought it really was
this one but in fact it is 8456a64.

 dd0f774  Fri Jan 3 12:33:55 2014 +0100  Revert "slab: remove useless
statement for checking pfmemalloc"  Ludovic Desroches 
 ff7487d  Fri Jan 3 12:32:33 2014 +0100  Revert "slab: rename
slab_bufctl to slab_freelist"  Ludovic Desroches 
 b963564  Fri Jan 3 12:32:13 2014 +0100  Revert "slab: fix to calm down
kmemleak warning"  Ludovic Desroches 
 3fcfe50  Fri Jan 3 12:30:32 2014 +0100  Revert "slab: replace
non-existing 'struct freelist *' with 'void *'"  Ludovic Desroches 
 750a795  Fri Jan 3 12:30:16 2014 +0100  Revert "memcg, kmem: rename
cache_from_memcg to cache_from_memcg_idx"  Ludovic Desroches 
 7e2de8a  Fri Jan 3 12:30:10 2014 +0100  mmc: atmel-mci: disable pdc
Ludovic Desroches

In this case I have the kernel oops. If I revert 8456a64 too, it
disappears.

I will try to test it on other devices because I couldn't reproduce it
with newer ones (but it's not the same ARM architecture so I would like
to see if it's also related to the device itself).

In attachment, there are the results of /proc/slabinfo before inserted the
sdio wifi module causing the oops.

Regards

Ludovic

View attachment "8456a64_reverted.log" of type "text/plain" (14408 bytes)

View attachment "with_8456a64.log" of type "text/plain" (14368 bytes)