Bad Page dump (help)

[Felipe Balbi]

On Thu, Jul 31, 2014 at 08:43:44AM -0500, Felipe Balbi wrote:
> Hi,
> 
> On Thu, Jul 31, 2014 at 08:24:15AM +0200, Gilles Chanteperdrix wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> > 
> > On 07/29/2014 09:07 PM, Felipe Balbi wrote:
> > > Hi Russell,
> > > 
> > > I'm bringing up a new board on today's linux-next but I'm having a bunch
> > > of bad_page() calls due to _mapcount not being zero (full logs
> > > attached). What could cause that ? Any hints on how to debug ? It's as
> > > if page_mapcount_reset() wasn't called for the pages which are causing
> > > issues.
> > 
> > FWIW, the same issue appeared on a Cogent CSB637 board (the last board 
> > I use not using DT) in between 3.13 and 3.14. I ran a bisect and found 
> > that reverting the following commit:
> > 
> > commit 84f452b1e8fc73ac0e31254c66e3e2260ce5263d
> > Author: Santosh Shilimkar <santosh.shilimkar at ti.com>
> > Date:   Sun Jun 30 00:28:46 2013 -0400
> > 
> >     ARM: mm: Remove bootmem code and switch to NO_BOOTMEM
> >     
> >     Now with dma_mask series merged and max*pfn has consistent meaning on ARM
> >     as rest of the arch's thanks to RMK's mega series, lets switch ARM code
> >     to NO_BOOTMEM. With NO_BOOTMEM change, now we use memblock allocator to
> >     reserve space for crash kernel to have one less dependency with nobootmem
> >     allocator wrapper.
> >     
> >     Tested with both flat memory and sparse (faked) memory models with highmem
> >     enabled.
> 
> Thanks I'll give this a shot.

Reverting didn't help. It made things worse, now it doesn't even boot
anymore :-)

-- 
balbi
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