Date: Wed, 21 Jul 2010 10:51:36 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: dann frazier <dannf@debian.org>
Cc: linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org,
        Hugh Dickins <hugh.dickins@tiscali.co.uk>,
        Rik van Riel <riel@redhat.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Nick Piggin <npiggin@suse.de>, Mel Gorman <mel@csn.ul.ie>,
        Minchan Kim <minchan.kim@gmail.com>,
        Ralf Baechle <ralf@linux-mips.org>
Subject: Re: ia64 hang/mca running gdb 'make check'
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In-Reply-To: <20100720173512.GF26783@ldl.fc.hp.com>
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On Tue, 20 Jul 2010 11:35:12 -0600
dann frazier <dannf@debian.org> wrote:

> Debian's ia64 autobuilders have been experiencing system crashes while
> trying to run the gdb test suite:
>   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=588574
> 
> I was able to reproduce this w/ the latest git tree, and bisected it
> down to this commit, introduced in 2.6.32:
> 
>   commit 62eede62dafb4a6633eae7ffbeb34c60dba5e7b1
>   Author: Hugh Dickins <hugh.dickins@tiscali.co.uk>
>   Date:   Mon Sep 21 17:03:34 2009 -0700
> 
>     mm: ZERO_PAGE without PTE_SPECIAL
> 
>     Reinstate anonymous use of ZERO_PAGE to all architectures, not just to
>     those which __HAVE_ARCH_PTE_SPECIAL: as suggested by Nick Piggin.
> 
>     Contrary to how I'd imagined it, there's nothing ugly about this, just a
>     zero_pfn test built into one or another block of vm_normal_page().
> 
>     But the MIPS ZERO_PAGE-of-many-colours case demands is_zero_pfn() and
>     my_zero_pfn() inlines.  Reinstate its mremap move_pte() shuffling of
>     ZERO_PAGEs we did from 2.6.17 to 2.6.19?  Not unless someone shouts for
>     that: it would have to take vm_flags to weed out some cases.
> 
> fyi, I found this to not be reproducible on SLES11 SP1 (which is
> 2.6.32-based). I compared the .configs and found that the relevant
> difference is the PAGE_SIZE. It does not fail w/ 64KB pages, but
> reliably fails w/ 16KB pages.
> 

Sorry, I have no idea...
Hmm, what is the address of empty_zero_page[] on your debian(16kb-page) ?

Thanks,
-Kame


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