linux-kernel - Re: XFS Fails Quality Assurance Tests on ARM

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Message-ID: <4726C577.9000209@sandeen.net>
Date:	Tue, 30 Oct 2007 00:47:35 -0500
From:	Eric Sandeen <sandeen@...deen.net>
To:	Andi Kleen <andi@...stfloor.org>
CC:	David Miller <davem@...emloft.net>, byron.bbradley@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: XFS Fails Quality Assurance Tests on ARM

Andi Kleen wrote:
> David Miller <davem@...emloft.net> writes:
> 
>> From: Byron Bradley <byron.bbradley@...il.com>
>> Date: Fri, 31 Aug 2007 03:12:46 +0000 (UTC)
>>
>>> Anybody got any ideas of how we fix this?
>> I don't know how much testing XFS gets on ARM, but one thing that some
>> ARM chips have is D-cache aliasing problems and one thing XFS uses a
>> lot is virtual remapping of various data structures via vmap().
>>
>> This might be what is causing the problems.

Sorry, I lost the original to reply to, but stumbled on this thread
looking for something else.  :)

Anyway, from the assertion:

Assertion failed: (char *)sfep - (char *)sfp == dp->i_d.di_size, file:
fs/xfs/xfs_dir2_sf.c, line: 647 kernel BUG at fs/xfs/support/debug.c:82!

this is almost certainly a result of xfs_dir2_sf_off_t,
xfs_dir2_sf_hdr_t, and/or xfs_dir2_sf_entry_t or others not being
"properly" aligned on arm.

There was a patch floating around to "fix" it but it's not on-disk
compatible w/ x86 & friends, it just makes things consistent for arm.  I
think packing some of these structures would take care of it, but this
problem could use some attention & testing I think, it's been floating
around a long time.

-Eric
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