linux-ext4 - Re: [PATCH] fix oops in ext4_mb_release_group

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Date:	Sat, 9 Oct 2010 18:26:28 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	Josef Bacik <josef@...hat.com>
Subject: Re: [PATCH] fix oops in ext4_mb_release_group_pa tracing

On Thu, Aug 19, 2010 at 12:59:50PM -0500, Eric Sandeen wrote:
> Our QA reported an oops in the ext4_mb_release_group_pa tracing,
> and Josef Bacik pointed out that it was because we may have a
> non-null but uninitialized ac_inode in the allocation context.
> 
> I can reproduce it when running xfstests with ext4 tracepoints on, 
> on a CONFIG_SLAB_DEBUG kernel.
> 
> We call trace_ext4_mb_release_group_pa from 2 places, 
> ext4_mb_discard_group_preallocations and 
> ext4_mb_discard_lg_preallocations
> 
> In both cases we allocate an ac as a container just for tracing (!)
> and never fill in the ac_inode.  There's no reason to be assigning,
> testing, or printing it as far as I can see, so just remove it from
> the tracepoint.
> 
> Signed-off-by: Eric Sandeen <sandeen@...hat.com>

Thanks for the ping; I've added it to the ext4 patch tree.

       	       	     	  	      - Ted
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