linux-ext4 - Re: [PATCH] ext4: fix xfstest generic/269 double revoked buffer bug

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Date:	Sat, 17 Oct 2015 22:30:24 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Daeho Jeong <daeho.jeong@...sung.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: fix xfstest generic/269 double revoked buffer bug

On Thu, Oct 15, 2015 at 09:23:18AM +0900, Daeho Jeong wrote:
> When you repeatly execute xfstest generic/269 with bigalloc_1k option
> enabled using the below command:
> 
> "./kvm-xfstests -c bigalloc_1k -m nodelalloc -C 1000 generic/269"
> 
> you can easily see the below bug message.
> 
> "JBD2 unexpected failure: jbd2_journal_revoke: !buffer_revoked(bh);"
> 
> This means that an already revoked buffer is erroneously revoked again
> and it is caused by doing revoke for the buffer at the wrong position
> in ext4_free_blocks(). We need to re-position the buffer revoke
> procedure for an unspecified buffer after checking the cluster boundary
> for bigalloc option. If not, some part of the cluster can be doubly
> revoked.
> 
> Signed-off-by: Daeho Jeong <daeho.jeong@...sung.com>

Thanks, applied.

						- Ted
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