linux-ext4 - Re: [BUG] xfstests #68 with data=journal hang against 3.8-rc7 and 'dev' branch

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Date:	Tue, 19 Feb 2013 09:55:29 +0100
From:	Jan Kara <jack@...e.cz>
To:	Zheng Liu <gnehzuil.liu@...il.com>
Cc:	linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>
Subject: Re: [BUG] xfstests #68 with data=journal hang against 3.8-rc7 and
 'dev' branch

  Hi,

On Mon 18-02-13 01:22:08, Zheng Liu wrote:
> Xfstests #68 will hang with data=journal in 3.8-rc7 and 'dev' branch. I
> remember that there has a patch for ext4 to fix filesystem freeze bug
> but I am not sure whether it can fix this bug and it has been applied
> into 'dev' branch.  So I file this bug here.
  Yes, I also recently hit this bug. I found that the root cause is that in
data=journal mode there are dirty pages even after syncing the whole
filesystem. I didn't yet found out why that happens but dirty page handling
is complex in data=journal mode as pages get marked dirty at the moment
transaction is committing and buffers are filed into checkpoint lists so I
find it quite possible there is some case I didn't think about where
syncing results in non-clean filesystem.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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