linux-ext4 - Re: Bug#615998: linux-image-2.6.32-5-xen-amd64: Repeatable "kernel BUG at fs/jbd2/commit.c:534" from Postfix on ext4

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Date:	Wed, 31 Aug 2011 09:40:31 -0500
From:	"Moffett, Kyle D" <Kyle.D.Moffett@...ing.com>
To:	Jan Kara <jack@...e.cz>
CC:	Sean Ryle <seanbo@...il.com>, "Ted Ts'o" <tytso@....edu>,
	"615998@...s.debian.org" <615998@...s.debian.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Sachin Sant <sachinp@...ibm.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: Bug#615998: linux-image-2.6.32-5-xen-amd64: Repeatable "kernel
 BUG at fs/jbd2/commit.c:534" from Postfix on ext4

On Aug 30, 2011, at 18:12, Jan Kara wrote:
> On Fri 26-08-11 16:03:32, Moffett, Kyle D wrote:
>> Ping?
>> 
>> Any more ideas for debugging this issue?
> 
> Sorry for not getting to you earlier.

That's ok, I have a workaround so it's been on my back burner for a while.

>> I can still trigger it on my VM snapshot very easily, so if you have anything
>> you think I should test I would be very happy to give it a shot.
> 
>  OK, so in the meantime I found a bug in data=journal code which could be
> related to your problem. It is fixed by commit
> 2d859db3e4a82a365572592d57624a5f996ed0ec which is in 3.1-rc1. Have you
> tried that or newer kernel as well?
> 
> If the problem still is not fixed, I can provide some debugging patch to
> you. We spoke with Josef Bacik how errors like yours could happen so I have
> some places to watch...

I have not tried anything more recent; I'm actually a bit reluctant to move
away from the Debian squeeze official kernels since I do need the security
updates.

I took a quick look and I can't find that function in 2.6.32, so I assume it
would be a rather nontrivial back-port.  It looks like the relevant code
used to be in ext4_clear_inode somewhere?

Out of curiosity, what would happen in data=journal mode if you unlinked a
file which still had buffers pending?  That case does not seem to be handled
by that commit you mentioned, was it already handled elsewhere?

Thanks again!

Cheers,
Kyle Moffett
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