linux-kernel - Re: ext3 __log_wait_for

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Message-ID: <20081030142103.GA14744@mit.edu>
Date:	Thu, 30 Oct 2008 10:21:03 -0400
From:	Theodore Tso <tytso@....edu>
To:	Meelis Roos <mroos@...ux.ee>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: ext3 __log_wait_for_space: no transactions

On Thu, Oct 30, 2008 at 11:49:34AM +0200, Meelis Roos wrote:
> I get this problem nightly on 2.6.28-rc2-* kernels on a generic
> Celeron 900/Intel 815/PATA/ext3 system.
> 
> __log_wait_for_space: no transactions
> Aborting journal on device sda3.
> ext3_abort called.
> EXT3-fs error (device sda3): ext3_journal_start_sb: Detected aborted journal
> Remounting filesystem read-only

How big is your journal?   What does this report?

    dumpe2fs -h /dev/sda3| grep Journal

If it's happening nightly, I assume it's because some cron job is
going off; it would be interesting to see what was going on at that time.

The other thing that would be useful would be to replace the call to
journal_abort() in __log_wait_for_space() in fs/jbd/checkpoint.c with
a BUG(), so we can get a stack backtrace and see what filesystem
operation was calling start_this_handle() (which in turn was calling
__log_wait_for_space) that is triggering this bug.

							- Ted
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