linux-kernel - Re: ext3 __log_wait_for

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Date:	Fri, 31 Oct 2008 16:45:38 +0200 (EET)
From:	Meelis Roos <mroos@...ux.ee>
To:	Theodore Tso <tytso@....edu>
cc:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: ext3 __log_wait_for_space: no transactions

> You'll almost certainly get much better performance if you increase
> your journal size.  I should make the crash go away, too, although I
> would like to figure out what is going on so we can fix it.

OK, but let's fix this first.

> In the meantime, you say this happens nightly.  Can you take a look at
> the time when it normally crashes and see if you can correlate it to
> some cron job activity?  Maybe that will be a hint as to what is
> triggering it.

I had a look but didn't find anything very useful. Will reread the logs 
now... it seems useful though:

Oct 30 09:39:01 rhn /USR/SBIN/CRON[21777]: (root) CMD (  [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type f -cmin +$(/usr/lib/php5/maxlifetime) -print0 | xargs -n 200 -r -0 rm)

No hangs on Oct 29.

Oct 28 02:39:01 rhn /USR/SBIN/CRON[5459]: (root) CMD (  [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type f -cmin +$(/usr/lib/php5/maxlifetime) -print0 | xargs -n 200 -r -0 rm)

Oct 27 it did not hang.

Oct 26 14:39:01 rhn /USR/SBIN/CRON[5116]: (root) CMD (  [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type f -cmin +$(/usr/lib/php5/maxlifetime) -print0 | xargs -n 200 -r -0 rm)

Seems to be a hang at Sunday at daytime when nobody was using it but 
cron daemon.

These are all last lines in syslog before the crash, coming from
/etc/cron.d/php5:09,39 *     * * *     root   [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type f -cmin +$(/usr/lib/php5/maxlifetime) -print0 | xargs -n 200 -r -0 rm
so it runs twice an hour.

-- 
Meelis Roos (mroos@...ux.ee)
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