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Re: Still seeing hangs in xlog_grant_log_space

To: Juerg Haefliger <juergh@xxxxxxxxx>
Subject: Re: Still seeing hangs in xlog_grant_log_space
From: Ben Myers <bpm@xxxxxxx>
Date: Fri, 18 May 2012 12:19:59 -0500
Cc: xfs@xxxxxxxxxxx
In-reply-to: <CADLDEKvgT_FcGhJKoPaQv0mh_Jqdaqu8SYatc9xxU7vOY217YQ@xxxxxxxxxxxxxx>
References: <CADLDEKvYkpUnMrqdMyqCmsYrZcUtiJ6ZRhrRu_ERTjn=r7M3Pg@xxxxxxxxxxxxxx> <20120426224412.GA9541@dastard> <CADLDEKs6oMDA-6OhmcFxyRoBVpduKtSput=53TQGn9NCAOXC1Q@xxxxxxxxxxxxxx> <20120426230738.GB9541@dastard> <CADLDEKuKLeYiqhQW0E9g_bS0VXoxPGPOck3N004Pxg4_Opbzow@xxxxxxxxxxxxxx> <20120427110922.GF9541@dastard> <CADLDEKtUHAGcOPT1jtcvyJVk+zsoL5_thYFtHJYs+w=6EGuVSA@xxxxxxxxxxxxxx> <CADLDEKs4YbNzj2c0HKHwSdUfKy0efdQRe1rOsWDkWUgd+BOGHw@xxxxxxxxxxxxxx> <20120507171908.GA16881@xxxxxxx> <CADLDEKvgT_FcGhJKoPaQv0mh_Jqdaqu8SYatc9xxU7vOY217YQ@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
Hey Juerg,

On Wed, May 09, 2012 at 09:54:08AM +0200, Juerg Haefliger wrote:
> > On Sat, May 05, 2012 at 09:44:35AM +0200, Juerg Haefliger wrote:
> >> Did anybody have a chance to look at the data?
> >
> > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/979498
> >
> > Here you indicate that you have created a reproducer.  Can you post it to 
> > the list?
> 
> Canonical attached them to the bug report that they filed yesterday:
> http://oss.sgi.com/bugzilla/show_bug.cgi?id=922

I'm interested in understanding to what extent the hang you see in production
on 2.6.38 is similar to the hang of the reproducer.  Mark is seeing a situation
where there is nothing on the AIL and is clogged up in the CIL, others are
seeing items on the AIL that don't seem to be making progress.  Could you
provide a dump or traces from a hang on a filesystem with a normal sized log?
Can the reproducer hit the hang eventually without resorting to the tiny log?

Regards,
        Ben

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