From: Dave Chinner <david@fromorbit.com>
To: Chris J Arges <chris.j.arges@canonical.com>
Cc: xfs@oss.sgi.com
Subject: Re: Still seeing hangs in xlog_grant_log_space
Date: Tue, 12 Jun 2012 09:53:37 +1000 [thread overview]
Message-ID: <20120611235337.GE22848@dastard> (raw)
In-Reply-To: <33996217.post@talk.nabble.com>
On Mon, Jun 11, 2012 at 01:42:31PM -0700, Chris J Arges wrote:
> Mark Tinguely-3 wrote:
> >
> > The perl script to recreate this problem is very similar to xfstest 273.
> > I use that because it avoids all the filesystem mount/unmount that
> > happen between the test 273 loops. You can build the log size that you
> > want to test, create the directories and let it run until it hangs.
> >
>
> I tested xfstest 273, and it looks like it exhibits a different issue than
> the OP in this thread.
> For example, if I run this test in a while [1] loop, I get the following
> backtrace:
>
> [16413.073946] XFS (sda5): Invalid block length (0xfffff48b) for buffer
That looks bad. How big is the log on this filesystem?
> [16413.073963] BUG: unable to handle kernel NULL pointer dereference at
> 0000000000000130
> [16413.074274] IP: [<ffffffffa02bb870>] uuid_is_nil+0x10/0x50 [xfs]
I can't really see how this function can get a null pointer
dereference. It checks the pointer passed in for being null before
doing anything, and otherwise it just increments and dereferences
the char pointer 16 times. I can't see how that results in a NULL
being dereferenced - I might just be blind though.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2012-06-11 23:53 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-23 12:09 Still seeing hangs in xlog_grant_log_space Juerg Haefliger
2012-04-23 14:38 ` Dave Chinner
2012-04-23 15:33 ` Juerg Haefliger
2012-04-23 23:58 ` Dave Chinner
2012-04-24 8:55 ` Juerg Haefliger
2012-04-24 12:07 ` Dave Chinner
2012-04-24 18:26 ` Juerg Haefliger
2012-04-25 22:38 ` Dave Chinner
2012-04-26 12:37 ` Juerg Haefliger
2012-04-26 22:44 ` Dave Chinner
2012-04-26 23:00 ` Juerg Haefliger
2012-04-26 23:07 ` Dave Chinner
2012-04-27 9:04 ` Juerg Haefliger
2012-04-27 11:09 ` Dave Chinner
2012-04-27 13:07 ` Juerg Haefliger
2012-05-05 7:44 ` Juerg Haefliger
2012-05-07 17:19 ` Ben Myers
2012-05-09 7:54 ` Juerg Haefliger
2012-05-10 16:11 ` Chris J Arges
2012-05-10 21:53 ` Mark Tinguely
2012-05-16 18:42 ` Ben Myers
2012-05-16 19:03 ` Chris J Arges
2012-05-16 21:29 ` Mark Tinguely
2012-05-18 10:10 ` Dave Chinner
2012-05-18 14:42 ` Mark Tinguely
2012-05-22 22:59 ` Dave Chinner
2012-06-06 15:00 ` Chris J Arges
2012-06-07 0:49 ` Dave Chinner
2012-05-17 20:55 ` Chris J Arges
2012-05-18 16:53 ` Chris J Arges
2012-05-18 17:19 ` Ben Myers
2012-05-19 7:28 ` Juerg Haefliger
2012-05-21 17:11 ` Ben Myers
2012-05-24 5:45 ` Juerg Haefliger
2012-05-24 14:23 ` Ben Myers
2012-05-07 22:59 ` Dave Chinner
2012-05-09 7:35 ` Dave Chinner
2012-05-09 21:07 ` Mark Tinguely
2012-05-10 2:10 ` Mark Tinguely
2012-05-18 9:37 ` Dave Chinner
2012-05-18 9:31 ` Dave Chinner
2012-05-24 20:18 ` Peter Watkins
2012-05-25 6:28 ` Juerg Haefliger
2012-05-25 17:03 ` Peter Watkins
2012-06-05 23:54 ` Dave Chinner
2012-06-06 13:40 ` Brian Foster
2012-06-06 17:41 ` Mark Tinguely
2012-06-11 20:42 ` Chris J Arges
2012-06-11 23:53 ` Dave Chinner [this message]
2012-06-12 13:28 ` Chris J Arges
2012-06-06 22:03 ` Mark Tinguely
2012-06-06 23:04 ` Brian Foster
2012-06-07 1:35 ` Dave Chinner
2012-06-07 14:16 ` Brian Foster
2012-06-08 0:28 ` Dave Chinner
2012-06-08 17:09 ` Ben Myers
2012-06-11 20:59 ` Mark Tinguely
2012-06-05 15:21 ` Chris J Arges
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