From: Christoph Hellwig <hch@infradead.org>
To: Amit Sahrawat <amit.sahrawat83@gmail.com>
Cc: xfs@oss.sgi.com
Subject: Re: XFS: Observed Crash followed by deadlock of khubd/sync/XFS
Date: Tue, 13 Sep 2011 11:26:08 -0400 [thread overview]
Message-ID: <20110913152607.GA21460@infradead.org> (raw)
In-Reply-To: <CADDb1s2S9R5RoaJ2NGSbCXORngx8PQVB6r3-QVJbjCUYh+B63Q@mail.gmail.com>
On Thu, Sep 08, 2011 at 10:58:35PM +0530, Amit Sahrawat wrote:
> Since this is very hard to reproduce, to make it easy to debug. This
> can be reproduce by introducing msleep in the kernel xfs_umountfs()
> before xfs_log_sbcount(), just add a print before this function and
> sleep and the moment the print appear unplug the USB device, same
> scenario will be reproduced.
> CRASH will show the backtrace and return to normal shell, but when
> process state is checked, khubd will be shown in TASK-UNINTERRUPTIBLE
> state 'D'.
> Further if sync is issued that will also get converted to 'D' state,
> the back-trace for each of the task is same as mentioned in the
> previous mail.
I've not been able to reproduce this using that method so far.
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next prev parent reply other threads:[~2011-09-13 15:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-08 11:05 XFS: Observed Crash followed by deadlock of khubd/sync/XFS Amit Sahrawat
2011-09-08 17:28 ` Amit Sahrawat
2011-09-13 15:26 ` Christoph Hellwig [this message]
2011-09-13 15:43 ` Amit Sahrawat
2011-09-10 18:30 ` Christoph Hellwig
2011-09-11 16:46 ` Amit Sahrawat
2011-09-12 11:02 ` Amit Sahrawat
2011-09-12 11:06 ` Amit Sahrawat
2011-09-12 11:15 ` Amit Sahrawat
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