linux-ext4 - Re: Test generic/299 stalling forever

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Message-ID: <20161013021552.l6afs2k5tjcsfp2k@thunk.org>
Date:   Wed, 12 Oct 2016 22:15:52 -0400
From:   Theodore Ts'o <tytso@....edu>
To:     Jens Axboe <axboe@...com>
Cc:     Dave Chinner <david@...morbit.com>, linux-ext4@...r.kernel.org,
        fstests@...r.kernel.org, tarasov@...ily.name
Subject: Re: Test generic/299 stalling forever

On Wed, Oct 12, 2016 at 03:19:25PM -0600, Jens Axboe wrote:
> 
> FWIW, this is the commit that fixes it:
> 
> commit 39d13e67ef1f4b327c68431f8daf033a03920117
> Author: Jens Axboe <axboe@...com>
> Date:   Fri Aug 26 14:39:30 2016 -0600
> 
>     backend: check if we need to update rusage stats, if stat_mutex is busy
> 
> 2.14 and newer should not have the problem, but earlier versions may
> depending on how old...

Unfortunately, I'm still seeing hangs in generic/299 with the latest version of fio:

fio 	  fio-2.14-10-g0a301e9 (Fri, 23 Sep 2016 11:57:00 -0600)

If I use an older fio, it reliably does not hang.  What can I do to
help debug this?

As I said, I can attach to the hanging fio using a gdb and give you
stackdumps for all of the threads if that would be helpful.

	       	      	  	     - Ted


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