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

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Message-ID: <20150619025647.GJ4076@thunk.org>
Date:	Thu, 18 Jun 2015 22:56:47 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-ext4@...r.kernel.org, fstests@...r.kernel.org
Subject: Re: Test generic/299 stalling forever

On Fri, Jun 19, 2015 at 09:34:30AM +1000, Dave Chinner wrote:
> On Thu, Jun 18, 2015 at 11:53:37AM -0400, Theodore Ts'o wrote:
> > I've been trying to figure out why generic/299 has occasionally been
> > stalling forever.  After taking a closer look, it appears the problem
> > is that the fio process is stalling in userspace.  Looking at the ps
> > listing, the fio process hasn't run in over six hours, and using
> > attaching strace to the fio process, it's stalled in a FUTUEX_WAIT.
> > 
> > Has anyone else seen this?  I'm using fio 2.2.6, and I have a feeling
> > that I started seeing this when I started using a newer version of
> > fio.  So I'm going to try roll back to an older version of fio and see
> > if that causes the problem to go away.
> 
> I'm running on fio 2.1.3 at the moment and I havne't seen any
> problems like this for months. Keep in mind that fio does tend to
> break in strange ways fairly regularly, so I'd suggest an
> upgrade/downgrade of fio as your first move.

Yep, I've rolled back to fio-2.1.13-77-g0f9940a, which is what I had
been using previously for a long time, and the problem with
generic/299 seems to have gone away.  I had hoped that the days when
new releases of fio wouldn't intrdouce random new bugs was a temporary
aberration, but obviously that was a bit over-optimistic.

	    		       	     - Ted
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