From: Dave Chinner <david@fromorbit.com>
To: Theodore Ts'o <tytso@mit.edu>
Cc: linux-ext4@vger.kernel.org, fstests@vger.kernel.org,
tarasov@vasily.name, axboe@fb.com
Subject: Re: Test generic/299 stalling forever
Date: Thu, 13 Oct 2016 08:14:07 +1100 [thread overview]
Message-ID: <20161012211407.GL23194@dastard> (raw)
In-Reply-To: <20160929043722.ypf3tnxsl6ovt653@thunk.org>
On Thu, Sep 29, 2016 at 12:37:22AM -0400, Theodore Ts'o wrote:
> 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.
>
> Out of curiosity, Dave, are you still using fio 2.1.3? I had upgraded
No.
$ fio -v
fio-2.1.11
$
> to the latest fio to fix other test breaks, and I'm stil seeing the
> occasional generic/299 test failure. In fact, it's been happening
> often enough on one of my test platforms[1] that I decided to really
> dig down and investigate it, and all of the threads were blocking on
> td->verify_cond in fio's verify.c.
>
> It bisected down to this commit:
>
> commit e5437a073e658e8154b9e87bab5c7b3b06ed4255
> Author: Vasily Tarasov <tarasov@vasily.name>
> Date: Sun Nov 9 20:22:24 2014 -0700
>
> Fix for a race when fio prints I/O statistics periodically
>
> Below is the demonstration for the latest code in git:
> ...
>
> So generic/299 passes reliably with this commits parent, and it fails
> on this commit within a dozen tries or so. The commit first landed in
> fio 2.1.14, so it's consistent with Dave's report a year ago he was
> still using fio 2.1.3.
But I'm still not using a fio recent enough to hit this.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2016-10-12 21:14 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-18 15:53 Test generic/299 stalling forever Theodore Ts'o
2015-06-18 16:25 ` Eric Whitney
2015-06-18 23:34 ` Dave Chinner
2015-06-19 2:56 ` Theodore Ts'o
2016-09-29 4:37 ` Theodore Ts'o
2016-10-12 15:46 ` Jens Axboe
2016-10-12 21:14 ` Dave Chinner [this message]
2016-10-12 21:19 ` Jens Axboe
2016-10-13 2:15 ` Theodore Ts'o
2016-10-13 2:39 ` Jens Axboe
2016-10-13 23:19 ` Theodore Ts'o
2016-10-18 18:01 ` Theodore Ts'o
2016-10-19 14:06 ` Jens Axboe
2016-10-19 17:49 ` Jens Axboe
2016-10-19 20:32 ` Theodore Ts'o
2016-10-20 14:22 ` Jens Axboe
2016-10-21 22:15 ` Theodore Ts'o
2016-10-23 2:02 ` Theodore Ts'o
2016-10-23 14:32 ` Jens Axboe
2016-10-23 19:33 ` Theodore Ts'o
2016-10-23 21:24 ` Theodore Ts'o
2016-10-24 1:41 ` Jens Axboe
2016-10-24 3:38 ` Theodore Ts'o
2016-10-24 16:28 ` Jens Axboe
2016-10-25 2:54 ` Theodore Ts'o
2016-10-25 2:59 ` Jens Axboe
2016-10-13 13:08 ` Anatoly Pugachev
2016-10-13 13:36 ` Anatoly Pugachev
2016-10-13 14:28 ` Jens Axboe
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