linux-kernel - Re: [PATCH RT 1/9] Revert "fs: jbd2: pull your plug when waiting for space"

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Message-ID: <20171211105306.52cdf62f@vmware.local.home>
Date:   Mon, 11 Dec 2017 10:53:06 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-kernel@...r.kernel.org,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Julia Cartwright <julia@...com>,
        Daniel Wagner <daniel.wagner@...mens.com>,
        tom.zanussi@...ux.intel.com, Alex Shi <alex.shi@...aro.org>,
        stable-rt@...r.kernel.org
Subject: Re: [PATCH RT 1/9] Revert "fs: jbd2: pull your plug when waiting
 for space"

On Mon, 11 Dec 2017 16:37:09 +0100
Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:
 
> > Now it does appear I'm missing that for 4.4. I wonder why I didn't pull
> > it in there. Perhaps it wasn't needed, which means this isn't needed
> > either.  
> 
> I strongly suggest to include "locking/rt-mutex: fix deadlock in device
> mapper / block-IO". We had a workaround in the jbd/ext3 code which then
> moved into jbd2/ext4 after people complained about the same problem. I
> wasn't sure about the root-cause back then but now with explanation we
> have in the fix patch I'm sure this is one of the bugs we have since day
> one.

Yep. Not sure why I didn't include it in 4.4. I added it to my queue,
and started testing it, which is one of the reasons I haven't posted it
yet. Also, my internet connectivity has be really poor while traveling
this time.

-- Steve