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Date: Mon, 11 Dec 2017 10:53:06 -0500
From: Steven Rostedt <rostedt@goodmis.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-kernel@vger.kernel.org,
        linux-rt-users <linux-rt-users@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, Carsten Emde <C.Emde@osadl.org>,
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        Daniel Wagner <daniel.wagner@siemens.com>, tom.zanussi@linux.intel.com,
        Alex Shi <alex.shi@linaro.org>, stable-rt@vger.kernel.org
Subject: Re: [PATCH RT 1/9] Revert "fs: jbd2: pull your plug when waiting
 for space"
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On Mon, 11 Dec 2017 16:37:09 +0100
Sebastian Andrzej Siewior <bigeasy@linutronix.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