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Subject: Re: [PATCH BUGFIX V3] block, bfq: add requeue-request hook
From: Mike Galbraith <efault@gmx.de>
To: Jens Axboe <axboe@kernel.dk>,
        Paolo Valente <paolo.valente@linaro.org>
Cc: Oleksandr Natalenko <oleksandr@natalenko.name>,
        stable <stable@vger.kernel.org>
Date: Sat, 17 Feb 2018 06:39:48 +0100
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On Sat, 2018-02-17 at 06:30 +0100, Mike Galbraith wrote:
> On Wed, 2018-02-14 at 08:44 -0700, Jens Axboe wrote:
> > 
> > Mike, when you see a hang like that, would it be possible for you to
> > dump the contents of /sys/kernel/debug/block/<dev in question/* for us
> > to inspect? That will tell us a lot about the internal state at that
> > time.
> 
> Finally. �4.15.4 stalled this morning while building other updated
> trees.
> 
> #!/bin/sh
> 
> for i in `find��/sys/kernel/debug/block/sd[bd] -type f`
> do
> 	echo $i:
> 	cat $i
> 	echo
> done

sdd was idle.. should have chopped that off.