linux-ext4 - Re: "I/O 8 QID 0 timeout, reset controller" on 5.6-rc2

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Date:   Wed, 4 Mar 2020 19:19:22 +0800
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Keith Busch <kbusch@...nel.org>
Cc:     linux-nvme@...ts.infradead.org, linux-ext4@...r.kernel.org
Subject: Re: "I/O 8 QID 0 timeout, reset controller" on 5.6-rc2

On Wed, Mar 4, 2020 at 6:02 AM Keith Busch <kbusch@...nel.org> wrote:
>
> On Mon, Mar 02, 2020 at 10:03:39AM +0800, Jason A. Donenfeld wrote:
> > Hi,
> >
> > My torrent client was doing some I/O when the below happened. I'm
> > wondering if this is a known thing that's been fixed during the rc
> > cycle, a regression, or if my (pretty new) NVMe drive is failing.
> >
> > Thanks,
> > Jason
> >
> > Feb 24 20:36:58 thinkpad kernel: nvme nvme1: I/O 852 QID 15 timeout, aborting
> > Feb 24 20:37:29 thinkpad kernel: nvme nvme1: I/O 852 QID 15 timeout, reset controller
> > Feb 24 20:37:59 thinkpad kernel: nvme nvme1: I/O 8 QID 0 timeout, reset controller
> > Feb 24 20:39:00 thinkpad kernel: nvme nvme1: Device not ready; aborting reset
> > Feb 24 20:39:00 thinkpad kernel: nvme nvme1: Abort status: 0x371
>
> Sorry to say, this indicates the controller has become unresponsive.
> You usually see "timeout" messages in batches, though, so I wonder if
> only the one IO command timed out or if the controller just doesn't
> support an abort command limit.
>
> You can try throttling the queue depth and see if the problem goes away.
> The lowest possible depth can be set with kernel param
> "nvme.io_queue_depth=2".

I was unfortunately never able to reproduce. This happened while
downloading a torrent, and torrent clients have a history of creating
"interesting" I/O patterns. Hardware is "Samsung SSD 970 EVO Plus
2TB".