Re: [v4.13-rc BUG] system lockup when running big buffered write(4M) to IB SRP via mpath

[Mike Snitzer <snitzer@redhat.com>]

On Wed, Aug 23 2017 at 11:12am -0400,
Bart Van Assche <Bart.VanAssche@wdc.com> wrote:

> On Wed, 2017-08-23 at 19:35 +0800, Ming Lei wrote:
> > soft lockup still can be observed easily with patch d4acf3650c7c(
> > block: Make blk_mq_delay_kick_requeue_list() rerun the queue at a quiet time),
> > but no hard lockup.
> 
> Hello Ming,
> 
> I never claimed that commit d4acf3650c7c was a full solution to avoid these
> soft lockups. I assume these results mean that patch series "[PATCH 0/7]
> Device mapper and dm-mpath fixes" was not applied to the kernel used in your
> tests? A colleague of you has reported that that patch series is sufficient
> to avoid these soft lockups. See also
> https://www.redhat.com/archives/dm-devel/2017-August/msg00122.html.

FYI, I'll try to review/stage that patchset for 4.14 over the next few
days.

(I'm not yet back to working full-time but will try to handle my
upstream responsibilities)

Mike