linux-kernel - Re: [regression/bisected] 4.19 cycle boot time IO stalls

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Date:   Wed, 05 Sep 2018 18:28:09 +0200
From:   Mike Galbraith <efault@....de>
To:     Jens Axboe <axboe@...nel.dk>, LKML <linux-kernel@...r.kernel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [regression/bisected] 4.19 cycle boot time IO stalls

On Wed, 2018-09-05 at 07:39 -0600, Jens Axboe wrote:
> 
> I bet it's the host busy change from Ming, which I already
> reported as being the culprit for another test failure I had. For
> some reason it's not merged yet, nudge nudge Martin. You can test
> by reverting:
> 
> commit 328728630d9f2bf14b82ca30b5e47489beefe361
> Author: Ming Lei <ming.lei@...hat.com>
> Date:   Sun Jun 24 22:03:27 2018 +0800
> 
>     scsi: core: avoid host-wide host_busy counter for scsi_mq
> 
> which was slightly modified by 265d59aacbce, so you'll want to
> yank that one first.

Bingo (woohoo, no dog slow take 2 required).

> BTW, that suse email for me hasn't worked in 12 years :-)

Yeah, I must have double tapped mouse, and picked up one of the many
ancient artifacts in Evolution's DB.  Sorry about that.

	-Mike