linux-kernel - Re: stalling IO regression in linux 5.12

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Message-Id: <ad78a32c-7790-4e21-be9f-81c5848a4953@www.fastmail.com>
Date:   Wed, 10 Aug 2022 15:34:43 -0400
From:   "Chris Murphy" <lists@...orremedies.com>
To:     "Josef Bacik" <josef@...icpanda.com>
Cc:     "Btrfs BTRFS" <linux-btrfs@...r.kernel.org>,
        Linux-RAID <linux-raid@...r.kernel.org>,
        linux-block@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: stalling IO regression in linux 5.12



On Wed, Aug 10, 2022, at 2:42 PM, Chris Murphy wrote:
> On Wed, Aug 10, 2022, at 2:33 PM, Chris Murphy wrote:
>> On Wed, Aug 10, 2022, at 1:48 PM, Josef Bacik wrote:
>>
>>> To help narrow this down can you disable any IO controller you've got enabled
>>> and see if you can reproduce?  If you can sysrq+w is super helpful as it'll
>>> point us in the next direction to look.  Thanks,
>>
>> I'm not following, sorry. I can boot with 
>> systemd.unified_cgroup_hierarchy=0 to make sure it's all off, but we're 
>> not using an IO cgroup controllers specifically as far as I'm aware.
>
> OK yeah that won't work because the workload requires cgroup2 or it won't run.


Booted with cgroup_disable=io, and confirmed cat /sys/fs/cgroup/cgroup.controllers does not list io.

I'll rerun the workload now. Sometimes reproduces fast, other times a couple hours.



-- 
Chris Murphy