linux-kernel - Re: stalling IO regression since linux 5.12, through 5.18

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Message-Id: <f6f899a5-97e2-460f-ad73-73d4b5e38eb6@www.fastmail.com>
Date:   Wed, 17 Aug 2022 12:47:23 -0400
From:   "Chris Murphy" <lists@...orremedies.com>
To:     "Jan Kara" <jack@...e.cz>
Cc:     Holger Hoffstätte <holger@...lied-asynchrony.com>,
        "Nikolay Borisov" <nborisov@...e.com>,
        "Jens Axboe" <axboe@...nel.dk>,
        "Paolo Valente" <paolo.valente@...aro.org>,
        Linux-RAID <linux-raid@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "Josef Bacik" <josef@...icpanda.com>
Subject: Re: stalling IO regression since linux 5.12, through 5.18



On Wed, Aug 17, 2022, at 12:30 PM, Jan Kara wrote:

> BTW, are you sure the first problematic kernel is 5.12? 

100%

It consistently reproduces with any 5.12 series kernel, including from c03c21ba6f4e which is before rc1. It's frustrating that git bisect produces kernels that won't boot, I was more than half way through! :D And could have been done by now...

We've been running on 5.11 series kernels for a year because of this problem.


> BTW that may be an
> interesting thing to try: Can you boot with
> "megaraid_sas.host_tagset_enable = 0" kernel option and see whether the
> issue reproduces?

Yep.

-- 
Chris Murphy