linux-kernel - Special regressions report for the pending 5.16 release

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Message-ID: <7cd73147-2170-a0cd-c64e-ded4bef645b0@leemhuis.info>
Date:   Fri, 7 Jan 2022 11:59:05 +0100
From:   Thorsten Leemhuis <linux@...mhuis.info>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Cc:     Song Liu <songliubraving@...com>, Jens Axboe <axboe@...nel.dk>,
        wsa@...nel.org, Mario Limonciello <mario.limonciello@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Special regressions report for the pending 5.16 release

Hi Linus,



a quick brief manual regressions report, as I assume you'll likely
release 5.16 soon and thus might find this helpful. Below is a list of
remaining regressions in 5.16-rc I'm currently aware of.


regressions where a fix exists

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



* This fix afaics is not yet mainlined:

[PATCH] md/raid1: fix missing bitmap update w/o WriteMostly devices

https://lore.kernel.org/all/20220103230401.180704-1-song@kernel.org/



But I'm pretty sure Jens (CCed) will send it onwards soon:

https://lore.kernel.org/all/499b185d-ff9a-934e-7768-ec796244fa1a@kernel.dk/



* There is an open regression "Applications that need amdgpu doesn't run
after waking up from suspend":

https://lore.kernel.org/all/1295184560.182511.1639075777725@mail.yahoo.com/



Wolfram (CCed) plans to revert a i2c commit to fix it, but I'm not sure
if he plans to send in onwards for 5.16 (or if that would be a good idea
at all):

https://lore.kernel.org/lkml/20220106122452.18719-1-wsa@kernel.org/



* There are suspend and resume problems related to amdgpu:

https://bugzilla.kernel.org/show_bug.cgi?id=215436

Mario (CCed) recently found the root cause and came up with a fix, but
it likely needs a little more time to bake:

https://lore.kernel.org/all/BL1PR12MB5157F21C23A020052FF5C13BE24C9@BL1PR12MB5157.namprd12.prod.outlook.com/


https://lore.kernel.org/all/20220106163054.13781-3-mario.limonciello@amd.com/

no fix in sight

~~~~~~~~~~~~~~~



 * screen contents do get restored after some input events (so it
doesn't stay blank).

https://bugzilla.kernel.org/show_bug.cgi?id=215203

(related: https://gitlab.freedesktop.org/drm/amd/-/issues/1840 )



Alex (CCed) is trying hard to find a fix for, but afaics needs more time.



Need more time to analyse

~~~~~~~~~~~~~~~~~~~~~~~~~



I'm aware of two more reports that afaics need (a lot?) more time to
analyse:



 * suspend issues for a user that faces another regression that might
interfer:

https://lore.kernel.org/linux-pm/256689953.114854578.1640622738334.JavaMail.root@zimbra40-e7.priv.proxad.net/

https://bugzilla.kernel.org/show_bug.cgi?id=215427



 * 5-10% increase in IO latencies with nohz balance patch

https://lore.kernel.org/lkml/YaUH5GFFoLiS4%2F3%2F@localhost.localdomain/



Closing words

~~~~~~~~~~~~~



HTH, ciao, Thorsten