Special regressions report for the pending 5.16 release

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

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