linux-kernel - Re: next-20211015: suspend to ram on x86-32 broken

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Message-ID: <20211018071349.GA16631@duo.ucw.cz>
Date:   Mon, 18 Oct 2021 09:13:49 +0200
From:   Pavel Machek <pavel@....cz>
To:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        hpa@...or.com, linux-kernel@...r.kernel.org, rafael@...nel.org,
        len.brown@...el.com, linux-pm@...r.kernel.org,
        sfr@...b.auug.org.au, peterz@...radead.org, gor@...ux.ibm.com
Subject: Re: next-20211015: suspend to ram on x86-32 broken

Hi!

> On Thinkpad X60, suspend to ram no longer works. Suspend is okay, and
> there are some signs of resume attempts for second or so, but screen
> stays black and sleep LED stays on.

I did a bisection:

# bad: [7c832d2f9b959e3181370c8b0dacaf9efe13fc05] Add linux-next specific files for 20211015
# good: [64570fbc14f8d7cb3fe3995f20e26bc25ce4b2cc] Linux 5.15-rc5
git bisect start 'next-20211015' 'HEAD'
# good: [048c22e37f3dee5adf67e97c48735c325edbb178] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git
git bisect good 048c22e37f3dee5adf67e97c48735c325edbb178
# bad: [ff4d6dddf948544ef8fa7e5b539ced1f854c0a7f] Merge branch 'auto-latest' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
git bisect bad ff4d6dddf948544ef8fa7e5b539ced1f854c0a7f
# good: [3d4352bd49acf0f81a2dae28e910e80c80aec115] Merge branch 'drm-next' of https://gitlab.freedesktop.org/agd5f/linux
git bisect good 3d4352bd49acf0f81a2dae28e910e80c80aec115
# good: [5e135c8bb89c9f83e7db6216b2bff96c5433728c] Merge branch 'for-next' of git://git.kernel.dk/linux-block.git
git bisect good 5e135c8bb89c9f83e7db6216b2bff96c5433728c
# good: [6e85e7634927384c362395bda82e3759ae94c7c6] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git
git bisect good 6e85e7634927384c362395bda82e3759ae94c7c6
# good: [ac716d0d92cbb48cd635a4ac41829f8ebd7f369c] Merge remote-tracking branch 'tip/locking/core' into tip-master
git bisect good ac716d0d92cbb48cd635a4ac41829f8ebd7f369c
# bad: [a5dd661e53635877debbf48045913266b429950a] Merge remote-tracking branch 'tip/sched/core' into tip-master
git bisect bad a5dd661e53635877debbf48045913266b429950a
# good: [16d364ba6ef2aa59b409df70682770f3ed23f7c0] sched/topology: Introduce sched_group::flags
git bisect good 16d364ba6ef2aa59b409df70682770f3ed23f7c0
# good: [769fdf83df57b373660343ef4270b3ada91ef434] sched: Fix DEBUG && !SCHEDSTATS warn
git bisect good 769fdf83df57b373660343ef4270b3ada91ef434
# bad: [b6153093de41186e2c534ffffb8ce81b1666b110] sched/numa: Replace hard-coded number by a define in numa_task_group()
git bisect bad b6153093de41186e2c534ffffb8ce81b1666b110
# good: [00619f7c650e4e46c650cb2e2fd5f438b32dc64b] sched,livepatch: Use task_call_func()
git bisect good 00619f7c650e4e46c650cb2e2fd5f438b32dc64b
# bad: [2aa45be430a031c10d5f4a5bf3329ff8413a9187] sched,livepatch: Use wake_up_if_idle()
git bisect bad 2aa45be430a031c10d5f4a5bf3329ff8413a9187

It said

commit 8850cb663b5cda04d33f9cfbc38889d73d3c8e24 (HEAD)
Author: Peter Zijlstra <peterz@...radead.org>
Date:   Tue Sep 21 22:16:02 2021 +0200

    sched: Simplify wake_up_*idle*()

is first bad commit.

-- 
http://www.livejournal.com/~pavelmachek

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