linux-kernel - Re: Fwd: Kernels v6.5 and v6.6 break resume from standby (s3) on some Intel systems if VT-d is enabled

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Date:   Tue, 5 Dec 2023 15:57:46 +0100
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     Linux Regressions <regressions@...ts.linux.dev>
Cc:     Lu Baolu <baolu.lu@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Helge Deller <deller@....de>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        kbugreports@...ton.me, Linux IOMMU <iommu@...ts.linux.dev>,
        Linux Power Management <linux-pm@...r.kernel.org>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mario Limonciello <mario.limonciello@....com>,
        David Woodhouse <dwmw2@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Fwd: Kernels v6.5 and v6.6 break resume from standby (s3) on some
 Intel systems if VT-d is enabled

[CCing Mario, as he might be interested]

On 03.12.23 13:31, Bagas Sanjaya wrote:
> On Tue, Nov 28, 2023 at 08:09:24PM +0700, Bagas Sanjaya wrote:
>> I notice a regression report on Bugzilla [1]. Quoting from it:
>>> 
>>> Affected system:
>>> 
>>> Thinkpad, Intel Kaby Lake (i7-7600U) chipset / cpu and onboard
>>> gpu (Intel HD 620), no separate graphics card, current bios
>>> firmware; running Void Linux, xfce / lightdm
>>> 
>>> Symptom / problem:
>>> 
>>> Since the upgrade to kernel v6.5.5 (from v6.3.13) my system
>>> doesn't wake up from standby, i.e. resume from s3 fails 100% of
>>> the time.
>
>> https://bugzilla.kernel.org/show_bug.cgi?id=218191 
> 
> The reporter had done bisection (see Bugzilla for details),

Turns out the kernel used by the reporter is not vanilla, as zfs is
involved -- and due to that the reporter is not even able to check if
mainline is still affected. I'll thus remove this from the tracking.
Sorry for the noise.

In case anyone nevertheless cares: The bisection result from the report
was 0c7ffa32dbd6b0 ("x86/smpboot/64: Implement
arch_cpuhp_init_parallel_bringup() and enable it") [v6.5-rc1].
This time on a Intel machine. Mario's "Fixes for s3 with parallel
bootup" patch-series[1] (the one were abandoned because things turned
out to be a BIOS bug affecting some AMD systems) apparently resolved the
problem for the reporter.

[1]
https://lore.kernel.org/all/20231026170330.4657-1-mario.limonciello@amd.com/

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.

#regzbot inconclusive: kernel used by the reporter is not vanilla