linux-kernel - Re: [REGRESSION] tty lockup and WWAN loss after hibernate/suspend in 6.8+ on ThinkPad X1 Carbon Gen 10

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Message-ID: <CACTEcX5Y3PNXNkhnK1dGFe+k3sigOZNpj66KKGAS9XeHqRu35w@mail.gmail.com>
Date: Sun, 3 Aug 2025 15:45:06 +0300
From: Andy Mindful <andy.mindful@...il.com>
To: Jani Nikula <jani.nikula@...el.com>
Cc: linux-kernel@...r.kernel.org, regressions@...ts.linux.dev, 
	linux-pm@...r.kernel.org, intel-gfx@...ts.freedesktop.org, 
	dri-devel@...ts.freedesktop.org, linux-acpi@...r.kernel.org, 
	rafael@...nel.org, ville.syrjala@...ux.intel.com, tglx@...utronix.de
Subject: Re: [REGRESSION] tty lockup and WWAN loss after hibernate/suspend in
 6.8+ on ThinkPad X1 Carbon Gen 10

Here what I have from bisecting, please let me know if it makes things
clearer or not.

git bisect log
git bisect start
# status: waiting for both good and bad commits
# good: [6fc5460ed8dd0edf29e7c5cfb1ef9b1aa04208a1] Linux 6.7.11
git bisect good 6fc5460ed8dd0edf29e7c5cfb1ef9b1aa04208a1
# status: waiting for bad commit, 1 good commit known
# bad: [6613476e225e090cc9aad49be7fa504e290dd33d] Linux 6.8-rc1
git bisect bad 6613476e225e090cc9aad49be7fa504e290dd33d
# skip: [0dd3ee31125508cd67f7e7172247f05b7fd1753a] Linux 6.7
git bisect skip 0dd3ee31125508cd67f7e7172247f05b7fd1753a
# good: [ba5afb9a84df2e6b26a1b6389b98849cd16ea757] fs: rework
listmount() implementation
git bisect good ba5afb9a84df2e6b26a1b6389b98849cd16ea757
# good: [61da593f4458f25c59f65cfd9ba1bda570db5db7] Merge tag
'media/v6.8-2' of
git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
git bisect good 61da593f4458f25c59f65cfd9ba1bda570db5db7
# bad: [e38f734add21d75d76dbcf7b214f4823131c1bae] Merge tag
'staging-6.8-rc1' of
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
git bisect bad e38f734add21d75d76dbcf7b214f4823131c1bae
# bad: [5d197e97fb106c09d3d013be341e5961fd70ec8a] Merge tag
'hsi-for-6.8' of
git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-hsi
git bisect bad 5d197e97fb106c09d3d013be341e5961fd70ec8a
# good: [1b1934dbbdcf9aa2d507932ff488cec47999cf3f] Merge tag
'docs-6.8-2' of git://git.lwn.net/linux
git bisect good 1b1934dbbdcf9aa2d507932ff488cec47999cf3f
# good: [1b1934dbbdcf9aa2d507932ff488cec47999cf3f] Merge tag
'docs-6.8-2' of git://git.lwn.net/linux
git bisect good 1b1934dbbdcf9aa2d507932ff488cec47999cf3f
# bad: [8c9244af4dc8680a453e759331f0c93d5bde1898] Merge tag
'kvm-x86-svm-6.8' of https://github.com/kvm-x86/linux into HEAD
git bisect bad 8c9244af4dc8680a453e759331f0c93d5bde1898
# bad: [783288010035e4c250a0b6491a4642cdb8d30548] KVM: x86: add
missing "depends on KVM"
git bisect bad 783288010035e4c250a0b6491a4642cdb8d30548
# bad: [783288010035e4c250a0b6491a4642cdb8d30548] KVM: x86: add
missing "depends on KVM"
git bisect bad 783288010035e4c250a0b6491a4642cdb8d30548
# bad: [861deac3b092f37b2c5e6871732f3e11486f7082] Linux 6.7-rc7
git bisect bad 861deac3b092f37b2c5e6871732f3e11486f7082

# being on a 861deac3b092
git bisect bad
The merge base ba5afb9a84df2e6b26a1b6389b98849cd16ea757 is bad.
This means the bug has been fixed between
ba5afb9a84df2e6b26a1b6389b98849cd16ea757 and
[1b1934dbbdcf9aa2d507932ff488cec47999cf3f
61da593f4458f25c59f65cfd9ba1bda570db5db7
6fc5460ed8dd0edf29e7c5cfb1ef9b1aa04208a1
ba5afb9a84df2e6b26a1b6389b98849cd16ea757].

Thanks.

вт, 29 лип. 2025 р. о 13:20 Jani Nikula <jani.nikula@...el.com> пише:
>
> On Tue, 29 Jul 2025, Andy Mindful <andy.mindful@...il.com> wrote:
> > Please let me know if any further information or testing is required.
>
> Likely the quickest way to find the root cause is to bisect the issue.
>
>
> BR,
> Jani.
>
> --
> Jani Nikula, Intel