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: <20250804-canceln-lokal-6bd98d42ab9c@brauner>
Date: Mon, 4 Aug 2025 14:21:17 +0200
From: Christian Brauner <brauner@...nel.org>
To: Jani Nikula <jani.nikula@...el.com>, 
	Thorsten Leemhuis <linux@...mhuis.info>
Cc: Andy Mindful <andy.mindful@...il.com>, 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

On Mon, Aug 04, 2025 at 11:15:46AM +0300, Jani Nikula wrote:
> On Sun, 03 Aug 2025, Andy Mindful <andy.mindful@...il.com> wrote:
> > Here what I have from bisecting, please let me know if it makes things
> > clearer or not.
> 
> Doesn't point at graphics, anyway.
> 
> Cc: Christian.

No idea, the listmount() changes look completely unrelated and it's way
back in v6.8 so absolutely no clue. Should probably go talk to
hibernate/suspend/power people or talk to Thorsten to bisect this
further.

> 
> 
> BR,
> Jani.
> 
> 
> >
> > 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
> 
> -- 
> Jani Nikula, Intel