linux-kernel - Re: [btrfs] commit bc27d6f0aa0e4de184b617aceeaf25818cc646de breaks update-grub

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Date: Thu, 11 Jan 2024 16:50:56 +0100
From: David Sterba <dsterba@...e.cz>
To: Thorsten Leemhuis <regressions@...mhuis.info>
Cc: Anand Jain <anand.jain@...cle.com>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	Linux kernel regressions list <regressions@...ts.linux.dev>,
	linux-kernel@...r.kernel.org, Alex Romosan <aromosan@...il.com>,
	Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
	David Sterba <dsterba@...e.com>
Subject: Re: [btrfs] commit bc27d6f0aa0e4de184b617aceeaf25818cc646de breaks
 update-grub

On Thu, Jan 11, 2024 at 12:45:50PM +0100, Thorsten Leemhuis wrote:
> [Adding Anand Jain, the author of the culprit to the list of recipients;
> furthermore CCing the the Btrfs maintainers and the btrfs list; also
> CCing regression list, as it should be in the loop for regressions:
> https://docs.kernel.org/admin-guide/reporting-regressions.html]
> 
> On 08.01.24 15:11, Alex Romosan wrote:
> > Please Cc me as I am not subscribed to the list.
> > 
> > Running my own compiled kernel without initramfs on a lenovo thinkpad
> > x1 carbon gen 7.
> > 
> > Since version 6.7-rc1 i haven't been able to to a grub-update,
> >
> > instead i get this error:
> > 
> > grub-probe: error: cannot find a device for / (is /dev mounted?) solid
> > state drive
> > 
> > 6.6 was the last version that worked.
> > 
> > Today I did a git-bisect between these two versions which identified
> > commit bc27d6f0aa0e4de184b617aceeaf25818cc646de btrfs: scan but don't
> > register device on single device filesystem as the culprit. reverting
> > this commit from 6.7 final allowed me to run update-grub again.
> > 
> > not sure if this is the intended behavior or if i'm missing some other
> > kernel options. any help/fixes would be appreciated.
> > 
> > thank you.
> 
> Thanks for the report. To be sure the issue doesn't fall through the
> cracks unnoticed, I'm adding it to regzbot, the Linux kernel regression
> tracking bot:
> 
> #regzbot ^introduced bc27d6f0aa0e4de184b617aceeaf25818cc646de
> #regzbot title btrfs: update-grub broken (cannot find a device for / (is
> /dev mounted?))
> #regzbot ignore-activity

The bug is also tracked at https://bugzilla.kernel.org/show_bug.cgi?id=218353 .