linux-kernel - Re: Commit *pidfd: prevent creation of pidfds for kthreads* causes `Failed to remount '/' read-only: Device or resource busy`

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <b21aa149-fd70-4aa0-9b25-886c81ebfae2@leemhuis.info>
Date: Tue, 20 Aug 2024 07:03:45 +0200
From: Thorsten Leemhuis <regressions@...mhuis.info>
To: Paul Menzel <pmenzel@...gen.mpg.de>,
 Christian Brauner <brauner@...nel.org>
Cc: linux-kernel@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: Commit *pidfd: prevent creation of pidfds for kthreads* causes
 `Failed to remount '/' read-only: Device or resource busy`

On 19.08.24 23:02, Paul Menzel wrote:
> #regzbot introduced: 3b5bbe798b24
> 
> Commit 3b5bbe798b24 (pidfd: prevent creation of pidfds for kthreads)
> causes a regression. On the Dell XPS 13 9360 with Debian sid/unstable
> and *systemd* 256.5-1, systemd is not able to unmount the root partition
> (LUKS encrypted) anymore.

Hi Paul! Thx for the report. FWIW, a revert to fix this is already
queued as 780d60bac21ebe ("Revert "pidfd: prevent creation of pidfds for
kthreads"") [next-20240820 (pending-fixes)] after Eric reported similar
problems recently:

https://lore.kernel.org/all/20240819-staudamm-rederei-cb7092f54e76@brauner/

Ciao, Thorsten

#regzbot fix: 780d60bac21ebe