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Bug#1125405: Fwd: linux-image-6.12.63+deb13-amd64: Cannot mount cephfs

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Hi Reinhard,

On Sun, Jan 25, 2026 at 05:26:22PM +0100, Salvatore Bonaccorso wrote:
> Control: tags -1 + upstream 
> Control: forwarded -1 https://tracker.ceph.com/issues/73886 https://lore.kernel.org/ceph-devel/20260114195524.1025067-2-slava@dubeyko.com/
> 
> Hi Reinhard,
> 
> On Sun, Jan 25, 2026 at 11:22:52AM +0100, Reinhard Eilmsteiner wrote:
> > OK, I just restarted
> > 
> > FYI, I have create this script to build kernels:
> > #!/bin/bash
> > 
> > cd /home/eilmrein/code/linux-stable
> > git checkout $1
> > cp /boot/config-$(uname -r) .config
> > yes '' | make localmodconfig
> > ./scripts/config --module CEPH_FS
> > ./scripts/config --module CEPH_LIB
> > ./scripts/config --enable CEPH_FSCACHE
> > ./scripts/config --enable CEPH_FS_POSIX_ACL
> > make savedefconfig
> > mv defconfig arch/x86/configs/my_defconfig
> > make my_defconfig
> > make -j $(nproc) bindeb-pkg
> > 
> > After having run it with v6.12.58 as argument, I installed the resulting
> > kernel using
> > sudo dpkg -i linux-image-6.12.58_6.12.58-16_amd64.deb
> > 
> > Booted into it and did a quick ls on one of the cephfs, which I have systemd
> > automount for me - however it also fails when I try to mount it manually , I
> > get
> > natchez➜ codels /remote/vdl/files01
> > [1]    2647 killed     ls --color=tty /remote/vdl/files01
> > 
> > , did the requested git bisect bad
> > 
> > and as it is the immediate successor, I now ran this right after making the
> > current kernel as bad.
> > 
> > git bisect start
> > # status: waiting for both good and bad commits
> > # good: [8a243ecde1f6447b8e237f2c1c67c0bb67d16d67] Linux 6.12.57
> > git bisect good 8a243ecde1f6447b8e237f2c1c67c0bb67d16d67
> > # status: waiting for bad commit, 1 good commit known
> > # bad: [567bd8cbc2fe6b28b78864cbbbc41b0d405eb83c] Linux 6.12.63
> > git bisect bad 567bd8cbc2fe6b28b78864cbbbc41b0d405eb83c
> > # bad: [7475d784169c7df48b0c55525fb862e06674d63c] Linux 6.12.58
> > git bisect bad 7475d784169c7df48b0c55525fb862e06674d63c
> 
> This is still not the bisect procedure :).
> 
> The next ommit pointed out by the procedure to bisec would be
> 850c7f0537cc5a37ed012592907920637cc548b6 . You need to build with that
> commit up a kernel, boot into it, test if ceph mount works or not and
> based on the result mark it with 'git bisect bad' or 'git bisect
> good'. Git will then calculate you the next commit to test, and you
> interate until you get 'the first bad commit' result. We need to have
> that (or worst case a range, if you needed to skip one).
> 
> But in meahwhile I have found an upstream repot which matches your
> report:
> 
> https://tracker.ceph.com/issues/73886
> https://lore.kernel.org/ceph-devel/20260114195524.1025067-2-slava@dubeyko.com/
> 
> So it would be great if you instead could built the current kernel in
> trixie with this patch added on top.
> 
> The procedure for this one is documented in
> https://kernel-team.pages.debian.net/kernel-handbook/ch-common-tasks.html#id-1.6.6.4
> but let me know if you need help with that.

Let's shortcut that step, I have built *test* packages at
https://people.debian.org/~carnil/tmp/linux/1125405-cephfs/ (if you
want to trust them, unsigned, but I have put a sha256sum file for
those signed with my gpg key in the Debian keyring).

Please report back if that fixes the problem.

Regards,
Salvatore

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Bug#1125405: Fwd: linux-image-6.12.63+deb13-amd64: Cannot mount cephfs Salvatore Bonaccorso <carnil@debian.org> - 2026-01-17 21:20 +0100
  Bug#1125405: Fwd: linux-image-6.12.63+deb13-amd64: Cannot mount cephfs Salvatore Bonaccorso <carnil@debian.org> - 2026-01-24 14:20 +0100
    Bug#1125405: Fwd: linux-image-6.12.63+deb13-amd64: Cannot mount cephfs Salvatore Bonaccorso <carnil@debian.org> - 2026-01-25 09:30 +0100
      Bug#1125405: Fwd: linux-image-6.12.63+deb13-amd64: Cannot mount cephfs Salvatore Bonaccorso <carnil@debian.org> - 2026-01-25 18:10 +0100

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