Slava, I just put the details in the bug report https://tracker.ceph.com/issues/75609 .  The kernels I was able to reproduce the issue on were the proxmox supplied 6.17.13-1-pve, and 6.14.11-5-pve, and the Pop!_OS kernel version 6.18.7-76061807-generic.  The problem didn't happen on a different machine running CachyOS kernel 6.19.6-2-cachyos. All I needed to do to reproduce the problem was go to the cephfs mountpoint (/mnt/ceph) and run find -maxdepth 3 -type d -exec ls "{}/.snap/" \; which should have listed snapshots from about 1015 directories.  This wasn't the smartest way to find snapshots, it was just the first one I thought of. Each time the effect is a little different.  Sometimes it immediately panics, sometimes the machine just gets slow for a few minutes with lots of errors being logged before it panics. Thanks, Alain On 2026-03-18 13:07, Viacheslav Dubeyko wrote:

Hi Alain,

The ceph-devel@vger.kernel.org is the email list for sharing issues in CephFS kernel client.

I remember that we had the fix for likewise issue recently. Could you please share which kernel version you have? Which particular call trace do you have for this kernel panic? How anybody can reproduce the issue?

Thanks, Slava.

On Wed, 2026-03-18 at 15:17 +0530, Venky Shankar wrote:

...

cc Alex/Slava (cephfs kernel driver maintainers)

On Wed, Mar 18, 2026 at 3:35 AM Alain Bertrand via ceph-users <ceph-users@ceph.io> wrote:

...

Hi.

I'm new here. I have been playing with ceph for a few years (nothing dramatic, just using it in my proxmox cluster to store VM images and host a cephfs with a lot of shared files). I think I found a bug in the cephfs client in the Linux kernel. Listing snapshots (ls .snap) in a lot of directories quickly causes a kernel panic. I tried to create an account on the bug tracker at tracker.ceph.com a week ago, but still can't log in there. Do I put details here, or report somewhere else? What's the next step I should take?

Thanks,

Alain _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io