[Bug 2115379] [NEW] CephFS mount with native kernel client fails with 'secret is not valid base64' on Ubuntu 24.04 (6.8.0-62-generic), but ceph-fuse works

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Environment Details:

Ceph Cluster Version: Ceph Reef 18.2.7

Worker Node OS: Ubuntu 24.04 Noble Numbat

Worker Node Kernel Version: uname -r -> 6.8.0-62-generic

ceph-common Package Version: apt show ceph-common ->
19.2.0-0ubuntu0.24.04.2

Monitor Network: (e.g., 192.168.6.x on a dedicated NIC)


Problem Description

Attempted to mount CephFS using the native kernel client (mount -t ceph
... or fstab).

Consistently received the error: secret is not valid base64: Invalid
argument. adding ceph secret key to kernel failed: Invalid argument
couldn't append secret option: -22

This error occurred for both a custom user (client.docker_worker01) and
the client.admin user.


ceph-fuse works perfectly: sudo ceph-fuse -m ... successfully mounts the filesystem with the same keyring file that fails with the native client. 

dmesg -T showed no relevant error messages for the failed mount attempt.

initial cat -vET output of keyring file showed non-standard spaces, but
even after attempts to ensure a clean file (scp, direct pipe, manual
retyping) the kernel client still failed while ceph-fuse succeeded,
suggesting the file was indeed clean for ceph-fuse but something else
was problematic for the kernel.

Steps to Reproduce:

Command "sudo mount -t ceph 192.168.6.101:/cephfs /mnt/dir -o
name=admin,secretfile=/etc/ceph/ceph.client.admin.keyring,noatime,_netdev"
fails, reporting an issue with the key not being in base64.

Command "sudo ceph-fuse -m 192.168.6.101 -r /cosdata/dir -n client.admin
--keyring=/etc/ceph/ceph.client.admin.keyring /mnt/dir" is successful
and my mount succeeds.


Expected Behavior: CephFS should mount successfully using the native kernel client.

Actual Behavior: CephFS fails to mount with the native kernel client.

Workaround: ceph-fuse is being used as a workaround, with the same
base64 secret file that native Ceph rejects.

** Affects: ceph (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment ceph
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CephFS mount with native kernel client fails with 'secret is not valid base64' on Ubuntu 24.04 (6.8.0-62-generic), but ceph-fuse works
https://bugs.launchpad.net/bugs/2115379
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