[Bug 2115379] Re: 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

[paulw2u]

** Package changed: ubuntu => ceph (Ubuntu)

** Tags added: noble

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https://bugs.launchpad.net/bugs/2115379

Title:
  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

Status in ceph package in Ubuntu:
  New

Bug description:
  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.

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