Duplicate cifs mounts are caused when mount -a or duplicate mount command is invoked with no 'vers=' option
Issue
- If we run 'mount -a' multiple times then the same cifs share is mounted multiple times at the same mountpoint.
- Multiple identical mount commands cifs share should error out with
mount error(16): Device or resource busy
but the mount completes fine and duplicate mounts are seen in /proc/mounts
Environment
- Red Hat Enterprise Linux 8.1
- seen on kernel-4.18.0-147.el8 or above
- cifs
- no 'vers=' line specified when 'mount' command is given
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