kdump: capturing kernel crash dump sometimes fails due to failure of mounting filesystem for crash dump saving area

Issue

Capturing kernel crash dump sometimes fails due to failure of mounting filesystem for crash dump saving area. When this issue occurs, there are the following messages in console:

    systemd[1]: Mounting /var/crash...
    systemd[1]: var-crash.mount: Mount process finished, but there is no mount.
    systemd[1]: var-crash.mount: Failed with result 'protocol'.
    systemd[1]: Failed to mount /var/crash.

where /var/crash is the file path at which crash dump file is created and the var-crash.mount is the mount unit corresponding to the mount point on /var/crash directory (*).

(*) The file path /var/crash is the default configuration of /etc/kdump.conf file. If you change it by path directive in /etc/kdump.conf file, the messages is altered accordingly.