JNLFSYNCLSTCK, Journaling fsync lock is stuck in journal file jjjj
Run Time Error: This indicates that the system has been unable to write to the journal file for a long duration and information useful for debugging will be logged in the syslog. It is printed after one minute and two minutes, if sync has not occurred yet, after which there will be an FSYNCTIMEOUT error.
Action: No action required, unless accompanied by FSYNCTIMEOUT. If this message comes up frequently without FSYNCTIMEOUT, you might still want to check the disk subsystem for hardware or software problems.