On attempting a service failover we see the following in the pacemaker logs:

Sep 01 14:55:09.092 hostname.domain.name pacemaker-execd [25360] (log_op_output) info: exportfs-resource_stop_0[3192827] error output [ grep: Unmatched ( or ( ]

Looking at the sources for exportfs we believe this is caused by the function 'cleanup_export_cache()' which attempts to build a regular expression matching all possible fsid's for exported file systems and then compare to the contents of /proc/net/rpc/nfsd.export/content:

The line causing the issue is this:

fsid_re="fsid=(echo forall get_fsid|sed 's/ /|/g'),"

For two exports with fsids 1 and 2 this code results in fsid_re being set to:

fsid=(echo 1 2|sed 's/ /|/g'),

whereas I believe the intention was to set it to:

fsid=(1|2),