Description of problem:
'pstack' has not been included in Fedora for ages (see https://koji.fedoraproject.org/koji/packageinfo?packageID=949 ).

I'm sure there's a replacement for it we can look at.

It is used in volume.rc:
function number_healer_threads_shd {
   local pid=$(get_shd_mux_pid $1)
   pstack $pid | grep $2 | wc -l
}