Hi,
By "blocked" you mean eating 100% cpu?
Could you run a ps -lwwww <pid_of_blocked_process> ?
If it's using 100% cpu it might mean the list that search_htable()
iterates on is corrupted and has become cyclic.
You could also try compiling with debugging options, e.g.:
make config mode=debug; make all
or
make config CC_EXTRA_OPTS="-O0" ; make all