segfault in cmpLocks on 64 bit multicore
GHC's runtime file locking breaks under high volume usage. Under high enough volume it segfaults as such:
#0 0x0000000000437555 in cmpLocks () #1 0x000000000044a4c9 in lookupHashTable () #2 0x0000000000437641 in lockFile () #3 0x00000000004246cf in base_GHCziHandle_zdLr5QQzdwccall_info () #4 0x0000000000000000 in ?? ()
Under lower load, at times it will simply hang.
(Note, the testfile is intended to be run with a directory "foo" in the current working directory, and with that directory filled with roughly 10000 numbered copies of a usefully large file. For the tests I ran, I chose the first chapter of "A Tale of Two Cities.")