This might help shed some light:
$ cd t/pmc $ parrot nci_1.pasm
Not really. bash: parrot: command not found ;) You got an old parrot around somewhere in the path?
$ parrot --gc-debug nci_1.pasm Segmentation fault (core dumped)
Well, I just don't have these segfaults. Wait ... Oops, I've turned on incremental GC here, which could make it succeed. Recompiling ... another coffee ...
No. All NCI tests are running fine here with --gc-debug
leo