Issue #1342 has been updated by Graham Agnew. Some progress on this: In the HP-UX documentation it says that on Itanium, PTHREAD_STACK_MIN is 256KB. But when I tracked the actual value doen in (limits.h), I found that it was only 4KB. Increasing this has solved the problem described in this ticket, however the test suite is now getting quite a few segmentation violation faults (SIGSEGV). So it's not solved just yet. ---------------------------------------- http://redmine.ruby-lang.org/issues/show/1342 ---------------------------------------- http://redmine.ruby-lang.org