I ran into similar segmentation faults in some long running processes which use Storable quite a lot. I am not sure my problems is related to what you mention, but at least on one machine I have your test program works fine and on another it does not. The one where it worked runs Storable 2.16 and the one where it fails runs 2.18. Downgrading to 2.16 on the machine that fails makes your test program run just fine. With some luck, this is indeed the same problem that make my programs segfault from time to time on another machine.