Comment 10 for bug 616027

I'm quite sure it has to do with library unloading, I'll attach a Debian bug pointing to that (and fixing it). Comments in the code suggest also problems with "buggy compilers" in this direction -- I don't think that linking or not linking pthread is the primary reason for this bug. The debian package does not link against pthread and doesn't have the segfault.

Interestingly, the debian package still has the patch to fix the bug I linked whereas in Ubuntu it seems to got lost somehow... I think syncing the latest debian package is the best solution.