Bug#650667: pthread_create fails with unknown signal
Jep exactly. All xulrunner and all webkit browsers started to crash when
booting -9 instead of -8.
This can be time-consuming, but it most likely can give useful
information. I would try using svn-bisect against FreeBSD repository
to find the regression. Since unpatched kernel is unbuildable on GNU
userland, this would require an FreeBSD system with Debian
First please try current stable-8 snapshot.
The problematic part might be already backported
or due to current toolchain.