Comment 30 for bug 40285

I finally tracked it down, I think. The pthread code tries to load libgcc_s on pthread_exit(), and this dos not work when the effective user was changed -- many daemons switch from root to a restricted user, and that's one way to end up in this problem. If the library is loaded globally for the process before the user is changed, everything works.

This is a problem of the 'pthread_exit()' implementation (delayed/on-demand load of libgcc_s) and/or the 'mmap()' implementation in the kernel.