b7b592d544
libgcc_s's __register_frame_info gets called from libc's CSU code before the libc constructors are run. __register_frame_info in turn calls pthread_mutex_lock. libpthread is not initialised at this point and therefore pthread__self() traps when deferencing the thread register. This worked before because the garbage from pthread__self() is effectively ignored.
$NetBSD: README,v 1.6 2009/04/16 18:37:30 wiz Exp $ When making changes to libpthread, please ensure that libpthread_dbg still compiles. Due to limitations in the current pthread implementation, makecontext(3) and sigaltstack(2) should not be used in programs which link against libpthread (whether threads are used or not). This has been noted in the makecontext(3), sigaltstack(2), and pthread(3) man pages.