0a185981ab
we can't do an SA context switch after all, we need to clear the sau from the LWP's arg. sa_switch() frees the sau in this case, but if we don't reset the LWP's state and the process exits, then the exiting LWP will try to free the sau again. also, change the sadebug printf stuff to use printf_nolog(), since otherwise we deadlock because we're already holding sched_lock and the normal printf() will try to wakeup the log reader.