(gdb) bt
#0  pthread_allocate_stack (attr=0x40432a0c, default_new_thread=0x0, pagesize=4096, out_new_thread=0x8120ca0, 
    out_new_thread_bottom=0x8120ca4, out_guardaddr=0x8120ca8, out_guardsize=0x8120cac) at ../sysdeps/i386/i486/bits/string.h:316
#1  0x4003cf07 in pthread_handle_create (thread=0x40432c50, attr=0x40432a0c, start_routine=0x40ba8364 <changethread>, 
    arg=0x81dc278, mask=0x8120d18, father_pid=13440, report_events=0, event_maskp=0x40432dac) at manager.c:543
#2  0x4003c9c5 in __pthread_manager (arg=0x3) at manager.c:167