Something

gdb) bt full
#0  0xb7d965ef in pthread_kill () from /lib/tls/i686/cmov/libpthread.so.0
No symbol table info available.
#1  0x080ac6d1 in unref_event (e=0x8189c90) at manager.c:645
        ret = (struct eventqent *) 0xb70044a0
#2  0x080b1459 in process_events (s=0x81c3098) at manager.c:1978
        eqe = (struct eventqent *) 0xb70044a0
        ret = 0
#3  0x080b1e61 in session_do (data=0x8196ab0) at manager.c:2192
        buf = 0xb6c5d3b0 ""
        res = 0
        m = {hdrcount = 0, headers = {'\0' <repeats 255 times> <repeats 80 times>}}
        ser = (struct server_instance *) 0x8196ab0
        s = (struct mansession *) 0x81c3098
        flags = 2050
        __PRETTY_FUNCTION__ = "session_do"
#4  0x080a15c4 in make_file_from_fd (data=0x8196ab0) at http.c:526
        ser = (struct server_instance *) 0x8196ab0
        __PRETTY_FUNCTION__ = "make_file_from_fd"
        cookie_funcs = {read = 0x80a13e6 <ssl_read>, write = 0x80a1410 <ssl_write>, seek = 0, close = 0x80a1431 <ssl_close>}
#5  0x080fa4f9 in dummy_start (data=0x818edd0) at utils.c:545
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {-1210462220, 0, 0, -1228528520, 1238115344, -150625079}, __mask_was_saved = 0}}, __pad = {0xb6c624b0, 0x0, 0x0, 0x0}}
        __cancel_routine = (void (*)(void *)) 0x80694f9 <ast_unregister_thread>
        __cancel_arg = (void *) 0xb6c62ba0
        not_first_call = 0
        ret = (void *) 0x0
        a = {start_routine = 0x80a1467 <make_file_from_fd>, data = 0x8196ab0, name = 0x81b3350 "make_file_from_fd    started at [  696] http.c server_root()"}
#6  0xb7d92504 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
No symbol table info available.
#7  0xb7bc251e in clone () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
(gdb)