(gdb) bt full
#0  0xffffe410 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb7d4c3e1 in __lll_mutex_unlock_wake () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/lowlevellock.S:212
No locals.
#2  0xb7d492ff in _L_mutex_unlock_128 () from /lib/tls/i686/cmov/libpthread.so.0
No symbol table info available.
#3  0xb4e16338 in ?? ()
No symbol table info available.
#4  0xb5711cf7 in event_set (handle=0x407) at handles-private.h:290
        _buffer = {__routine = 0xb57101b4 <mono_mutex_unlock_in_cleanup>, __arg = 0xb57a2714, __canceltype = -1260297512, __prev = 0x1}
        event_handle = (struct _WapiHandle_event *) 0xb5712da8
        ok = 1
        __func__ = "event_set"
        __PRETTY_FUNCTION__ = "event_set"
#5  0xb5711cf7 in event_set (handle=0xb7d492ff) at handles-private.h:290
        _buffer = {__routine = 0xb5710473 <_wapi_handle_unlock_handle>, __arg = 0x407, __canceltype = 135029664, __prev = 0xb4e16420}
        event_handle = (struct _WapiHandle_event *) 0xb5323350
        ok = 1
        __func__ = "event_set"
        __PRETTY_FUNCTION__ = "event_set"
#6  0xb5711fdc in SetEvent (handle=0x407) at events.c:738
No locals.
#7  0xb56c16b5 in finalizer_thread (unused=0x0) at gc.c:744
No locals.
#8  0xb56d79cc in start_wrapper (data=0x80c6138) at threads.c:305
        start_func = (guint32 (*)(void *)) 0xb56c1688 <finalizer_thread>
        start_arg = (void *) 0x0
        tid = 3034672048
        thread = (MonoThread *) 0x21d80
        start_delegate = (MonoObject *) 0x0
        __PRETTY_FUNCTION__ = "start_wrapper"
#9  0xb5721751 in thread_start_routine (args=0xb51f542c) at threads.c:192
        thr_ret = 1
        __PRETTY_FUNCTION__ = "thread_start_routine"
#10 0xb573aea2 in GC_start_routine (arg=0x1) at pthread_support.c:1331
        _buffer = {__routine = 0xb573b532 <GC_thread_exit_proc>, __arg = 0x0, __canceltype = 0, __prev = 0x0}
        dummy = 0
        result = (void *) 0x0
        me = 0x45800
        start = 0xb5721647 <thread_start_routine>
        start_arg = (void *) 0xb51f542c
#11 0xb7d47361 in start_thread (arg=0xb4e16bb0) at pthread_create.c:261
        __res = (void *) 0x1
        __ignore1 = -1255001336
        __ignore2 = -1210792991
        pd = (struct pthread *) 0xb4e16bb0
        now = The value of variable 'now' is distributed across several
locations, and GDB cannot access its value.