(gdb) t a a bt Thread 6 (Thread 249861 (LWP 14395)): #0 0xb7e2c87e in sigsuspend () from /lib/libc.so.6 #1 0xb7f5a879 in __pthread_wait_for_restart_signal () from /lib/libpthread.so.0 #2 0xb7f5ca36 in __pthread_alt_lock () from /lib/libpthread.so.0 #3 0xb7f58fd2 in pthread_mutex_lock () from /lib/libpthread.so.0 #4 0x080d09c8 in _wapi_lookup_handle (handle=0x6bc, type=WAPI_HANDLE_THREAD, shared=0xbf1ff380, private=0xbf1ff384) at ../../mono/io-layer/handles-private.h:106 #5 0x080e8aef in QueueUserAPC (apc_callback=0x80a91ac , handle=0x6bc, param=0x0) at threads.c:958 #6 0x080a9367 in mono_thread_request_interruption (running_managed=0) at threads.c:2334 #7 0x0811d294 in sigusr1_signal_handler (_dummy=35) at mini.c:9609 #8 0xb7f5af54 in pthread_sighandler () from /lib/libpthread.so.0 #9 0xb7e2c6b8 in sigaction () from /lib/libc.so.6 #10 0xb7f5a879 in __pthread_wait_for_restart_signal () from /lib/libpthread.so.0 #11 0xb7f5ca36 in __pthread_alt_lock () from /lib/libpthread.so.0 #12 0xb7f58fd2 in pthread_mutex_lock () from /lib/libpthread.so.0 #13 0xb7f574bd in pthread_cond_timedwait_relative () from /lib/libpthread.so.0 #14 0xb7f574ec in pthread_cond_timedwait () from /lib/libpthread.so.0 #15 0x080d4886 in _wapi_handle_timedwait_signal_handle (handle=0x402, timeout=0xbf1ff9d0) at handles.c:1649 #16 0x080e9cd2 in WaitForSingleObjectEx (handle=0x402, timeout=10000, alertable=1) at wait.c:111 #17 0x080a99c1 in async_invoke_thread (data=0x85c4210) at threadpool.c:309 #18 0x080a72ae in start_wrapper (data=0x9540f58) at threads.c:291 #19 0x080e9154 in timed_thread_start_routine (args=0x94fd8b0) at timed-thread.c:135 #20 0x080fc64f in GC_start_routine (arg=0x9211f80) at pthread_support.c:1237 #21 0xb7f580ba in pthread_start_thread () from /lib/libpthread.so.0 Thread 5 (Thread 244740 (LWP 14352)): #0 0xb7e2c87e in sigsuspend () from /lib/libc.so.6 #1 0xb7f5a879 in __pthread_wait_for_restart_signal () from /lib/libpthread.so.0 #2 0xb7f5ca36 in __pthread_alt_lock () from /lib/libpthread.so.0 #3 0xb7f58fd2 in pthread_mutex_lock () from /lib/libpthread.so.0 #4 0x080d0c01 in _wapi_lookup_handle (handle=0x681, type=WAPI_HANDLE_THREAD, shared=0xbf3ff3e0, private=0xbf3ff3e4) at ../../mono/io-layer/handles-private.h:106 #5 0x080e8aef in QueueUserAPC (apc_callback=0x80a91ac , handle=0x681, param=0x0) at threads.c:958 #6 0x080a9367 in mono_thread_request_interruption (running_managed=0) #7 0x0811d294 in sigusr1_signal_handler (_dummy=35) at mini.c:9609 #8 0xb7f5af54 in pthread_sighandler () from /lib/libpthread.so.0 #9 0xb7e2c6b8 in sigaction () from /lib/libc.so.6 #10 0xb7f5a853 in __pthread_wait_for_restart_signal () from /lib/libpthread.so.0 #11 0xb7f5ca36 in __pthread_alt_lock () from /lib/libpthread.so.0 #12 0xb7f58fd2 in pthread_mutex_lock () from /lib/libpthread.so.0 #13 0x080d34e4 in _wapi_handle_ops_own (handle=0x402) at ../../mono/io-layer/handles-private.h:106 #14 0x080e9c74 in WaitForSingleObjectEx (handle=0x402, timeout=10000, alertable=1) at wait.c:129 #15 0x080a99c1 in async_invoke_thread (data=0x85c4d80) at threadpool.c:309 #16 0x080a72ae in start_wrapper (data=0x829cb68) at threads.c:291 #17 0x080e9154 in timed_thread_start_routine (args=0x94e79c0) at timed-thread.c:135 #18 0x080fc64f in GC_start_routine (arg=0x91d9480) at pthread_support.c:1237 #19 0xb7f580ba in pthread_start_thread () from /lib/libpthread.so.0 Thread 4 (Thread 251907 (LWP 14398)): #0 0xb7f5ccd9 in __pthread_alt_unlock () from /lib/libpthread.so.0 #1 0xb7f592d3 in pthread_mutex_unlock () from /lib/libpthread.so.0 #2 0x080d3833 in _wapi_handle_count_signalled_handles (numhandles=5, handles=0xbf5ff850, waitall=1, retcount=0xbf5ff7b0, lowest=0xbf5ff7b4) at ../../mono/io-layer/handles-private.h:111 #3 0x080ea7c4 in test_and_own (numobjects=5, handles=0xbf5ff850, waitall=1, count=0xbf5ff7b0, lowest=0xbf5ff7b4) at wait.c:354 #4 0x080eae88 in WaitForMultipleObjectsEx (numobjects=5, handles=0xbf5ff850, waitall=1, timeout=10000, alertable=0) at wait.c:530 #5 0x080a8746 in wait_for_tids (wait=0xbf5ff850, timeout=10000) at threads.c:1613 #6 0x080a8ca5 in mono_threads_abort_appdomain_threads (domain=0x8d1a280, timeout=10000) at threads.c:1925 #7 0x080af59f in unload_thread_main (arg=0xbf3ff7ec) at appdomain.c:1277 #8 0x080e9154 in timed_thread_start_routine (args=0x9547688) at timed-thread.c:135 #9 0x080fc64f in GC_start_routine (arg=0x9211e40) at pthread_support.c:1237 #10 0xb7f580ba in pthread_start_thread () from /lib/libpthread.so.0 Thread 3 (Thread 1026 (LWP 12473)): #0 0xb7e2c87e in sigsuspend () from /lib/libc.so.6 #1 0xb7f5a879 in __pthread_wait_for_restart_signal () from /lib/libpthread.so.0 #2 0xb7f5ca36 in __pthread_alt_lock () from /lib/libpthread.so.0 #3 0xb7f58fd2 in pthread_mutex_lock () from /lib/libpthread.so.0 #4 0x080d09c8 in _wapi_lookup_handle (handle=0x408, type=WAPI_HANDLE_THREAD, shared=0xbf7ff980, private=0xbf7ff984) at ../../mono/io-layer/handles-private.h:106 #5 0x080e8b7b in _wapi_thread_apc_pending (handle=0x408) at threads.c:983 #6 0x080e9ce9 in WaitForSingleObjectEx (handle=0x404, timeout=4294967295, alertable=1) at wait.c:116 #7 0x08097ee5 in finalizer_thread (unused=0x0) at gc.c:671 #8 0x080a72ae in start_wrapper (data=0x8270f98) at threads.c:291 #9 0x080e9154 in timed_thread_start_routine (args=0x8270178) at timed-thread.c:135 #10 0x080fc64f in GC_start_routine (arg=0x81e1f00) at pthread_support.c:1237 #11 0xb7f580ba in pthread_start_thread () from /lib/libpthread.so.0 Thread 2 (Thread 2049 (LWP 12472)): #0 0xb7ecbbb0 in poll () from /lib/libc.so.6 #1 0xb7f57d96 in __pthread_manager () from /lib/libpthread.so.0 Thread 1 (Thread 1024 (LWP 12457)): #0 0xb7e2c87e in sigsuspend () from /lib/libc.so.6 #1 0xb7f5a879 in __pthread_wait_for_restart_signal () from /lib/libpthread.so.0 #2 0xb7f5ca36 in __pthread_alt_lock () from /lib/libpthread.so.0 #3 0xb7f58fd2 in pthread_mutex_lock () from /lib/libpthread.so.0 #4 0x080d2f09 in _wapi_handle_test_capabilities (handle=0x681, caps=WAPI_HANDLE_CAP_WAIT) at ../../mono/io-layer/handles-private.h:106 #5 0x080eab22 in WaitForMultipleObjectsEx (numobjects=2, handles=0x8415c38, waitall=1, timeout=4294967295, alertable=0) at wait.c:451 #6 0x080a8746 in wait_for_tids (wait=0x8415c38, timeout=4294967295) at threads.c:1613 #7 0x080a8a05 in mono_thread_manage () at threads.c:1762 #8 0x0805c639 in mono_main (argc=7, argv=0xbfffe824) at driver.c:891 #9 0x0805b194 in main (argc=7, argv=0xbfffe824) at main.c:6 #0 0xb7f5ccd9 in __pthread_alt_unlock () from /lib/libpthread.so.0