. Thread 3 (process 7905): #0 0x00007f9181552e81 in nanosleep () from /lib/libpthread.so.0 #1 0x000000000050d3b4 in ?? () #2 0x00007f918154b3f7 in start_thread () from /lib/libpthread.so.0 #3 0x00007f9181039b7d in epoll_pwait () from /lib/libc.so.6 #4 0x0000000000000000 in ?? () . Thread 2 (process 7906): #0 0x00007f918154fb99 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0 #1 0x0000000000512582 in ?? () #2 0x00000000005128b0 in ?? () #3 0x0000000000512676 in ?? () #4 0x0000000000523dfc in ?? () #5 0x00000000004a91c0 in ?? () #6 0x00000000004c46da in ?? () #7 0x000000000052220c in ?? () #8 0x000000000053fc57 in ?? () #9 0x00007f918154b3f7 in start_thread () from /lib/libpthread.so.0 #10 0x00007f9181039b7d in epoll_pwait () from /lib/libc.so.6 #11 0x0000000000000000 in ?? () . Thread 1 (process 7904): #0 0x00007f9180fa6634 in vfprintf () from /lib/libc.so.6 #1 0x00007f9180faad53 in ?? () from /lib/libc.so.6 #2 0x00007f9180fa66b0 in vfprintf () from /lib/libc.so.6 #3 0x00007f9180fafe88 in printf () from /lib/libc.so.6 #4 0x000000000058de3f in ?? () #5 0x000000000058c404 in ?? () #6 0x000000000058c503 in ?? () #7 0x000000000058ded7 in ?? () #8 0x000000000046a070 in ?? () #9 0x000000000056eb60 in ?? () #10 #11 0x00007f9180fdeda0 in memcpy () from /lib/libc.so.6 #12 0x000000000046575c in mono_breakpoint_clean_code () #13 0x000000000046a534 in ?? () #14 0x000000000046e040 in ?? () #15 0x0000000041ca015b in ?? () #16 0x0000000100ab7430 in ?? () #17 0x0000000000957888 in ?? () #18 0x00007fff8a24b7b0 in ?? () #19 0x000000000050a6a7 in mono_class_get_method_from_name_flags () #20 0x0000000041c7700d in ?? () #21 0x0000000000000000 in ?? ()