Program received signal SIGSEGV, Segmentation fault.0x00000000005c647b in ?? ()(gdb) bt#0 0x00000000005c647b in ?? ()#1 0x00000000005c84c7 in ?? ()#2 0x0000000000912b7c in ?? ()#3 0x00000000004104ea in pthread_cancel ()#4 0x000000000040a45d in pthread_cancel ()#5 0x0000000000443cae in pthread_cancel ()#6 0x000000000046dcf8 in pthread_cancel ()#7 0x000000000046e89d in pthread_cancel ()#8 0x0000000000427f5d in pthread_cancel ()#9 0x000000000042839f in pthread_cancel ()#10 0x0000000000428ef7 in pthread_cancel ()#11 0x00000034ef41d994 in __libc_start_main () from /lib64/libc.so.6#12 0x000000000040a1a9 in pthread_cancel ()#13 0x00007fffd3681a58 in ?? ()#14 0x0000000000000000 in ?? ()