Process terminating with default action of signal 11 (SIGSEGV) Access not within mapped region at address 0x........ at 0x........: main (block_all_signals.c:28) If you believe this happened as a result of a stack overflow in your program's main thread (unlikely but possible), you can try to increase the size of the main thread stack using the --main-stacksize= flag. The main thread stack size used in this run was ....