[Linux] Signal should not be block

The following signal should be deliverd on the thread that generated the original error. Blocking them interferes with proper recovery

   sigdelset(sig_mask, SIGABRT);
   sigdelset(sig_mask, SIGBUS);
   sigdelset(sig_mask, SIGEMT);
   sigdelset(sig_mask, SIGFPE);
   sigdelset(sig_mask, SIGILL);
   sigdelset(sig_mask, SIGIOT);
   sigdelset(sig_mask, SIGPIPE);
   sigdelset(sig_mask, SIGSEGV);
   sigdelset(sig_mask, SIGSYS);
   sigdelset(sig_mask, SIGTRAP);

待續...