Question

Plus, The program runs on a arm device running Linux， I can print out stack info and register values in the sig-seg handler I assign.
The problem is I can’t add -g option to the source file, since the bug may won’t reproduce due to performance downgrade.

Answer 1

Compiling with the -g option to gcc does not cause a “performance downgrade”. All it does is cause debugging symbols to be included; it does not affect the optimisation or code generation.

If you install your SIGSEGV handler using the sa_sigaction member of the sigaction struct passed to sigaction(), then the si_addr member of the siginfo_t structure passed to your handler contains the faulting address.