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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.
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Use debuggers to diagnose segfaults Start your debugger with the command gdb core , and then use the backtrace command to see where the program was when it crashed. This simple trick will allow you to focus on that part of the code.
A common run-time error for C programs by beginners is a "segmentation violation" or "segmentation fault." When you run your program and the system reports a "segmentation violation," it means your program has attempted to access an area of memory that it is not allowed to access.
A segmentation fault occurs when a program attempts to access a memory location that it is not allowed to access, or attempts to access a memory location in a way that is not allowed (for example, attempting to write to a read-only location, or to overwrite part of the operating system).
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.
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