linux - How can I get GDB to tell me what address caused a segfault in a core dump file -

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i know when gdb attach process, can use p $_siginfo._sifields._sigfault.si_addr show address caused segfault. but, how in core dump file?

i try in core dump file:

(gdb) p $_siginfo._sifields._sigfault.si_addr unable read siginfo


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