How to debug a segmentation fault

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How do I debug a segmentation fault?

Basically this is what happens:

I run my server in background: ./server &

then I run my client: ./client

When I try to login to my server, on correct username and password, everything is okay, but when I type invalid user and password, it results in a segmentation fault.

How do I make the compiler/debugger able to output what error its actually see that causes segmentation core dump.

I know gdb but I try using gdb client but it doesn't seem to work.

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