SetJmp/LongJmp: Why is this throwing a segfault?

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You can only longjmp() back up the call stack. The call to longjmp(b_buf, 1) is where things start to go wrong, because the stack frame referenced by b_buf no longer exists after the longjmp(a_buf).

From the documentation for longjmp:

The longjmp() routines may not be called after the routine which called the setjmp() routines returns.

This includes “returning” through a longjmp() out of the function.

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