What does __interceptor_strchr do?

my function crashes(due to stack overrun) right after this machine instruction:

0x00000000004b1e4c <read_config+188>:  e8 3f 85 fa ff  callq  0x45a390 <__interceptor_strchr(char const*, int)>

What does __interceptor_strchr(char const*, int) do?

Solution

This looks like part of LLVM's AddressSanitizer error detector.

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