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Your backtrace shows that the segfault occurs in STL code, namely the basic_string allocator. It looks like some other code of yours has corrupted the heap memory management. That's a nasty bug because the corruption might have happened some time before, possibly even in a totally unrelated part of your program. Maybe you have overrun the bounds of an array/vector, or written to an uninitialized pointer that happens to refer to valid (but otherwise used) memory?

I'd try to comment out parts until the segfault disappears, then try to locate the culprit in that code part.