Comment 3 for bug 1318034

The _start() doesn't matter, but indeed the unknown symbol in the third frame breaks it. Report.crash_signature() expects all frames in the StacktraceTop to have a name, otherwise it rejects it (i. e. returns None).

I guess in those cases we need to fall back to using the StacktraceAddressSignature?

Does the log also have a list of the missing/mismatching debug symbols?