Q about crash

[Avi Drissman]

A new high-frequency crash just appeared deep inside gemmlowp code, which is deeply templated and not super understandable. A bisect seems to implicate my roll of the minimum required macOS version, which is odd, and we're not sure if that's a bad bisect or if it's real and something much more subtle is going on.

I email you folks as you're the compiler people. Do you have any thoughts as to what's going on here? Assuming this is indeed the macOS repin, and seeing that this is x64-only, and seeing that this code has nothing to do with macOS, something inside me says that this might be UB that is exposed to be crashing based on something tied to the minimum macOS version. That's honestly on the borderline of absurd and exactly what a compiler would do, but I don't have anything better.

Ideas? Thanks.

Avi

[Bruce Dawson]

Bug link?

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Bruce Dawson, he/him

[Avi Drissman]

crbug.com/1326455

A slight update, though. It turns out that gemmlowp is unsupported obsolete code and its author asked us to move to a different library.