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cmd/compile: data race in concurrent compiler #20144
Thanks to the new racecompile builder (#19962), we have our first data race failure bug report for the new cmd/compile -c concurrent compilation:
It disturbs me that I haven't been able to reproduce this locally. My past experience is that such issues reproduce very readily.
It seems very likely that I've done this to myself, by packing Node.Used into a single field with other Node data, notably Class. But before attempting to fix it, I'd like to reproduce it...