Failing on linux opt.
Most likely introduced recently, let's track it down.

https://sponge.corp.google.com/invocation?id=880fd426-9165-47f3-9997-9b5a5e47c0a4
https://sponge.corp.google.com/invocation?id=c7a1d491-9b17-4dbe-a8ca-b72463aff084
https://sponge.corp.google.com/invocation?id=c7a1d491-9b17-4dbe-a8ca-b72463aff084
https://sponge.corp.google.com/invocation?id=908aa634-ff89-455d-8f4a-feece4fddf2f

First occurrence ever is here:
https://sponge.corp.google.com/invocation?id=86203bd0-1c62-42c7-89c9-3b0a084c6653