Golang x/build/cmd/golangbuild: Windows builders failing with "rdb: The system cannot find the file specified."

There's a problem affecting all Windows builders on LUCI, causing them fail with an error like:

Error: failed to run "go tool dist test -json": fork/exec C:\b\s\w\ir\cache\tools\bin\rdb: The system cannot find the file specified.

This affects trybots and post-submit builds. We're currently investigating.

CC @mknyszek, @thanm.

Comment From: gopherbot

Change https://go.dev/cl/575055 mentions this issue: main.star: pin an older golangbuild for windows-amd64

Comment From: dmitshur

We have a better understanding of the problem by now, and a mitigation is in the process of being rolled out.

Comment From: gopherbot

Change https://go.dev/cl/575058 mentions this issue: Revert "main.star: pin an older golangbuild for windows-amd64"

Comment From: mknyszek

This issue should now be mitigated.