x/build: LUCI test results confusingly interleaved in output log

[bcmills]

Go version

962dade

What operating system and processor architecture are you using (go env)?

N/A

What did you do?

Open the “output” link from https://ci.chromium.org/ui/p/golang/builders/ci/gotip-linux-ppc64le/b8761885530407028657/steps.

What did you expect to see?

An output file containing a log matching the snippet shown in https://ci.chromium.org/ui/p/golang/builders/ci/gotip-linux-ppc64le/b8761885530407028657/test-results?sortby=&groupby=.

What did you see instead?

Output lines from two different tests (in this case cmd/cgo/internal/testshared and cmd/go) are shown interleaved, with no indication of which blocks of the log came from which test.

[thanm]

@golang/release

Looking at the raw log file, I see a total of 236248 lines; I can see output at line 99870 from a cmd/cgo/internal/testshared test and then the last line (notification of a timeout) is at 126409. In between I can see a great deal of cmd/go test output.