os: on Plan 9: stat mycmd: stat buffer too short

[ianlancetaylor]

When I ran a version of http://golang.org/cl/10809 on the plan9 trybot, it failed with

--- FAIL: TestGoInstallCleansUpAfterGoBuild (0.61s)
go_test.go:171: running testgo [build]
go_test.go:171: running testgo [install]
go_test.go:484: testgo install did not remove command binary error: stat mycmd: stat buffer too short

This is from https://storage.googleapis.com/go-build-log/0ec7ceac/plan9-386_37213075.log , though I'm not sure how long that will stick around.

The code that causes this error is simply

    if _, err := os.Stat(file); err == nil {
        t.Fatal(msg)
    } else if !os.IsNotExist(err) {
        t.Fatal(msg, "error:", err)
    }

os.Stat is returning an error that is not nil, and not IsNotExist(err), but is intead the relatively meaningless error "stat buffer too short".

I am going to modify the test to avoid the error. Recording this issue so that the problem can be fixed.

[bradfitz]

This is from https://storage.googleapis.com/go-build-log/0ec7ceac/plan9-386_37213075.log , though I'm not sure how long that will stick around.

Forever. It's in storage (Cloud storage!) and storage is cheap. The temporary URLs now have temporary in their name. They're in-process only because they stream live output. But I've filed #11141 for a better fix.

[0intro]

Thanks for reporting. Maybe that's related to issue #10911,
were the TestRemoveAllRace started to return this error
intermittently on the old builder around May 13.
I'll investigate further.

[gopherbot]

CL https://golang.org/cl/10900 mentions this issue.