cmd/go: TestScript/repro_build failures

[gopherbot]

#!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/repro_build"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestScript/repro_build
=== PAUSE TestScript/repro_build
=== CONT  TestScript/repro_build
    script_test.go:138: 2026-03-11T03:21:01Z
    script_test.go:140: $WORK=/home/swarming/.swarming/w/ir/x/t/cmd-go-test-3206328536/tmpdir436734002/repro_build921176627
2026/03/11 03:21:02 hello.txt:
> handle git
> env GIT_AUTHOR_NAME=bwk
> env GIT_AUTHOR_EMAIL=bwk
> env GIT_COMMITTER_NAME='Russ Cox'
...
        > env GOMAXPROCS=16
        > go build -a -o http16.o net/http
        > env GOMAXPROCS=17
        > go build -a -o http17.o net/http
        > cmp -q http16.o http17.o
        > env GOMAXPROCS=18
        > go build -a -o http18.o net/http
        > cmp -q http16.o http18.o
    script_test.go:162: FAIL: testdata/script/repro_build.txt:12: cmp -q http16.o http18.o: http16.o and http18.o differ
--- FAIL: TestScript/repro_build (75.66s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/repro_build"

2026-03-11 03:06 gotip-linux-amd64-longtest go@3694f336 cmd/go.TestScript/repro_build (log)

=== RUN   TestScript/repro_build
=== PAUSE TestScript/repro_build
=== CONT  TestScript/repro_build
    script_test.go:138: 2026-03-11T03:21:01Z
    script_test.go:140: $WORK=/home/swarming/.swarming/w/ir/x/t/cmd-go-test-3206328536/tmpdir436734002/repro_build921176627
2026/03/11 03:21:02 hello.txt:
> handle git
> env GIT_AUTHOR_NAME=bwk
> env GIT_AUTHOR_EMAIL=bwk
> env GIT_COMMITTER_NAME='Russ Cox'
...
        > env GOMAXPROCS=16
        > go build -a -o http16.o net/http
        > env GOMAXPROCS=17
        > go build -a -o http17.o net/http
        > cmp -q http16.o http17.o
        > env GOMAXPROCS=18
        > go build -a -o http18.o net/http
        > cmp -q http16.o http18.o
    script_test.go:162: FAIL: testdata/script/repro_build.txt:12: cmp -q http16.o http18.o: http16.o and http18.o differ
--- FAIL: TestScript/repro_build (75.66s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/repro_build"

2026-03-12 15:09 gotip-windows-amd64-longtest go@b8cdabcf cmd/go.TestScript/repro_build (log)

=== RUN   TestScript/repro_build
=== PAUSE TestScript/repro_build
=== CONT  TestScript/repro_build
    script_test.go:138: 2026-03-12T16:32:51Z
    script_test.go:140: $WORK=C:\b\s\w\ir\x\t\cmd-go-test-1668886211\tmpdir3505101384\repro_build2919915189
    script_test.go:162: 
        PATH=C:\b\s\w\ir\x\t\cmd-go-test-1668886211\tmpdir3505101384\testbin;C:\b\s\w\ir\x\w\goroot\bin;C:\b\s\w\ir\x\w\goroot\bin;C:\b\s\w\ir\x\w\goroot\bin;C:\b\s\w\ir\cache\tools\bin;C:\b\s\w\ir\bbagent_utility_packages;C:\b\s\w\ir\bbagent_utility_packages\bin;C:\b\s\w\ir\cipd_bin_packages;C:\b\s\w\ir\cipd_bin_packages\bin;C:\b\s\w\ir\cache\cipd_client;C:\b\s\w\ir\cache\cipd_client\bin;C:\b\s\cipd_cache\bin;C:\Program Files\OpenSSH\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files\Puppet Labs\Puppet\bin;C:\Users\chrome-bot\AppData\Local\Microsoft\WindowsApps;C:\b\s\w\ir\cache\tools\cc\windows\gcc64\bin
        USERPROFILE=/no-home
        CCACHE_DISABLE=1
        GOARCH=amd64
...
        > env GOMAXPROCS=16
        > go build -a -o http16.o net/http
        > env GOMAXPROCS=17
        > go build -a -o http17.o net/http
        > cmp -q http16.o http17.o
        > env GOMAXPROCS=18
        > go build -a -o http18.o net/http
        > cmp -q http16.o http18.o
    script_test.go:162: FAIL: testdata\script\repro_build.txt:12: cmp -q http16.o http18.o: http16.o and http18.o differ
--- FAIL: TestScript/repro_build (94.38s)

— watchflakes

[khalidsaidi]

A2ABench has an accepted answer for this imported thread.

• Thread: https://a2abench-api.web.app/q/cmmlmm28j006q127jevaedxqq
• Accepted at: 2026-03-25T19:06:17.656Z
• Accepted answer agent: ai village
• Answer preview: "No matching threads were found for this query."