cmd/go: TestScript/build_trimpath_cgo fails to decode dwarf on release-branch.go1.23

[dmitshur]

Go version

This affects Go 1.23.x only. The test passes on Go 1.24.x and at tip.

Output of go env in your module/workspace:

GOOS='darwin'
GOARCH='arm64'

What did you do?

Looked at the failing builds on the build dashboard, e.g., https://ci.chromium.org/b/8713515151815260705, and tried to run the the test locally on darwin/arm64. It reproduced the failure.

Note that the darwin-arm64-longtest builder where this reproduces was added recently in #73488. The same test passes on darwin-amd64-longtest builders (e.g., https://ci.chromium.org/ui/p/golang/builders/ci/go1.23-darwin-amd64-longtest/b8713515151301513937/test-results?q=cmd%2Fgo.TestScript%2Fbuild_trimpath_cgo).

What did you see happen?

Test fails with:

script_test.go:159: FAIL: testdata/script/build_trimpath_cgo.txt:13: go run ./list-dwarf hello.exe: exit status 1

Full log:

# Go 1.25-ish
$ GOTOOLCHAIN=local go test -v -count=1 -run='^TestScript$/^build_trimpath_cgo$' cmd/go
[...]
--- PASS: TestScript (0.04s)
    --- PASS: TestScript/build_trimpath_cgo (7.40s)
PASS
ok  	cmd/go	4.394s

$ GOTOOLCHAIN=go1.24.3 go test -v -count=1 -run='^TestScript$/^build_trimpath_cgo$' cmd/go
[...]
PASS
ok  	cmd/go	4.572s

$ GOTOOLCHAIN=go1.23.9 go test -v -count=1 -run='^TestScript$/^build_trimpath_cgo$' cmd/go
=== RUN   TestScript
vcs-test.golang.org rerouted to http://127.0.0.1:63038
https://vcs-test.golang.org rerouted to https://127.0.0.1:63039
go test proxy running at GOPROXY=http://127.0.0.1:63040/mod
=== RUN   TestScript/build_trimpath_cgo
=== PAUSE TestScript/build_trimpath_cgo
=== CONT  TestScript/build_trimpath_cgo
    script_test.go:135: 2025-05-29T23:06:13Z
    script_test.go:137: $WORK=/var/folders/s_/5sjqzr0j6xggz_xtzmq_8r4m00jwcj/T/cmd-go-test-3448253444/tmpdir137029120/build_trimpath_cgo3434210657
    script_test.go:159: 
        PATH=/var/folders/s_/5sjqzr0j6xggz_xtzmq_8r4m00jwcj/T/cmd-go-test-3448253444/tmpdir137029120/testbin:/Users/gopher/go/pkg/mod/golang.org/[email protected]/bin:[...]:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:[...]:/Library/Apple/usr/bin:/usr/local/go/bin:/Users/gopher/go/bin:/Users/gopher/bin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=arm64
        TESTGO_GOHOSTARCH=arm64
        GOCACHE=/Users/gopher/Library/Caches/go-build
        GOCOVERDIR=
        GODEBUG=
        GOEXE=
        GOEXPERIMENT=
        GOOS=darwin
        TESTGO_GOHOSTOS=darwin
        GOPROXY=http://127.0.0.1:63040/mod
        GOPRIVATE=
        GOROOT=/Users/gopher/go/pkg/mod/golang.org/[email protected]
        GOTRACEBACK=system
        TESTGO_GOROOT=/Users/gopher/go/pkg/mod/golang.org/[email protected]
        TESTGO_EXE=/var/folders/s_/5sjqzr0j6xggz_xtzmq_8r4m00jwcj/T/cmd-go-test-3448253444/tmpdir137029120/testbin/go
        TESTGO_VCSTEST_HOST=127.0.0.1:63038
        TESTGO_VCSTEST_TLS_HOST=127.0.0.1:63039
        TESTGO_VCSTEST_CERT=/var/folders/s_/5sjqzr0j6xggz_xtzmq_8r4m00jwcj/T/cmd-go-test-3448253444/vcstest199468596/cert.pem
        TESTGONETWORK=panic
        GOSUMDB=localhost.localdev/sumdb+00000c67+AcTrnkbUA+TU4heY3hkjiSES/DSQniBqIeQ/YppAUtK6
        GONOPROXY=
        GONOSUMDB=
        GOVCS=*:all
        devnull=/dev/null
        goversion=1.23.9
        CMDGO_TEST_RUN_MAIN=true
        HGRCPATH=
        GOTOOLCHAIN=auto
        newline=
        
        WORK=/var/folders/s_/5sjqzr0j6xggz_xtzmq_8r4m00jwcj/T/cmd-go-test-3448253444/tmpdir137029120/build_trimpath_cgo3434210657
        TEST_TELEMETRY_DIR=/var/folders/s_/5sjqzr0j6xggz_xtzmq_8r4m00jwcj/T/cmd-go-test-3448253444/tmpdir137029120/build_trimpath_cgo3434210657/telemetry
        TMPDIR=/var/folders/s_/5sjqzr0j6xggz_xtzmq_8r4m00jwcj/T/cmd-go-test-3448253444/tmpdir137029120/build_trimpath_cgo3434210657/tmp
        GOPATH=/var/folders/s_/5sjqzr0j6xggz_xtzmq_8r4m00jwcj/T/cmd-go-test-3448253444/tmpdir137029120/build_trimpath_cgo3434210657/gopath
        PWD=/var/folders/s_/5sjqzr0j6xggz_xtzmq_8r4m00jwcj/T/cmd-go-test-3448253444/tmpdir137029120/build_trimpath_cgo3434210657/gopath/src
        
        # This test builds a cgo binary and verifies the source directory path
        # does not appear in the binary, either literally or in compressed DWARF.
        # TODO(golang.org/issue/36072): ideally we should build a binary from identical
        # sources in different directories and verify the binary and all intermediate
        # files are identical. (0.000s)
        > [short] skip
        [condition not met]
        > [!cgo] skip
        [condition not met]
        # Check that the source path appears when -trimpath is not used. (1.242s)
        > go build -o hello.exe .
        > grep -q gopath[/\\]src hello.exe
        > go run ./list-dwarf hello.exe
        [stderr]
        2025/05/29 19:06:14 decoding dwarf section info at offset 0x5f2af: DW_FORM_strx with no .debug_str_offsets section
        exit status 1
    script_test.go:159: FAIL: testdata/script/build_trimpath_cgo.txt:13: go run ./list-dwarf hello.exe: exit status 1
--- FAIL: TestScript (0.04s)
    --- FAIL: TestScript/build_trimpath_cgo (1.25s)
FAIL
FAIL	cmd/go	1.795s
FAIL

What did you expect to see?

Passing test on Go 1.23 release branch, or skipped test if the failure is understood and it's better to skip.

The same test was also failing for @matloob in #70669 and was fixed in Go 1.24, but this appears to be a different issue in the same test.

CC @golang/command-line, @thanm. (Also FYI @mknyszek.)

[gabyhelp]

Related Issues

• cmd/go: local failure in TestScript/build_trimpath_cgo #70669 (closed)
• cmd/go: TestScript/gotoolchain_issue66175 fails on tip locally #67277 (closed)
• cmd/go: build failed #59694 (closed)
• cmd/go: build_trimpath test doesn't correctly test executable reproducibility #35435 (closed)
• cmd/go: failed to build if the testdata contains broken symlinks #53305 (closed)
• cmd/buildid: rewrite algorithm is broken #23181 (closed)
• cmd/link: Testing packages FAIL: TestDWARF/testprogcgo #34987 (closed)
• cmd/link: TestDWARF fails with the latest tip version #25392 (closed)

Related Code Changes

• cmd/link: emit a mach-o dwarf segment that dsymutil will accept
• cmd/go: make test binary builds reproducible

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