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cmd/link: fingerprint mismatch when running tests with PGO and coverage #80891
Description
What version of Go are you using (go version)?
$ go version go version go1.26.6-X:nodwarf5 linux/amd64
Does this issue reproduce with the latest release?
Yes. Reproduced both on Arch Linux package and official Go distribution.
Also reproduced on gotip:
$ gotip version
go version go1.28-devel_372c766c Fri Aug 14 21:00:55 2026 -0700 linux/amd64
$ gotip test -cover ./cmd/tgfeed ./cmd/tgfeed/internal/sender
# go.astrophena.name/tools/cmd/tgfeed.test
/home/astrophena/sdk/gotip/pkg/tool/linux_amd64/link: fingerprint mismatch: go.astrophena.name/tools/cmd/tgfeed/internal/sender has bc5deceff2910599, import from go.astrophena.name/tools/cmd/tgfeed expecting 2e75f5eee2541f0b
FAIL go.astrophena.name/tools/cmd/tgfeed [build failed]
? go.astrophena.name/tools/cmd/tgfeed/internal/sender [no test files]
FAIL
What operating system and processor architecture are you using (go env)?
go env Output
$ go env AR='ar' CC='gcc' CGO_CFLAGS='-O2 -g' CGO_CPPFLAGS='' CGO_CXXFLAGS='-O2 -g' CGO_ENABLED='1' CGO_FFLAGS='-O2 -g' CGO_LDFLAGS='-O2 -g' CXX='g++' GCCGO='gccgo' GO111MODULE='' GOAMD64='v1' GOARCH='amd64' GOAUTH='netrc' GOBIN='/home/astrophena/local/bin' GOCACHE='/home/astrophena/local/cache/go/cache' GOCACHEPROG='' GODEBUG='' GOENV='/home/astrophena/code/prefs/go/env' GOEXE='' GOEXPERIMENT='nodwarf5' GOFIPS140='off' GOFLAGS='-modcacherw' GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1205003816=/tmp/go-build -gno-record-gcc-switches' GOHOSTARCH='amd64' GOHOSTOS='linux' GOINSECURE='' GOMOD='/home/astrophena/code/tools/go.mod' GOMODCACHE='/home/astrophena/local/cache/go/mod' GONOPROXY='go.home.astrophena.name/*' GONOSUMDB='go.home.astrophena.name/*' GOOS='linux' GOPATH='/home/astrophena/local/data/go' GOPRIVATE='go.home.astrophena.name/*' GOPROXY='https://proxy.golang.org,direct' GOROOT='/usr/lib/go' GOSUMDB='sum.golang.org' GOTELEMETRY='off' GOTELEMETRYDIR='/home/astrophena/code/prefs/go/telemetry' GOTMPDIR='' GOTOOLCHAIN='auto' GOTOOLDIR='/usr/lib/go/pkg/tool/linux_amd64' GOVCS='' GOVERSION='go1.26.6-X:nodwarf5' GOWORK='' PKG_CONFIG='pkg-config' uname -sr: Linux 7.1.8-arch1-3 /usr/lib/libc.so.6: GNU C Library (GNU libc) stable release version 2.44. gdb --version: GNU gdb (GDB) 17.2
What did you do?
Tried to run tests on one of my repos, where I have PGO profile in one of the programs:
$ git clone https://github.com/astrophena/tools
$ git checkout f483f21
$ cd tools
# Fails.
$ go test -cover ./cmd/tgfeed ./cmd/tgfeed/internal/sender
# Both pass.
$ go test -cover -pgo=off ./cmd/tgfeed ./cmd/tgfeed/internal/sender
$ go test -cover -pgo=cmd/tgfeed/default.pgo ./cmd/tgfeed ./cmd/tgfeed/internal/sender
What did you expect to see?
ok go.astrophena.name/tools/cmd/tgfeed 0.041s coverage: 77.9% of statements
? go.astrophena.name/tools/cmd/tgfeed/internal/sender [no test files]
What did you see instead?
# go.astrophena.name/tools/cmd/tgfeed.test
/usr/lib/go/pkg/tool/linux_amd64/link: fingerprint mismatch: go.astrophena.name/tools/cmd/tgfeed/internal/sender has 3b958f7fcb68ee9a, import from go.astrophena.name/tools/cmd/tgfeed expecting ff682270e9bfc225
FAIL go.astrophena.name/tools/cmd/tgfeed [build failed]
? go.astrophena.name/tools/cmd/tgfeed/internal/sender [no test files]
FAIL
May be related to #61376.
Activity
gabyhelp commentedon Aug 15, 2026
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(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)
fix(build): run coverage tests with -pgo=off around golang/go#80891
Merge pull request #779 from JPL-Devin/devin/1788328388-pgo-performan…