cmd/compile, cmd/asm, x/sys/unix.test: unrecognized failures

[gopherbot]

#!watchflakes
default <- pkg == "golang.org/x/sys/unix.test" && test == ""

Issue created automatically to collect these failures.

Example (log):

# golang.org/x/sys/unix.test
link: internal error: R_DWTXTADDR_U1 relocation overflow on infosym for libc_setpriority_trampoline

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "golang.org/x/sys/unix.test" && test == ""

2025-03-05 15:56 x_sys-gotip-linux-amd64-misccompile sys@f2ce62c2 go@43648931 x/sys/unix.test (log)

# golang.org/x/sys/unix.test
link: internal error: R_DWTXTADDR_U1 relocation overflow on infosym for libc_setpriority_trampoline

— watchflakes

[ianlancetaylor]

CC @thanm Could this be related to the DWARF changes?

[thanm]

CC @thanm Could this be related to the DWARF changes?

Yup, " R_DWTXTADDR_U1 relocation overflow" is definitely DWARF 5 related, thanks. I will take a look.

[thanm]

Hmm, I am having trouble producing this. The command from the LUCI log is

 [I2025-03-12T01:24:12.094120Z 368 0 cmd_stream.go:492] rdb-stream: starting the test command - ["/home/swarming/.swarming/w/ir/cache/tools/bin/result_adapter" "go" "-v=false" "--" "/home/swarming/.swarming/w/ir/x/w/goroot/bin/go" "test" "-json" "-c" "-o" "/dev/null" "./..."]

however when I try something similar on my linux/amd box it works fine, e.g.

$ cd golang.org/x/sys/unix
$ GHOSTOOS=linux GOHOSTARCH=amd64 GOOS=darwin GOARCH=amd64 go test -x -c -count=1 -v  -o t.exe  -vet=off
$ file t.exe
t.exe: Mach-O 64-bit x86_64 executable, flags:<|DYLDLINK|PIE>
$

What am I missing? I am stumped.

[thanm]

Still not having any luck reproducing this. I'll wait and see if it happens again...

[johejo]

It seems this can be reproduced by building https://github.com/klauspost/reedsolomon/tree/master/examples with tip.

go version

Details

go version devel go1.25-b17a99d6fc Thu Mar 27 15:39:38 2025 -0700 linux/amd64

go env

Details

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=''
GOCACHE='/home/mitsuoheijo/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/home/mitsuoheijo/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build669280823=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/home/mitsuoheijo/repos/github.com/klauspost/reedsolomon/go.mod'
GOMODCACHE='/home/mitsuoheijo/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/home/mitsuoheijo/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/home/mitsuoheijo/repos/github.com/golang/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/home/mitsuoheijo/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/home/mitsuoheijo/repos/github.com/golang/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='devel go1.25-b17a99d6fc Thu Mar 27 15:39:38 2025 -0700'
GOWORK=''
PKG_CONFIG='pkg-config'

$ go build ./simple-encoder.go
# command-line-arguments
link: internal error: R_DWTXTADDR_U1 relocation overflow on infosym for github.com/klauspost/reedsolomon.mulAvxTwo_3x1_64Xor

[thanm]

It seems this can be reproduced by building https://github.com/klauspost/reedsolomon/tree/master/examples with tip.

Thanks. I will try to take a look later this week.

[gopherbot]

Change https://go.dev/cl/663235 mentions this issue: cmd: fix DWARF gen bug with packages that use assembly