cmd/go: go mod download segfault on linux/arm within QEMU on WSL2

[ProLoDs]

What version of Go are you using (go version)?

$ go version
go version go1.18.1 linux/arm

Does this issue reproduce with the latest release?

Run go mod download in Ubuntu22.04 with qemu 7.0 (http://ftp.de.debian.org/debian/pool/main/q/qemu/qemu-user-static_7.0+dfsg-7_amd64.deb) and get a segfault:

root@f683ddd33818:/build# go mod download
qemu: Unsupported syscall: 403
qemu: Unsupported syscall: 397
qemu: Unsupported syscall: 397
qemu: Unsupported syscall: 398
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
Segmentation fault
qemu: Unsupported syscall: 403
qemu: Unsupported syscall: 403

Note: This is was done in a Windows Docker environment with the WSL2 Kernel for docker. In a virtual machine running qemu, the go install ... crashes afterwards.

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE=""
GOARCH="arm"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="arm"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/root/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/root/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/lib/go-1.18"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go-1.18/pkg/tool/linux_arm"
GOVCS=""
GOVERSION="go1.18.1"
GCCGO="gccgo"
GOARM="6"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/build/go.mod"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -marm -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build914925232=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Just execute go mod download.

What did you expect to see?

Go mod download to download the packages

What did you see instead?

go mod download segfaulted.

[mvdan]

Please try with Go 1.18.3 first - your version is somewhat out of date and there have been numerous fixes since then.

[ProLoDs]

Same error:

root@0cfd94a25424:/build# /usr/local/go/bin/go mod download
qemu: Unsupported syscall: 403
qemu: Unsupported syscall: 397
qemu: Unsupported syscall: 397
qemu: Unsupported syscall: 397
qemu: Unsupported syscall: 398
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
Segmentation fault
qemu: Unsupported syscall: 403
root@0cfd94a25424:/build# /usr/local/go/bin/go version
qemu: Unsupported syscall: 403
qemu: Unsupported syscall: 397
qemu: Unsupported syscall: 397
qemu: Unsupported syscall: 397
qemu: Unsupported syscall: 398
go version go1.18.3 linux/arm
qemu: Unsupported syscall: 403

[seankhliao]

Are you running go inside user mode qemu inside a docker container on windows with a WSL2 backend?
Note user mode qemu isn't a supported platform

[ProLoDs]

Yes i'm running go inside a user mode qemu inside a docker with WSL2 backend.

[mvdan]

#1508 tracks actually supporting and testing user-mode qemu. Fixing that bug by adding a builder and making all tests pass would surely need to fix this problem as well, so I'm not sure that keeping more issues open is necessary. That issue already functions as an umbrella to track user-mode qemu support.

[bcmills]

Given the Unsupported syscall messages, this looks to me like a QEMU bug that happens to be triggered by running a Go program.

I suggest escalating it to the QEMU maintainers. I agree that there isn't anything we can plausibly do on the Go side without a fix (and active maintainer) for #1508.