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

$ go version
go version go1.21.3 openbsd/arm64

Does this issue reproduce with the latest release?

Yes, both go1.21.4 and master (commit: aa9dd50)

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

$ go env
GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='/home/r/.cache/go-build'
GOENV='/home/r/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='openbsd'
GOINSECURE=''
GOMODCACHE='/home/r/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='openbsd'
GOPATH='/home/r/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/openbsd_arm64'
GOVCS=''
GOVERSION='go1.21.3'
GCCGO='gccgo'
AR='ar'
CC='cc'
CXX='c++'
CGO_ENABLED='1'
GOMOD='/dev/null'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -pthread -fno-caret-diagnostics -Qunused-arguments -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build930530136=/tmp/go-build -gno-record-gcc-switches'

What did you do?

I tried building go from source with the following setup:

OpenBSD -current (18-Nov-2023)
QEMU master (commit: 34a5cb6d)
MacOS 14.1.1 (23B2082)
Apple M3 Max

sudo qemu-system-aarch64 \
-machine virt \
-cpu host \
-accel hvf \
-smp 4 \
-m 4096 \
-drive file=$disk,if=virtio,index=0,media=disk,format=qcow2 \
-drive file=$image,if=virtio,index=1,media=cdrom \
-nographic \
-nic vmnet-shared,mac=$mac,model=virtio-net-pci \
-bios /usr/local/share/qemu/edk2-aarch64-code.fd \
-serial pty \
-monitor none

What did you expect to see?

I expected a successful build.

What did you see instead?

./all.bash

Building Go cmd/dist using /usr/local/go. (go1.21.3 openbsd/arm64)
Building Go toolchain1 using /usr/local/go.
Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
Building Go toolchain2 using go_bootstrap and Go toolchain1.
go tool dist: FAILED: /home/r/src/go/pkg/tool/openbsd_arm64/go_bootstrap install -pgo=off cmd/asm cmd/cgo cmd/compile cmd/link: signal: illegal instruction (core dumped)

lldb go_bootstrap

* thread #1, stop reason = signal SIGILL
    frame #0: 0x00000000000800f0 go_bootstrap`_rt0_arm64_openbsd
go_bootstrap`_rt0_arm64_openbsd:
->  0x800f0 <+0>:  ldr    x0, [sp]
    0x800f4 <+4>:  add    x1, sp, #0x8
    0x800f8 <+8>:  bl     0x80100                   ; main
    0x800fc <+12>: udf    #0x0