Go version

go version devel go1.25-f9ce1dddc2

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='ppc64'
GOBIN=''
GOCACHE='/tmp/.cache/go-build'
GOENV='/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='ppc64'
GOHOSTOS='aix'
GOINSECURE=''
GOMODCACHE='/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='aix'
GOPATH='/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/ramdisk8GB/workdir-host-aix-ppc64-osuosl/go1.4/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/ramdisk8GB/workdir-host-aix-ppc64-osuosl/go1.4/go/pkg/tool/aix_ppc64'
GOVCS=''
GOVERSION='go1.22.6'
GCCGO='gccgo'
GOPPC64='power8'
AR='ar'
CC='gcc'
CXX='g++'
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 -maix64 -pthread -mcmodel=large -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3547173959=/tmp/go-build -gno-record-gcc-switches'

What did you do?

Trigger go build using make.bash

What did you see happen?

WARNING: //go1.4/bin/go does not exist, found /ramdisk8GB/workdir-host-aix-ppc64-osuosl/go1.4/go/bin/go from env
WARNING: set /ramdisk8GB/workdir-host-aix-ppc64-osuosl/go1.4/go as GOROOT_BOOTSTRAP
Building Go cmd/dist using /ramdisk8GB/workdir-host-aix-ppc64-osuosl/go1.4/go. (go1.22.6 aix/ppc64)
Building Go toolchain1 using /ramdisk8GB/workdir-host-aix-ppc64-osuosl/go1.4/go.
Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
Building Go toolchain2 using go_bootstrap and Go toolchain1.
runtime: taggedPointerPack invalid packing: ptr=0xa000100007a6000 tag=0x1 packed=0x80003d300001 -> ptr=0x100007a6000 tag=0x1
fatal error: taggedPointerPack

runtime stack:
runtime.throw({0x100523730?, 0x10004dcd0?})
/ramdisk8GB/workdir-host-aix-ppc64-osuosl/go/src/runtime/panic.go:1089 +0x34 fp=0x11029b5e0 sp=0x11029b5a0 pc=0x1000823d4
runtime.taggedPointerPack(0xa000100007a6000, 0x1)
/ramdisk8GB/workdir-host-aix-ppc64-osuosl/go/src/runtime/tagptr_64bit.go:57 +0x118 fp=0x11029b628 sp=0x11029b5e0 pc=0x100067968
runtime.lfstackPack(...)
/ramdisk8GB/workdir-host-aix-ppc64-osuosl/go/src/runtime/lfstack.go:64
runtime.(*lfstack).push(0x11007cc48, 0xa000100007a6000)
/ramdisk8GB/workdir-host-aix-ppc64-osuosl/go/src/runtime/lfstack.go:26 +0x58 fp=0x11029b658 sp=0x11029b628 pc=0x10000ee48
runtime.gcBgMarkWorker.func1(0xa00010000792000?, 0x200000004?)
/ramdisk8GB/workdir-host-aix-ppc64-osuosl/go/src/runtime/mgc.go:1460 +0x90 fp=0x11029b688 sp=0x11029b658 pc=0x10007a700
runtime.park_m(0xa00010000792000)
/ramdisk8GB/workdir-host-aix-ppc64-osuosl/go/src/runtime/proc.go:4152 +0x214 fp=0x11029b6f8 sp=0x11029b688 pc=0x10004ddf4
runtime.mcall()
/ramdisk8GB/workdir-host-aix-ppc64-osuosl/go/src/runtime/asm_ppc64x.s:197 +0x54 fp=0x11029b720 sp=0x11029b6f8 pc=0x100088214

https://build.golang.org/log/b0bb703ed622f593e6503943cd1f134aaefcf49f

What did you expect to see?

The build break started after this change --> https://go-review.googlesource.com/c/go/+/665815