runtime: WinDBG can't unwind runtime.mcall

[qmuntal]

Go version

go version devel go1.23-0304d035cd Tue Apr 23 02:53:00 2024 +0000 windows/amd64

Output of go env in your module/workspace:

set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\qmuntaldiaz\AppData\Local\go-build
set GOENV=C:\Users\qmuntaldiaz\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\qmuntaldiaz\go\pkg\mod
set GONOPROXY=github.com/microsoft/*,dev.azure.com/*
set GONOSUMDB=github.com/microsoft/*,dev.azure.com/*
set GOOS=windows
set GOPATH=C:\Users\qmuntaldiaz\go
set GOPRIVATE=github.com/microsoft/*,dev.azure.com/*
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\Users\qmuntaldiaz\code\golang-go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLCHAIN=auto
set GOTOOLDIR=C:\Users\qmuntaldiaz\code\golang-go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=devel go1.23-0304d035cd Tue Apr 23 02:53:00 2024 +0000
set GODEBUG=
set GCCGO=gccgo
set GOAMD64=v1
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=C:\Users\qmuntaldiaz\code\gotest\go.mod
set GOWORK=
set CGO_CFLAGS=-O2 -g
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-O2 -g
set CGO_FFLAGS=-O2 -g
set CGO_LDFLAGS=-O2 -g
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=C:\Users\QMUNTA~1\AppData\Local\Temp\go-build402316087=/tmp/go-build -gno-record-gcc-switches

What did you do?

1. Build the following program:

package main

import (
	"runtime"
	"time"
)

func main() {
	runtime.Breakpoint()
	time.Sleep(10 * time.Minute)
}

2. Run it with WinDBG with the following command:

> g
> g KERNELBASE!GetQueuedCompletionStatusEx

What did you see happen?

The stack traces show some corrupted entries and a partial g0 stack:

What did you expect to see?

The stack traces should reach the main function and attribute the runtime.mcall to the userland time.Sleep call:

[gopherbot]

Change https://go.dev/cl/581335 mentions this issue: runtime: fix mcall unwinding on Windows