go: runtime: "fatal error: unexpected signal" 0xC0000005 on Windows for a small program with a large allocation

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

$ go version
go version go1.14 windows/amd64

Does this issue reproduce with the latest release?

The tests were run with Go 1.14 on a fully patched Windows 10 Home Version 1909 (Build 18363.657).

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

$ go env
set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\Uli\AppData\Local\go-build
set GOENV=C:\Users\Uli\AppData\Roaming\go\env
set GOEXE=.exe
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\Uli\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=c:\go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=c:\go\pkg\tool\windows_amd64
set GCCGO=gccgo
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=C:\Users\Uli\src\lz\go.mod
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=C:\Users\Uli\AppData\Local\Temp\go-build893962726=/tmp/go-build -gno-record-gcc-switches
GOROOT/bin/go version: go version go1.14 windows/amd64
GOROOT/bin/go tool compile -V: compile version go1.14

What did you do?

I’m developing a package that creates Lempel-Ziv sequences for byte streams. On my usual development environment Ubuntu 18.04 I observe sometimes crashes of the test runs (fatal error: bad g->status in ready) for go1.13.8 and go1.14 on multiple kernels including 4.15.0 and 5.3.18. Both should not be affected by the AVX register corruption.

To exclude Linux as a factor I tested the package on Windows and got a fatal error on every run. I was able to reduce it to a small program. The program runs without any errors on Linux. Whether the Windows issue is related to the Linux problems I cannot tell. I’m aware that initializing a structure with a huge array this way is not a good idea, but that is what I wrote initially and what appears to trigger the stack extension that runs into an invalid address access.

I started the program with go run.

> go run main.go

package main

import "fmt"

type Sequencer struct {
        htable [1 << 17]uint32
        buf    []byte
}

func (s *Sequencer) Init(windowSize int) *Sequencer {
        if !(0 <= windowSize) {
                panic(fmt.Errorf("windowSize out of range [%d,%d]", 0, 0))
        }
        *s = Sequencer{
                buf: []byte{0xff},
        }

        return s
}

func main() {
        var s Sequencer
        s.Init(0)
}

https://play.golang.org/p/VRavJw-WPie

What did you expect to see?

No output and no fatal error.

What did you see instead?

fatal error: unexpected signal during runtime execution
[signal 0xc0000005 code=0x1 addr=0xc000134000 pc=0x4143a9]

runtime stack:
runtime.throw(0x4d5ec2, 0x2a)
        c:/go/src/runtime/panic.go:1112 +0x79
runtime.sigpanic()
        c:/go/src/runtime/signal_windows.go:240 +0x25a
runtime.runGCProg(0x4a294c, 0x0, 0xc000132000, 0x1, 0x579680)
        c:/go/src/runtime/mbitmap.go:1901 +0xd9
runtime.materializeGCProg(0x80008, 0x4a2948, 0x7bfc20)
        c:/go/src/runtime/mbitmap.go:1925 +0x93
runtime.adjustframe(0x7bfb30, 0x7bfc20, 0x579680)
        c:/go/src/runtime/stack.go:696 +0x272
runtime.gentraceback(0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xc00004a000, 0x0, 0x0, 0x7fffffff, 0x4d7720, 0x7bfc20, 0x0, ...)
        c:/go/src/runtime/traceback.go:334 +0x111c
runtime.copystack(0xc00004a000, 0x200000)
        c:/go/src/runtime/stack.go:888 +0x298
runtime.newstack()
        c:/go/src/runtime/stack.go:1043 +0x219
runtime.morestack()
        c:/go/src/runtime/asm_amd64.s:449 +0x97

goroutine 1 [copystack]:
main.(*Sequencer).Init(0xc0004dff60, 0x0, 0x0)
        C:/Users/Uli/src/lz/main.go:10 +0x1af fp=0xc0004dff48 sp=0xc0004dff40 pc=0x49f93f
main.main()
        C:/Users/Uli/src/lz/main.go:23 +0x76 fp=0xc00055ff88 sp=0xc0004dff48 pc=0x49f9c6
runtime.main()
        c:/go/src/runtime/proc.go:203 +0x212 fp=0xc00055ffe0 sp=0xc00055ff88 pc=0x434952
runtime.goexit()
        c:/go/src/runtime/asm_amd64.s:1373 +0x1 fp=0xc00055ffe8 sp=0xc00055ffe0 pc=0x45cd61
exit status 2