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cgo: segment fault when running proc address getting from LoadLibrary with 32bit mingw-w64 #42471

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zhuah opened this issue Nov 10, 2020 · 0 comments
Closed

cgo: segment fault when running proc address getting from LoadLibrary with 32bit mingw-w64 #42471

zhuah opened this issue Nov 10, 2020 · 0 comments
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@zhuah
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zhuah commented Nov 10, 2020

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

$ go version
go version go1.14.10 darwin/amd64

Does this issue reproduce with the latest release?

Yes.

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

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/zhuah/Library/Caches/go-build"
GOENV="/Users/zhuah/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/zhuah/go"
GOPRIVATE=""
GOPROXY="https://goproxy.cn,direct"
GOROOT="/usr/local/Cellar/go@1.14/1.14.10/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go@1.14/1.14.10/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/8n/mb3y_4bj1xv4q9sdmgjqdx_c0000gn/T/go-build145327919=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

I'm cross compiling a program on darwin to windows with mingw-w64 8.0, the program succeed when built as 64bit, but crashed when built as 32bit.

CGO_ENABLED=1 CC=i686-w64-mingw32-gcc GOOS=windows GOARCH=386 go build
package main

/*
#include <windows.h>
#include <stdio.h>

typedef BOOL (*IsRectEmptyProc)(RECT *rect);

void Test() {
	HANDLE lib = LoadLibraryA("user32.dll");
	IsRectEmptyProc proc = (IsRectEmptyProc)GetProcAddress(lib,"IsRectEmpty");
	printf("proc address: %d\n", proc);
	fflush(stdout);

	RECT rect = {0};
	BOOL res = proc(&rect);
	FreeLibrary(lib);

	printf("done\n");
	fflush(stdout);
}
*/
import "C"

func main() {
	C.Test()
}

What did you expect to see?

the program should works on both 32bit and 64bit.

What did you see instead?

it crashs on 32bit.

proc address: 1978786512
done
Exception 0xc0000005 0x8 0x1142afc4 0x1142afc4
PC=0x1142afc4

runtime: unknown pc 0x1142afc4
stack: frame={sp:0x7efe14, fp:0x0} stack=[0x0,0x7efe40)
007efd94:  00000000  00000000  00000000  00000000
007efda4:  00000000  00000000  00000000  00000000
007efdb4:  00000000  00000000  00000000  00000000
007efdc4:  00000000  00000000  00000000  00000000
007efdd4:  00000000  00000000  00000000  00000000
007efde4:  00000000  00000000  00000000  00000000
007efdf4:  00000000  00000000  00000000  1142afc4
007efe04:  004d6760  0000006c  0044ebae <runtime.asmcgocall+94>  1142afc4
007efe14: <0000006c  11424000  00000000  00000000
007efe24:  00000005  1142ae3c  0044d853 <runtime.systemstack+83>  0042ecd0 <runtime.mstart+0>
007efe34:  0044d742 <runtime.rt0_go+370>  00000000  0044d749 <runtime.rt0_go+377>
runtime: unknown pc 0x1142afc4
stack: frame={sp:0x7efe14, fp:0x0} stack=[0x0,0x7efe40)
007efd94:  00000000  00000000  00000000  00000000
007efda4:  00000000  00000000  00000000  00000000
007efdb4:  00000000  00000000  00000000  00000000
007efdc4:  00000000  00000000  00000000  00000000
007efdd4:  00000000  00000000  00000000  00000000
007efde4:  00000000  00000000  00000000  00000000
007efdf4:  00000000  00000000  00000000  1142afc4
007efe04:  004d6760  0000006c  0044ebae <runtime.asmcgocall+94>  1142afc4
007efe14: <0000006c  11424000  00000000  00000000
007efe24:  00000005  1142ae3c  0044d853 <runtime.systemstack+83>  0042ecd0 <runtime.mstart+0>
007efe34:  0044d742 <runtime.rt0_go+370>  00000000  0044d749 <runtime.rt0_go+377>

goroutine 1 [syscall]:
main._Cfunc_Test()
        _cgo_gotypes.go:41 +0x33
main.main()
        /Users/zhuah/Projects/playground/win32/main.go:26 +0x17
eax     0x0
ebx     0x4d6760
ecx     0xd491add
edx     0x0
edi     0x44ebae
esi     0x6c
ebp     0x4d6980
esp     0x7efe14
eip     0x1142afc4
eflags  0x10202
cs      0x23
fs      0x53
gs      0x2b
@zhuah zhuah closed this as completed Nov 10, 2020
@golang golang locked and limited conversation to collaborators Nov 10, 2021
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