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runtime: callback memory error #61147

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mainjzb opened this issue Jul 3, 2023 · 5 comments
Closed

runtime: callback memory error #61147

mainjzb opened this issue Jul 3, 2023 · 5 comments
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compiler/runtime Issues related to the Go compiler and/or runtime. OS-Windows

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@mainjzb
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mainjzb commented Jul 3, 2023

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

$ go version
go version go1.20.5 windows/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
set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\mainj\AppData\Local\go-build
set GOENV=C:\Users\mainj\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\mainj\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\mainj\go
set GOPRIVATE=
set GOPROXY=https://goproxy.cn,direct
set GOROOT=C:\Program Files\Go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=C:\Program Files\Go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.20.5
set GCCGO=gccgo
set GOAMD64=v1
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=NUL
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 -fdebug-prefix-map=C:\Users\mainj\AppData\Local\Temp\go-build1190511740=/tmp/go-build -gno-record-gcc-switches

What did you do?

I want call C++ dll that has C API , the one API has callback function as parameter.
when I alloc memory in callback funtion , my go program will exit.

func MyCallBack() uintptr {
	b := make([]byte, 1024*1024)
	_ = b

	printMemUsage()
	return 0
}

func printMemUsage() {
	var m runtime.MemStats
	runtime.ReadMemStats(&m)
	fmt.Printf("Alloc = %v MiB\n", m.Alloc/1024/1024)
}
func main(){
    dll := MustLoadDLL("xx.dll")
    t := syscall.NewCallback(MyCallBack)
    cFunc = nfapi.MustFindProc("cFunc")

    type EH struct {
        callback uintptr
    }
    eh := EH{t}

    cFunc.Call(uintptr(unsafe.Pointer(&_eh)))
}

What did you expect to see?

The program should not exit.

What did you see instead?

the output :

Alloc = 1 MiB
Alloc = 2 MiB
Alloc = 3 MiB
Alloc = 4 MiB
Alloc = 1 MiB
Alloc = 2 MiB
Alloc = 3 MiB
Alloc = 4 MiB
Alloc = 1 MiB
Alloc = 2 MiB
Alloc = 3 MiB
Alloc = 4 MiB

exit status 0xc0000005

I see the Task Manager the process memroy increate to 8MB , process will exit in any way .

@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Jul 3, 2023
@mainjzb mainjzb changed the title runtime: callback memory error runtime: 1.20.5 callback memory error Jul 3, 2023
@ianlancetaylor
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Can you show us a complete standalone program that demonstrates the problem?

@mainjzb
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mainjzb commented Jul 3, 2023

https://github.com/mainjzb/go1.20.5_error
I upload my mini case.

@mainjzb mainjzb changed the title runtime: 1.20.5 callback memory error runtime: callback memory error Jul 4, 2023
@mainjzb
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mainjzb commented Jul 4, 2023

#59724 Perhaps it's a related issue
I try these go version all will exit with 0xc0000005
1.18.10
1.19.10
1.20.5

It's seem about GC break stack and heap
The larger the created memory, the faster it crashes

@mainjzb
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mainjzb commented Jul 6, 2023

debug.SetGCPercent(-1)
I add the code in func main to stop gc, It's will work fine.

@mainjzb
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mainjzb commented Jul 6, 2023

I finally discovered the problem. The problem was that nf_EventHandler no escape . When the garbage collection (GC) occurred, it was being collected by the GC. Therefore, I redeclared a global variable, and the problem was resolved.

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Labels
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