runtime: Android shared lib panic

[gooid]

Please answer these questions before submitting your issue. Thanks!

1. What version of Go are you using (go version)?
   go version devel +0e392c6 Thu May 26 09:27:08 2016 +0800 windows/amd64
2. What operating system and processor architecture are you using (go env)?
   set GOARCH=arm
   set GOARM=7
   set GOOS=android
   set CGO_ENABLED=1
3. What did you do?
   If possible, provide a recipe for reproducing the error.
   A complete runnable program is good.
   A link on play.golang.org is best.

armstack.go

package main

/*
typedef struct {
    int x,y,z;
    int a,b,c,d,e,f,g,h,i,j,k;
    } S1;

typedef struct {
    int a,b,c;
    S1  x,y,z[30];
    } S2;

extern void cgoCallback(S1* s1,S2* s2,int cnt);
*/
import "C"

import (
    "log"
)

type S1 C.S1
type S2 C.S2

//export cgoCallback
func cgoCallback(s1 *S1, s2 *S2, cnt C.int) {
    cnt++

    log.Println("cgoCallback1:", int(cnt), s1, s2)

    if cnt < 500 {
        s1 := &S1{}
        s2 := &S2{}
        cgoCallback(s1, s2, cnt)
    }
}

func main() {
    log.Println(".")
}

main.c

#include <stdio.h>
#include <stdlib.h>
#include "libarmstack.h"

int main(int argc, char** argv) {
    S1 o1 = {0};
    S2 o2 = {0};
    S1* s1= &o1;
    S2* s2= &o2;

    cgoCallback(s1,s2,0);

    cgoCallback(s1,s2,0);   

    //cgoCallback(s1,s2,0); 
    return 0;
}

go build -buildmode c-shared -o libarmstack.so armstack.go
gcc -marm main.c -o armstack -L. -larmstack
push to android 4.4 phone, then run.

result:

runtime: unexpected return pc for runtime.cgocallback_gofunc called from 0x0
fatal error: unknown caller pc

runtime stack:
runtime.throw(0xb6e97b9e, 0x11)
        D:/GoLang/goSource/go/src/runtime/panic.go:566 +0x80
runtime.gentraceback(0xb6e29ebc, 0x96dd43bc, 0x0, 0x96c143c0, 0x0, 0x0, 0x7fffffff, 0x868b5d04, 0x0, 0x0, ...)
        D:/GoLang/goSource/go/src/runtime/traceback.go:317 +0x1620
runtime.scanstack(0x96c143c0, 0x96c2292c)
        D:/GoLang/goSource/go/src/runtime/mgcmark.go:770 +0x344
runtime.scang(0x96c143c0, 0x96c2292c)
        D:/GoLang/goSource/go/src/runtime/proc.go:830 +0xb0
runtime.markroot.func1()
        D:/GoLang/goSource/go/src/runtime/mgcmark.go:234 +0xac
runtime.systemstack(0x96c22000)
        D:/GoLang/goSource/go/src/runtime/asm_arm.s:247 +0x8c
runtime.mstart()
        D:/GoLang/goSource/go/src/runtime/proc.go:1081

---

However, if you only once cgoCallback(s1,s2,0) is not panic.

[eliasnaur]

I'm also bitten by this in a gomobile project. Git bisect points to:

5f9a870bf1bf461ca3609502608b12cc4aab189a is the first bad commit
commit 5f9a870bf1bf461ca3609502608b12cc4aab189a
Author: Ian Lance Taylor <iant@golang.org>
Date:   Wed Apr 27 14:18:29 2016 -0700

    cmd/cgo, runtime, runtime/cgo: use cgo context function

(CL 22508). I tried to blindly apply the similar CL 22651 (for arm64), but failed.

CC @ianlancetaylor

I believe this is Go1.7 material, if not Go1.7Beta.

[ianlancetaylor]

Sorry for the difficulties. Can you try https://golang.org/cl/23586 ?

[gopherbot]

CL https://golang.org/cl/23586 mentions this issue.