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From: "mariappan.balraj at gmail dot com"
 <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug go/30038] New: When using CGO and C code is calling GO
 function, not getting call stack of C from core dump. Only getting call stack
 of GO.
Date: Tue, 24 Jan 2023 06:54:25 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gdb
X-Bugzilla-Component: go
X-Bugzilla-Version: 12.1
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: critical
X-Bugzilla-Who: mariappan.balraj at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30038

            Bug ID: 30038
           Summary: When using CGO and C code is calling GO function, not
                    getting call stack of C from core dump. Only getting
                    call stack of GO.
           Product: gdb
           Version: 12.1
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: go
          Assignee: unassigned at sourceware dot org
          Reporter: mariappan.balraj at gmail dot com
  Target Milestone: ---

Following is the source code:

//test.go
package main

/*
#include <stdio.h>

extern void Test4(void);

void test1(void) {
   Test4();
}

void test2(void) {
    int val =3D 2;
    test1();
}

void test3(void) {
    int val =3D 3;
    test2();
}
*/
import "C"

func main() {
    C.test3()
}

//export.go
import "C"

//export Test4
func Test4() {
    panic("Panic inside Test4")
}

Process crashed because of PANIC from Test4().
test3() is called from GO code. test3() is calling test2() and which is cal=
ling
test1() and which is calling Test4() Go function. Not seeing test3(), test2=
()
and test1() in the back trace of core dump. This is very important for
debugging when CGO is used.=20

#gdb ./test core.242083
//Back trace
(gdb) bt
#0  runtime.raise () at /usr/local/go/src/runtime/sys_linux_amd64.s:159
#1  0x0000000000443385 in runtime.dieFromSignal (sig=3D6) at
/usr/local/go/src/runtime/signal_unix.go:871
#2  0x000000000044391e in runtime.sigfwdgo (sig=3D6, info=3D<optimized out>,
ctx=3D<optimized out>, ~r0=3D<optimized out>) at
/usr/local/go/src/runtime/signal_unix.go:1087
#3  0x0000000000442027 in runtime.sigtrampgo (sig=3D0, info=3D0x0, ctx=3D0x=
458401
<runtime.raise+33>) at /usr/local/go/src/runtime/signal_unix.go:432
#4  0x00000000004586e6 in runtime.sigtramp () at
/usr/local/go/src/runtime/sys_linux_amd64.s:359
#5  <signal handler called>
#6  runtime.raise () at /usr/local/go/src/runtime/sys_linux_amd64.s:159
#7  0x0000000000443385 in runtime.dieFromSignal (sig=3D6) at
/usr/local/go/src/runtime/signal_unix.go:871
#8  0x000000000042f9a9 in runtime.crash () at
/usr/local/go/src/runtime/signal_unix.go:963
#9  runtime.fatalpanic (msgs=3D<optimized out>) at
/usr/local/go/src/runtime/panic.go:1170
#10 0x000000000042f07a in runtime.gopanic (e=3D...) at
/usr/local/go/src/runtime/panic.go:987
#11 0x000000000045ac07 in main.Test4 () at
/home/ubuntu/mbalraj/GO/TEST/TEST4/export.go:7
#12 _cgoexp_040b784f82f8_Test4 (a=3D<optimized out>) at _cgo_gotypes.go:51
#13 0x0000000000404a82 in runtime.cgocallbackg1 (fn=3D0x45abe0
<_cgoexp_040b784f82f8_Test4>, frame=3D0x7fff8d239d27, ctxt=3D0) at
/usr/local/go/src/runtime/cgocall.go:316
#14 0x0000000000404709 in runtime.cgocallbackg (fn=3D0x45abe0
<_cgoexp_040b784f82f8_Test4>, frame=3D0x7fff8d239d27, ctxt=3D0) at
/usr/local/go/src/runtime/cgocall.go:235
#15 0x0000000000458d8f in runtime.cgocallbackg (fn=3D0x45abe0
<_cgoexp_040b784f82f8_Test4>, frame=3D0x7fff8d239d27, ctxt=3D0) at
<autogenerated>:1
#16 0x0000000000456934 in runtime.cgocallback () at
/usr/local/go/src/runtime/asm_amd64.s:994
#17 0x0000000000456600 in ?? ()
#18 0x0000000000404585 in runtime.cgocall (fn=3D0x45acb0
<_cgo_040b784f82f8_Cfunc_test3>, arg=3D0xc000058f70, ~r0=3D<optimized out>)=
 at
/usr/local/go/src/runtime/cgocall.go:168
#19 0x000000000045ab85 in main._Cfunc_test3 (r1=3D...) at _cgo_gotypes.go:41
#20 0x000000000045abb7 in main.main () at
/home/ubuntu/mbalraj/GO/TEST/TEST4/test.go:25

--=20
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