You have not done what Robert suggested. That is, "I would start by
publishing a small reproducible test case on github that fully compiles
that demonstrates the issue." It may not be practical to do so. However,
providing the source code for a small reproducible test case will make it
infinitely easier for others to a) reproduce the problem, and b)
investigate the problem and provide additional insights and possible fixes.
Note that option (a) will, itself, provide insights into the nature of the
problem if it only manifests on some, rather than all, platforms. You have
provided a lot of useful data but this type of problem really requires
others to be able to reproduce it. I say this as someone who was a level
three support engineer for two decades that specialized in solving exactly
this type of problem for the customers of the companies I worked for.
On Mon, Apr 3, 2023 at 8:16 PM mariappan balraj <mariappan.bal...@gmail.com>
wrote:
> Hi Robert,
>
> Eagerly waiting for your help. Some further update.
>
> I have set a break point at line number 332 by using dlv, noted the value
> of shced.sp. Once line number 332 is executed, reset the value of sched.sp
> by using set command in dlv. In this case, I am getting the proper trace.
>
> 326 func unwindm(restore *bool) {
> 327 if *restore {
> 328 // Restore sp saved by cgocallback during
> 329 // unwind of g's stack (see comment at top of file).
> 330 mp := acquirem()
> 331 sched := &mp.g0.sched
> 332 sched.sp = *(*uintptr)(unsafe.Pointer(sched.sp +
> alignUp(sys.MinFrameSize, sys.StackAlign)))
>
> Actual core file produces following stack trace:
>
> 0 0x0000000000460ec1 in runtime.raise
> at
> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/sys_linux_amd64.s:154
> 1 0x0000000000449865 in runtime.dieFromSignal
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/signal_unix.go:879
> 2 0x0000000000449e45 in runtime.sigfwdgo
> at
> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/signal_unix.go:1092
> 3 0x00000000004487c7 in runtime.sigtrampgo
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/signal_unix.go:432
> 4 0x0000000000461186 in runtime.sigtramp
> at
> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/sys_linux_amd64.s:352
> 5 0x00007f9ab9b5f520 in ???
> at ?:-1
> 6 0x0000000000449a78 in runtime.crash
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/signal_unix.go:971
> 7 0x0000000000434da5 in runtime.fatalpanic
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:1168
> 8 0x00000000004344ec in runtime.gopanic
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:987
> 9 0x00000000004642a7 in main.Test4
> at ./export.go:8
> 10 0x000000000046431c in _cgoexp_209e16473f08_Test4
> at _cgo_gotypes.go:61
> 11 0x000000000040535b in runtime.cgocallbackg1
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:315
> 12 0x0000000000405079 in runtime.cgocallbackg
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:234
> 13 0x0000000000461b0f in runtime.cgocallbackg
> at <autogenerated>:1
> 14 0x000000000045f3f4 in runtime.cgocallback
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:998
> 15 0x0000000000000001 in ???
> 15 0x0000000000000001 in ???
> at ?:-1
> 16 0x000000c00003e000 in ???
> at ?:-1
> error: error while reading spliced memory at 0x8: EOF
>
> <<< By using DLV and setting break point
>
> /root/go/bin/dlv exec ./test
> Type 'help' for list of commands.
> (dlv) break unwindm
> Breakpoint 1 set at 0x4054e6 for runtime.unwindm()
> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:326
> (dlv) c
> > runtime.unwindm()
> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:326 (hits
> goroutine(1):1 total:1) (PC: 0x4054e6)
> Warning: debugging optimized function
> 321: // Do not unwind m->g0->sched.sp.
> 322: // Our caller, cgocallback, will do that.
> 323: restore = false
> 324: }
> 325:
> => 326: func unwindm(restore *bool) {
> 327: if *restore {
> 328: // Restore sp saved by cgocallback during
> 329: // unwind of g's stack (see comment at top of
> file).
> 330: mp := acquirem()
> 331: sched := &mp.g0.sched
>
> (dlv)
> > runtime.unwindm()
> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:332 (PC:
> 0x40550d)
> Warning: debugging optimized function
> 327: if *restore {
> 328: // Restore sp saved by cgocallback during
> 329: // unwind of g's stack (see comment at top of
> file).
> 330: mp := acquirem()
> 331: sched := &mp.g0.sched
> => 332: sched.sp = *(*uintptr)(unsafe.Pointer(sched.sp +
> alignUp(sys.MinFrameSize, sys.StackAlign)))
> 333:
> 334: // Do the accounting that cgocall will not have a
> chance to do
> 335: // during an unwind.
> 336: //
> 337: // In the case where a Go call originates from C,
> ncgo is 0
>
> (dlv) p %x mp.g0.sched.sp
> 7fffab8268a8
>
> (dlv) n
> > runtime.unwindm()
> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:339 (PC:
> 0x405529)
> Warning: debugging optimized function
> 334: // Do the accounting that cgocall will not have a
> chance to do
> 335: // during an unwind.
> 336: //
> 337: // In the case where a Go call originates from C,
> ncgo is 0
> 338: // and there is no matching cgocall to end.
> => 339: if mp.ncgo > 0 {
> 340: mp.incgo = false
> 341: mp.ncgo--
> 342: osPreemptExtExit(mp)
> 343: }
> 344:
> (dlv) p %x mp.g0.sched.sp
> 7fffab826a18
>
> (dlv) set mp.g0.sched.sp=0x7fffab8268a8
> (dlv) p %x mp.g0.sched.sp
> 7fffab8268a8
>
> (dlv) break runtime.raise
> Breakpoint 2 set at 0x460ea0 for runtime.raise()
> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/sys_linux_amd64.s:144
>
> (dlv) c
> (dlv) c
>
> (dlv)
> > runtime.raise()
> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/sys_linux_amd64.s:153
> (PC: 0x460ebf)
> Warning: debugging optimized function
> 148: SYSCALL
> 149: MOVL AX, SI // arg 2 tid
> 150: MOVL R12, DI // arg 1 pid
> 151: MOVL sig+0(FP), DX // arg 3
> 152: MOVL $SYS_tgkill, AX
> => 153: SYSCALL
> 154: RET
>
> (dlv) bt
> 0 0x0000000000460ebf in runtime.raise
> at
> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/sys_linux_amd64.s:153
> 1 0x0000000000449865 in runtime.dieFromSignal
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/signal_unix.go:879
> 2 0x0000000000449a78 in runtime.crash
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/signal_unix.go:971
> 3 0x0000000000434da5 in runtime.fatalpanic
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:1168
> 4 0x00000000004344ec in runtime.gopanic
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:987
> 5 0x00000000004642a7 in main.Test4
> at ./export.go:8
> 6 0x000000000046431c in _cgoexp_209e16473f08_Test4
> at _cgo_gotypes.go:61
> 7 0x000000000040535b in runtime.cgocallbackg1
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:315
> 8 0x0000000000405079 in runtime.cgocallbackg
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:234
> 9 0x0000000000461b0f in runtime.cgocallbackg
> at <autogenerated>:1
> 10 0x000000000045f3f4 in runtime.cgocallback
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:998
> 11 0x00000000004641bd in crosscall2
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgo/asm_amd64.s:30
> 12 0x0000000000464386 in C.Test4
> at /tmp/go-build/_cgo_export.c:33
> 13 0x0000000000464432 in C.test1
> at ./hello.go:10
> 14 0x000000000046444d in C.test2
> at ./hello.go:15
> 15 0x0000000000464468 in C.test3
> 15 0x0000000000464468 in C.test3
> at ./hello.go:20
> 16 0x00000000004644a7 in C._cgo_209e16473f08_Cfunc_test3
> at /tmp/go-build/cgo-gcc-prolog:49
> 17 0x000000000045f2e4 in runtime.asmcgocall
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:848
> 18 0x000000000046448a in C._cgo_209e16473f08_Cfunc_test3
> at /tmp/go-build/cgo-gcc-prolog:44
> 19 0x0000000000404f0a in runtime.cgocall
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:167
> 20 0x0000000000464245 in main._Cfunc_test3
> at _cgo_gotypes.go:39
> 21 0x00000000004642d7 in main.main
> at ./hello.go:34
> 22 0x0000000000437073 in runtime.main
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/proc.go:250
> 23 0x000000000045f5e1 in runtime.goexit
> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:1598
>
> Stack trace looks fine till this point.
>
> Best Regards
> Mariappan
>
> On Mon, Apr 3, 2023 at 9:50 AM Robert Engels <reng...@ix.netcom.com>
> wrote:
>
>> I would start by publishing a small reproducible test case on github that
>> fully compiles that demonstrates the issue.
>>
>> On Apr 2, 2023, at 10:59 PM, mariappan balraj <mariappan.bal...@gmail.com>
>> wrote:
>>
>>
>> Hello Go Experts,
>>
>> It is good if someone can help on this?
>>
>> Best Regards
>> Mariappan
>> On Sat, Apr 1, 2023 at 7:45 AM mariappan balraj <
>> mariappan.bal...@gmail.com> wrote:
>>
>>> Hello Go experts,
>>>
>>> Could someone please help to resolve this issue?
>>>
>>> Best Regards
>>> Mariappan
>>>
>>> On Thu, Mar 30, 2023 at 2:52 PM mariappan balraj <
>>> mariappan.bal...@gmail.com> wrote:
>>>
>>>> Hello Go Experts,
>>>>
>>>> When panic() is called from Go function, in the below call sequence,
>>>> runtime.unwindm() [which is defer function of runtime.cgocallbackg1] is
>>>> called. This function is unwinding the system stack. Later, as part of the
>>>> function addOneOpenDeferFrame(), systemstack() is called to run a function
>>>> in the system stack. This will use the stack which is allocated for C
>>>> function calls. This makes stack unwinding impossible in case of panic() is
>>>> called. Can someone please help me to fix this issue?
>>>>
>>>> (dlv) bt
>>>> 0 0x00000000004054e6 in runtime.unwindm
>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:326
>>>> 1 0x0000000000405446 in runtime.cgocallbackg1.func3
>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:304
>>>> 2 0x00000000004340c8 in runtime.deferCallSave
>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:796
>>>> 3 0x0000000000433fa5 in runtime.runOpenDeferFrame
>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:769
>>>> 4 0x0000000000434332 in runtime.gopanic
>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:884
>>>> 5 0x00000000004642a7 in main.Test4
>>>> at ./export.go:7
>>>> at ./export.go:7
>>>> 6 0x000000000046431c in _cgoexp_78b81bbf688e_Test4
>>>> at _cgo_gotypes.go:61
>>>> 7 0x000000000040535b in runtime.cgocallbackg1
>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:315
>>>> 8 0x0000000000405079 in runtime.cgocallbackg
>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:234
>>>> 9 0x0000000000461b0f in runtime.cgocallbackg
>>>> at <autogenerated>:1
>>>> 10 0x000000000045f3f4 in runtime.cgocallback
>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:998
>>>> 11 0x00000000004641bd in crosscall2
>>>> at
>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgo/asm_amd64.s:30
>>>> 12 0x0000000000464386 in C.Test4
>>>> at /tmp/go-build/_cgo_export.c:33
>>>> 13 0x0000000000464432 in C.test1
>>>> at ./hello.go:9
>>>> 14 0x000000000046444d in C.test2
>>>> at ./hello.go:14
>>>> 15 0x0000000000464468 in C.test3
>>>> 15 0x0000000000464468 in C.test3
>>>> at ./hello.go:19
>>>> 16 0x00000000004644a7 in C._cgo_78b81bbf688e_Cfunc_test3
>>>> at /tmp/go-build/cgo-gcc-prolog:49
>>>> 17 0x000000000045f2e4 in runtime.asmcgocall
>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:848
>>>> 18 0x000000000046448a in C._cgo_78b81bbf688e_Cfunc_test3
>>>> at /tmp/go-build/cgo-gcc-prolog:44
>>>> 19 0x0000000000404f0a in runtime.cgocall
>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:167
>>>> 20 0x0000000000464245 in main._Cfunc_test3
>>>> at _cgo_gotypes.go:39
>>>> 21 0x00000000004642d7 in main.main
>>>> at ./hello.go:33
>>>> 22 0x0000000000437073 in runtime.main
>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/proc.go:250
>>>> 23 0x000000000045f5e1 in runtime.goexit
>>>> at
>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:1598
>>>>
>>>> 254 func cgocallbackg1(fn, frame unsafe.Pointer, ctxt uintptr) {
>>>> 304 defer unwindm(&restore)
>>>>
>>>> 326 func unwindm(restore *bool) {
>>>> 327 if *restore {
>>>> 328 // Restore sp saved by cgocallback during
>>>> 329 // unwind of g's stack (see comment at top of file).
>>>> 330 mp := acquirem()
>>>> 331 sched := &mp.g0.sched
>>>> 332 sched.sp = *(*uintptr)(unsafe.Pointer(sched.sp +
>>>> alignUp(sys.MinFrameSize, sys.StackAlign)))
>>>>
>>>> (dlv)
>>>> > runtime.addOneOpenDeferFrame()
>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:642 (PC:
>>>> 0x433a45)
>>>> Warning: debugging optimized function
>>>> 637: func addOneOpenDeferFrame(gp *g, pc uintptr, sp unsafe.Pointer)
>>>> {
>>>> 638: var prevDefer *_defer
>>>> 639: if sp == nil {
>>>> 640: prevDefer = gp._defer
>>>> 641: pc = prevDefer.framepc
>>>> => 642: sp = unsafe.Pointer(prevDefer.sp)
>>>> 643: }
>>>> 644: systemstack(func() {
>>>> 645: gentraceback(pc, uintptr(sp), 0, gp, 0, nil,
>>>> 0x7fffffff,
>>>> 646: func(frame *stkframe, unused
>>>> unsafe.Pointer) bool {
>>>> 647: if prevDefer != nil &&
>>>> prevDefer.sp == frame.sp {
>>>> (dlv) bt
>>>> 0 0x0000000000433a45 in runtime.addOneOpenDeferFrame
>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:642
>>>> 1 0x0000000000434357 in runtime.gopanic
>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:886
>>>> 2 0x00000000004642a7 in main.Test4
>>>> at ./export.go:7
>>>>
>>>> On Tue, Mar 28, 2023 at 4:14 PM mariappan balraj <
>>>> mariappan.bal...@gmail.com> wrote:
>>>>
>>>>> Hello Go Experts,
>>>>>
>>>>> I am observing system stack corruption when panic() is called from go
>>>>> function. When panic is called from Test4(), as part of
>>>>> runtime.systemstack_switch(), the RSP and RBP is set in such a way that it
>>>>> will corrupt the stack.
>>>>>
>>>>> Rbp = 0x00007ffdb188bd20===> This should be less than 0x7ffdb188bc50.
>>>>> But it is set to the value which is already used for CGO calls. So it is
>>>>> making the system stack to corrupt. When the core file is generated, it
>>>>> makes it unable to debug from the core file using dlv. Can someone please
>>>>> help on this issue?
>>>>>
>>>>> RBP 0x7ffdb188bc50 RA 0x45f3f4 runtime.cgocallback
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s 1003
>>>>> RBP 0x7ffdb188bca0 RA 0x4641bd crosscall2
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgo/asm_amd64.s 32
>>>>> RBP 0x7ffdb188bcd0 RA 0x464386 C.Test4 /tmp/go-build/_cgo_export.c 35
>>>>> RBP 0x7ffdb188bce0 RA 0x464432 C.test1
>>>>> /home/soomohan/mbalraj/test/hello.go 10
>>>>> RBP 0x7ffdb188bd00 RA 0x46444d C.test2
>>>>> /home/soomohan/mbalraj/test/hello.go 15
>>>>> RBP 0x7ffdb188bd20 RA 0x464468 C.test3
>>>>> /home/soomohan/mbalraj/test/hello.go 20
>>>>> RBP 0x7ffdb188bd50 RA 0x4644a7 C._cgo_78b81bbf688e_Cfunc_test3
>>>>> /tmp/go-build/cgo-gcc-prolog 51
>>>>>
>>>>> go version
>>>>> go version go1.20.2 linux/amd64
>>>>>
>>>>> //hello.go
>>>>> package main
>>>>>
>>>>> /*
>>>>> #include <stdio.h>
>>>>>
>>>>> extern void Test4(void);
>>>>>
>>>>> void test1(void) {
>>>>> Test4();
>>>>> }
>>>>>
>>>>> void test2(void) {
>>>>> int val = 2;
>>>>> test1();
>>>>> }
>>>>>
>>>>> void test3(void) {
>>>>> int val = 3;
>>>>> test2();
>>>>> }
>>>>>
>>>>> void test4(void) {
>>>>> printf("Test4()");
>>>>> }
>>>>> */
>>>>> import "C"
>>>>>
>>>>> func Test5() {
>>>>> C.test4()
>>>>> }
>>>>>
>>>>> func main() {
>>>>> C.test3()
>>>>> }
>>>>>
>>>>> //export.go
>>>>> package main
>>>>>
>>>>> import "C"
>>>>>
>>>>> //export Test4
>>>>> func Test4() {
>>>>> panic("Panic inside Test4")
>>>>> //Test5()
>>>>> }
>>>>>
>>>>> I have written the following script test.start to debug this issue
>>>>> further in DLV.
>>>>> def command_goroutine_start_line(args):
>>>>> regs = registers().Regs
>>>>> rip = 0
>>>>> for reg in regs:
>>>>> if reg.Name == "Rbp":
>>>>> rbp = int(reg.Value, 16)
>>>>> elif reg.Name == "Rip":
>>>>> rip = int(reg.Value, 16)
>>>>>
>>>>> da = disassemble(StartPC=rip, EndPC=rip+1).Disassemble
>>>>> print("RBP 0x%x RIP 0x%x %s %s %s" % (rbp, rip,
>>>>> da[0].Loc.Function.Name_, da[0].Loc.File, da[0].Loc.Line))
>>>>>
>>>>> while True:
>>>>> mem = examine_memory(rbp, 8).Mem
>>>>> val = 0
>>>>> for i in range(len(mem)):
>>>>> val <<= 8
>>>>> val += mem[len(mem) - i - 1]
>>>>> prbp = val
>>>>>
>>>>> mem = examine_memory(rbp + 8, 8).Mem
>>>>> val = 0
>>>>> for i in range(len(mem)):
>>>>> val <<= 8
>>>>> val += mem[len(mem) - i - 1]
>>>>> ra = val
>>>>>
>>>>> da = disassemble(StartPC=ra, EndPC=ra+1).Disassemble
>>>>> print("RBP 0x%x RA 0x%x %s %s %s" % (prbp, ra,
>>>>> da[0].Loc.Function.Name_, da[0].Loc.File, da[0].Loc.Line))
>>>>> if prbp == 0:
>>>>> break
>>>>> rbp = prbp
>>>>>
>>>>> def main():
>>>>> dlv_command("config alias goroutine_start_line gsl")
>>>>>
>>>>> (dlv)bt
>>>>> RBP 0x0 RA 0x45f5e1 runtime.goexit
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s 1599
>>>>>
>>>>> 0 0x0000000000433b04 in runtime.addOneOpenDeferFrame.func1
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:646
>>>>> 1 0x000000000045f0c0 in runtime.systemstack_switch
>>>>> at
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:463
>>>>> 2 0x0000000000433a89 in runtime.addOneOpenDeferFrame
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:644
>>>>> 3 0x0000000000434357 in runtime.gopanic
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:886
>>>>> 4 0x00000000004642a7 in main.Test4
>>>>> at ./export.go:7
>>>>> 5 0x000000000046431c in _cgoexp_78b81bbf688e_Test4
>>>>> at _cgo_gotypes.go:61
>>>>> 6 0x000000000040535b in runtime.cgocallbackg1
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:315
>>>>> 7 0x0000000000405079 in runtime.cgocallbackg
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:234
>>>>> 8 0x0000000000461b0f in runtime.cgocallbackg
>>>>> at <autogenerated>:1
>>>>> 9 0x000000000045f3f4 in runtime.cgocallback
>>>>> at
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:998
>>>>> 10 0x0000000000000001 in ???
>>>>> at ?:-1
>>>>> 11 0x0000000000464386 in C.Test4
>>>>> at /tmp/go-build/_cgo_export.c:33
>>>>> 12 0x0000000000464432 in C.test1
>>>>> at ./hello.go:9
>>>>> 13 0x000000000046444d in C.test2
>>>>> at ./hello.go:14
>>>>> 14 0x0000000000464468 in C.test3
>>>>> at ./hello.go:19
>>>>> 15 0x00000000004644a7 in C._cgo_78b81bbf688e_Cfunc_test3
>>>>> 15 0x00000000004644a7 in C._cgo_78b81bbf688e_Cfunc_test3
>>>>> at /tmp/go-build/cgo-gcc-prolog:49
>>>>> 16 0x000000000045f2e4 in runtime.asmcgocall
>>>>> at
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:848
>>>>> 17 0x000000000046448a in C._cgo_78b81bbf688e_Cfunc_test3
>>>>> at /tmp/go-build/cgo-gcc-prolog:44
>>>>> 18 0x0000000000404f0a in runtime.cgocall
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:167
>>>>> 19 0x0000000000464245 in main._Cfunc_test3
>>>>> at _cgo_gotypes.go:39
>>>>> 20 0x00000000004642d7 in main.main
>>>>> at ./hello.go:33
>>>>> 21 0x0000000000437073 in runtime.main
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/proc.go:250
>>>>> 22 0x000000000045f5e1 in runtime.goexit
>>>>> at
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:1598
>>>>>
>>>>> (dlv)source test.star
>>>>> (dlv)gsl
>>>>> (dlv) gsl
>>>>> RBP 0xc000048c68 RIP 0x433b04 runtime.addOneOpenDeferFrame.func1
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go 646
>>>>> RBP 0xc000048d28 RA 0x434357 runtime.gopanic
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go 905
>>>>> RBP 0xc000048d48 RA 0x4642a7 main.Test4
>>>>> /home/soomohan/mbalraj/test/export.go 7
>>>>> RBP 0xc000048d58 RA 0x46431c _cgoexp_78b81bbf688e_Test4
>>>>> _cgo_gotypes.go 62
>>>>> RBP 0xc000048e18 RA 0x40535b runtime.cgocallbackg1
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go 323
>>>>> RBP 0xc000048ea8 RA 0x405079 runtime.cgocallbackg
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go 240
>>>>> RBP 0xc000048ed0 RA 0x461b0f runtime.cgocallbackg <autogenerated> 1
>>>>> RBP 0x7ffdb188bc50 RA 0x45f3f4 runtime.cgocallback
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s 1003
>>>>> RBP 0x7ffdb188bca0 RA 0x4641bd crosscall2
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgo/asm_amd64.s 32
>>>>> RBP 0x7ffdb188bcd0 RA 0x464386 C.Test4 /tmp/go-build/_cgo_export.c 35
>>>>> RBP 0x7ffdb188bce0 RA 0x464432 C.test1
>>>>> /home/soomohan/mbalraj/test/hello.go 10
>>>>> RBP 0x7ffdb188bd00 RA 0x46444d C.test2
>>>>> /home/soomohan/mbalraj/test/hello.go 15
>>>>> RBP 0x7ffdb188bd20 RA 0x464468 C.test3
>>>>> /home/soomohan/mbalraj/test/hello.go 20
>>>>> RBP 0x7ffdb188bd50 RA 0x4644a7 C._cgo_78b81bbf688e_Cfunc_test3
>>>>> /tmp/go-build/cgo-gcc-prolog 51
>>>>> RBP 0xc000048f38 RA 0x45f2e4 runtime.asmcgocall
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s 852
>>>>> RBP 0xc000048f60 RA 0x464245 main._Cfunc_test3 _cgo_gotypes.go 40
>>>>> RBP 0xc000048f70 RA 0x4642d7 main.main
>>>>> /home/soomohan/mbalraj/test/hello.go 33
>>>>> RBP 0xc000048fd0 RA 0x437073 runtime.main
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/proc.go 260
>>>>> RBP 0x0 RA 0x45f5e1 runtime.goexit
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s 1599
>>>>>
>>>>> (dlv)si
>>>>>
>>>>> (dlv)bt
>>>>> 0 0x000000000045587f in runtime.gentraceback
>>>>> at
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/traceback.go:32
>>>>> 1 0x000000000045f0c0 in runtime.systemstack_switch
>>>>> at
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:463
>>>>> 2 0x0000000000433a89 in runtime.addOneOpenDeferFrame
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:644
>>>>> 3 0x0000000000434357 in runtime.gopanic
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:886
>>>>> 4 0x00000000004642a7 in main.Test4
>>>>> at ./export.go:7
>>>>> 5 0x000000000046431c in _cgoexp_78b81bbf688e_Test4
>>>>> at _cgo_gotypes.go:61
>>>>> 6 0x000000000040535b in runtime.cgocallbackg1
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:315
>>>>> 7 0x0000000000405079 in runtime.cgocallbackg
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:234
>>>>> 8 0x0000000000461b0f in runtime.cgocallbackg
>>>>> at <autogenerated>:1
>>>>> 9 0x000000000045f3f4 in runtime.cgocallback
>>>>> at
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:998
>>>>> 10 0x0000000000000001 in ???
>>>>> at ?:-1
>>>>> 11 0x0000000000464386 in C.Test4
>>>>> at /tmp/go-build/_cgo_export.c:33
>>>>> 12 0x0000000000464432 in C.test1
>>>>> at ./hello.go:9
>>>>> 13 0x000000000046444d in C.test2
>>>>> at ./hello.go:14
>>>>> 14 0x0000000000464468 in C.test3
>>>>> at ./hello.go:19
>>>>> 15 0x0000000000433b4b in runtime.addOneOpenDeferFrame.func1
>>>>> 15 0x0000000000433b4b in runtime.addOneOpenDeferFrame.func1
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/panic.go:645
>>>>> 16 0x000000000045f129 in runtime.systemstack
>>>>> at
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:496
>>>>> 17 0x0000000000461da5 in runtime.newproc
>>>>> at <autogenerated>:1
>>>>> 18 0x00000000004cc720 in ???
>>>>> at ?:-1
>>>>> 19 0x000000000046431c in _cgoexp_78b81bbf688e_Test4
>>>>> at _cgo_gotypes.go:61
>>>>> 20 0x000000000040535b in runtime.cgocallbackg1
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:315
>>>>> 21 0x0000000000405079 in runtime.cgocallbackg
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:234
>>>>> 22 0x0000000000461b0f in runtime.cgocallbackg
>>>>> at <autogenerated>:1
>>>>> 23 0x000000000045f3f4 in runtime.cgocallback
>>>>> at
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:998
>>>>> 24 0x000000000045f0c0 in runtime.systemstack_switch
>>>>> at
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:463
>>>>> 25 0x0000000000404f0a in runtime.cgocall
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/cgocall.go:167
>>>>> 26 0x0000000000464245 in main._Cfunc_test3
>>>>> at _cgo_gotypes.go:39
>>>>> 27 0x00000000004642d7 in main.main
>>>>> at ./hello.go:33
>>>>> 28 0x0000000000437073 in runtime.main
>>>>> at /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/proc.go:250
>>>>> 29 0x000000000045f5e1 in runtime.goexit
>>>>> at
>>>>> /home/soomohan/mbalraj/GO/go1.20.2/go/src/runtime/asm_amd64.s:1598
>>>>>
>>>>> (dlv) regs
>>>>> (dlv) regs
>>>>> Rip = 0x000000000045587f
>>>>> Rsp = 0x00007ffdb188ba08
>>>>> Rax = 0x000000000040535b
>>>>> Rbx = 0x000000c000048d68
>>>>> Rcx = 0x0000000000000000
>>>>> Rdx = 0x0000000000433b60
>>>>> Rsi = 0x0000000000000000
>>>>> Rdi = 0x000000c0000061a0
>>>>> Rbp = 0x00007ffdb188bd20
>>>>> R8 = 0x0000000000000000
>>>>> R9 = 0x000000007fffffff
>>>>> R10 = 0x00007ffdb188bd80
>>>>> R11 = 0x0000000000000000
>>>>> R12 = 0x00007ffdb188ba88
>>>>> R13 = 0x000000c000048c18
>>>>> R14 = 0x00000000004cc720
>>>>> R15 = 0x0000000000000000
>>>>> Rflags = 0x0000000000000246 [PF ZF IF IOPL=0]
>>>>> Es = 0x0000000000000000
>>>>> Cs = 0x0000000000000033
>>>>> Ss = 0x000000000000002b
>>>>> Ds = 0x0000000000000000
>>>>> Fs = 0x0000000000000000
>>>>> Gs = 0x0000000000000000
>>>>> Fs_base = 0x000015128ba66740
>>>>> Gs_base = 0x0000000000000000
>>>>>
>>>>> Best Regards
>>>>> Mariappan
>>>>>
>>>> --
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>> <https://groups.google.com/d/msgid/golang-nuts/CAKKWi6TOAChrRs64UBrNJSPFdFkYHhWiHPsDzu%2BMKPck9BOhVQ%40mail.gmail.com?utm_medium=email&utm_source=footer>
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>>
>> --
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--
Kurtis Rader
Caretaker of the exceptional canines Junior and Hank
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