Hi Kurtis Rader,
Thanks for your response. I am working on it. I will quickly share it.
Before that one more update. I have commented the below two lines. Now from
the core, I am able to see the correct stack 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.sched332 //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
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
345 releasem(mp)
346 }
347 }
(dlv)bt
0 0x0000000000460ea1 in runtime.raise
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/sys_linux_amd64.s:154
1 0x0000000000449845 in runtime.dieFromSignal
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/signal_unix.go:879
2 0x0000000000449e25 in runtime.sigfwdgo
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/signal_unix.go:1092
3 0x00000000004487a7 in runtime.sigtrampgo
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/signal_unix.go:432
4 0x0000000000461186 in runtime.sigtramp
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/sys_linux_amd64.s:354
5 0x00007f2d5ba16520 in ???
at ?:-1
6 0x0000000000449a58 in runtime.crash
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/signal_unix.go:971
7 0x0000000000434d85 in runtime.fatalpanic
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/panic.go:1168
8 0x00000000004344cc in runtime.gopanic
at /home/soomohan/mbalraj/GO/go1202/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/go1202/go/src/runtime/cgocall.go:315
12 0x0000000000405079 in runtime.cgocallbackg
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/cgocall.go:234
13 0x0000000000461b0f in runtime.cgocallbackg
at <autogenerated>:1
14 0x000000000045f3d4 in runtime.cgocallback
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/asm_amd64.s:998
15 0x00000000004641bd in crosscall2
15 0x00000000004641bd in crosscall2
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/cgo/asm_amd64.s:30
16 0x0000000000464386 in C.Test4
at /tmp/go-build/_cgo_export.c:33
17 0x0000000000464432 in C.test1
at ./hello.go:10
18 0x000000000046444d in C.test2
at ./hello.go:15
19 0x0000000000464468 in C.test3
at ./hello.go:20
20 0x00000000004644a7 in C._cgo_209e16473f08_Cfunc_test3
at /tmp/go-build/cgo-gcc-prolog:49
21 0x000000000045f2c4 in runtime.asmcgocall
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/asm_amd64.s:848
22 0x000000000046448a in C._cgo_209e16473f08_Cfunc_test3
at /tmp/go-build/cgo-gcc-prolog:44
23 0x0000000000404f0a in runtime.cgocall
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/cgocall.go:167
24 0x0000000000464245 in main._Cfunc_test3
at _cgo_gotypes.go:39
25 0x00000000004642d7 in main.main
at ./hello.go:34
26 0x0000000000437053 in runtime.main
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/proc.go:250
27 0x000000000045f5c1 in runtime.goexit
at /home/soomohan/mbalraj/GO/go1202/go/src/runtime/asm_amd64.s:1598
Best Regards
Mariappan
On Tue, Apr 4, 2023 at 9:02 AM Kurtis Rader <kra...@skepticism.us> wrote:
> 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
>>>>>>
>>>>> --
>>> You received this message because you are subscribed to the Google
>>> Groups "golang-nuts" group.
>>> To unsubscribe from this group and stop receiving emails from it, send
>>> an email to golang-nuts+unsubscr...@googlegroups.com.
>>> To view this discussion on the web visit
>>> https://groups.google.com/d/msgid/golang-nuts/CAKKWi6TOAChrRs64UBrNJSPFdFkYHhWiHPsDzu%2BMKPck9BOhVQ%40mail.gmail.com
>>> <https://groups.google.com/d/msgid/golang-nuts/CAKKWi6TOAChrRs64UBrNJSPFdFkYHhWiHPsDzu%2BMKPck9BOhVQ%40mail.gmail.com?utm_medium=email&utm_source=footer>
>>> .
>>>
>>> --
>> You received this message because you are subscribed to the Google Groups
>> "golang-nuts" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to golang-nuts+unsubscr...@googlegroups.com.
>> To view this discussion on the web visit
>> https://groups.google.com/d/msgid/golang-nuts/CAKKWi6Souf4Cj%3Dcbh6A3mf2MwZGUF_h6rLu3rEqVJZuXOQg-Ow%40mail.gmail.com
>> <https://groups.google.com/d/msgid/golang-nuts/CAKKWi6Souf4Cj%3Dcbh6A3mf2MwZGUF_h6rLu3rEqVJZuXOQg-Ow%40mail.gmail.com?utm_medium=email&utm_source=footer>
>> .
>>
>
>
> --
> Kurtis Rader
> Caretaker of the exceptional canines Junior and Hank
>
--
You received this message because you are subscribed to the Google Groups
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to golang-nuts+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/golang-nuts/CAKKWi6TROvOpf9LyHBfbD8HJxPgWm7aR7KEQ7xv%2BNp8-2KtQvg%40mail.gmail.com.
