Author Topic: Problem pausing debugger using TDM-GCC64, C::B v13.12  (Read 16054 times)

Offline glindsey

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Problem pausing debugger using TDM-GCC64, C::B v13.12
« on: May 01, 2014, 03:27:08 am »
Hey all:

I recently switched my toolchain from vanilla MinGW GCC 4.8 to TDM-GCC64 4.8.1, and since then, I've been unable to pause a running process in GDB using either the "pause" or "stop" buttons in Code::Blocks. If I set breakpoints before I start the program, GDB hits them with no trouble, and I can resume afterward. If I close the application normally, GDB exits like it should. It's only when I try to pause execution through Code::Blocks that nothing seems to happen.

Here's a debug log for the debugger:


Building to ensure sources are up-to-date
Selecting target:
Debug
Adding source dir: C:\GDrive\hobby\gamedev\projects\GamePlan\Template\
Adding source dir: C:\GDrive\hobby\gamedev\projects\GamePlan\
Adding file: C:\GDrive\hobby\gamedev\projects\GamePlan\Template\bin\Debug\TemplateProject.exe
Changing directory to: C:/GDrive/hobby/gamedev/projects/GamePlan/Template/.
Set variable: PATH=.;C:\GDrive\hobby\gamedev\libraries\SFML-2.1\build\lib;C:\GDrive\hobby\gamedev\libraries\boost_1_55_0\boost\stage\lib;C:\TDM-GCC-64\bin;C:\TDM-GCC-64;C:\Python27;C:\Python27\Scripts;C:\Perl64\site\bin;C:\Perl64\bin;c:\Program Files (x86)\Intel\iCLS Client;c:\Program Files\Intel\iCLS Client;C:\Windows\System32;C:\Windows;C:\Windows\System32\wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\OpenCL SDK\3.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\3.0\bin\x64;C:\Program Files (x86)\Windows Live\Shared;C:\Program Files\Intel\WiFi\bin;C:\Program Files\Common Files\Intel\WirelessCommon;C:\Program Files (x86)\CMake 2.8\bin;C:\Program Files\doxygen\bin;C:\Program Files\Microsoft SQL Server\110\Tools\Binn;c:\boost_1_55_0\build\bin;C:\Users\Gregory Lindsey\AppData\Roaming\Python\Scripts

[debug]Command-line: C:\TDM-GCC-64\bin\gdb.exe -nx -fullname  -quiet  -args C:/GDrive/hobby/gamedev/projects/GamePlan/Template/bin/Debug/TemplateProject.exe
[debug]Working dir : C:\GDrive\hobby\gamedev\projects\GamePlan\Template

Starting debugger: C:\TDM-GCC-64\bin\gdb.exe -nx -fullname  -quiet  -args C:/GDrive/hobby/gamedev/projects/GamePlan/Template/bin/Debug/TemplateProject.exe
done

[debug]> set prompt >>>>>>cb_gdb:

Registered new type: wxString
Registered new type: STL String
Registered new type: STL Vector
Setting breakpoints

[debug]Reading symbols from C:\GDrive\hobby\gamedev\projects\GamePlan\Template\bin\Debug\TemplateProject.exe...
[debug]done.
[debug](gdb) >>>>>>cb_gdb:
[debug]> show version
[debug]GNU gdb (GDB) 7.6.1
[debug]Copyright (C) 2013 Free Software Foundation, Inc.
[debug]License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
[debug]This is free software: you are free to change and redistribute it.
[debug]There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
[debug]and "show warranty" for details.
[debug]This GDB was configured as "x86_64-w64-mingw32".
[debug]For bug reporting instructions, please see:
[debug]<http://www.gnu.org/software/gdb/bugs/>.
[debug]>>>>>>cb_gdb:
[debug]> set confirm off

Debugger name and version: GNU gdb (GDB) 7.6.1

[debug]>>>>>>cb_gdb:
[debug]> set width 0
[debug]>>>>>>cb_gdb:
[debug]> set height 0
[debug]>>>>>>cb_gdb:
[debug]> set breakpoint pending on
[debug]>>>>>>cb_gdb:
[debug]> set print asm-demangle on
[debug]>>>>>>cb_gdb:
[debug]> set unwindonsignal on
[debug]>>>>>>cb_gdb:
[debug]> set print elements 0
[debug]>>>>>>cb_gdb:
[debug]> set new-console on
[debug]>>>>>>cb_gdb:
[debug]> set disassembly-flavor att
[debug]>>>>>>cb_gdb:
[debug]> catch throw
[debug]Catchpoint 1 (throw)
[debug]>>>>>>cb_gdb:
[debug]> source C:\Program Files (x86)\CodeBlocks\share\codeblocks/scripts/stl-views-1.0.3.gdb
[debug]>>>>>>cb_gdb:
[debug]> directory C:/GDrive/hobby/gamedev/projects/GamePlan/Template/
[debug]Source directories searched: C:/GDrive/hobby/gamedev/projects/GamePlan/Template;$cdir;$cwd
[debug]>>>>>>cb_gdb:
[debug]> directory C:/GDrive/hobby/gamedev/projects/GamePlan/
[debug]Source directories searched: C:/GDrive/hobby/gamedev/projects/GamePlan;C:/GDrive/hobby/gamedev/projects/GamePlan/Template;$cdir;$cwd
[debug]>>>>>>cb_gdb:
[debug]> run
[debug]Starting program: C:/GDrive/hobby/gamedev/projects/GamePlan/Template/bin/Debug/TemplateProject.exe

Child process PID: 3240

[debug][New Thread 3240.0x24fc]
[debug][New Thread 3240.0xd0c]
[debug][New Thread 3240.0x560c]
[debug][New Thread 3240.0x14e4]
[debug][New Thread 3240.0x23f8]
[debug][New Thread 3240.0x21b4]

Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...
Trying to pause the running process...



I should also note that Boost and SFML (the two libraries I am using) are also both compiled using TDM-GCC64, with SJLJ exception handling.

Any help you can give would be greatly appreciated!  Thanks!

GSL

Offline ollydbg

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Re: Problem pausing debugger using TDM-GCC64, C::B v13.12
« Reply #1 on: May 01, 2014, 05:48:57 am »
1, can you try to write a simple loop in a hello world like console app, and see the same issue
2, to developers:

I suspect we should use a 64 bit windows API to halt the debugee under 64 bit windows system? I don't have a 64 bit windows at hand.
Currently, we use

Code: [Select]
DebuggerGDB::DebuggerGDB() :
    cbDebuggerPlugin(wxT("GDB/CDB debugger"), wxT("gdb_debugger")),
    m_State(this),
    m_pProcess(0L),
    m_LastExitCode(0),
    m_Pid(0),
    m_PidToAttach(0),
    m_NoDebugInfo(false),
    m_StoppedOnSignal(false),
    m_pProject(0),
    m_stopDebuggerConsoleClosed(false),
    m_TemporaryBreak(false),
    m_printElements(0)
{
    if (!Manager::LoadResource(_T("debugger.zip")))
    {
        NotifyMissingFile(_T("debugger.zip"));
    }

    // get a function pointer to DebugBreakProcess under windows (XP+)
    #if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0501)
    kernelLib = LoadLibrary(TEXT("kernel32.dll"));
    if (kernelLib)
    {
        DebugBreakProcessFunc = (DebugBreakProcessApiCall)GetProcAddress(kernelLib, "DebugBreakProcess");
        //Windows XP
        CreateToolhelp32SnapshotFunc = (CreateToolhelp32SnapshotApiCall)GetProcAddress(kernelLib, "CreateToolhelp32Snapshot");
        Process32FirstFunc = (Process32FirstApiCall)GetProcAddress(kernelLib, "Process32First");
        Process32NextFunc = (Process32NextApiCall)GetProcAddress(kernelLib, "Process32Next");
    }
    #endif
}

I'm not sure what happens under a 64 bit windows system.
If some piece of memory should be reused, turn them to variables (or const variables).
If some piece of operations should be reused, turn them to functions.
If they happened together, then turn them to classes.

Offline oBFusCATed

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Re: Problem pausing debugger using TDM-GCC64, C::B v13.12
« Reply #2 on: May 01, 2014, 07:44:16 am »
@ollydbg: What 64bit API?
@glindsey:
Can you try the latest night build?
Do you have more than one line in initial commands edit box?
(most of the time I ignore long posts)
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Offline ollydbg

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Re: Problem pausing debugger using TDM-GCC64, C::B v13.12
« Reply #3 on: May 03, 2014, 02:56:00 pm »
@ollydbg: What 64bit API?
I guess/suspect that DebugBreakProcess from kernel32.dll can not break the debugee.
If some piece of memory should be reused, turn them to variables (or const variables).
If some piece of operations should be reused, turn them to functions.
If they happened together, then turn them to classes.

Offline glindsey

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Re: Problem pausing debugger using TDM-GCC64, C::B v13.12
« Reply #4 on: May 07, 2014, 03:22:47 am »
Thanks for the help!

I tried making a simple console app as you requested. The code is below:


#include <iostream>
#include <chrono>
#include <thread>

int main()
{
  unsigned int x;
  std::cout << "Hello world!" << std::endl;
  while(1)
  {
    std::cout << x << "... Pausing for a second..." << std::endl;
    std::this_thread::sleep_for(std::chrono::seconds(1));
    ++x;
  }

  return 0;
}


Once again, the pause/stop debugger buttons don't work; the only way to stop the program is to close it via its own close box, or kill it with Task Manager.

I haven't tried the latest nightly build yet; I'll see if I can get to it this weekend. (I only get to work on my own projects when I'm not developing at work!  :) )

Offline ollydbg

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« Last Edit: May 07, 2014, 07:16:16 am by ollydbg »
If some piece of memory should be reused, turn them to variables (or const variables).
If some piece of operations should be reused, turn them to functions.
If they happened together, then turn them to classes.

Offline glindsey

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Re: Problem pausing debugger using TDM-GCC64, C::B v13.12
« Reply #6 on: May 10, 2014, 04:33:46 am »
Interesting -- thanks for looking into the problem. For the time being I can work fine setting breakpoints before running the program; heck, it's better than what I have at work, where I usually don't have a debugger and have to trace code execution with cout statements!

Since I assume porting C::B to 64 bits is a pretty big project, maybe in the meantime the existing app could call some sort of small 64-bit "shim" app which could pause the running process? I'm just shooting in the dark here...

Offline oBFusCATed

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Re: Problem pausing debugger using TDM-GCC64, C::B v13.12
« Reply #7 on: May 10, 2014, 09:36:00 am »
What an unpleasant situation. :(
The second executable seems like the only choice, but this requires some work and lots of testing.
I have no time to do it so patches are welcome! I'll try to review and push them with priority!

C::B is buildable in 64bit mode, but I'm not sure how well does it work on windows.
(most of the time I ignore long posts)
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Offline Vuki

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Re: Problem pausing debugger using TDM-GCC64, C::B v13.12
« Reply #8 on: May 10, 2014, 01:58:01 pm »
I've compiled SVN 9744 in 64 bit mode with TDM 4.8.1-3. Pausing the debugger works - sort of. It does not return control to the program, so you can pause the process, but you cannot resume it or debug code.

Code: [Select]
Trying to interrupt process with pid: 2432; child pid: 2432 gdb pid: 3560
Program received signal SIGTRAP, Trace/breakpoint trap.
In ?? () ()

Offline oBFusCATed

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Re: Problem pausing debugger using TDM-GCC64, C::B v13.12
« Reply #9 on: May 10, 2014, 08:47:29 pm »
Can you post the full log from the debugger?
(most of the time I ignore long posts)
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Offline Vuki

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Re: Problem pausing debugger using TDM-GCC64, C::B v13.12
« Reply #10 on: May 11, 2014, 07:32:23 pm »
I used glindsey's code from this topic. After pausing the debugger, this is all I get from the debugger log:

Code: [Select]

Trying to interrupt process with pid: 448; child pid: 448 gdb pid: 2068

[debug][New Thread 448.0x73c]
[debug]Program received signal SIGTRAP, Trace/breakpoint trap.
[debug][Switching to Thread 448.0x73c]
[debug]0x00007ffe8932c6b1 in ?? ()
[debug]>>>>>>cb_gdb:

Program received signal SIGTRAP, Trace/breakpoint trap.
In ?? () ()

[debug]> bt 30
[debug]#0  0x00007ffe8932c6b1 in ?? ()
[debug]#1  0x00007ffe8935b964 in ?? ()
[debug]#2  0x0000000000000000 in ?? ()
[debug]>>>>>>cb_gdb:

At this moment, I can resume the program and it runs. I can set a breakpoint in the code and it stops there. But I can't get to the program code in which the program is at the moment of pausing (the loop in this example). As you see, the program is not even in the stack trace. If I try to do a Step out anyway, I get:
Code: [Select]
[debug]> finish
[debug]Run till exit from #0  0x00007ffe8932c6b1 in ?? ()
[debug]0x00007ffe8935b964 in ?? ()
[debug]>>>>>>cb_gdb:

In ?? () ()

[debug]> bt 30
[debug]#0  0x00007ffe8935b964 in ?? ()
[debug]#1  0x0000000000000000 in ?? ()
[debug]>>>>>>cb_gdb:

And the next attempt to Step out:
Code: [Select]
[debug]> finish
[debug]Warning:
[debug]Cannot insert breakpoint 0.
[debug]Error accessing memory address 0x0: Input/output error.
[debug]Run till exit from #0  0x00007ffe8935b964 in ?? ()
[debug]>>>>>>cb_gdb:

Error accessing memory address 0x0: Input/output error.

[debug]> info frame
[debug]Stack level 0, frame at 0xb2ff38:
[debug] rip = 0x7ffe8935b964; saved rip 0x0
[debug] called by frame at 0xb2ff40
[debug] Arglist at 0xb2ff28, args:
[debug] Locals at 0xb2ff28, Previous frame's sp is 0xb2ff38
[debug] Saved registers:
[debug]  rip at 0xb2ff30
[debug]>>>>>>cb_gdb:

In  ()

[debug]> bt 30
[debug]#0  0x00007ffe8935b964 in ?? ()
[debug]#1  0x0000000000000000 in ?? ()

Offline oBFusCATed

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Re: Problem pausing debugger using TDM-GCC64, C::B v13.12
« Reply #11 on: May 12, 2014, 12:56:31 am »
1. Do you have debug info enabled?
2. Does it work if you use the same gdb executable from the command line?
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Offline Vuki

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Re: Problem pausing debugger using TDM-GCC64, C::B v13.12
« Reply #12 on: May 12, 2014, 11:33:06 am »
1. Yes, I can debug the program in normal mode.
2. The only way I know is to press CTRL+C in command line debugger. And it stops in KERNEL32!CtrlRoutine, there is no way to return to the code. I thought that this "DebugBreakProcess" method is smarter than this.

Offline oBFusCATed

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Re: Problem pausing debugger using TDM-GCC64, C::B v13.12
« Reply #13 on: May 12, 2014, 08:57:53 pm »
Does the continue gdb command work?
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Offline Vuki

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Re: Problem pausing debugger using TDM-GCC64, C::B v13.12
« Reply #14 on: May 13, 2014, 08:10:36 am »
Yes, it works.