View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0011950 | Lazarus | Debugger | public | 2008-08-23 15:21 | 2010-05-22 14:11 |
| Reporter | Vladimir Zhirov | Assigned To | Marc Weustink | ||
| Priority | normal | Severity | major | Reproducibility | always |
| Status | closed | Resolution | no change required | ||
| Product Version | 0.9.25 (SVN) | ||||
| Target Version | 1.0.0 | ||||
| Summary | 0011950: SIGSEGV when debugging non-LCL applications | ||||
| Description | If I debug LCL application created with "File -> New -> Application", everything works as expected. However when I try to debug non-LCL application (e.g. console application, custom application or fpGUI one), the debugger works every second try and I get two error message boxes when I start debugging: 1) "Project raised exception class 'External: SIGSEGV'." 2) "Execution paused Adress: $7C918FEA" Procedure: ntdll!RtlpWaitForCriticalSection File: (Some day an assembler window might popup here :)" Exception address and procedure stay the same for all non-LCL projects I tried to debug. The whole process looks like this: - Run (F9) - Error message 0000001, pressing "OK" - Error message 0000002, pressing "OK" - Application console appears, the output is empty - Application hangs - Stop (Ctrl-F2) - Run (F9) - Error message 0000001, pressing "OK" - Error message 0000002, pressing "OK" - Application console appears - The output appears in console, or fpGUI window appears on the screen - Application is running, and debugger is working as expected until the application is terminated. Then I have to start from the beginning to get the debugger working. Some background info: * Windows XP. * Lazarus 0.9.25 r16153. I was able to reproduce it a month ago too, I cannot remember the revision number though. * I have -g and -gl options enabled in "Project -> Compiler Options -> Linking". -XX, -CX and -Xs options are disabled. * fpc 2.2.2 (shipped with Lazarus). * gdb 6.7.50.20071127 (shipped with Lazarus). * Path to gdb contains no spaces or non-ASCII characters. | ||||
| Tags | No tags attached. | ||||
| Fixed in Revision | |||||
| LazTarget | 1.0 | ||||
| Widgetset | Win32/Win64 | ||||
| Attached Files |
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| related to | 0017089 | closed | Martin Friebe | Can not debug a non-LCL application without including unit Interfaces |
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Possible workaround is to include LCL as a dependency for any project (even non-LCL one) and put 'Interfaces' unit in program uses clause. |
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Can you test with snapshots of 11 November and later, which contain gdb version 6.8-3? |
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Yes, I will test. Should I test with 0.9.27 snapshot, or 0.9.26.1 fixes contain new version of gdb too? |
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Both should have it. |
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The problem persists with new gdb. The behavior is exactly the same. |
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Please retest once again with more recent 0.9.27 version. I cannot reproduce it. Maybe it somehow related to few debugger issues we already fixed after your last note. |
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Tested, the problem is still here. |
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Then maybe you will attach your application wich cause the problem? |
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I can reproduce it with a simple "hello world" console program: program project1; {$mode objfpc}{$H+} uses Classes, SysUtils; begin Writeln('Hello World'); end. |
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and where is {$apptype console} ? |
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According to page 32 of FPC programmers manual (prog.pdf) CONSOLE is the default application type, there is no need to set it explicitly. I've just noticed though the behavior has changed, I'm sorry for not mentioning it earlier. If the debugger is enabled programs without dependency on LCL does not work at all now, even on the second try. They always hang after showing 'External: SIGSEGV' message and assembler window. So the example application never shows 'Hello world' if run in the debugging mode. LCL-dependant programs that have interfaces.pp in their uses clause work as expected. |
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I cannot reproduce any problem. Try to update your fpc to recent 2.3.1 and check with it. But really I dont know where and how to search for that problem. |
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Well, this problem is not critical for me because of the workaround mentioned in the first note. Switching to fpc 2.3.1 is not desirable for me at the moment because of the existing projects I must keep stable. It is OK for me if the problem could be only solved by new fpc or dgb release. Maybe we should change the severity of this issue to minor or even close it. |
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And what gdb version do you use? Can you test with gdb 6.8? Can you run your program under gdb without IDE? |
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I cannot reproduce this with my lazarus executable compiled on 8-3-2009 and fpc 2.2.2. |
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@Paul GNU gdb 6.8 Copyright (C) 2008 Free Software Foundation, Inc. <skipped> This GDB was configured as "i686-pc-mingw32"... (gdb) start Breakpoint 1 at 0x4014ae: file project1.pas, line 10. Starting program: D:\work\exp\testdbg/project1.exe [New thread 1836.0x4ec] Program received signal SIGSEGV, Segmentation fault. 0x7c918fea in ntdll!RtlpWaitForCriticalSection () from C:\WINDOWS\system32\ntdll.dll (gdb) step Single stepping until exit from function ntdll!RtlpWaitForCriticalSection, which has no line number information. 0x7c90eaf0 in ntdll!LdrDisableThreadCalloutsForDll () from C:\WINDOWS\system32\ntdll.dll The same program compiled with LCL dependency works as expected both in Lazarus and when debugging via the command-line gdb. @Vincent If both Paul and you cannot reproduce it, maybe it is hardware related problem. I think the CPU is the first thing to check, I tested it on Intel Pentium 4 Willamette 1500 MHz Stepping D0. |
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The problem seems to be caused by COMODO Internet Security proactive defense. Cannot reproduce it anymore after I disabled proactive defense module. It is also reported to work ok with latest version of COMODO (4.0). Would somebody please resolve this issue with "no change required"? |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2008-08-23 15:21 | Vladimir Zhirov | New Issue | |
| 2008-08-23 15:21 | Vladimir Zhirov | Status | new => assigned |
| 2008-08-23 15:21 | Vladimir Zhirov | Assigned To | => Marc Weustink |
| 2008-08-23 15:21 | Vladimir Zhirov | Widgetset | => Win32 |
| 2008-08-29 10:54 | Vladimir Zhirov | Note Added: 0021770 | |
| 2008-11-10 14:08 | Vincent Snijders | LazTarget | => 1.0 |
| 2008-11-10 14:08 | Vincent Snijders | Note Added: 0023287 | |
| 2008-11-10 14:08 | Vincent Snijders | Status | assigned => feedback |
| 2008-11-10 14:08 | Vincent Snijders | Target Version | => 1.0.0 |
| 2008-11-16 10:05 | Vladimir Zhirov | Note Added: 0023388 | |
| 2008-11-16 10:27 | Vincent Snijders | Note Added: 0023390 | |
| 2008-11-19 06:37 | Vladimir Zhirov | Note Added: 0023428 | |
| 2008-11-19 06:49 | Vincent Snijders | Status | feedback => assigned |
| 2009-03-06 05:00 | Paul Ishenin | Note Added: 0025949 | |
| 2009-03-06 05:00 | Paul Ishenin | Status | assigned => feedback |
| 2009-03-06 14:45 | Vladimir Zhirov | Note Added: 0025958 | |
| 2009-03-06 15:44 | Paul Ishenin | Note Added: 0025959 | |
| 2009-03-10 22:15 | Vladimir Zhirov | Note Added: 0026034 | |
| 2009-03-10 23:58 | Paul Ishenin | Note Added: 0026036 | |
| 2009-03-11 18:39 | Vladimir Zhirov | Note Added: 0026059 | |
| 2009-03-12 02:32 | Paul Ishenin | Note Added: 0026063 | |
| 2009-03-13 08:31 | Vladimir Zhirov | Note Added: 0026079 | |
| 2009-03-13 09:00 | Paul Ishenin | Note Added: 0026082 | |
| 2009-03-13 09:01 | Vincent Snijders | Note Added: 0026083 | |
| 2009-03-13 18:36 | Vladimir Zhirov | Note Added: 0026093 | |
| 2009-03-13 18:42 | Vladimir Zhirov | Note Edited: 0026093 | |
| 2010-05-19 22:25 | Vladimir Zhirov | Note Added: 0037800 | |
| 2010-05-19 22:39 | Vincent Snijders | Status | feedback => resolved |
| 2010-05-19 22:39 | Vincent Snijders | Resolution | open => no change required |
| 2010-05-22 14:11 | Vladimir Zhirov | Status | resolved => closed |
| 2010-08-03 00:02 | Vincent Snijders | Relationship added | related to 0017089 |
