View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0020296 | FPC | RTL | public | 2011-09-19 09:50 | 2016-01-05 18:51 |
| Reporter | Ludo Brands | Assigned To | Marco van de Voort | ||
| Priority | normal | Severity | crash | Reproducibility | always |
| Status | resolved | Resolution | unable to reproduce | ||
| Platform | i386 | OS | Windows | ||
| Product Version | 2.7.1 | ||||
| Summary | 0020296: Recent changes in dwarf crash heaptrc in lnfodwrf.pp | ||||
| Description | lnfodwrf.pp has problems reading the dwarf debug info and crashes in LNFODWRF_SEEK$INT64. fpc 2.5.1 dated april 1 (I don't have the svn version) doesn't have this problem. Note that lazarus svn defaults now to dwarf on windows. | ||||
| Steps To Reproduce | program test; var p:pointer; begin getmem(p,5); end. compile with -gw2 -gl -gh and run. Output: Heap dump by heaptrc unit 1 memory blocks allocated : 5/8 0 memory blocks freed : 0/0 1 unfreed memory blocks : 5 True heap size : 98304 (80 used in System startup) True free heap : 98144 Should be : 98152 Call trace for block $00065180 size 5 Runtime error 131 at $0040B451 $0040B451 $0040BD4C $0040C1F2 $0040C282 $00409303 $0040AFB7 $00408381 | ||||
| Tags | No tags attached. | ||||
| Fixed in Revision | |||||
| FPCOldBugId | |||||
| FPCTarget | |||||
| Attached Files |
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| has duplicate | 0023030 | resolved | Jonas Maebe | Cannot run heaptrc when compiling with Dwarf with sets ( -gw -godwarfsets) on Win64 |
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Debugged lnfodwrf.pp. The problem is that the program assumes that information in .debug_line consists of a contiguous sequence of valid line information blocks. This is a shortcut that apparently worked at one time. Now rubbish is inserted in between line info blocks. To correct this, compilation units have to be fetched from .debug_info and the DW_AT_stmt_list attribute give the offset in .debug_line. |
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debug_info is dwarf2 specific afaik, so probably need to fallback to the old behaviour if debug_info is not found. (added later), hmm, might be wrong, spec says .debug was renamed to .debug_info, so it is still possible it is in dwarf1, just in different section. |
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FPC does not and has never supported DWARF1. |
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Can somebody have a look at this? If this is the cause of the problems with debugging Lazarus programs, it would be nice to have this fixed. |
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This seems fixed meanwhile: with r28606: Heap dump by heaptrc unit 1 memory blocks allocated : 5/8 0 memory blocks freed : 0/0 1 unfreed memory blocks : 5 True heap size : 98304 (80 used in System startup) True free heap : 98144 Should be : 98152 Call trace for block $01709350 size 5 $00401457 line 5 of debug.lpr $30303030 $41003030 $53554C4C $50535245 $49464F52 $433D454C $72505C3A |
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Old report, seems to be already fixed, as Reinier says. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2011-09-19 09:50 | Ludo Brands | New Issue | |
| 2011-09-19 19:50 | Ludo Brands | Note Added: 0052039 | |
| 2011-10-13 21:59 | Marco van de Voort | Note Added: 0052957 | |
| 2011-10-13 22:00 | Marco van de Voort | Note Edited: 0052957 | |
| 2011-10-13 22:13 | Marco van de Voort | Note Edited: 0052957 | |
| 2011-10-14 00:29 | Jonas Maebe | Note Added: 0052963 | |
| 2012-10-01 10:55 | Martin Friebe | Relationship added | related to 0023030 |
| 2012-10-01 13:20 | Jonas Maebe | Relationship replaced | has duplicate 0023030 |
| 2013-03-28 10:35 |
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Note Added: 0066596 | |
| 2014-09-06 13:38 |
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Note Added: 0076930 | |
| 2014-09-06 14:09 |
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Status | new => feedback |
| 2014-09-06 15:55 | Marco van de Voort | Note Added: 0076937 | |
| 2014-09-06 15:55 | Marco van de Voort | Status | feedback => resolved |
| 2014-09-06 15:55 | Marco van de Voort | Resolution | open => unable to reproduce |
| 2014-09-06 15:55 | Marco van de Voort | Assigned To | => Marco van de Voort |
