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Thread: Memory Error

  1. 7th May 2010, 12:06 #1
    spongebob
    spongebob is offline Beginner
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    Default Memory Error

    Hello All,
    I was wondering what kind of wrong coding could run that kind of error :

    It happens when I quit my program :
    Qt Code: 
    1. ======= Memory map: ========
    2. 08048000-080e8000 r-xp 00000000 08:08 240106     /home/anthony/Bureau/DOUCHE/TALC/Talc
    3. 080e8000-080e9000 r--p 000a0000 08:08 240106     /home/anthony/Bureau/DOUCHE/TALC/Talc
    4. 080e9000-080ea000 rw-p 000a1000 08:08 240106     /home/anthony/Bureau/DOUCHE/TALC/Talc
    5. 080ea000-080eb000 rw-p 080ea000 00:00 0
    6. 0925c000-0a3a9000 rw-p 0925c000 00:00 0          [heap]
    7. af700000-af721000 rw-p af700000 00:00 0
    8. af721000-af800000 ---p af721000 00:00 0
    9. af852000-b0263000 r--p 00000000 08:08 442431     /usr/share/fonts/truetype/sazanami/sazanami-mincho.ttf
    10. b0263000-b0269000 r--p 00000000 08:08 807923     /usr/share/fonts/truetype/latex-xft-fonts/cmsy10.ttf
    11. b0269000-b02db000 r--p 00000000 08:08 385554     /usr/share/fonts/truetype/freefont/FreeSans.ttf
    12. b02db000-b0301000 r--p 00000000 08:08 856396     /usr/share/fonts/truetype/ttf-telugu-fonts/lohit_te.ttf
    13. b0301000-b032f000 r--p 00000000 08:08 856378     /usr/share/fonts/truetype/ttf-kannada-fonts/lohit_kn.ttf
    14. b032f000-b0342000 r--p 00000000 08:08 420848     /usr/share/fonts/truetype/ttf-indic-fonts-core/lohit_hi.ttf
    15. b0342000-b0356000 r--p 00000000 08:08 420849     /usr/share/fonts/truetype/ttf-indic-fonts-core/lohit_gu.ttf
    16. b0356000-b0378000 r--p 00000000 08:08 856362     /usr/share/fonts/truetype/ttf-bengali-fonts/lohit_bn.ttf
    17. b0378000-b0594000 r--p 00000000 08:08 680121     /usr/share/fonts/truetype/unfonts/UnDotum.ttf
    18. b0594000-b0cea000 r--p 00000000 08:08 442424     /usr/share/fonts/truetype/sazanami/sazanami-gothic.ttf
    19. b0cea000-b0d18000 r--p 00000000 08:08 420846     /usr/share/fonts/truetype/ttf-indic-fonts-core/MuktiNarrow.ttf
    20. b0d18000-b212d000 r--p 00000000 08:08 442400     /usr/share/fonts/truetype/arphic/uming.ttc
    21. b212d000-b218d000 rw-s 00000000 00:09 1343501    /SYSV00000000 (deleted)
    22. b218d000-b218f000 rwxp 00000000 00:0f 766        /dev/zero
    23. b218f000-b35a4000 r--p 00000000 08:08 442400     /usr/share/fonts/truetype/arphic/uming.ttc
    24. b35a4000-b35b8000 r--p 00000000 08:08 418755     /usr/share/fonts/type1/gsfonts/n019003l.pfb
    25. b35b8000-b3644000 r--p 00000000 08:08 680038     /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans-Bold.ttf
    26. b3644000-b3695000 r--p 00000000 08:08 685067     /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans-ExtraLight.ttf
    27. b3695000-b36d8000 rw-p 00000000 00:0f 766        /dev/zero
    28. b36d8000-b36f9000 r--p 00000000 08:08 550533     /usr/share/fonts/truetype/ttf-liberation/LiberationSans-Regular.ttf
    29. b36f9000-b374b000 r-xp 00000000 08:08 331549     /usr/lib/libtiff.so.4.2.1
    30. b374b000-b374c000 ---p 00052000 08:08 331549     /usr/lib/libtiff.so.4.2.1
    31. b374c000-b374e000 r--p 00052000 08:08 331549     /usr/lib/libtiff.so.4.2.1
    32. b374e000-b374f000 rw-p 00054000 08:08 331549     /usr/lib/libtiff.so.4.2.1
    33. b374f000-b37a1000 r-xp 00000000 08:08 319910     /usr/lib/libQtSvg.so.4.5.0
    34. b37a1000-b37a2000 ---p 00052000 08:08 319910     /usr/lib/libQtSvg.so.4.5.0
    35. b37a2000-b37a3000 r--p 00052000 08:08 319910     /usr/lib/libQtSvg.so.4.5.0
    36. b37a3000-b37a4000 rw-p 00053000 08:08 319910     /usr/lib/libQtSvg.so.4.5.0
    37. b37a8000-b37bf000 r--p 00000000 08:08 856384     /usr/share/fonts/truetype/ttf-oriya-fonts/lohit_or.ttf
    38. b37bf000-b37ef000 r-xp 00000000 08:08 334345     /usr/lib/liblcms.so.1.0.18
    39. b37ef000-b37f0000 r--p 00030000 08:08 334345     /usr/lib/liblcms.so.1.0.18
    40. b37f0000-b37f1000 rw-p 00031000 08:08 334345     /usr/lib/liblcms.so.1.0.18
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    Here is what i am doing :

    Qt Code: 
    1. TalkWindow::saveConf();
    2.  
    3.     list<MotionStyle*>::iterator            mScenesIt;
    4.     list<Source*>::iterator                 mSourcesIt;
    5.     list<Font*>::iterator                   mFontsIt;
    6.  
    7.     //map<std::string, QTimer*>::iterator       mTimersIt;
    8.  
    9.     /*if (mDisplayStyle->isStarted())
    10.         mDisplayStyle->stop();*/
    11.     TalkWindow::on_stopButton_clicked();
    12.  
    13.     delete mDisplayStyle;
    14.  
    15.     for (mSourcesIt = mSources.begin(); mSourcesIt != mSources.end(); mSourcesIt++)
    16.     {
    17.         delete *mSourcesIt;
    18.         mSourcesIt = mSources.erase(mSourcesIt);
    19.     }
    20.  
    21.     for (mScenesIt = mScenes.begin(); mScenesIt != mScenes.end(); mScenesIt++)
    22.     {
    23.         delete *mScenesIt;
    24.         mScenesIt = mScenes.erase(mScenesIt);
    25.     }
    26.  
    27.     /*for (mTimersIt = mTimers.begin(); mTimersIt != mTimers.end(); mTimersIt++)
    28.         delete mTimersIt->second;
    29.  
    30.     mTimers.clear();*/
    31.  
    32.     for (mFontsIt = mFonts.begin(); mFontsIt != mFonts.end(); mFontsIt++)
    33.     {
    34.         delete *mFontsIt;
    35.         mFontsIt = mFonts.erase(mFontsIt);
    36.     }
    37.  
    38.     if(mCheckInfosTimer)
    39.         mCheckInfosTimer->stop();
    40.    // delete mCheckInfosTimer;
    41.  
    42.     mPomme->destroy();
    43.     delete mPomme;
    44. }
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    Thank you for everything.
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  2. 7th May 2010, 12:38 #2
    ^NyAw^'s Avatar
    ^NyAw^
    ^NyAw^ is offline Advanced user
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    Default Re: Memory Error

    Hi,

    First of all, use a debugger to debug your application. Step by step will help you to find the error code line as it is a runtime error.
    Second, it seems that you delete something in the memory and then you tell "mSources" to erase it. Since the memory object has been destroyed it can't be erased and so it crashes.
    Òscar Llarch i Galán
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  3. 7th May 2010, 13:27 #3
    borisbn
    borisbn is offline Intermediate user
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    Default Re: Memory Error

    you shouldn't do mSourcesIt++, mScenes++ and mFonts++ because erase
    Return value
    A random access iterator pointing to the new location of the element that followed the last element erased by the function call, which is the vector end if the operation erased the last element in the sequence.
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