[Kde-games-devel] Review Request: Bug 304362 KsirK crashes on "new game" after one is already finished

Nemanja Hirsl nemhirsl at gmail.com
Sun Sep 23 23:03:51 UTC 2012 

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http://svn.reviewboard.kde.org/r/7045/
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(Updated Sept. 23, 2012, 11:03 p.m.)


Review request for KDE Games.


Changes
-------

Updated according to Ian's recommendation. It is cleaner, better and really simplifies things.


Description
-------

Code analysis:
 - PlayerList is list of KPlayer*; 
 - Iterators became messed up in qDeleteAll (still crashing); 
 - pulled out deletion from qDeleteAll to my own loop (still crashing);  
 - KPlayer destructor analyzed - When object is deleted, it get pulled out from the game (playerList), modifying original playerList. This is the problem because iterators to a QList became invalid after any (insertion or) removal!

In KPlayer::~KPlayer() see  game()->playerDeleted(this); 
In  KGame::playerDeleted(KPlayer *player) see systemRemovePlayer(player,false); 
in KGame::systemRemovePlayer(KPlayer* player,bool deleteit) see  systemRemove(player,deleteit); 
Finally result = d->mPlayerList.removeAll(p);

I've created simple example to demonstrate what exactly is happening in the 
code. Take a look at http://pastebin.com/KcyfenQc for details about example. 
Useful link is also http://stackoverflow.com/questions/8657244/does-qts-qlist-
save-iterators-after-containers-modifications


Diffs (updated)
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  /trunk/KDE/kdegames/ksirk/ksirk/GameLogic/gameautomaton.cpp 1309567 

Diff: http://svn.reviewboard.kde.org/r/7045/diff/


Testing
-------

Tests performed:
1.  New local game with 5 players (1 human - Baudouin, 4 AI)
1.1 During AI turn start a new game.
1.2 In original code crash happens. Debug traces:
    ksirk(24791) Ksirk::KGameWindow::actionNewGame: valid
    ksirk(24791)/libkdegames (KGame) KGame::setGameStatus: : GAMESTATUS CHANGED  to 3
    ksirk(24791) Ksirk::GameLogic::GameAutomaton::slotPropertyChanged: 6  (skin is  28672 )
    ksirk(24791) Ksirk::GameLogic::GameAutomaton::slotPropertyChanged: END GameAutomaton::slotPropertyChanged  6  (skin is  28672 )
    ksirk(24791) Ksirk::GameLogic::GameAutomaton::removeAllPlayers:
    ksirk(24791)/libkdegames (KGame) KPlayer::~KPlayer: : this= KPlayer(0x3224b90) , id= 1025
    ksirk(24791)/libkdegames (KGame) KGameIO::~KGameIO: : this= KGameIO(0x3225a00)
    ksirk(24791)/libkdegames (KGame) KPlayer::removeGameIO: : KGameIO(0x3225a00) delete= false
    ksirk(24791)/libkdegames (KGame) KGame::playerDeleted: : id ( 1025 ) to be removed KPlayer(0x3224b90)
    ksirk(24791)/libkdegames (KGame) KGame::systemRemovePlayer:
    ksirk(24791)/libkdegames (KGame) KGame::systemRemove: : Player ( 1025 ) to be removed KPlayer(0x3224b90)
    ksirk(24791)/libkdegames (KGame) KGame::playerDeleted: : sending IdRemovePlayer  1025
    ksirk(24791)/libkdegames (KGame) KPlayer::~KPlayer: done
    ksirk(24791) Ksirk::GameLogic::AIPlayer::~AIPlayer: "Victor Emmanuel"
    ksirk(24791)/libkdegames (KGame) KPlayer::~KPlayer: : this= KPlayer(0x3227e10) , id= 1027
    ksirk(24791)/libkdegames (KGame) KGameIO::~KGameIO: : this= KGameIO(0x3ca81b0)
    ksirk(24791)/libkdegames (KGame) KPlayer::removeGameIO: : KGameIO(0x3ca81b0) delete= false
    ksirk(24791)/libkdegames (KGame) KGame::playerDeleted: : id ( 1027 ) to be removed KPlayer(0x3227e10)
    ksirk(24791)/libkdegames (KGame) KGame::systemRemovePlayer:
    ksirk(24791)/libkdegames (KGame) KGame::systemRemove: : Player ( 1027 ) to be removed KPlayer(0x3227e10)
    ksirk(24791)/libkdegames (KGame) KGame::playerDeleted: : sending IdRemovePlayer  1027
    ksirk(24791)/libkdegames (KGame) KPlayer::~KPlayer: done
    ksirk(24791) Ksirk::GameLogic::AIPlayer::~AIPlayer: "Elisabeth"
    ksirk(24791)/libkdegames (KGame) KPlayer::~KPlayer: : this= KPlayer(0x3179e30) , id= 1029
    ksirk(24791)/libkdegames (KGame) KGameIO::~KGameIO: : this= KGameIO(0x317b6f0)
    ksirk(24791)/libkdegames (KGame) KPlayer::removeGameIO: : KGameIO(0x317b6f0) delete= false
    ksirk(24791)/libkdegames (KGame) KGame::playerDeleted: : id ( 1029 ) to be removed KPlayer(0x3179e30)
    ksirk(24791)/libkdegames (KGame) KGame::systemRemovePlayer:
    ksirk(24791)/libkdegames (KGame) KGame::systemRemove: : Player ( 1029 ) to be removed KPlayer(0x3179e30)
    ksirk(24791)/libkdegames (KGame) KGame::playerDeleted: : sending IdRemovePlayer  1029
    ksirk(24791)/libkdegames (KGame) KPlayer::~KPlayer: done
    KCrash: Application 'ksirk' crashing...

    Notice how order of AI Players is messed up. Order of players is shown below where first name (human - Baudouin was not printed)
1.3 After applying this patch debug crash is prevented and debug traces are:
    ksirk(24998) Ksirk::KGameWindow::actionNewGame: valid
    ksirk(24998)/libkdegames (KGame) KGame::setGameStatus: : GAMESTATUS CHANGED  to 3
    ksirk(24998) Ksirk::GameLogic::GameAutomaton::slotPropertyChanged: 6  (skin is  28672 )
    ksirk(24998) Ksirk::GameLogic::GameAutomaton::slotPropertyChanged: END GameAutomaton::slotPropertyChanged  6  (skin is  28672 )
    ksirk(24998) Ksirk::GameLogic::GameAutomaton::removeAllPlayers:
    ksirk(24998)/libkdegames (KGame) KPlayer::~KPlayer: : this= KPlayer(0x2bfa110) , id= 1030
    ksirk(24998)/libkdegames (KGame) KGameIO::~KGameIO: : this= KGameIO(0xa1c8f0)
    ksirk(24998)/libkdegames (KGame) KPlayer::removeGameIO: : KGameIO(0xa1c8f0) delete= false
    ksirk(24998)/libkdegames (KGame) KGame::playerDeleted: : id ( 1030 ) to be removed KPlayer(0x2bfa110)
    ksirk(24998)/libkdegames (KGame) KGame::systemRemovePlayer:
    ksirk(24998)/libkdegames (KGame) KGame::systemRemove: : Player ( 1030 ) to be removed KPlayer(0x2bfa110)
    ksirk(24998)/libkdegames (KGame) KGame::playerDeleted: : sending IdRemovePlayer  1030
    ksirk(24998)/libkdegames (KGame) KPlayer::~KPlayer: done
    ksirk(24998) Ksirk::GameLogic::AIPlayer::~AIPlayer: "de Gaulle"
    ksirk(24998)/libkdegames (KGame) KPlayer::~KPlayer: : this= KPlayer(0x29ffd10) , id= 1031
    ksirk(24998)/libkdegames (KGame) KGameIO::~KGameIO: : this= KGameIO(0x2bf3b30)
    ksirk(24998)/libkdegames (KGame) KPlayer::removeGameIO: : KGameIO(0x2bf3b30) delete= false
    ksirk(24998)/libkdegames (KGame) KGame::playerDeleted: : id ( 1031 ) to be removed KPlayer(0x29ffd10)
    ksirk(24998)/libkdegames (KGame) KGame::systemRemovePlayer:
    ksirk(24998)/libkdegames (KGame) KGame::systemRemove: : Player ( 1031 ) to be removed KPlayer(0x29ffd10)
    ksirk(24998)/libkdegames (KGame) KGame::playerDeleted: : sending IdRemovePlayer  1031
    ksirk(24998)/libkdegames (KGame) KPlayer::~KPlayer: done
    ksirk(24998) Ksirk::GameLogic::AIPlayer::~AIPlayer: "Victor Emmanuel"
    ksirk(24998)/libkdegames (KGame) KPlayer::~KPlayer: : this= KPlayer(0x42c4020) , id= 1032
    ksirk(24998)/libkdegames (KGame) KGameIO::~KGameIO: : this= KGameIO(0x35811d0)
    ksirk(24998)/libkdegames (KGame) KPlayer::removeGameIO: : KGameIO(0x35811d0) delete= false
    ksirk(24998)/libkdegames (KGame) KGame::playerDeleted: : id ( 1032 ) to be removed KPlayer(0x42c4020)
    ksirk(24998)/libkdegames (KGame) KGame::systemRemovePlayer:
    ksirk(24998)/libkdegames (KGame) KGame::systemRemove: : Player ( 1032 ) to be removed KPlayer(0x42c4020)
    ksirk(24998)/libkdegames (KGame) KGame::playerDeleted: : sending IdRemovePlayer  1032
    ksirk(24998)/libkdegames (KGame) KPlayer::~KPlayer: done
    ksirk(24998) Ksirk::GameLogic::AIPlayer::~AIPlayer: "Akihito"
    ksirk(24998)/libkdegames (KGame) KPlayer::~KPlayer: : this= KPlayer(0x357c400) , id= 1033
    ksirk(24998)/libkdegames (KGame) KGameIO::~KGameIO: : this= KGameIO(0x3b16240)
    ksirk(24998)/libkdegames (KGame) KPlayer::removeGameIO: : KGameIO(0x3b16240) delete= false
    ksirk(24998)/libkdegames (KGame) KGame::playerDeleted: : id ( 1033 ) to be removed KPlayer(0x357c400)
    ksirk(24998)/libkdegames (KGame) KGame::systemRemovePlayer:
    ksirk(24998)/libkdegames (KGame) KGame::systemRemove: : Player ( 1033 ) to be removed KPlayer(0x357c400)
    ksirk(24998)/libkdegames (KGame) KGame::playerDeleted: : sending IdRemovePlayer  1033
    ksirk(24998)/libkdegames (KGame) KPlayer::~KPlayer: done
    ksirk(24998) Ksirk::GameLogic::AIPlayer::~AIPlayer: "Elisabeth"
    ksirk(24998)/libkdegames (KGame) KPlayer::~KPlayer: : this= KPlayer(0x2a730f0) , id= 1034
    ksirk(24998)/libkdegames (KGame) KGameIO::~KGameIO: : this= KGameIO(0x2a27fd0)
    ksirk(24998)/libkdegames (KGame) KPlayer::removeGameIO: : KGameIO(0x2a27fd0) delete= false
    ksirk(24998)/libkdegames (KGame) KGame::playerDeleted: : id ( 1034 ) to be removed KPlayer(0x2a730f0)
    ksirk(24998)/libkdegames (KGame) KGame::systemRemovePlayer:
    ksirk(24998)/libkdegames (KGame) KGame::systemRemove: : Player ( 1034 ) to be removed KPlayer(0x2a730f0)
    ksirk(24998)/libkdegames (KGame) KGame::playerDeleted: : sending IdRemovePlayer  1034
    ksirk(24998)/libkdegames (KGame) KPlayer::~KPlayer: done
    ksirk(24998) Ksirk::GameLogic::GameAutomaton::state: new state (id= 0 ) is  INIT
    
    Notice the correct order of all Players; all players removed correctly.


2.  New standard TCP/IP game with patch applied
2.1 No issues noticed.


Thanks,

Nemanja Hirsl

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