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POWhat does "Invalid address specified to RtlFreeHeap( 06450000, 08387460 )" mean?
 

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  1. POWhat does "Invalid address specified to RtlFreeHeap( 06450000, 08387460 )" mean?
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    <p>Sometimes I experience random crashes in my Delphi program. My program halts, and the Debugger outputs:</p> <p><strong>Invalid address specified to RtlFreeHeap( 06450000, 08387460 )</strong></p> <p>What does that mean? And what can possibly cause it?</p> <p>This is where the CPU Inspector stopped:</p> <p><strong>77BA0845 C6052582BD7700 mov byte ptr [$77bd8225],$00</strong></p> <p>Please note that they are very random (for me). Sometimes they don't appear at all.</p> <p>I am using the <strong>Skype4COM.dll</strong> from Skype - there's no source though.</p> <p>In case you need it, here is the code. I have commented most of the calls to Synchronize, so you know what they do.</p> <pre><code>//////////////////////////////////////////////////////////////////////////////// /// Execute //////////////////////////////////////////////////////////////////////////////// procedure TContactDeletor.Execute; Var I : Integer; UserObj : PUser; User : IUser; PauseEvent : TEvent; begin inherited; FreeOnTerminate := True; if Terminated then Exit; CoInitialize(Nil); // The F-Flags are to make sure TSkype events do not fire (from my Main Thread) FAllowUI := False; FUserIsBeingDeleted := False; FUseGroupUsersEvent := False; FUseRenameEvent := False; SkypeThr := TSkype.Create(Nil); SkypeThr.Attach(10,False); SkypeThr.Cache := False; MyList := TStringList.Create; PauseEvent := TEvent.Create(True); try // This fills my Stringlist Synchronize(GrabList); if Terminated then Exit; iMax := MyList.Count; // This sets the Max of my Progressbar Synchronize(SetMax); Try for I := 0 to MyList.Count - 1 do begin {while SkypeThr.AttachmentStatus &lt;&gt; apiAttachSuccess do begin SkypeThr.Attach(10,False); Synchronize(Procedure Begin Log('Skype Unavailable - Trying to reconnect ...'); End); PauseEvent.WaitFor(5000); end; } CurUser := ''; User := SkypeThr.User[MyList[I]]; CurUser := MyList[I]; Try User.IsAuthorized := False; User.BuddyStatus := budDeletedFriend; Except on E:Exception do begin ExErr := E.Message; ExLog := 'Error while deleting contacts: '; ExMsg := 'An Error has occured while deleting contacts: '; Synchronize( Procedure Begin Log(ExLog+ExErr+sLineBreak+' - Last logged Handle: '+CurUser); End ); end; end; iProgress := I+1; // This updates my log and my progressbar. Synchronize(UpdatePG); PauseEvent.WaitFor(100); if (I mod 200 = 0) and (I &gt; 0) then begin // Calls to Synchronize updates my log Synchronize(SyncPauseBegin); PauseEvent.WaitFor(3000); Synchronize(SyncPauseEnd); end; end; // Except Except on E:Exception do begin ExErr := E.Message; ExLog := 'Error while deleting contacts: '; ExMsg := 'An Error has occured while deleting contacts: '; Synchronize( Procedure Begin Log(ExMsg+ExErr+sLineBreak+' - Last logged Handle: '+CurUser); ErrMsg(ExMsg+ExErr+sLineBreak+sLineBreak+' - Last logged Handle: '+CurUser); End ); Exit; end; end; // This synchronizes my visual list. Synchronize(SyncList); finally FUserIsBeingDeleted := False; FUseGroupUsersEvent := True; FUseRenameEvent := True; FAllowUI := True; Synchronize( Procedure Begin frmMain.UpdateStatusBar; PleaseWait(False); ToggleUI(True); end); PauseEvent.Free; SkypeThr.Free; MyList.Free; CoUninitialize; end; end; </code></pre>
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    1. PO
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      1. PTAnswer
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    1. USJeff
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    1. PO
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    1. VO
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      1. POWhat does "Invalid address specified to RtlFreeHeap( 06450000, 08387460 )" mean?
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      1. VTUpMod
    2. VO
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      1. POWhat does "Invalid address specified to RtlFreeHeap( 06450000, 08387460 )" mean?
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      1. VTUpMod
    1. COSounds like you are allocating memory in one heap and trying to free it in another heap. My guess is that its a flaw in how you are driving this COM control, which is what is calling RtlFreeHeap I guess. Are you calling methods from different threads when you need to be calling them from the same thread?
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      1. POWhat does "Invalid address specified to RtlFreeHeap( 06450000, 08387460 )" mean?
      1. USDavid Heffernan
    2. COMeans you have corrupted your heap. Heap corruption is harder to track down and debug. But since you are experiencing this error randomly, you can start looking for a Race condition.
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      1. POWhat does "Invalid address specified to RtlFreeHeap( 06450000, 08387460 )" mean?
      1. USNajem
    3. CO@David - I use a few descendants from TThread, but they all have their own TSkype control. Also, only one descendant is running at a time
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      1. POWhat does "Invalid address specified to RtlFreeHeap( 06450000, 08387460 )" mean?
      1. USJeff
 

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