VM crash, reproducible, involving 15-Puzzle 1-1.1

> Despite: "Maturity level/Rock solid - Useable and hasn't had bugs for a
> long time."
>
> The following occurs reproducibly on a bog-standard winXPSP2 box:
>
> * Install Squeak3.9-final-7067
> * Install squeak-dev-72-2
> * Launch squeak-dev-72-2.image
> * World menu -> old desktop menu -> open ... -> SqueakMap Package Loader
> * Select 15-Puzzle (-> 1.1)
> * Menu -> first two items are "install" and "email package maintainers"
> * Latter produces the "gaelli@" email address I'm copying this to
> * Former produces "error occurred during install". Puzzle appears anyway
> * Scramble and unscramble puzzle works normally
> * World menu -> old desktop menu -> previous project returns to main
>   world
> * There a debugger can be seen. Bug report below. Upshot: seems a
>   Player56 instance's scripts ivar is ending up an integer instead of an
>   IdentityDictionary.
> * Open a system browser and find some method. Pick senders of. Pick a
>   method. Witness "primitive failed" debugger.
> * Cause is a corrupt CompiledMethod object; senders grovels over all
>   compiled methods in the system. This particular CompiledMethod object
>   is for Player57's setEmptyCell: method.
> * Yes -- that would be *your* Player57 class, Gaelli. :)
> * To recover normal behavior, unloading the "1415 Puzzle" world seems
>   called-for. X the window and get another attempt to invoke an
>   IdentityDictionary method on a SmallInteger.
> * Do a little digging and discover that Player56 can have its "scripts"
>   ivar reset with jettisonScripts
> * Open an inspector on the Player56 instance causing all the trouble and
>   eval "self jettisonScripts"
> * The icing on the cake: clicking the "1415 Puzzle" world window to try
>   again to close it now crashes the VM(!).
>
> At least 4 separate bugs here.
> * In 15-Puzzle 1.1: package install/startup constructs a Player56 with
>   an integer in place of an IdentityDictionary in "scripts" ivar (ivar
>   defined in superclass Player).
> * Somehow, this causes a corrupt CompiledMethod for
>   Player57>>setEmptyCell: to exist. Curiously, a normal version coexists
>   with it! I suspect this is a VM error involving a dangling pointer.
>   This may in turn indicate a Slang-to-C translator error.
> * In VM, something that causes a crash. It is probably the same or
>   another dangling pointer.
> * In system tools: a single corrupt CompiledMethod makes "senders of"
>   functionality useless. No failover. ("Proceed" causes the same corrupt
>   method to keep popping up errors, apparently in an infinite loop.)
>   In the particular case caused by the 15 puzzle, the CompiledMethod
>   ends up with a "numLiterals" of zero (the proximate cause of the
>   primitive failure) and a class that is an integer instead of a Class,
>   FWIW. In any event, the system tools should provide some ability to
>   recover, perhaps by ignoring or logging corrupt methods.
>
> 15 puzzle bug (generated bug report for the error during install):
>
> 10 January 2007 2:52:02 am
>
> VM: Win32 - a SmalltalkImage
> Image: Squeak3.9 [latest update: #7067]
>
> SecurityManager state:
> Restricted: false
> FileAccess: true
> SocketAccess: true
> Working Dir C:\squeak
> Trusted Dir C:\squeak\HP_Administrator
> Untrusted Dir C:\My Squeak\HP_Administrator
>
> SmallInteger(Object)>>doesNotUnderstand: #removeKey:ifAbsent:
>     Receiver: 89276551
>     Arguments and temporary variables:
>         aMessage:     removeKey: nil ifAbsent: [] in Player56
> class(Player class)>>cleanseS...etc...
>     Receiver's instance variables:
> 89276551
>
> Player56 class(Player class)>>cleanseScriptsOfNilKeys
>     Receiver: Player56
>     Arguments and temporary variables:
>
>     Receiver's instance variables:
>         superclass:     Player
>         methodDict:     a MethodDictionary(#moveNumber->a CompiledMethod
> (1619) )
>         format:     136
>         instanceVariables:     nil
>         organization:     ('scripts' moveNumber)
>
>         subclasses:     nil
>         name:     #Player56
>         classPool:     nil
>         sharedPools:     nil
>         environment:     a SystemDictionary(lots of globals)
>         category:     #UserObjects
>         traitComposition:     an IdentityDictionary(#moveNumber->A
> UniclassScript - selecto...etc...
>         localSelectors:     an IdentityDictionary()
>         scripts:     <<error during printing>>
>
> Player56 class(Player class)>>scripts
>     Receiver: Player56
>     Arguments and temporary variables:
>
>     Receiver's instance variables:
>         superclass:     Player
>         methodDict:     a MethodDictionary(#moveNumber->a CompiledMethod
> (1619) )
>         format:     136
>         instanceVariables:     nil
>         organization:     ('scripts' moveNumber)
>
>         subclasses:     nil
>         name:     #Player56
>         classPool:     nil
>         sharedPools:     nil
>         environment:     a SystemDictionary(lots of globals)
>         category:     #UserObjects
>         traitComposition:     an IdentityDictionary(#moveNumber->A
> UniclassScript - selecto...etc...
>         localSelectors:     an IdentityDictionary()
>         scripts:     <<error during printing>>
>
> Player56(Player)>>methodInterfacesForScriptsCategoryIn:
>     Receiver: a Player56 (3795) named Cell16
>     Arguments and temporary variables:
>         aVocabulary:     an EToyVocabulary named "eToy"
>         myScripts:     nil
>         us:     nil
>     Receiver's instance variables:
>         dependents:     nil
>         costume:     a PasteUpMorph<Cell16>(2009)
>         costumes:     nil
>
>
> --- The full stack ---
> SmallInteger(Object)>>doesNotUnderstand: #removeKey:ifAbsent:
> Player56 class(Player class)>>cleanseScriptsOfNilKeys
> Player56 class(Player class)>>scripts
> Player56(Player)>>methodInterfacesForScriptsCategoryIn:
>  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> Player56(Object)>>methodInterfacesForCategory:inVocabulary:limitClass:
> Player56(Object)>>tilePhrasesForCategory:inViewer:
> CategoryViewer>>categoryWording:
> CategoryViewer>>chosenCategorySymbol:
> CategoryViewer>>chooseCategoryWhoseTranslatedWordingIs:
> CategoryViewer>>initializeFor:categoryChoice:
> StandardViewer>>categoryViewerFor:
> StandardViewer>>addCategoryViewerFor:atEnd:
> StandardViewer>>addCategoryViewerFor:
> StandardViewer>>addCategoryViewer
> StandardViewer>>initializeFor:barHeight:includeDismissButton:showCategories:
>
> StandardViewer>>initializeFor:barHeight:includeDismissButton:
> StandardViewer>>initializeFor:barHeight:
> Presenter>>viewMorph:
> ViewerFlapTab>>unhibernate
> ViewerFlapTab(FlapTab)>>adaptToWorld
> [] in PasteUpMorph>>installFlaps {[:aFlapTab | aFlapTab adaptToWorld]}
> OrderedCollection>>do:
> PasteUpMorph>>installFlaps
> PasteUpMorph>>install
> Project>>enter:revert:saveForRevert:
> Project>>enter
> ProjectEntryNotification>>defaultAction
> UndefinedObject>>handleSignal:
> MethodContext(ContextPart)>>handleSignal:
> MethodContext(ContextPart)>>handleSignal:
> MethodContext(ContextPart)>>handleSignal:
> MethodContext(ContextPart)>>handleSignal:
> MethodContext(ContextPart)>>handleSignal:
> ProjectEntryNotification(Exception)>>signal
> ProjectEntryNotification(Exception)>>signal:
> ProjectEntryNotification class>>signal:
> ProjectLoading class>>openName:stream:fromDirectory:withProjectView:
> [] in ProjectLoading class>>openFromDirectory:andFileName:
> {[ProgressNotification signal: '1:foundMostRecent'.  fileAndDir := self
> bestA...]}
> BlockContext>>on:do:
> [] in ComplexProgressIndicator>>withProgressDo: {[aBlock   on:
> ProgressInitiationException   do: [:ex | ex     sendNotificati...]}
> BlockContext>>on:do:
> ComplexProgressIndicator>>withProgressDo:
> ProjectLoading class>>openFromDirectory:andFileName:
> [] in SMProjectInstaller>>install {[ProjectLoading openFromDirectory:
> dir andFileName: fileName]}
> ...etc...
>
>
>
> The VM crash log curiously indicates the VM version to be quite a bit
> earlier than 3.9. Possible there's a mismatch between squeak-dev and
> squeak? I downloaded the latest of both, after determining that
> squeak-dev by itself was not a complete Squeak install. In fact, there's
> an even more embarrassing fifth bug -- install just Squeak 3.9 7067
> directly from the zip to any directory, drag the 7067 image into the
> executable, click Workspace, and click "SMLoader open" in Workspace --
> guess what? SmallInteger doesNotUnderstand: #numbers ... is there a
> pattern here? Everything seems to boil down to SmallIntegers in places
> where they don't belong. I'm starting to suspect that the system is
> mistaking object pointers for integers and integers for object pointers
> here and there. That would explain everything, including the VM crashes.
> It would also betray a serious lack of testing and polish, unless it's a
> weird system-dependent bug, but Squeak should be well tested on x86 boxen.
>
> FWIW, system specs are:
> CPU: AMD64 dual-core XP2000
> OS: Windows XP MCE, 32-bit, SP2
> Video: eVGA -> nVidia GeForce GS6800
> Sound: some generic POS, not actually exercised in the occurring of
> these crashes
> Memory: about 3/4 of 1GB in use and 1/4 free according to Task Manager
> Disk: about 2/5 of 250GB free
>
> Version of Squeak downloaded was Win32 (I didn't see a win64 one anyway,
> not that it would likely have worked).
>
> Log from an instance of the VM crash:
>
> ---------------------------------------------------------------------
> Wed Jan 10 02:38:50 2007
>
> Exception code: C0000005
> Exception addr: 00412165
> Access violation (read access) at 054DFFC8
> EAX:054DFFC8    EBX:0267441C    ECX:026795C4    EDX:00000000
> ESI:005203F0    EDI:018DED7C    EBP:0006FC50    ESP:0006FC1C
> EIP:00412165    EFL:00010212
> FP Control: FFFF037F
> FP Status:  FFFF4020
> FP Tag:     FFFFFFFF
> VM Version: Squeak 3.7.1 (release) from Sep 23 2004
> Compiler: gcc 2.95.2 19991024 (release)
>
> Current byte code: 209
> Primitive index: 77
>
> Loaded plugins:
>     DSAPrims 23 September 2004 (i)
>     ZipPlugin 23 September 2004 (i)
>     SocketPlugin 23 September 2004 (i)
>     LargeIntegers v1.3 23 September 2004 (i)
>     Matrix2x3Plugin 23 September 2004 (i)
>     FloatArrayPlugin 23 September 2004 (i)
>     B2DPlugin 23 September 2004 (i)
>     BitBltPlugin 23 September 2004 (i)
>     SecurityPlugin 23 September 2004 (i)
>     FilePlugin 23 September 2004 (i)
>     MiscPrimitivePlugin 23 September 2004 (i)
>
>
> Stack dump:
>
> 53568028 Behavior>allInstancesDo:
> 53567116 Behavior>allSubInstancesDo:
> 53567684 [] in Project>enter:revert:saveForRevert:
> 53566956 Dictionary>at:ifPresentAndInMemory:
> 48568348 Project>enter:revert:saveForRevert:
> 48569980 ProjectViewMorph>enter
> 48569888 ProjectViewMorph>mouseUp:
> 48569756 Morph>handleMouseUp:
> 48569664 MouseButtonEvent>sentTo:
> 48569572 Morph>handleEvent:
> 48569204 Morph>handleFocusEvent:
> 48569296 [] in HandMorph>sendFocusEvent:to:clear:
> 48569388 [] in PasteUpMorph>becomeActiveDuring:
> 48569112 BlockContext>on:do:
> 48569020 PasteUpMorph>becomeActiveDuring:
> 48568836 HandMorph>sendFocusEvent:to:clear:
> 48568744 HandMorph>sendEvent:focus:clear:
> 48568652 HandMorph>sendMouseEvent:
> 48568256 HandMorph>handleEvent:
> 48567936 HandMorph>processEvents
> 48568028 [] in WorldState>doOneCycleNowFor:
> 48567844 SequenceableCollection>do:
> 48567752 WorldState>handsDo:
> 48567660 WorldState>doOneCycleNowFor:
> 48567568 WorldState>doOneCycleFor:
> 48567476 PasteUpMorph>doOneCycle
> 48216052 [] in >spawnNewProcess
> 48216236 [] in BlockContext>newProcess
>
> ---------------------------------------------------------------------
> Wed Jan 10 03:02:09 2007
>
> Exception code: C0000005
> Exception addr: 00427242
> Access violation (read access) at 15797480
> EAX:0ABCBA40    EBX:81BF3194    ECX:026C99E0    EDX:026CD798
> ESI:00001378    EDI:00520580    EBP:00520580    ESP:0006FB64
> EIP:00427242    EFL:00010202
> FP Control: FFFF037F
> FP Status:  FFFF0120
> FP Tag:     FFFFFFFF
> VM Version: Squeak 3.7.1 (release) from Sep 23 2004
> Compiler: gcc 2.95.2 19991024 (release)
>
> Current byte code: 46
> Primitive index: 71
>
> Loaded plugins:
>     SocketPlugin 23 September 2004 (i)
>     ZipPlugin 23 September 2004 (i)
>     DSAPrims 23 September 2004 (i)
>     LargeIntegers v1.3 23 September 2004 (i)
>     Matrix2x3Plugin 23 September 2004 (i)
>     FloatArrayPlugin 23 September 2004 (i)
>     B2DPlugin 23 September 2004 (i)
>     BitBltPlugin 23 September 2004 (i)
>     SecurityPlugin 23 September 2004 (i)
>     FilePlugin 23 September 2004 (i)
>     MiscPrimitivePlugin 23 September 2004 (i)
>
>
> Stack dump:
>
>
>
>

> This is a well-known problem and has really nothing to do with the level
> of stability claimed for the project at SqueakMap - none of the projects
> that were made for <3.9 will work in 3.9 proper if they involve scripting.
>
> Cheers,
>    - Andreas
>
> John Ersatznom wrote:
> > Despite: "Maturity level/Rock solid - Useable and hasn't had bugs for a
> > long time."
> >
> > The following occurs reproducibly on a bog-standard winXPSP2 box:
> >
> > * Install Squeak3.9-final-7067
> > * Install squeak-dev-72-2
> > * Launch squeak-dev-72-2.image
> > * World menu -> old desktop menu -> open ... -> SqueakMap Package Loader
> > * Select 15-Puzzle (-> 1.1)
> > * Menu -> first two items are "install" and "email package maintainers"
> > * Latter produces the "gaelli@" email address I'm copying this to
> > * Former produces "error occurred during install". Puzzle appears anyway
> > * Scramble and unscramble puzzle works normally
> > * World menu -> old desktop menu -> previous project returns to main
> >   world
> > * There a debugger can be seen. Bug report below. Upshot: seems a
> >   Player56 instance's scripts ivar is ending up an integer instead of an
> >   IdentityDictionary.
> > * Open a system browser and find some method. Pick senders of. Pick a
> >   method. Witness "primitive failed" debugger.
> > * Cause is a corrupt CompiledMethod object; senders grovels over all
> >   compiled methods in the system. This particular CompiledMethod object
> >   is for Player57's setEmptyCell: method.
> > * Yes -- that would be *your* Player57 class, Gaelli. :)
> > * To recover normal behavior, unloading the "1415 Puzzle" world seems
> >   called-for. X the window and get another attempt to invoke an
> >   IdentityDictionary method on a SmallInteger.
> > * Do a little digging and discover that Player56 can have its "scripts"
> >   ivar reset with jettisonScripts
> > * Open an inspector on the Player56 instance causing all the trouble and
> >   eval "self jettisonScripts"
> > * The icing on the cake: clicking the "1415 Puzzle" world window to try
> >   again to close it now crashes the VM(!).
> >
> > At least 4 separate bugs here.
> > * In 15-Puzzle 1.1: package install/startup constructs a Player56 with
> >   an integer in place of an IdentityDictionary in "scripts" ivar (ivar
> >   defined in superclass Player).
> > * Somehow, this causes a corrupt CompiledMethod for
> >   Player57>>setEmptyCell: to exist. Curiously, a normal version coexists
> >   with it! I suspect this is a VM error involving a dangling pointer.
> >   This may in turn indicate a Slang-to-C translator error.
> > * In VM, something that causes a crash. It is probably the same or
> >   another dangling pointer.
> > * In system tools: a single corrupt CompiledMethod makes "senders of"
> >   functionality useless. No failover. ("Proceed" causes the same corrupt
> >   method to keep popping up errors, apparently in an infinite loop.)
> >   In the particular case caused by the 15 puzzle, the CompiledMethod
> >   ends up with a "numLiterals" of zero (the proximate cause of the
> >   primitive failure) and a class that is an integer instead of a Class,
> >   FWIW. In any event, the system tools should provide some ability to
> >   recover, perhaps by ignoring or logging corrupt methods.
> >
> > 15 puzzle bug (generated bug report for the error during install):
> >
> > 10 January 2007 2:52:02 am
> >
> > VM: Win32 - a SmalltalkImage
> > Image: Squeak3.9 [latest update: #7067]
> >
> > SecurityManager state:
> > Restricted: false
> > FileAccess: true
> > SocketAccess: true
> > Working Dir C:\squeak
> > Trusted Dir C:\squeak\HP_Administrator
> > Untrusted Dir C:\My Squeak\HP_Administrator
> >
> > SmallInteger(Object)>>doesNotUnderstand: #removeKey:ifAbsent:
> >     Receiver: 89276551
> >     Arguments and temporary variables:
> >         aMessage:     removeKey: nil ifAbsent: [] in Player56
> > class(Player class)>>cleanseS...etc...
> >     Receiver's instance variables:
> > 89276551
> >
> > Player56 class(Player class)>>cleanseScriptsOfNilKeys
> >     Receiver: Player56
> >     Arguments and temporary variables:
> >
> >     Receiver's instance variables:
> >         superclass:     Player
> >         methodDict:     a MethodDictionary(#moveNumber->a CompiledMethod
> > (1619) )
> >         format:     136
> >         instanceVariables:     nil
> >         organization:     ('scripts' moveNumber)
> >
> >         subclasses:     nil
> >         name:     #Player56
> >         classPool:     nil
> >         sharedPools:     nil
> >         environment:     a SystemDictionary(lots of globals)
> >         category:     #UserObjects
> >         traitComposition:     an IdentityDictionary(#moveNumber->A
> > UniclassScript - selecto...etc...
> >         localSelectors:     an IdentityDictionary()
> >         scripts:     <<error during printing>>
> >
> > Player56 class(Player class)>>scripts
> >     Receiver: Player56
> >     Arguments and temporary variables:
> >
> >     Receiver's instance variables:
> >         superclass:     Player
> >         methodDict:     a MethodDictionary(#moveNumber->a CompiledMethod
> > (1619) )
> >         format:     136
> >         instanceVariables:     nil
> >         organization:     ('scripts' moveNumber)
> >
> >         subclasses:     nil
> >         name:     #Player56
> >         classPool:     nil
> >         sharedPools:     nil
> >         environment:     a SystemDictionary(lots of globals)
> >         category:     #UserObjects
> >         traitComposition:     an IdentityDictionary(#moveNumber->A
> > UniclassScript - selecto...etc...
> >         localSelectors:     an IdentityDictionary()
> >         scripts:     <<error during printing>>
> >
> > Player56(Player)>>methodInterfacesForScriptsCategoryIn:
> >     Receiver: a Player56 (3795) named Cell16
> >     Arguments and temporary variables:
> >         aVocabulary:     an EToyVocabulary named "eToy"
> >         myScripts:     nil
> >         us:     nil
> >     Receiver's instance variables:
> >         dependents:     nil
> >         costume:     a PasteUpMorph<Cell16>(2009)
> >         costumes:     nil
> >
> >
> > --- The full stack ---
> > SmallInteger(Object)>>doesNotUnderstand: #removeKey:ifAbsent:
> > Player56 class(Player class)>>cleanseScriptsOfNilKeys
> > Player56 class(Player class)>>scripts
> > Player56(Player)>>methodInterfacesForScriptsCategoryIn:
> >  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> > Player56(Object)>>methodInterfacesForCategory:inVocabulary:limitClass:
> > Player56(Object)>>tilePhrasesForCategory:inViewer:
> > CategoryViewer>>categoryWording:
> > CategoryViewer>>chosenCategorySymbol:
> > CategoryViewer>>chooseCategoryWhoseTranslatedWordingIs:
> > CategoryViewer>>initializeFor:categoryChoice:
> > StandardViewer>>categoryViewerFor:
> > StandardViewer>>addCategoryViewerFor:atEnd:
> > StandardViewer>>addCategoryViewerFor:
> > StandardViewer>>addCategoryViewer
> > StandardViewer>>initializeFor:barHeight:includeDismissButton:showCategori
> >es:
> >
> > StandardViewer>>initializeFor:barHeight:includeDismissButton:
> > StandardViewer>>initializeFor:barHeight:
> > Presenter>>viewMorph:
> > ViewerFlapTab>>unhibernate
> > ViewerFlapTab(FlapTab)>>adaptToWorld
> > [] in PasteUpMorph>>installFlaps {[:aFlapTab | aFlapTab adaptToWorld]}
> > OrderedCollection>>do:
> > PasteUpMorph>>installFlaps
> > PasteUpMorph>>install
> > Project>>enter:revert:saveForRevert:
> > Project>>enter
> > ProjectEntryNotification>>defaultAction
> > UndefinedObject>>handleSignal:
> > MethodContext(ContextPart)>>handleSignal:
> > MethodContext(ContextPart)>>handleSignal:
> > MethodContext(ContextPart)>>handleSignal:
> > MethodContext(ContextPart)>>handleSignal:
> > MethodContext(ContextPart)>>handleSignal:
> > ProjectEntryNotification(Exception)>>signal
> > ProjectEntryNotification(Exception)>>signal:
> > ProjectEntryNotification class>>signal:
> > ProjectLoading class>>openName:stream:fromDirectory:withProjectView:
> > [] in ProjectLoading class>>openFromDirectory:andFileName:
> > {[ProgressNotification signal: '1:foundMostRecent'.  fileAndDir := self
> > bestA...]}
> > BlockContext>>on:do:
> > [] in ComplexProgressIndicator>>withProgressDo: {[aBlock   on:
> > ProgressInitiationException   do: [:ex | ex     sendNotificati...]}
> > BlockContext>>on:do:
> > ComplexProgressIndicator>>withProgressDo:
> > ProjectLoading class>>openFromDirectory:andFileName:
> > [] in SMProjectInstaller>>install {[ProjectLoading openFromDirectory:
> > dir andFileName: fileName]}
> > ...etc...
> >
> >
> >
> > The VM crash log curiously indicates the VM version to be quite a bit
> > earlier than 3.9. Possible there's a mismatch between squeak-dev and
> > squeak? I downloaded the latest of both, after determining that
> > squeak-dev by itself was not a complete Squeak install. In fact, there's
> > an even more embarrassing fifth bug -- install just Squeak 3.9 7067
> > directly from the zip to any directory, drag the 7067 image into the
> > executable, click Workspace, and click "SMLoader open" in Workspace --
> > guess what? SmallInteger doesNotUnderstand: #numbers ... is there a
> > pattern here? Everything seems to boil down to SmallIntegers in places
> > where they don't belong. I'm starting to suspect that the system is
> > mistaking object pointers for integers and integers for object pointers
> > here and there. That would explain everything, including the VM crashes.
> > It would also betray a serious lack of testing and polish, unless it's a
> > weird system-dependent bug, but Squeak should be well tested on x86
> > boxen.
> >
> > FWIW, system specs are:
> > CPU: AMD64 dual-core XP2000
> > OS: Windows XP MCE, 32-bit, SP2
> > Video: eVGA -> nVidia GeForce GS6800
> > Sound: some generic POS, not actually exercised in the occurring of
> > these crashes
> > Memory: about 3/4 of 1GB in use and 1/4 free according to Task Manager
> > Disk: about 2/5 of 250GB free
> >
> > Version of Squeak downloaded was Win32 (I didn't see a win64 one anyway,
> > not that it would likely have worked).
> >
> > Log from an instance of the VM crash:
> >
> > ---------------------------------------------------------------------
> > Wed Jan 10 02:38:50 2007
> >
> > Exception code: C0000005
> > Exception addr: 00412165
> > Access violation (read access) at 054DFFC8
> > EAX:054DFFC8    EBX:0267441C    ECX:026795C4    EDX:00000000
> > ESI:005203F0    EDI:018DED7C    EBP:0006FC50    ESP:0006FC1C
> > EIP:00412165    EFL:00010212
> > FP Control: FFFF037F
> > FP Status:  FFFF4020
> > FP Tag:     FFFFFFFF
> > VM Version: Squeak 3.7.1 (release) from Sep 23 2004
> > Compiler: gcc 2.95.2 19991024 (release)
> >
> > Current byte code: 209
> > Primitive index: 77
> >
> > Loaded plugins:
> >     DSAPrims 23 September 2004 (i)
> >     ZipPlugin 23 September 2004 (i)
> >     SocketPlugin 23 September 2004 (i)
> >     LargeIntegers v1.3 23 September 2004 (i)
> >     Matrix2x3Plugin 23 September 2004 (i)
> >     FloatArrayPlugin 23 September 2004 (i)
> >     B2DPlugin 23 September 2004 (i)
> >     BitBltPlugin 23 September 2004 (i)
> >     SecurityPlugin 23 September 2004 (i)
> >     FilePlugin 23 September 2004 (i)
> >     MiscPrimitivePlugin 23 September 2004 (i)
> >
> >
> > Stack dump:
> >
> > 53568028 Behavior>allInstancesDo:
> > 53567116 Behavior>allSubInstancesDo:
> > 53567684 [] in Project>enter:revert:saveForRevert:
> > 53566956 Dictionary>at:ifPresentAndInMemory:
> > 48568348 Project>enter:revert:saveForRevert:
> > 48569980 ProjectViewMorph>enter
> > 48569888 ProjectViewMorph>mouseUp:
> > 48569756 Morph>handleMouseUp:
> > 48569664 MouseButtonEvent>sentTo:
> > 48569572 Morph>handleEvent:
> > 48569204 Morph>handleFocusEvent:
> > 48569296 [] in HandMorph>sendFocusEvent:to:clear:
> > 48569388 [] in PasteUpMorph>becomeActiveDuring:
> > 48569112 BlockContext>on:do:
> > 48569020 PasteUpMorph>becomeActiveDuring:
> > 48568836 HandMorph>sendFocusEvent:to:clear:
> > 48568744 HandMorph>sendEvent:focus:clear:
> > 48568652 HandMorph>sendMouseEvent:
> > 48568256 HandMorph>handleEvent:
> > 48567936 HandMorph>processEvents
> > 48568028 [] in WorldState>doOneCycleNowFor:
> > 48567844 SequenceableCollection>do:
> > 48567752 WorldState>handsDo:
> > 48567660 WorldState>doOneCycleNowFor:
> > 48567568 WorldState>doOneCycleFor:
> > 48567476 PasteUpMorph>doOneCycle
> > 48216052 [] in >spawnNewProcess
> > 48216236 [] in BlockContext>newProcess
> >
> > ---------------------------------------------------------------------
> > Wed Jan 10 03:02:09 2007
> >
> > Exception code: C0000005
> > Exception addr: 00427242
> > Access violation (read access) at 15797480
> > EAX:0ABCBA40    EBX:81BF3194    ECX:026C99E0    EDX:026CD798
> > ESI:00001378    EDI:00520580    EBP:00520580    ESP:0006FB64
> > EIP:00427242    EFL:00010202
> > FP Control: FFFF037F
> > FP Status:  FFFF0120
> > FP Tag:     FFFFFFFF
> > VM Version: Squeak 3.7.1 (release) from Sep 23 2004
> > Compiler: gcc 2.95.2 19991024 (release)
> >
> > Current byte code: 46
> > Primitive index: 71
> >
> > Loaded plugins:
> >     SocketPlugin 23 September 2004 (i)
> >     ZipPlugin 23 September 2004 (i)
> >     DSAPrims 23 September 2004 (i)
> >     LargeIntegers v1.3 23 September 2004 (i)
> >     Matrix2x3Plugin 23 September 2004 (i)
> >     FloatArrayPlugin 23 September 2004 (i)
> >     B2DPlugin 23 September 2004 (i)
> >     BitBltPlugin 23 September 2004 (i)
> >     SecurityPlugin 23 September 2004 (i)
> >     FilePlugin 23 September 2004 (i)
> >     MiscPrimitivePlugin 23 September 2004 (i)
> >
> >
> > Stack dump: