Hi Frank,

On Wed, Apr 24, 2013 at 3:37 AM, Frank Shearar <frank.shearar at gmail.com>wrote:

> Hi Eliot,
>
> There's an image in your inbox. This crashes on my laptop (Ubuntu
> 10.10, 32 bit machine), but on my work machine (Ubuntu 10.10, 64 bit
> machine) just hangs forever.
>

This is an infinite recursion, since asGrafPort is needed to create a
notifier, and so provokes another attempt to open one:

0x178dffc8 s BitBlt class(Object)>doesNotUnderstand: asGrafPort
0x17b5de40 s FormCanvas>portClass
0x17b5ea64 s FormCanvas>setForm:
0x17b5efc8 s FormCanvas class>on:
0x17b5f4d0 s DisplayText>composeForm
0x17b5f97c s DisplayText>form
0x1784e2cc s DisplayText>displayOn:at:clippingBox:rule:fillColor:
0x1784e270 s DisplayText(DisplayObject)>displayOn:at:
0x17da03ec s ByteString(String)>displayOn:at:textColor:
0x17da0784 s ByteString(String)>displayOn:at:
0x17da0b78 s ByteString(String)>displayAt:
0x1784dd20 s MorphicProject(Object)>primitiveError:
0x1784dd7c s MorphicProject>handleFatalDrawingError:
0x1784d5f0 s [] in WorldState>displayWorldSafely:
0x1784d6a8 s BlockClosure>cull:cull:
0x1784d560 s [] in BlockClosure>ifError:
0x1784d64c s BlockClosure>cull:
0x1784d704 s [] in MethodContext(ContextPart)>handleSignal:
0x1784d760 s BlockClosure>ensure:
0x1784d4d8 s MethodContext(ContextPart)>handleSignal:
0x1784d3c4 s MessageNotUnderstood(Exception)>signal
0x1784d420 s BitBlt class(Object)>doesNotUnderstand: asGrafPort
0x1784d7bc s FormCanvas>portClass
0x1784d818 s FormCanvas>resetGrafPort
0x1784d874 s FormCanvas>copy
0x1784d8d0 s FormCanvas>copyOrigin:clipRect:
0x1784d92c s FormCanvas>copyClipRect:
0x1784d200 s [] in WorldState>drawWorld:submorphs:invalidAreasOn:
0x1784d1a4 s Rectangle>allAreasOutsideList:startingAt:do:
0x1784d988 s Rectangle>allAreasOutsideList:do:
0x1784d078 s [] in WorldState>drawWorld:submorphs:invalidAreasOn:
0x1784d9e4 s Array(SequenceableCollection)>do:
0x1784ced4 s WorldState>drawWorld:submorphs:invalidAreasOn:
0x1784da40 s [] in WorldState>displayWorld:submorphs:
0x1784da9c s FormCanvas>roundCornersOf:in:during:
0x1784daf8 s FormCanvas(Canvas)>roundCornersOf:during:
0x1784cdf4 s WorldState>displayWorld:submorphs:
0x1784ce70 s PasteUpMorph>privateOuterDisplayWorld
0x1784db54 s PasteUpMorph>displayWorld
0x1784dbb0 s [] in WorldState>displayWorldSafely:
0x1784d47c s BlockClosure>on:do:
0x1784cd74 s BlockClosure>ifError:
0x1784ccec s WorldState>displayWorldSafely:
0x1784cc3c s WorldState>doOneCycleNowFor:
0x1784dc0c s WorldState>doOneCycleFor:
0x1784dc68 s PasteUpMorph>doOneCycle
0x1784dcc4 s [] in Project class>spawnNewProcess
0x1784c424 s [] in BlockClosure>newProcess

>
> IIRC this is the same behaviour as the last image I sent you, with my
> parsing derivatives stuff triggering the overwrite.
>
> frank
>
> On 23 April 2013 18:20, Eliot Miranda <eliot.miranda at gmail.com> wrote:
> > Hi Frank,
> >
> >     I need to be able to reproduce this.  The error message means what it
> > says; some code in the VM (primitives usually) has written beyond the
> end of
> > an object, which, if it weren't happening to the last object in memory
> would
> > smash the following object, crashing the GC.  So when this happens please
> > attempt to create an image that reproduces the bug and then I can track
> down
> > the offending overwrite.
> >
> > The VM fills the nursery zone with a specific bit pattern (each 4-byte
> word
> > contains its address) and checks on allocation that the allocation
> pointer
> > is pointing at a word with the right contents.  If not, it aborts.  In
> this
> > case the effects are benign (because the overwrite is writing beyond the
> > allocation pointer where there are no objects).  But if whatever code
> > overwrote did so to an object in the middle of the heap a less easily
> > diagnosed crash would occur.
> >
> >
> > On Tue, Apr 23, 2013 at 2:34 AM, Frank Shearar <frank.shearar at gmail.com>
> > wrote:
> >>
> >> On 23 April 2013 09:50,  <commits at source.squeak.org> wrote:
> >> > Frank Shearar uploaded a new version of Graphics to project The Trunk:
> >> > http://source.squeak.org/trunk/Graphics-fbs.209.mcz
> >> >
> >> > ==================== Summary ====================
> >> >
> >> > Name: Graphics-fbs.209
> >> > Author: fbs
> >> > Time: 23 April 2013, 9:50:00.413 am
> >> > UUID: 4dd577f2-2a70-4e21-8efa-5847b3ad804c
> >> > Ancestors: Graphics-tpr.208
> >> >
> >> > #asGrafPort belongs in the Morphic package.
> >> >
> >> > =============== Diff against Graphics-tpr.208 ===============
> >> >
> >> > Item was removed:
> >> > - ----- Method: BitBlt class>>asGrafPort (in category 'instance
> >> > creation') -----
> >> > - asGrafPort
> >> > -       "Return the GrafPort associated with the receiver"
> >> > -       ^GrafPort!
> >>
> >> I don't see why, but this and its pair Morphic-fbs-648 seem to have
> >> triggered a nasty bug in Cog r.2714.
> >>
> >> To trigger it,
> >> * clone https://github.com/frankshearar/squeak-ci/
> >> * open the Squeak4.5.image therein, with a (Linux) Cog r.2714
> >> * update it.
> >>
> >> Everything proceeds fine until installing this update. On my weak
> >> little laptop things pause, and then I see the dreaded "(last object
> >> overwritten)" message. On my much more powerful work machine (also a
> >> Linux box) it just pauses. Squeak's burning a hole in the CPU, and
> >> updating is uninterruptable.
> >>
> >> On my work machine, upgrading using an Interpreter VM just leaves me
> >> hanging.
> >>
> >> <cog's output follows:>
> >> last object overwritten
> >>
> >> Squeak VM version: 4.0-2714 #1 Thu Apr  4 11:52:39 PDT 2013 gcc 4.1.2
> >> Built from: CoInterpreter VMMaker.oscog-eem.282 uuid:
> >> 6c2f2048-555b-4d37-a9eb-4d9252acf3b9 Apr  4 2013
> >> With: StackToRegisterMappingCogit VMMaker.oscog-eem.282 uuid:
> >> 6c2f2048-555b-4d37-a9eb-4d9252acf3b9 Apr  4 2013
> >> Revision: VM: r2714 http://www.squeakvm.org/svn/squeak/branches/Cog
> >> Plugins: r2545
> >> http://squeakvm.org/svn/squeak/trunk/platforms/Cross/plugins
> >> Build host: Linux mcqfes 2.6.18-128.el5 #1 SMP Wed Jan 21 10:44:23 EST
> >> 2009 i686 i686 i386 GNU/Linux
> >> plugin path: target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714
> >> [default:
> >>
> /home/frank/Documents/squeak-ci/target/cog.r2714/coglinux/lib/squeak/4.0-2714/]
> >>
> >>
> >> C stack backtrace:
> >> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak[0x805cca1]
> >>
> >>
> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak(error+0x19)[0x805cf89]
> >>
> >>
> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak(instantiateClassindexableSize+0xa9)[0x807a159]
> >> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak[0x807b21b]
> >> [0x77745451]
> >>
> >>
> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak(interpret+0x1eb)[0x808080b]
> >>
> >>
> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak(main+0x397)[0x805d367]
> >> /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6)[0x12abd6]
> >> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak[0x805ad61]
> >>
> >>
> >> Smalltalk stack dump:
> >> 0xbfe2ad38 M Bitmap class(Behavior)>new: 0x77b25270: a(n) Bitmap class
> >> 0xbfe2ad54 M Form>setExtent:depth: 0x7ff6e7a0: a(n) Form
> >> 0xbfe2ad74 M Form class>extent:depth: 0x77b27480: a(n) Form class
> >> 0xbfe2ada0 M DisplayText>composeForm 0x7ff6d8fc: a(n) DisplayText
> >> 0xbfe2adb8 M DisplayText>form 0x7ff6d8fc: a(n) DisplayText
> >> 0xbfe2add8 M DisplayText>displayOn:at:clippingBox:rule:fillColor:
> >> 0x7ff6d8fc: a(n) DisplayText
> >> 0xbfe2ae04 M DisplayText(DisplayObject)>displayOn:at: 0x7ff6d8fc: a(n)
> >> DisplayText
> >> 0xbfe2ae24 M ByteString(String)>displayOn:at:textColor: 0x7ff6d450:
> >> a(n) ByteString
> >> 0xbfe81ca0 M ByteString(String)>displayOn:at: 0x7ff6d450: a(n)
> ByteString
> >> 0xbfe81cc0 M ByteString(String)>displayAt: 0x7ff6d450: a(n) ByteString
> >> 0xbfe81cdc M Debugger class(Object)>primitiveError: 0x77dc864c: a(n)
> >> Debugger class
> >> 0xbfe81cfc M [] in Debugger
> >> class>morphicOpenOn:context:label:contents:fullView: 0x77dc864c: a(n)
> >> Debugger class
> >> 0xbfe81d18 M BlockClosure>cull: 0x7ff577ac: a(n) BlockClosure
> >> 0xbfe81d38 M [] in MethodContext(ContextPart)>handleSignal:
> >> 0x7ff6cc68: a(n) MethodContext
> >> 0xbfe81d58 M BlockClosure>ensure: 0x7ff6cd24: a(n) BlockClosure
> >> 0xbfe81d78 M MethodContext(ContextPart)>handleSignal: 0x7ff6cc68: a(n)
> >> MethodContext
> >> 0xbfe81d94 M MessageNotUnderstood(Exception)>signal 0x7ff6cad4: a(n)
> >> MessageNotUnderstood
> >> 0xbfe81db4 M BitBlt class(Object)>doesNotUnderstand: asGrafPort
> >> 0x77b22b48: a(n) BitBlt class
> >> 0xbfe81dd0 M FormCanvas>portClass 0x7ff5ca70: a(n) FormCanvas
> >> 0xbfe81de8 M FormCanvas>setForm: 0x7ff5ca70: a(n) FormCanvas
> >> 0xbfe81e04 M FormCanvas class>extent:depth: 0x77b2d750: a(n) FormCanvas
> >> class
> >> 0xbfe81e28 M RectangleMorph(Morph)>imageForm:forRectangle: 0x7ff5c550:
> >> a(n) RectangleMorph
> >> 0xbfe39d14 M RectangleMorph(Morph)>imageFormForRectangle: 0x7ff5c550:
> >> a(n) RectangleMorph
> >> 0xbfe39d30 M RectangleMorph(Morph)>imageForm 0x7ff5c550: a(n)
> >> RectangleMorph
> >> 0xbfe39d5c M ScrollBar class>createArrowOfDirection:size:color:
> >> 0x77b29268: a(n) ScrollBar class
> >> 0xbfe39d80 M [] in ScrollBar class>createArrowImagesCache 0x77b29268:
> >> a(n) ScrollBar class
> >> 0xbfe39db0 M LRUCache>at: 0x785bcddc: a(n) LRUCache
> >> 0xbfe39dcc M ScrollBar class>arrowOfDirection:size:color: 0x77b29268:
> >> a(n) ScrollBar class
> >> 0xbfe39df0 M ScrollBar>upImage 0x7ff5b408: a(n) ScrollBar
> >> 0xbfe39e10 M ScrollBar>updateUpButtonImage 0x7ff5b408: a(n) ScrollBar
> >> 0xbfe39e2c M ScrollBar>sliderColor: 0x7ff5b408: a(n) ScrollBar
> >> 0xbfe44cf8 I ScrollBar>adoptPaneColor: 0x7ff5b408: a(n) ScrollBar
> >> 0xbfe44d18 M [] in PluggableListMorphPlus(Morph)>adoptPaneColor:
> >> 0x7ff5ab30: a(n) PluggableListMorphPlus
> >> 0xbfe44d3c M Array(SequenceableCollection)>do: 0x7ff5bea4: a(n) Array
> >> 0xbfe44d58 M PluggableListMorphPlus(Morph)>submorphsDo: 0x7ff5ab30:
> >> a(n) PluggableListMorphPlus
> >> 0xbfe44d74 M PluggableListMorphPlus(Morph)>adoptPaneColor: 0x7ff5ab30:
> >> a(n) PluggableListMorphPlus
> >> 0xbfe44d90 M PluggableListMorphPlus(ScrollPane)>adoptPaneColor:
> >> 0x7ff5ab30: a(n) PluggableListMorphPlus
> >> 0xbfe44dc0 M PluggableSystemWindow(SystemWindow)>addMorph:fullFrame:
> >> 0x7ff5803c: a(n) PluggableSystemWindow
> >> 0xbfe44de0 M PluggableSystemWindow>addPaneMorph: 0x7ff5803c: a(n)
> >> PluggableSystemWindow
> >> 0xbfe44dfc M MorphicToolBuilder>add:to: 0x7ff57880: a(n)
> >> MorphicToolBuilder
> >> 0xbfe44e2c M MorphicToolBuilder>buildPluggableList: 0x7ff57880: a(n)
> >> MorphicToolBuilder
> >> 0xbfe6ccec M PluggableListSpec>buildWith: 0x7ff57b74: a(n)
> >> PluggableListSpec
> >> 0xbfe6cd08 M [] in MorphicToolBuilder(ToolBuilder)>buildAll:in:
> >> 0x7ff57880: a(n)
> >>  MorphicToolBuilder
> >> 0xbfe6cd28 M OrderedCollection>do: 0x7ff578dc: a(n) OrderedCollection
> >> 0xbfe6cd48 M MorphicToolBuilder(ToolBuilder)>buildAll:in: 0x7ff57880:
> >> a(n) MorphicToolBuilder
> >> 0xbfe6cd74 M MorphicToolBuilder>buildPluggableWindow: 0x7ff57880: a(n)
> >> MorphicToolBuilder
> >> 0xbfe6cd90 M PluggableWindowSpec>buildWith: 0x7ff57898: a(n)
> >> PluggableWindowSpec
> >> 0xbfe6cdb4 I MorphicToolBuilder(ToolBuilder)>build: 0x7ff57880: a(n)
> >> MorphicToolBuilder
> >> 0xbfe6cddc I MorphicToolBuilder>open: 0x7ff57880: a(n)
> MorphicToolBuilder
> >> 0xbfe6ce00 I MorphicToolBuilder(ToolBuilder)>openDebugger: 0x7ff57880:
> >> a(n) MorphicToolBuilder
> >> 0xbfe6ce28 M Debugger>openNotifierContents:label: 0x7ff577c4: a(n)
> >> Debugger
> >> 0xbfea4d08 M [] in Debugger
> >> class>morphicOpenOn:context:label:contents:fullView: 0x77dc864c: a(n)
> >> Debugger class
> >> 0xbfea4d24 M BlockClosure>on:do: 0x7ff5777c: a(n) BlockClosure
> >> 0xbfea4d60 M [] in Debugger
> >> class>morphicOpenOn:context:label:contents:fullView: 0x77dc864c: a(n)
> >> Debugger class
> >> 0xbfea4d88 M WorldState>runStepMethodsIn: 0x77834af8: a(n) WorldState
> >> 0xbfea4da4 M PasteUpMorph>runStepMethods 0x77c6a5ec: a(n) PasteUpMorph
> >> 0xbfea4dc0 M WorldState>doOneCycleNowFor: 0x77834af8: a(n) WorldState
> >> 0xbfea4ddc M WorldState>doOneCycleFor: 0x77834af8: a(n) WorldState
> >> 0xbfea4df8 M PasteUpMorph>doOneCycle 0x77c6a5ec: a(n) PasteUpMorph
> >> 0xbfea4e10 M [] in Project class>spawnNewProcess 0x77c54960: a(n)
> Project
> >> class
> >> 0xbfea4e30 I [] in BlockClosure>newProcess 0x7ff557f4: a(n) BlockClosure
> >>
> >> Most recent primitives
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> at:put:
> >> @
> >> @
> >> basicNew
> >> new:
> >> at:put:
> >> basicNew
> >> shallowCopy
> >> shallowCopy
> >> at:put:
> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:
> >> new:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:
> >> new:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:
> >> new:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:
> >> new:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:
> >> new:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:
> >> new:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:
> >> new:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> at:put:
> >> @
> >> @
> >> basicNew
> >> new:
> >> at:put:
> >> basicNew
> >> shallowCopy
> >> shallowCopy
> >> at:put:
> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:
> >> new:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:
> >> new:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:
> >> new:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:
> >> new:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:
> >> new:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:
> >> new:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> at:put:
> >> perform:
> >> at:put:
> >> species
> >> new:
> >> replaceFrom:to:with:startingAt:
> >> @
> >> @
> >> basicNew
> >> @
> >> @
> >> @
> >> @
> >> @
> >> @
> >> perform:with:
> >> @
> >> @
> >> species
> >> species
> >> at:put:
> >> @
> >> basicNew
> >> basicNew:
> >>
> >> stack page bytes 4096 available headroom 3300 minimum unused headroom
> 2228
> >>
> >> (last object overwritten)
> >>
> >> frank
> >>
> >
> >
> >
> > --
> > best,
> > Eliot
> >
> >
> >
>
>


-- 
best,
Eliot
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