[squeak-dev] The Trunk: Graphics-fbs.209.mcz

Eliot Miranda eliot.miranda at gmail.com
Thu Apr 25 17:23:52 UTC 2013


On Wed, Apr 24, 2013 at 10:40 AM, Frank Shearar <frank.shearar at gmail.com>wrote:

> On 24 April 2013 17:50, Eliot Miranda <eliot.miranda at gmail.com> wrote:
> > 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:
>
> OK, that makes perfect sense. While I don't suggest we solve the
> halting problem, is there a way to make the symptom look less like
> it's Cog's fault?
>

Yes.  Two things.  One is to not attempt to produce a stack back-trace
while the system is GCing (but that's new infrastructure to set some flags
during GC, check them afterwards and perform the postponed activities;
gahhh).  The second is to (perhaps) add some infinite recursion checking
e.g. when memory grows.

>
> (The other image I sent you should _not_ have an infinite loop, even
> though it'll look like it (because it's about 6000 blocks nested
> through #compose:)).
>

What's the pointer to that.  I only found graphics-install-crash.zip in my
inbox

>
> frank
>
> >> 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
> >
> >
> >
>
>


-- 
best,
Eliot
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