[squeak-dev] The Trunk: Graphics-fbs.209.mczFrank Shearar frank.shearar at gmail.comWed Apr 24 17:40:38 UTC 2013
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? (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:)). 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 > > >
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