<br><br><div class="gmail_quote">On Wed, Apr 24, 2013 at 10:40 AM, Frank Shearar <span dir="ltr"><<a href="mailto:frank.shearar@gmail.com" target="_blank">frank.shearar@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">On 24 April 2013 17:50, Eliot Miranda <<a href="mailto:eliot.miranda@gmail.com">eliot.miranda@gmail.com</a>> wrote:<br>
> Hi Frank,<br>
><br>
</div><div class="im">> On Wed, Apr 24, 2013 at 3:37 AM, Frank Shearar <<a href="mailto:frank.shearar@gmail.com">frank.shearar@gmail.com</a>><br>
> wrote:<br>
>><br>
>> Hi Eliot,<br>
>><br>
>> There's an image in your inbox. This crashes on my laptop (Ubuntu<br>
>> 10.10, 32 bit machine), but on my work machine (Ubuntu 10.10, 64 bit<br>
>> machine) just hangs forever.<br>
><br>
><br>
> This is an infinite recursion, since asGrafPort is needed to create a<br>
> notifier, and so provokes another attempt to open one:<br>
<br>
</div>OK, that makes perfect sense. While I don't suggest we solve the<br>
halting problem, is there a way to make the symptom look less like<br>
it's Cog's fault?<br></blockquote><div><br></div><div>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.</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
(The other image I sent you should _not_ have an infinite loop, even<br>
though it'll look like it (because it's about 6000 blocks nested<br>
through #compose:)).<br></blockquote><div><br></div><div>What's the pointer to that. I only found graphics-install-crash.zip in my inbox</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<span class="HOEnZb"><font color="#888888"><br>
frank<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
>> IIRC this is the same behaviour as the last image I sent you, with my<br>
>> parsing derivatives stuff triggering the overwrite.<br>
>><br>
>> frank<br>
>><br>
>> On 23 April 2013 18:20, Eliot Miranda <<a href="mailto:eliot.miranda@gmail.com">eliot.miranda@gmail.com</a>> wrote:<br>
>> > Hi Frank,<br>
>> ><br>
>> > I need to be able to reproduce this. The error message means what<br>
>> > it<br>
>> > says; some code in the VM (primitives usually) has written beyond the<br>
>> > end of<br>
>> > an object, which, if it weren't happening to the last object in memory<br>
>> > would<br>
>> > smash the following object, crashing the GC. So when this happens<br>
>> > please<br>
>> > attempt to create an image that reproduces the bug and then I can track<br>
>> > down<br>
>> > the offending overwrite.<br>
>> ><br>
>> > The VM fills the nursery zone with a specific bit pattern (each 4-byte<br>
>> > word<br>
>> > contains its address) and checks on allocation that the allocation<br>
>> > pointer<br>
>> > is pointing at a word with the right contents. If not, it aborts. In<br>
>> > this<br>
>> > case the effects are benign (because the overwrite is writing beyond the<br>
>> > allocation pointer where there are no objects). But if whatever code<br>
>> > overwrote did so to an object in the middle of the heap a less easily<br>
>> > diagnosed crash would occur.<br>
>> ><br>
>> ><br>
>> > On Tue, Apr 23, 2013 at 2:34 AM, Frank Shearar <<a href="mailto:frank.shearar@gmail.com">frank.shearar@gmail.com</a>><br>
>> > wrote:<br>
>> >><br>
>> >> On 23 April 2013 09:50, <<a href="mailto:commits@source.squeak.org">commits@source.squeak.org</a>> wrote:<br>
>> >> > Frank Shearar uploaded a new version of Graphics to project The<br>
>> >> > Trunk:<br>
>> >> > <a href="http://source.squeak.org/trunk/Graphics-fbs.209.mcz" target="_blank">http://source.squeak.org/trunk/Graphics-fbs.209.mcz</a><br>
>> >> ><br>
>> >> > ==================== Summary ====================<br>
>> >> ><br>
>> >> > Name: Graphics-fbs.209<br>
>> >> > Author: fbs<br>
>> >> > Time: 23 April 2013, 9:50:00.413 am<br>
>> >> > UUID: 4dd577f2-2a70-4e21-8efa-5847b3ad804c<br>
>> >> > Ancestors: Graphics-tpr.208<br>
>> >> ><br>
>> >> > #asGrafPort belongs in the Morphic package.<br>
>> >> ><br>
>> >> > =============== Diff against Graphics-tpr.208 ===============<br>
>> >> ><br>
>> >> > Item was removed:<br>
>> >> > - ----- Method: BitBlt class>>asGrafPort (in category 'instance<br>
>> >> > creation') -----<br>
>> >> > - asGrafPort<br>
>> >> > - "Return the GrafPort associated with the receiver"<br>
>> >> > - ^GrafPort!<br>
>> >><br>
>> >> I don't see why, but this and its pair Morphic-fbs-648 seem to have<br>
>> >> triggered a nasty bug in Cog r.2714.<br>
>> >><br>
>> >> To trigger it,<br>
>> >> * clone <a href="https://github.com/frankshearar/squeak-ci/" target="_blank">https://github.com/frankshearar/squeak-ci/</a><br>
>> >> * open the Squeak4.5.image therein, with a (Linux) Cog r.2714<br>
>> >> * update it.<br>
>> >><br>
>> >> Everything proceeds fine until installing this update. On my weak<br>
>> >> little laptop things pause, and then I see the dreaded "(last object<br>
>> >> overwritten)" message. On my much more powerful work machine (also a<br>
>> >> Linux box) it just pauses. Squeak's burning a hole in the CPU, and<br>
>> >> updating is uninterruptable.<br>
>> >><br>
>> >> On my work machine, upgrading using an Interpreter VM just leaves me<br>
>> >> hanging.<br>
>> >><br>
>> >> <cog's output follows:><br>
>> >> last object overwritten<br>
>> >><br>
>> >> Squeak VM version: 4.0-2714 #1 Thu Apr 4 11:52:39 PDT 2013 gcc 4.1.2<br>
>> >> Built from: CoInterpreter VMMaker.oscog-eem.282 uuid:<br>
>> >> 6c2f2048-555b-4d37-a9eb-4d9252acf3b9 Apr 4 2013<br>
>> >> With: StackToRegisterMappingCogit VMMaker.oscog-eem.282 uuid:<br>
>> >> 6c2f2048-555b-4d37-a9eb-4d9252acf3b9 Apr 4 2013<br>
>> >> Revision: VM: r2714 <a href="http://www.squeakvm.org/svn/squeak/branches/Cog" target="_blank">http://www.squeakvm.org/svn/squeak/branches/Cog</a><br>
>> >> Plugins: r2545<br>
>> >> <a href="http://squeakvm.org/svn/squeak/trunk/platforms/Cross/plugins" target="_blank">http://squeakvm.org/svn/squeak/trunk/platforms/Cross/plugins</a><br>
>> >> Build host: Linux mcqfes 2.6.18-128.el5 #1 SMP Wed Jan 21 10:44:23 EST<br>
>> >> 2009 i686 i686 i386 GNU/Linux<br>
>> >> plugin path: target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714<br>
>> >> [default:<br>
>> >><br>
>> >> /home/frank/Documents/squeak-ci/target/cog.r2714/coglinux/lib/squeak/4.0-2714/]<br>
>> >><br>
>> >><br>
>> >> C stack backtrace:<br>
>> >> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak[0x805cca1]<br>
>> >><br>
>> >><br>
>> >> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak(error+0x19)[0x805cf89]<br>
>> >><br>
>> >><br>
>> >> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak(instantiateClassindexableSize+0xa9)[0x807a159]<br>
>> >> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak[0x807b21b]<br>
>> >> [0x77745451]<br>
>> >><br>
>> >><br>
>> >> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak(interpret+0x1eb)[0x808080b]<br>
>> >><br>
>> >><br>
>> >> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak(main+0x397)[0x805d367]<br>
>> >> /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6)[0x12abd6]<br>
>> >> target/cog.r2714/coglinux/bin/../lib/squeak/4.0-2714/squeak[0x805ad61]<br>
>> >><br>
>> >><br>
>> >> Smalltalk stack dump:<br>
>> >> 0xbfe2ad38 M Bitmap class(Behavior)>new: 0x77b25270: a(n) Bitmap class<br>
>> >> 0xbfe2ad54 M Form>setExtent:depth: 0x7ff6e7a0: a(n) Form<br>
>> >> 0xbfe2ad74 M Form class>extent:depth: 0x77b27480: a(n) Form class<br>
>> >> 0xbfe2ada0 M DisplayText>composeForm 0x7ff6d8fc: a(n) DisplayText<br>
>> >> 0xbfe2adb8 M DisplayText>form 0x7ff6d8fc: a(n) DisplayText<br>
>> >> 0xbfe2add8 M DisplayText>displayOn:at:clippingBox:rule:fillColor:<br>
>> >> 0x7ff6d8fc: a(n) DisplayText<br>
>> >> 0xbfe2ae04 M DisplayText(DisplayObject)>displayOn:at: 0x7ff6d8fc: a(n)<br>
>> >> DisplayText<br>
>> >> 0xbfe2ae24 M ByteString(String)>displayOn:at:textColor: 0x7ff6d450:<br>
>> >> a(n) ByteString<br>
>> >> 0xbfe81ca0 M ByteString(String)>displayOn:at: 0x7ff6d450: a(n)<br>
>> >> ByteString<br>
>> >> 0xbfe81cc0 M ByteString(String)>displayAt: 0x7ff6d450: a(n) ByteString<br>
>> >> 0xbfe81cdc M Debugger class(Object)>primitiveError: 0x77dc864c: a(n)<br>
>> >> Debugger class<br>
>> >> 0xbfe81cfc M [] in Debugger<br>
>> >> class>morphicOpenOn:context:label:contents:fullView: 0x77dc864c: a(n)<br>
>> >> Debugger class<br>
>> >> 0xbfe81d18 M BlockClosure>cull: 0x7ff577ac: a(n) BlockClosure<br>
>> >> 0xbfe81d38 M [] in MethodContext(ContextPart)>handleSignal:<br>
>> >> 0x7ff6cc68: a(n) MethodContext<br>
>> >> 0xbfe81d58 M BlockClosure>ensure: 0x7ff6cd24: a(n) BlockClosure<br>
>> >> 0xbfe81d78 M MethodContext(ContextPart)>handleSignal: 0x7ff6cc68: a(n)<br>
>> >> MethodContext<br>
>> >> 0xbfe81d94 M MessageNotUnderstood(Exception)>signal 0x7ff6cad4: a(n)<br>
>> >> MessageNotUnderstood<br>
>> >> 0xbfe81db4 M BitBlt class(Object)>doesNotUnderstand: asGrafPort<br>
>> >> 0x77b22b48: a(n) BitBlt class<br>
>> >> 0xbfe81dd0 M FormCanvas>portClass 0x7ff5ca70: a(n) FormCanvas<br>
>> >> 0xbfe81de8 M FormCanvas>setForm: 0x7ff5ca70: a(n) FormCanvas<br>
>> >> 0xbfe81e04 M FormCanvas class>extent:depth: 0x77b2d750: a(n) FormCanvas<br>
>> >> class<br>
>> >> 0xbfe81e28 M RectangleMorph(Morph)>imageForm:forRectangle: 0x7ff5c550:<br>
>> >> a(n) RectangleMorph<br>
>> >> 0xbfe39d14 M RectangleMorph(Morph)>imageFormForRectangle: 0x7ff5c550:<br>
>> >> a(n) RectangleMorph<br>
>> >> 0xbfe39d30 M RectangleMorph(Morph)>imageForm 0x7ff5c550: a(n)<br>
>> >> RectangleMorph<br>
>> >> 0xbfe39d5c M ScrollBar class>createArrowOfDirection:size:color:<br>
>> >> 0x77b29268: a(n) ScrollBar class<br>
>> >> 0xbfe39d80 M [] in ScrollBar class>createArrowImagesCache 0x77b29268:<br>
>> >> a(n) ScrollBar class<br>
>> >> 0xbfe39db0 M LRUCache>at: 0x785bcddc: a(n) LRUCache<br>
>> >> 0xbfe39dcc M ScrollBar class>arrowOfDirection:size:color: 0x77b29268:<br>
>> >> a(n) ScrollBar class<br>
>> >> 0xbfe39df0 M ScrollBar>upImage 0x7ff5b408: a(n) ScrollBar<br>
>> >> 0xbfe39e10 M ScrollBar>updateUpButtonImage 0x7ff5b408: a(n) ScrollBar<br>
>> >> 0xbfe39e2c M ScrollBar>sliderColor: 0x7ff5b408: a(n) ScrollBar<br>
>> >> 0xbfe44cf8 I ScrollBar>adoptPaneColor: 0x7ff5b408: a(n) ScrollBar<br>
>> >> 0xbfe44d18 M [] in PluggableListMorphPlus(Morph)>adoptPaneColor:<br>
>> >> 0x7ff5ab30: a(n) PluggableListMorphPlus<br>
>> >> 0xbfe44d3c M Array(SequenceableCollection)>do: 0x7ff5bea4: a(n) Array<br>
>> >> 0xbfe44d58 M PluggableListMorphPlus(Morph)>submorphsDo: 0x7ff5ab30:<br>
>> >> a(n) PluggableListMorphPlus<br>
>> >> 0xbfe44d74 M PluggableListMorphPlus(Morph)>adoptPaneColor: 0x7ff5ab30:<br>
>> >> a(n) PluggableListMorphPlus<br>
>> >> 0xbfe44d90 M PluggableListMorphPlus(ScrollPane)>adoptPaneColor:<br>
>> >> 0x7ff5ab30: a(n) PluggableListMorphPlus<br>
>> >> 0xbfe44dc0 M PluggableSystemWindow(SystemWindow)>addMorph:fullFrame:<br>
>> >> 0x7ff5803c: a(n) PluggableSystemWindow<br>
>> >> 0xbfe44de0 M PluggableSystemWindow>addPaneMorph: 0x7ff5803c: a(n)<br>
>> >> PluggableSystemWindow<br>
>> >> 0xbfe44dfc M MorphicToolBuilder>add:to: 0x7ff57880: a(n)<br>
>> >> MorphicToolBuilder<br>
>> >> 0xbfe44e2c M MorphicToolBuilder>buildPluggableList: 0x7ff57880: a(n)<br>
>> >> MorphicToolBuilder<br>
>> >> 0xbfe6ccec M PluggableListSpec>buildWith: 0x7ff57b74: a(n)<br>
>> >> PluggableListSpec<br>
>> >> 0xbfe6cd08 M [] in MorphicToolBuilder(ToolBuilder)>buildAll:in:<br>
>> >> 0x7ff57880: a(n)<br>
>> >> MorphicToolBuilder<br>
>> >> 0xbfe6cd28 M OrderedCollection>do: 0x7ff578dc: a(n) OrderedCollection<br>
>> >> 0xbfe6cd48 M MorphicToolBuilder(ToolBuilder)>buildAll:in: 0x7ff57880:<br>
>> >> a(n) MorphicToolBuilder<br>
>> >> 0xbfe6cd74 M MorphicToolBuilder>buildPluggableWindow: 0x7ff57880: a(n)<br>
>> >> MorphicToolBuilder<br>
>> >> 0xbfe6cd90 M PluggableWindowSpec>buildWith: 0x7ff57898: a(n)<br>
>> >> PluggableWindowSpec<br>
>> >> 0xbfe6cdb4 I MorphicToolBuilder(ToolBuilder)>build: 0x7ff57880: a(n)<br>
>> >> MorphicToolBuilder<br>
>> >> 0xbfe6cddc I MorphicToolBuilder>open: 0x7ff57880: a(n)<br>
>> >> MorphicToolBuilder<br>
>> >> 0xbfe6ce00 I MorphicToolBuilder(ToolBuilder)>openDebugger: 0x7ff57880:<br>
>> >> a(n) MorphicToolBuilder<br>
>> >> 0xbfe6ce28 M Debugger>openNotifierContents:label: 0x7ff577c4: a(n)<br>
>> >> Debugger<br>
>> >> 0xbfea4d08 M [] in Debugger<br>
>> >> class>morphicOpenOn:context:label:contents:fullView: 0x77dc864c: a(n)<br>
>> >> Debugger class<br>
>> >> 0xbfea4d24 M BlockClosure>on:do: 0x7ff5777c: a(n) BlockClosure<br>
>> >> 0xbfea4d60 M [] in Debugger<br>
>> >> class>morphicOpenOn:context:label:contents:fullView: 0x77dc864c: a(n)<br>
>> >> Debugger class<br>
>> >> 0xbfea4d88 M WorldState>runStepMethodsIn: 0x77834af8: a(n) WorldState<br>
>> >> 0xbfea4da4 M PasteUpMorph>runStepMethods 0x77c6a5ec: a(n) PasteUpMorph<br>
>> >> 0xbfea4dc0 M WorldState>doOneCycleNowFor: 0x77834af8: a(n) WorldState<br>
>> >> 0xbfea4ddc M WorldState>doOneCycleFor: 0x77834af8: a(n) WorldState<br>
>> >> 0xbfea4df8 M PasteUpMorph>doOneCycle 0x77c6a5ec: a(n) PasteUpMorph<br>
>> >> 0xbfea4e10 M [] in Project class>spawnNewProcess 0x77c54960: a(n)<br>
>> >> Project<br>
>> >> class<br>
>> >> 0xbfea4e30 I [] in BlockClosure>newProcess 0x7ff557f4: a(n)<br>
>> >> BlockClosure<br>
>> >><br>
>> >> Most recent primitives<br>
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>> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:<br>
>> >> new:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> perform:<br>
>> >> basicScanCharactersFrom:to:in:rightX:stopConditions:kern:<br>
>> >> new:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> at:put:<br>
>> >> perform:<br>
>> >> at:put:<br>
>> >> species<br>
>> >> new:<br>
>> >> replaceFrom:to:with:startingAt:<br>
>> >> @<br>
>> >> @<br>
>> >> basicNew<br>
>> >> @<br>
>> >> @<br>
>> >> @<br>
>> >> @<br>
>> >> @<br>
>> >> @<br>
>> >> perform:with:<br>
>> >> @<br>
>> >> @<br>
>> >> species<br>
>> >> species<br>
>> >> at:put:<br>
>> >> @<br>
>> >> basicNew<br>
>> >> basicNew:<br>
>> >><br>
>> >> stack page bytes 4096 available headroom 3300 minimum unused headroom<br>
>> >> 2228<br>
>> >><br>
>> >> (last object overwritten)<br>
>> >><br>
>> >> frank<br>
>> >><br>
>> ><br>
>> ><br>
>> ><br>
>> > --<br>
>> > best,<br>
>> > Eliot<br>
>> ><br>
>> ><br>
>> ><br>
>><br>
><br>
><br>
><br>
> --<br>
> best,<br>
> Eliot<br>
><br>
><br>
><br>
<br>
</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br>best,<div>Eliot</div>