[Vm-dev] Error: sweep failed to find exact end of memory

Eliot Miranda eliot.miranda at gmail.com
Wed Dec 8 17:25:14 UTC 2010


On Wed, Dec 8, 2010 at 1:27 AM, Mariano Martinez Peck <marianopeck at gmail.com
> wrote:

>
>
>
> On Wed, Dec 8, 2010 at 1:00 AM, Andreas Raab <andreas.raab at gmx.de> wrote:
>
>>
>> The error means that the heap is corrupted. It has nothing to do with
>> number of objects. Basically, what happens is that the garbage collector
>> found that the last object it compacted in memory did not end exactly at the
>> current allocation pointer. This cannot happen under any circumstances and
>> means that the heap is in a corrupted state.
>>
>
> Thanks Andreas. And what does it mean that the "heap is corrupted"? can you
> give me details?
>

An example would be a stray write into the size field of an object which
would cause it to have the wrong size and hence break the parse.


> Thanks again in advance,
>
> Mariano
>
>
>>
>> Why it happens is your guess but I can tell you that it must've happened
>> since the last (incr/full) GC since this test is extremely cheap and
>> therefore done on every GC cycle.
>>
>> Cheers,
>>  - Andreas
>>
>>
>> On 12/7/2010 3:34 PM, Mariano Martinez Peck wrote:
>>
>>>
>>>
>>>
>>>
>>> Hi, I am having this error quite frequently while working with the
>>> proxies for CompiledMethods. I don't understand....I am reaching a
>>> maximum in the memory? I checked both, the amount of Objects I create
>>> and the amount of memory and doesn't look that large.  I am in mac and I
>>> am even doing -memory 1500m and also setting HeapSize in plist.info
>>> <http://plist.info>.
>>>
>>>
>>> Any hints?  I serached in Google and I found a bug with signed and
>>> unsiged stuff...but i didn't understand and I am not sure which is the
>>> status today (the threads were quite old).
>>>
>>> Here is an example:
>>>
>>>
>>> sweep failed to find exact end of memory
>>>
>>> 594035904 Object>myDependents:
>>> 594035812 Object>breakDependents
>>> 594035720 Object>actAsExecutor
>>> 594035628 StandardFileStream>actAsExecutor
>>> 594035496 Object>executor
>>> 594035332 WeakRegistry>add:
>>> 594035240 >register:
>>> 594035148 StandardFileStream>register
>>> 594034104 StandardFileStream>open:forWrite:
>>> 594032588 >fileNamed:
>>> 594032496 FuelMareaSerializer>mareaUnserializeMethodFrom:
>>> 594032216 >mareaLoadCompiledMethodFor:
>>> 594032124 >mareaUninstallForProxy:ifNotInstalled:
>>> 594032032 >mareaUninstallForProxy:
>>> 594027820 >mareaHandleRun:with:in:forProxy:
>>> 594027640 AbstractCompiledMethodProxy>run:with:in:
>>> 593741548 OMenuMorph>drawOn:
>>> 593741456 CompiledMethod>valueWithReceiver:arguments:
>>> 593740508 >mareaHandleRun:with:in:forProxy:
>>> 593740416 AbstractCompiledMethodProxy>run:with:in:
>>> 593740324 Canvas>draw:
>>> 593740232 Canvas>drawMorph:
>>> 593740140 Morph>fullDrawOn:
>>> 593740028 FormCanvas>roundCornersOf:in:during:
>>> 593739936 Canvas>roundCornersOf:during:
>>> 593739808 Morph>fullDrawOn:
>>> 593739628 Canvas>fullDraw:
>>> 593739536 Canvas>fullDrawMorph:
>>> 593739004 WorldState>drawWorld:submorphs:invalidAreasOn:
>>> 593738104 Rectangle>allAreasOutsideList:startingAt:do:
>>> 593738012 Rectangle>allAreasOutsideList:do:
>>> 593738708 WorldState>drawWorld:submorphs:invalidAreasOn:
>>> 593737920 SequenceableCollection>do:
>>> 593737652 WorldState>drawWorld:submorphs:invalidAreasOn:
>>> 593737532 WorldState>displayWorld:submorphs:
>>> 593737440 FormCanvas>roundCornersOf:in:during:
>>> 593737348 Canvas>roundCornersOf:during:
>>> 593737244 WorldState>displayWorld:submorphs:
>>> 593737152 PasteUpMorph>privateOuterDisplayWorld
>>> 593737004 PasteUpMorph>displayWorld
>>> 593736912 WorldState>displayWorldSafely:
>>> 593736820 BlockClosure>on:do:
>>> 593736728 BlockClosure>ifError:
>>> 593736636 WorldState>displayWorldSafely:
>>> 593731064 WorldState>doOneCycleNowFor:
>>> 593730972 WorldState>doOneCycleFor:
>>> 593730880 PasteUpMorph>doOneCycle
>>> 564294164 >spawnNewProcess
>>> 564294036 BlockClosure>newProcess
>>>
>>>
>>> But this is just one example.
>>>
>>> Thanks in advance for any help
>>>
>>> Mariano
>>>
>>
>
>
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