[Vm-dev] Intermittent AttachableFileStream error during 7:36 and 10:36 today

Bob Westergaard bwestergaard at gmail.com
Wed May 19 21:17:21 UTC 2021


I wonder if the file/pipe sessionID comparison with the getThisSessionID()
that is failing in a primitive somewhere.    I guess I'll look at how that
is created.

-- Bob

On Wed, May 19, 2021 at 2:06 PM Bob Westergaard <bwestergaard at gmail.com>
wrote:

>
> Hi Dave,
>
> I'm changing the system time before starting the image.
>
> -- Bob
>
> On Wed, May 19, 2021 at 2:02 PM David T. Lewis <lewis at mail.msen.com>
> wrote:
>
>>
>> Wos, that's a new one on me. What exactly are you changing on your
>> computer, are you changing the system time, or changing time zone?
>>
>> Dave
>>
>> On Wed, May 19, 2021 at 12:17:58PM -0700, Bob Westergaard wrote:
>> >
>> > Hi,
>> >
>> > I have a rather bizarre intermittent failure that I'd see if anyone else
>> > can reproduce.
>> >
>> > I've taken the following:
>> >
>> >
>> http://files.squeak.org/5.3/Squeak5.3-19435-64bit/Squeak5.3-19435-64bit-202003021730-Linux.zip
>> >
>> > Started it up and loaded the latest system updates and the OSProcess
>> > package (access OS functions).
>> >
>> > I then did:
>> >
>> >     CommandShell command: 'date'
>> >
>> > This works as I'd expect it too.
>> >
>> > However, what is interesting is that if I change the time on the
>> machine to
>> > any time between 7:36AM and 10:36AM (PDT, I'm in San Jose, CA) for today
>> > (May 19th) this call fails with the stack below.  I'm quitting the image
>> > between time changes.
>> >
>> > There was no failure for the same time period yesterday.  Nor does it
>> > appear to fail for any other time period today.
>> >
>> > -- Bob
>> >
>> > Stack follows:
>> >
>> > 19 May 2021 10:30:20.503624 am
>> >
>> > VM: unix - Smalltalk
>> > Image: Squeak5.3 [latest update: #19458]
>> >
>> > SecurityManager state:
>> > Restricted: false
>> > FileAccess: true
>> > SocketAccess: true
>> > Working Dir
>> > /scratch/bwesterg/squeak/Squeak5.3-19435-64bit-202003021730-Linux/shared
>> > Trusted Dir
>> >
>> /scratch/bwesterg/squeak/Squeak5.3-19435-64bit-202003021730-Linux/shared/secure
>> > Untrusted Dir
>> >
>> /scratch/bwesterg/squeak/Squeak5.3-19435-64bit-202003021730-Linux/shared/My
>> > Squeak
>> >
>> > AioEventHandler(Object)>>notify:
>> > Receiver: an AioEventHandler
>> > Arguments and temporary variables:
>> > aString: 'aio event forwarding not supported'
>> > Receiver's instance variables:
>> > dependents: nil
>> > semaphore: nil
>> > semaIndex: nil
>> > handlerProc: nil
>> > descriptor: nil
>> >
>> > [] in AioEventHandler>>initializeForExceptions:readEvents:writeEvents:
>> > Receiver: an AioEventHandler
>> > Arguments and temporary variables:
>> > <<error during printing>
>> > Receiver's instance variables:
>> > dependents: nil
>> > semaphore: nil
>> > semaIndex: nil
>> > handlerProc: nil
>> > descriptor: nil
>> >
>> > BlockClosure>>cull:
>> > Receiver: [closure] in
>> > AioEventHandler>>initializeForExceptions:readEvents:writeEvents:
>> > Arguments and temporary variables:
>> > firstArg: Warning: aio event forwarding not supported
>> > Receiver's instance variables:
>> > outerContext:
>> > AioEventHandler>>initializeForExceptions:readEvents:writeEvents:
>> > startpc: 154
>> > numArgs: 1
>> >
>> > [] in Context>>handleSignal:
>> > Receiver: BlockClosure>>on:do:
>> > Arguments and temporary variables:
>> > <<error during printing>
>> > Receiver's instance variables:
>> > sender: AioEventHandler>>initializeForExceptions:readEvents:writeEvents:
>> > pc: 32
>> > stackp: 3
>> > method: (BlockClosure>>#on:do: "a CompiledMethod(1660548)")
>> > closureOrNil: nil
>> > receiver: [closure] in
>> >
>> AioEventHandler>>initializeForExceptions:readEvents:writeEvents:...etc...
>> >
>> > BlockClosure>>ensure:
>> > Receiver: [closure] in Context>>handleSignal:
>> > Arguments and temporary variables:
>> > aBlock: [closure] in Context>>handleSignal:
>> > complete: nil
>> > returnValue: nil
>> > Receiver's instance variables:
>> > outerContext: Context>>handleSignal:
>> > startpc: 174
>> > numArgs: 0
>> >
>> > Context>>handleSignal:
>> > Receiver: BlockClosure>>on:do:
>> > Arguments and temporary variables:
>> > exception: Warning: aio event forwarding not supported
>> > handlerActive: true
>> > val: nil
>> > Receiver's instance variables:
>> > sender: AioEventHandler>>initializeForExceptions:readEvents:writeEvents:
>> > pc: 32
>> > stackp: 3
>> > method: (BlockClosure>>#on:do: "a CompiledMethod(1660548)")
>> > closureOrNil: nil
>> > receiver: [closure] in
>> >
>> AioEventHandler>>initializeForExceptions:readEvents:writeEvents:...etc...
>> >
>> > Warning(Exception)>>signal
>> > Receiver: Warning: aio event forwarding not supported
>> > Arguments and temporary variables:
>> >
>> > Receiver's instance variables:
>> > messageText: 'aio event forwarding not supported'
>> > tag: nil
>> > signalContext: Warning(Exception)>>signal
>> > handlerContext: BlockClosure>>on:do:
>> > outerContext: nil
>> >
>> > Warning(Exception)>>signal:
>> > Receiver: Warning: aio event forwarding not supported
>> > Arguments and temporary variables:
>> > signalerText: 'aio event forwarding not supported'
>> > Receiver's instance variables:
>> > messageText: 'aio event forwarding not supported'
>> > tag: nil
>> > signalContext: Warning(Exception)>>signal
>> > handlerContext: BlockClosure>>on:do:
>> > outerContext: nil
>> >
>> > Warning class>>signal:
>> > Receiver: Warning
>> > Arguments and temporary variables:
>> > signalerText: 'aio event forwarding not supported'
>> > Receiver's instance variables:
>> > superclass: Notification
>> > methodDict: a MethodDictionary(#defaultAction->(Warning>>#defaultAction
>> "a
>> > CompiledMethod...etc...
>> > format: 65541
>> > instanceVariables: nil
>> > organization: ('priv handling' defaultAction)
>> >
>> > subclasses: {Deprecation . ServiceCancelled . SAXWarning .
>> > UndeclaredVariableWarning...etc...
>> > name: #Warning
>> > classPool: nil
>> > sharedPools: nil
>> > environment: nil
>> > category: #'Kernel-Exceptions'
>> > suppressed: false
>> > resetOnStartUp: false
>> >
>> > AioEventHandler(Object)>>notify:
>> > Receiver: an AioEventHandler
>> > Arguments and temporary variables:
>> > aString: 'aio event forwarding not supported'
>> > Receiver's instance variables:
>> > dependents: nil
>> > semaphore: nil
>> > semaIndex: nil
>> > handlerProc: nil
>> > descriptor: nil
>> >
>> > AioEventHandler>>aioEnable:forSemaphore:externalObject:
>> > Receiver: an AioEventHandler
>> > Arguments and temporary variables:
>> > ioDescriptor: nil
>> > semaphoreIndex: 17
>> > trueOrFalse: true
>> > Receiver's instance variables:
>> > dependents: nil
>> > semaphore: nil
>> > semaIndex: nil
>> > handlerProc: nil
>> > descriptor: nil
>> >
>> > [] in AioEventHandler>>initializeForExceptions:readEvents:writeEvents:
>> > Receiver: an AioEventHandler
>> > Arguments and temporary variables:
>> > <<error during printing>
>> > Receiver's instance variables:
>> > dependents: nil
>> > semaphore: nil
>> > semaIndex: nil
>> > handlerProc: nil
>> > descriptor: nil
>> >
>> > BlockClosure>>on:do:
>> > Receiver: [closure] in
>> > AioEventHandler>>initializeForExceptions:readEvents:writeEvents:
>> > Arguments and temporary variables:
>> > exceptionOrExceptionSet: Warning
>> > handlerAction: [closure] in
>> >
>> AioEventHandler>>initializeForExceptions:readEvents:writeEvents:...etc...
>> > handlerActive: false
>> > Receiver's instance variables:
>> > outerContext:
>> > AioEventHandler>>initializeForExceptions:readEvents:writeEvents:
>> > startpc: 140
>> > numArgs: 0
>> >
>> > AioEventHandler>>initializeForExceptions:readEvents:writeEvents:
>> > Receiver: an AioEventHandler
>> > Arguments and temporary variables:
>> > exceptionEventFlag: true
>> > readEventFlag: true
>> > writeEventFlag: false
>> > Receiver's instance variables:
>> > dependents: nil
>> > semaphore: nil
>> > semaIndex: nil
>> > handlerProc: nil
>> > descriptor: nil
>> >
>> > AioEventHandler>>forFileStream:exceptions:readEvents:writeEvents:
>> > Receiver: an AioEventHandler
>> > Arguments and temporary variables:
>> > aFileStream: BufferedAsyncFileReadStream: 'pipeReader'
>> > exceptionEventFlag: true
>> > readEventFlag: true
>> > writeEventFlag: false
>> > Receiver's instance variables:
>> > dependents: nil
>> > semaphore: nil
>> > semaIndex: nil
>> > handlerProc: nil
>> > descriptor: nil
>> >
>> > AioEventHandler class>>forFileStream:exceptions:readEvents:writeEvents:
>> > Receiver: AioEventHandler
>> > Arguments and temporary variables:
>> > aFileStream: BufferedAsyncFileReadStream: 'pipeReader'
>> > exceptionEventFlag: true
>> > readEventFlag: true
>> > writeEventFlag: false
>> > Receiver's instance variables:
>> > superclass: Model
>> > methodDict: a
>> MethodDictionary(#aioDisable:->(AioEventHandler>>#aioDisable:
>> > "a CompiledMethod...etc...
>> > format: 65541
>> > instanceVariables: #('semaphore' 'semaIndex' 'handlerProc' 'descriptor')
>> > organization: ('aio event forwarding' aioDisable:
>> > aioEnable:forSemaphore:externalObject:...etc...
>> > subclasses: nil
>> > name: #AioEventHandler
>> > classPool: a Dictionary(#AioPluginPresent->true )
>> > sharedPools: nil
>> > environment: Smalltalk
>> > category: #'OSProcess-AIO'
>> >
>> > BufferedAsyncFileReadStream(AsyncFileReadStream)>>enableEventHandling
>> > Receiver: BufferedAsyncFileReadStream: 'pipeReader'
>> > Arguments and temporary variables:
>> >
>> > Receiver's instance variables:
>> >
>> >
>> > BufferedAsyncFileReadStream(AsyncFileReadStream)>>initialize
>> > Receiver: BufferedAsyncFileReadStream: 'pipeReader'
>> > Arguments and temporary variables:
>> >
>> > Receiver's instance variables:
>> >
>> >
>> > BufferedAsyncFileReadStream class(AttachableFileStream
>> > class)>>name:attachTo:writable:
>> > Receiver: BufferedAsyncFileReadStream
>> > Arguments and temporary variables:
>> > aSymbolOrString: 'pipeReader'
>> > anIOHandle: #[93 179 159 128 0 0 0 0 48 162 123 2 0 0 0 0 0 0 0 0 0 0 0
>> 0]
>> > readWriteFlag: false
>> > Receiver's instance variables:
>> > superclass: AsyncFileReadStream
>> > methodDict: a
>> >
>> MethodDictionary(#actAsExecutor->(BufferedAsyncFileReadStream>>#a...etc...
>> > format: 65552
>> > instanceVariables: #('nonBlockingMode' 'readBuffer' 'readSyncSemaphore'
>> > 'dataAv...etc...
>> > organization: ('finalization' actAsExecutor)
>> > ('read ahead buffer' appendAllToBuffer:...etc...
>> > subclasses: nil
>> > name: #BufferedAsyncFileReadStream
>> > classPool: nil
>> > sharedPools: nil
>> > environment: Smalltalk
>> > category: #'OSProcess-Base'
>> >
>> >
>> > --- The full stack ---
>> > AioEventHandler(Object)>>notify:
>> > [] in AioEventHandler>>initializeForExceptions:readEvents:writeEvents:
>> > BlockClosure>>cull:
>> > [] in Context>>handleSignal:
>> > BlockClosure>>ensure:
>> > Context>>handleSignal:
>> > Warning(Exception)>>signal
>> > Warning(Exception)>>signal:
>> > Warning class>>signal:
>> > AioEventHandler(Object)>>notify:
>> > AioEventHandler>>aioEnable:forSemaphore:externalObject:
>> > [] in AioEventHandler>>initializeForExceptions:readEvents:writeEvents:
>> > BlockClosure>>on:do:
>> > AioEventHandler>>initializeForExceptions:readEvents:writeEvents:
>> > AioEventHandler>>forFileStream:exceptions:readEvents:writeEvents:
>> > AioEventHandler class>>forFileStream:exceptions:readEvents:writeEvents:
>> > BufferedAsyncFileReadStream(AsyncFileReadStream)>>enableEventHandling
>> > BufferedAsyncFileReadStream(AsyncFileReadStream)>>initialize
>> > BufferedAsyncFileReadStream class(AttachableFileStream
>> > class)>>name:attachTo:writable:
>> >  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
>> > AttachableFileStream>>asBufferedAsyncFileReadStream
>> > ExternalPipe>>setBufferedReader
>> > PipeableOSProcess(PipeJunction)>>enableOutputStreamTriggers
>> > PipeableOSProcess>>enableEventTriggers
>> > PipeableOSProcess(PipeJunction)>>prepareOutputForInternalReader
>> > PipeableOSProcess>>prepareOutputForInternalReader
>> > PipeableOSProcess(PipeJunction)>>prepareOutputFor:
>> > ProxyPipeline>>fromString:shell:
>> > ProxyPipeline class>>fromString:shell:
>> > CommandShell>>pipelineCollectionFrom:
>> > CommandShell>>evaluateOrMakePipelinesFrom:
>> > CommandShell>>command:echo:
>> > [] in CommandShell>>processCommand:echo:
>> > [] in BlockClosure>>newProcess
>>
>>
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