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

[Bob Westergaard]

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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