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Re: HELP! My app crashes on startup, with a very weird stack trace.
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Re: HELP! My app crashes on startup, with a very weird stack trace.

  • Subject: Re: HELP! My app crashes on startup, with a very weird stack trace.
  • From: Ken Ferry <email@hidden>
  • Date: Tue, 2 Feb 2010 18:51:52 +0000
Hi Oleg,

Unfortunately, the accessibility mechanism uses unexceptional exceptions
under the hood.  These are a normal part of operation.  They shouldn't be
unhandled though… are you sure you're reporting what you think you are?

-Ken

On Tue, Feb 2, 2010 at 6:41 PM, Oleg Krupnov <email@hidden> wrote:

> Hi Corbin,
>
> Thanks for your quick response. You are right, I should have been more
> specific. This is not a "crash" in precise meaning. This is an
> unhandled exception raised by appkit's accessibility and caught by my
> crash reporter facility that prints the stack trace and sends it to me
> by e-mail. There is no real, severe crash like that one when you see
> the Apple's crash report dialog.
>
> The question is -- why this exception is raised? I don't even mention
> anything related to AX anywhere in my app. I must confess I have never
> even read the accessibility section of the docs and don't know what it
> is.
>
> >From the stack trace it appears that the exception occurs even before
> any of my own code is entered,  somewhere in system frameworks.
>
> And it happens only on selected Macs.
>
> Do you have any idea?
>
> Thanks.
>
> On Tue, Feb 2, 2010 at 8:34 PM, Corbin Dunn <email@hidden> wrote:
> > Oleg,
> >
> > I think you are misinterpreting an exception being raised as a crash of
> your application. The bt's below are not crashes; they are exceptions being
> raised (and caught) by appkit's accessibility.
> >
> > I understand that you have a problem with your app crashing -- do you
> have some actual crash reports? If so, reply with those to the list and we
> may be able to help you.
> >
> > -corbin
> >
> > On Feb 2, 2010, at 10:04 AM, Oleg Krupnov wrote:
> >
> >> Hi,
> >>
> >> After publishing an update of my app, I have received quite a few
> >> crash dumps with very weird stack traces that I cannot understand and
> >> fix.
> >>
> >> Namely, the exception message says that AXTitle, or AXWindow or
> >> AXValue or AXDocument etc. is unsupported by NSWindow, NSOpenPanel,
> >> NSApplication and others. Does it have something to do with
> >> accessibility? In what way?
> >>
> >> If someone knows what's that supposed to mean, a quick response would
> >> be very much appreciated. This is an emergency for me.
> >>
> >> Here's one of those logs (All those users are running Snow Leopard
> 10.6.2):
> >>
> >> MESSAGE:
> >> "AXTitle" attribute unsupported by: <NSOpenPanel: 0x5bb190>
> >>
> >> STACK TRACE:
> >> #0  0x98b80d24 NSExceptionHandlerExceptionRaiser()
> >>
> (/System/Library/Frameworks/ExceptionHandling.framework/Versions/A/ExceptionHandling)
> >> #1  0x94bc5509 objc_exception_throw()  (/usr/lib/libobjc.A.dylib)
> >> #2  0x97a91a21 +[NSException raise]
> >>
> (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation)
> >> #3  0x91d9a55c NSAccessibilityAttributeValue()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #4  0x91fb243f CopyAppKitUIElementAttributeValueNoCatch()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #5  0x91fb49d7 CopyAttributeValue()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #6  0x9476bad3 _AXXMIGCopyAttributeValue()
> >>
> (/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices)
> >> #7  0x94775b96 _XCopyAttributeValue()
> >>
> (/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices)
> >> #8  0x94747c39 mshMIGPerform()
> >>
> (/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices)
> >> #9  0x979b28db __CFRunLoopRun()
> >>
> (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation)
> >> #10 0x979b0864 CFRunLoopRunSpecific()
> >>
> (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation)
> >> #11 0x979b0691 CFRunLoopRunInMode()
> >>
> (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation)
> >> #12 0x973c9f0c RunCurrentEventLoopInMode()
> >>
> (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox)
> >> #13 0x973c9cc3 ReceiveNextEventCommon()
> >>
> (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox)
> >> #14 0x973c9b48 BlockUntilNextEventMatchingListInMode()
> >>
> (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox)
> >> #15 0x91d4eac5 _DPSNextEvent()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #16 0x91d4e306 -[NSApplication
> >> nextEventMatchingMask:untilDate:inMode:dequeue:]()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #17 0x13a2754b +[NSApplication
> >> nextEventMatchingMask:untilDate:inMode:dequeue:]
> >> (/Library/PreferencePanes/Smart Scroll.prefPane/Contents/MacOS/Smart
> >> Scroll.bundle/Contents/MacOS/Smart Scroll)
> >> #18 0x91d1049f +[NSApplication run]
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #19 0x91d08535 NSApplicationMain()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #20 0x0022ca start()
>  (/Applications/DaisyDisk.app/Contents/MacOS/DaisyDisk)
> >> #21 0x000002 ??()  (??)
> >>
> >> Here is another:
> >>
> >> MESSAGE:
> >> "AXValue" attribute unsupported by: <NSButtonCell: 0x5cd0d0>
> >>
> >> STACK TRACE:
> >> #0  0x95d86d24 NSExceptionHandlerExceptionRaiser()
> >>
> (/System/Library/Frameworks/ExceptionHandling.framework/Versions/A/ExceptionHandling)
> >> #1  0x9212d509 objc_exception_throw()  (/usr/lib/libobjc.A.dylib)
> >> #2  0x94dcba21 +[NSException raise]
> >>
> (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation)
> >> #3  0x938de55c NSAccessibilityAttributeValue()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #4  0x93af643f CopyAppKitUIElementAttributeValueNoCatch()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #5  0x93af89d7 CopyAttributeValue()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #6  0x90b34ad3 _AXXMIGCopyAttributeValue()
> >>
> (/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices)
> >> #7  0x90b3eb96 _XCopyAttributeValue()
> >>
> (/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices)
> >> #8  0x90b10c39 mshMIGPerform()
> >>
> (/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices)
> >> #9  0x94cec8db __CFRunLoopRun()
> >>
> (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation)
> >> #10 0x94cea864 CFRunLoopRunSpecific()
> >>
> (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation)
> >> #11 0x94cea691 CFRunLoopRunInMode()
> >>
> (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation)
> >> #12 0x98525f0c RunCurrentEventLoopInMode()
> >>
> (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox)
> >> #13 0x98525bff ReceiveNextEventCommon()
> >>
> (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox)
> >> #14 0x98525b48 BlockUntilNextEventMatchingListInMode()
> >>
> (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox)
> >> #15 0x93892ac5 _DPSNextEvent()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #16 0x93892306 +[NSApplication
> >> nextEventMatchingMask:untilDate:inMode:dequeue:]
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #17 0x9385449f +[NSApplication run]
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #18 0x9384c535 NSApplicationMain()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #19 0x0022ca start()
>  (/Applications/DaisyDisk.app/Contents/MacOS/DaisyDisk)
> >> #20 0x000002 ??()  (??)
> >>
> >> Here's yet another:
> >>
> >> MESSAGE:
> >> "AXValue" attribute unsupported by: <MainWindow: 0x227270>
> >>
> >> STACK TRACE:
> >> #0  0x95d86d24 NSExceptionHandlerExceptionRaiser()
> >>
> (/System/Library/Frameworks/ExceptionHandling.framework/Versions/A/ExceptionHandling)
> >> #1  0x9212d509 objc_exception_throw()  (/usr/lib/libobjc.A.dylib)
> >> #2  0x94dcba21 +[NSException raise]
> >>
> (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation)
> >> #3  0x938de55c NSAccessibilityAttributeValue()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #4  0x93af643f CopyAppKitUIElementAttributeValueNoCatch()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #5  0x93af89d7 CopyAttributeValue()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #6  0x90b34ad3 _AXXMIGCopyAttributeValue()
> >>
> (/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices)
> >> #7  0x90b3eb96 _XCopyAttributeValue()
> >>
> (/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices)
> >> #8  0x90b10c39 mshMIGPerform()
> >>
> (/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices)
> >> #9  0x94cec8db __CFRunLoopRun()
> >>
> (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation)
> >> #10 0x94cea864 CFRunLoopRunSpecific()
> >>
> (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation)
> >> #11 0x94cea691 CFRunLoopRunInMode()
> >>
> (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation)
> >> #12 0x98525f0c RunCurrentEventLoopInMode()
> >>
> (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox)
> >> #13 0x98525cc3 ReceiveNextEventCommon()
> >>
> (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox)
> >> #14 0x98525b48 BlockUntilNextEventMatchingListInMode()
> >>
> (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox)
> >> #15 0x93892ac5 _DPSNextEvent()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #16 0x93892306 +[NSApplication
> >> nextEventMatchingMask:untilDate:inMode:dequeue:]
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #17 0x9385449f +[NSApplication run]
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #18 0x9384c535 NSApplicationMain()
> >> (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit)
> >> #19 0x0022ca start()
>  (/Applications/DaisyDisk.app/Contents/MacOS/DaisyDisk)
> >> #20 0x000002 ??()  (??)
> >>
> >> Thanks!
> >
> >
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    • Re: HELP! My app crashes on startup, with a very weird stack trace.
      • From: Oleg Krupnov <email@hidden>
References: 
 >HELP! My app crashes on startup, with a very weird stack trace. (From: Oleg Krupnov <email@hidden>)
 >Re: HELP! My app crashes on startup, with a very weird stack trace. (From: Corbin Dunn <email@hidden>)
 >Re: HELP! My app crashes on startup, with a very weird stack trace. (From: Oleg Krupnov <email@hidden>)

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