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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: Oleg Krupnov <email@hidden>
  • Date: Tue, 2 Feb 2010 20:58:38 +0200
Thanks Ken,

I don't quite understand your response though. What do you mean by
"unexceptional exceptions"? How should I handle those exceptions, and
why should I, if I don't make any calls to accessibility frameworks at
all?

The report I have included in the first post is all I have so far.



On Tue, Feb 2, 2010 at 8:51 PM, Ken Ferry <email@hidden> wrote:
> 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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  • Follow-Ups:
    • 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: Jesper Storm Bache <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>)
 >Re: HELP! My app crashes on startup, with a very weird stack trace. (From: Ken Ferry <email@hidden>)

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