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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 22:41:27 +0200
Good point, Jesper.

But in this case, how should I catch real unhandled exceptions and
send bug reports? What is the recommended best practice?

Thanks!

On Tue, Feb 2, 2010 at 10:22 PM, Jesper Storm Bache <email@hidden> wrote:
> My advice is: Don't do this in release builds. There is nothing that says that Apple in the future will throw more exceptions inside their implementation (in a different framework) - and you'll then have to patch your handler again.
> Feel free to experiment with this kind of functionality in your debug builds.
> Alternatively have a "Debug level" preference that you can have users turn on (and off). Make the default "Off".
>
> Jesper
>
> On Feb 2, 2010, at 12:18 PM, Oleg Krupnov wrote:
>
>> Fixed now, it worked like a charm! :)
>>
>> Indeed, I was intercepting exceptions from the AX framework in my -
>> (BOOL)exceptionHandler:(NSExceptionHandler*)sender
>> shouldHandleException:(NSException*)exception mask:(unsigned int)mask
>> delegate method. This only occurs on Snow Leopard but not on Leopard.
>> I was able to reproduce the bug using the Accessibility Inspector
>> utility. And I have fixed it as advised.
>>
>> Thanks a ton to everybody who responded!!!
>>
>>
>> On Tue, Feb 2, 2010 at 9:09 PM, Jesper Storm Bache <email@hidden> wrote:
>>> Are you sure you are seeing "unhandled exceptions", or simply "NSExceptions" that are handled somewhere inside the Ax framework.
>>> If it is the latter, then you'll need to allow NSExceptions from inside the Ax framework to propagate to their handlers (also inside the Ax framework).
>>> Note: Apple does *not* guarantee that their implementation is NSException free; you just should not see such exceptions being thrown back to your code.
>>>
>>> For this reason I only enable NSException detection logic in my debug builds, and the current version of my debug handler is:
>>>
>>> void ExceptionCallback(id exceptionObject)
>>> {
>>>       bool doBreak = true;
>>>       if ([exceptionObject isKindOfClass:[NSException class]])
>>>       {
>>>               NSString* name = [exceptionObject name];
>>>
>>>               // Ignore exceptions from the accessibility framework because it uses
>>>               // exceptions for flow control
>>>               doBreak = ![name isEqualToString:NSAccessibilityException];
>>>       }
>>>
>>>       if (doBreak)
>>>       {
>>>               report_problem(...)
>>>       }
>>> }
>>>
>>> Jesper Storm Bache
>>>
>>> On Feb 2, 2010, at 10:58 AM, Oleg Krupnov wrote:
>>>
>>>> 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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>>>>>>
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>>>>>
>>>>>
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>
>
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  • Follow-Ups:
    • Re: HELP! My app crashes on startup, with a very weird stack trace.
      • From: Michael Ash <email@hidden>
    • Re: HELP! My app crashes on startup, with a very weird stack trace.
      • From: Jesper Storm Bache <email@hidden>
    • Re: HELP! My app crashes on startup, with a very weird stack trace.
      • From: Corbin Dunn <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>)
 >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: Jesper Storm Bache <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: Jesper Storm Bache <email@hidden>)

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