VoiceOver/Accessibility APIs causing an underflow error in GC
| Originator: | pilky | ||
| Number: | rdar://7079054 | Date Originated: | 21-Jul-2009 07:53 PM |
| Status: | Open | Resolved: | No |
| Product: | Mac OS X | Product Version: | 10.5.7 |
| Classification: | Other Bug | Reproducible: | Always |
Summary: When using VoiceOver in a Garbage Collection enabled app, a series of errors are output along the lines of: Minim(27747,0xa06e4720) malloc: reference count underflow for 0x10e1290, break on auto_refcount_underflow_error to debug. Steps to Reproduce: Open a GC application (eg Xcode) and a console window. Then enable VoiceOver. You should see a series of those errors appearing Expected Results: The errors should not appear Actual Results: The errors appear Notes: I set a breakpoint as recommended in the error and got the following stack trace: #0 0x90ca0233 in auto_refcount_underflow_error #1 0x90cabab0 in Auto::Zone::dec_refcount_small_medium #2 0x90cabc0e in Auto::Zone::block_decrement_refcount #3 0x9417e5b2 in CFRelease #4 0x92d70d0e in _AXXMIGCopyMultipleAttributeValues #5 0x92d79a08 in _XCopyMultipleAttributeValues #6 0x92d414d8 in mshMIGPerform #7 0x9417c888 in CFRunLoopRunSpecific #8 0x9417cc78 in CFRunLoopRunInMode #9 0x949d928c in RunCurrentEventLoopInMode #10 0x949d90a5 in ReceiveNextEventCommon #11 0x949d8f19 in BlockUntilNextEventMatchingListInMode #12 0x91679d0d in _DPSNextEvent #13 0x916795c0 in -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] #14 0x916725fb in -[NSApplication run] #15 0x9163f834 in NSApplicationMain #16 0x00002795 in main at main.m:78
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