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  1. PO[_NSViewDrawOperation release]: message sent to deallocated?
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    <p>I have a <code>NSCollectionView</code> which consist of some images.when mouse scroll over the <code>NSCollectionView</code>,in some case the app crash.So I enable <code>Zombie Object</code> and <code>Malloc Stack</code>.When app crash,<code>-[_NSViewDrawOperation release]: message sent to deallocated instance 0x11ac815e0</code> is printed in the console.And I print the crash malloc using malloc_history.</p> <pre><code>(gdb) info malloc-history 0x11ac815e0 warning: MallocStackLoggingNoCompact not set in target's environment so the malloc history will not be available. Alloc: Block address: 0x000000011ac815e0 length: 136 Stack - pthread: 0x7fff7981b960 number of frames: 46 0: 0x7fff8e11136f in malloc_zone_calloc 1: 0x7fff8e11215d in calloc 2: 0x7fff8d3c2182 in CGClipStackCreateMutableCopy 3: 0x7fff8d3c2140 in maybeCopyClipState 4: 0x7fff8d3c45c3 in CGGStateClipToRect 5: 0x7fff8d3c4583 in CGContextClipToRect 6: 0x7fff8d46fca0 in CGContextClipToRects 7: 0x7fff8eb0cde9 in -[NSView _drawRect:clip:] 8: 0x7fff8eb3a49b in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] 9: 0x7fff8eb0a8a9 in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] 10: 0x7fff8eb0bb5e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] 11: 0x7fff8eb0bb5e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] 12: 0x7fff8eb0bb5e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] 13: 0x7fff8eb051bb in -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] 14: 0x7fff8eafdba1 in -[NSView displayIfNeeded] 15: 0x7fff8eb02d9e in -[NSClipView _immediateScrollToPoint:] 16: 0x7fff8eb01381 in -[NSClipView scrollToPoint:] 17: 0x7fff8ebef25b in -[NSScrollView scrollClipView:toPoint:] 18: 0x7fff8ebeeffe in -[NSClipView _scrollTo:animateScroll:flashScrollerKnobs:] 19: 0x7fff8ebf1fd7 in -[NSClipView _scrollTo:animate:] 20: 0x7fff8f22c876 in -[NSScrollView _doScroller:hitPart:multiplier:] 21: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 22: 0x7fff8ebc48ca in -[NSApplication sendAction:to:from:] 23: 0x7fff8ebc47fe in -[NSControl sendAction:to:] 24: 0x7fff8f006586 in -[NSScroller sendAction:to:] 25: 0x7fff8f007a3c in -[NSScroller(NSScrollerPrivate) _scrollByDelta:] 26: 0x7fff8f22b4c9 in -[NSScrollView _smoothScrollWithEvent:] 27: 0x7fff8f22a9f8 in -[NSScrollView scrollWheel:] 28: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 29: 0x7fff8eb938ba in forwardMethod 30: 0x7fff8f139127 in -[NSView scrollWheel:] 31: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 32: 0x7fff8eb938ba in forwardMethod 33: 0x7fff8f139127 in -[NSView scrollWheel:] 34: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 35: 0x7fff8eb938ba in forwardMethod 36: 0x7fff8f139127 in -[NSView scrollWheel:] 37: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 38: 0x7fff8eb938ba in forwardMethod 39: 0x7fff8f139127 in -[NSView scrollWheel:] 40: 0x7fff8eb8e0fc in -[NSWindow sendEvent:] 41: 0x7fff8eb26f74 in -[NSApplication sendEvent:] 42: 0x7fff8eabda0e in -[NSApplication run] 43: 0x7fff8ed39eac in NSApplicationMain 44: 0x100002232 in main at /Users/goham/goham/XcodeApp/BookMark_130424_2112/BookMark/main.m:13 45: 0x100002204 in start Dealloc: Block address: 0x000000011ac815e0 Stack - pthread: 0x7fff7981b960 number of frames: 43 0: 0x7fff8e11175a in free 1: 0x7fff8d3b39c9 in CGGStateRelease 2: 0x7fff8d3b3930 in CGGStackRestore 3: 0x7fff8d3b3909 in CGContextRestoreGState 4: 0x7fff8eb0d3f8 in -[NSView _drawRect:clip:] 5: 0x7fff8eb3a49b in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] 6: 0x7fff8eb0a8a9 in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] 7: 0x7fff8eb0bb5e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] 8: 0x7fff8eb0bb5e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] 9: 0x7fff8eb0bb5e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] 10: 0x7fff8eb051bb in -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] 11: 0x7fff8eafdba1 in -[NSView displayIfNeeded] 12: 0x7fff8eb02d9e in -[NSClipView _immediateScrollToPoint:] 13: 0x7fff8eb01381 in -[NSClipView scrollToPoint:] 14: 0x7fff8ebef25b in -[NSScrollView scrollClipView:toPoint:] 15: 0x7fff8ebeeffe in -[NSClipView _scrollTo:animateScroll:flashScrollerKnobs:] 16: 0x7fff8ebf1fd7 in -[NSClipView _scrollTo:animate:] 17: 0x7fff8f22c876 in -[NSScrollView _doScroller:hitPart:multiplier:] 18: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 19: 0x7fff8ebc48ca in -[NSApplication sendAction:to:from:] 20: 0x7fff8ebc47fe in -[NSControl sendAction:to:] 21: 0x7fff8f006586 in -[NSScroller sendAction:to:] 22: 0x7fff8f007a3c in -[NSScroller(NSScrollerPrivate) _scrollByDelta:] 23: 0x7fff8f22b4c9 in -[NSScrollView _smoothScrollWithEvent:] 24: 0x7fff8f22a9f8 in -[NSScrollView scrollWheel:] 25: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 26: 0x7fff8eb938ba in forwardMethod 27: 0x7fff8f139127 in -[NSView scrollWheel:] 28: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 29: 0x7fff8eb938ba in forwardMethod 30: 0x7fff8f139127 in -[NSView scrollWheel:] 31: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 32: 0x7fff8eb938ba in forwardMethod 33: 0x7fff8f139127 in -[NSView scrollWheel:] 34: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 35: 0x7fff8eb938ba in forwardMethod 36: 0x7fff8f139127 in -[NSView scrollWheel:] 37: 0x7fff8eb8e0fc in -[NSWindow sendEvent:] 38: 0x7fff8eb26f74 in -[NSApplication sendEvent:] 39: 0x7fff8eabda0e in -[NSApplication run] 40: 0x7fff8ed39eac in NSApplicationMain 41: 0x100002232 in main at /Users/goham/goham/XcodeApp/BookMark_130424_2112/BookMark/main.m:13 42: 0x100002204 in start Alloc: Block address: 0x000000011ac815e0 length: 96 Stack - pthread: 0x7fff7981b960 number of frames: 43 0: 0x7fff8e11136f in malloc_zone_calloc 1: 0x7fff8e11215d in calloc 2: 0x7fff899040c5 in class_createInstance 3: 0x7fff910d1ce7 in +[NSObject allocWithZone:] 4: 0x7fff89904035 in _objc_rootAlloc 5: 0x7fff8f24347a in -[_NSDisplayOperation queueDrawOperationForView:rect:rectSet:windowRegion:options:] 6: 0x7fff8eb0af7f in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] 7: 0x7fff8eb0bb5e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] 8: 0x7fff8eb0bb5e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] 9: 0x7fff8eb0bb5e in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] 10: 0x7fff8eb051bb in -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] 11: 0x7fff8eafdba1 in -[NSView displayIfNeeded] 12: 0x7fff8eb02d9e in -[NSClipView _immediateScrollToPoint:] 13: 0x7fff8eb01381 in -[NSClipView scrollToPoint:] 14: 0x7fff8ebef25b in -[NSScrollView scrollClipView:toPoint:] 15: 0x7fff8ebeeffe in -[NSClipView _scrollTo:animateScroll:flashScrollerKnobs:] 16: 0x7fff8ebf1fd7 in -[NSClipView _scrollTo:animate:] 17: 0x7fff8f22c876 in -[NSScrollView _doScroller:hitPart:multiplier:] 18: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 19: 0x7fff8ebc48ca in -[NSApplication sendAction:to:from:] 20: 0x7fff8ebc47fe in -[NSControl sendAction:to:] 21: 0x7fff8f006586 in -[NSScroller sendAction:to:] 22: 0x7fff8f007a3c in -[NSScroller(NSScrollerPrivate) _scrollByDelta:] 23: 0x7fff8f22b4c9 in -[NSScrollView _smoothScrollWithEvent:] 24: 0x7fff8f22a9f8 in -[NSScrollView scrollWheel:] 25: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 26: 0x7fff8eb938ba in forwardMethod 27: 0x7fff8f139127 in -[NSView scrollWheel:] 28: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 29: 0x7fff8eb938ba in forwardMethod 30: 0x7fff8f139127 in -[NSView scrollWheel:] 31: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 32: 0x7fff8eb938ba in forwardMethod 33: 0x7fff8f139127 in -[NSView scrollWheel:] 34: 0x7fff9111c70d in -[NSObject performSelector:withObject:] 35: 0x7fff8eb938ba in forwardMethod 36: 0x7fff8f139127 in -[NSView scrollWheel:] 37: 0x7fff8eb8e0fc in -[NSWindow sendEvent:] 38: 0x7fff8eb26f74 in -[NSApplication sendEvent:] 39: 0x7fff8eabda0e in -[NSApplication run] 40: 0x7fff8ed39eac in NSApplicationMain 41: 0x100002232 in main at /Users/goham/goham/XcodeApp/BookMark_130424_2112/BookMark/main.m:13 42: 0x100002204 in start </code></pre> <p>But I don't still understand this.Any one could help me.Thank you!</p>
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