title: [_NSViewDrawOperation release]: message sent to deallocated?
body: <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>