NSImage Crop Crashing

When I try to crop an image using NSIma开发者_如何学Goge's imageFromRect, I get an EXEC_BAD_ACCESS crash about 50% of the time. This is something that runs on startup (triggered in an awakeFromNib), so the environment shouldn't be changing. I am not sure why it crashes one one launch and not another. When I have a breakpoint set before I crop the image I can see the image was loaded from file correctly, and seems to be of the proper dimensions. Any advice?

Here is the stack trace:

#0  0x97bb58c2 in ripc_RemoveEntry
#1  0x97b927b0 in ripc_AcquireImage
#2  0x97b903be in ripc_DrawImage
#3  0x930f9384 in CGContextDrawImage
#4  0x9463159f in __-[NSBitmapImageRep draw]_block_invoke_1
#5  0x9448e74b in __-[NSBitmapImageRep _performBlockUsingBackingCGImage:]_block_invoke_1
#6  0x94365232 in -[NSBitmapImageRep _performBlockUsingBacking:]
#7  0x9448e6b3 in -[NSBitmapImageRep _performBlockUsingBackingCGImage:]
#8  0x9462f87f in -[NSBitmapImageRep draw]
#9  0xb0006a03 in -[NSImage(Crop) imageFromRect:] at ThemeManager.m:325
#10 0xb000820a in -[FrameImages setImage:] at ThemeManager.m:270
#11 0xb0005f21 in -[ThemeManager setImage:forTheme:] at ThemeManager.m:63
#12 0xb0006397 in +[ThemeManager defaultThemeManager] at ThemeManager.m:39
#13 0xb0005b33 in -[SCThemedView layoutContentView] at SCThemedView.m:92
#14 0x9435ebaf in -[NSNibOutletConnector establishConnection]
#15 0x9435d33b in -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:]
#16 0x9435b450 in loadNib
#17 0x9435a848 in +[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:]
#18 0x9435a759 in +[NSBundle(NSNibLoading) loadNibFile:externalNameTable:withZone:]
#19 0x9435a6a4 in +[NSBundle(NSNibLoading) loadNibNamed:owner:]
#20 0x943574a9 in NSApplicationMain
#21 0x0000256a in start

Show us how you're loading the image. That crash is usually the result of an object getting freed before you're done with it.

There's no awakeFromNib in the stack trace; Instead, it looks like the crash happens while the nib loader is still in the process of making the connections ([NSNibOutletConnector establishConnection]), which means the drawing environment may not be properly set up yet.

Try moving the ThemeManager setup code (whatever's making the call to [ThemeManager defaultThemeManager]) from SCThemedView's layoutContentView method to SCThemedView's awakeFromNib.

If that doesn't work, try delaying all ThemeManager layout/drawing until after NSApplication's applicationDidFinishLaunching: method is called.