When trying to shrink the size of a partition, the period before the actual resizing happens (where Disk Utility says "Preparing to partition disk") hangs forever. I dug into Console to see what was going on and I came across this error, which is 100% reproducible for me as soon as I click "Apply" to resize the partition:
8/1/14 8:48:48.299 AM Disk Utility: *** setObjectForKey: object cannot be nil (key: FilesystemName) 8/1/14 8:48:48.301 AM Disk Utility: ( 0 CoreFoundation 0x00007fff879eb25c __exceptionPreprocess + 172 1 libobjc.A.dylib 0x00007fff82c08e75 objc_exception_throw + 43 2 CoreFoundation 0x00007fff878e622e -[__NSDictionaryM setObject:forKey:] + 1102 3 Partition 0x000000010681cdcc Partition + 110028 4 Partition 0x0000000106814883 Partition + 75907 5 AppKit 0x00007fff8834c06d -[NSAlert didEndAlert:returnCode:contextInfo:] + 90 6 AppKit 0x00007fff8834ba9a -[NSWindow endSheet:returnCode:] + 368 7 AppKit 0x00007fff8834b66d -[NSAlert buttonPressed:] + 107 8 AppKit 0x00007fff88210260 -[NSApplication sendAction:to:from:] + 327 9 AppKit 0x00007fff882100de -[NSControl sendAction:to:] + 86 10 AppKit 0x00007fff8825cc4d -[NSCell _sendActionFrom:] + 128 11 AppKit 0x00007fff88276655 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 2316 12 AppKit 0x00007fff88275a27 -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 487 13 AppKit 0x00007fff8827513d -[NSControl mouseDown:] + 706 14 AppKit 0x00007fff881f6a58 -[NSWindow sendEvent:] + 11296 15 AppKit 0x00007fff881955d4 -[NSApplication sendEvent:] + 2021 16 AppKit 0x00007fff87fe59f9 -[NSApplication run] + 646 17 AppKit 0x00007fff87fd0783 NSApplicationMain + 940 18 Disk Utility 0x0000000100e18867 Disk Utility + 6247 19 libdyld.dylib 0x00007fff8496a5fd start + 1 20 ??? 0x0000000000000001 0x0 + 1 )
I found this link which describes pretty much the same issue, but does not contain any useful suggestions for workarounds.
In case it is helpful, here is an image of Disk Utility at that moment. Note that I am dual-booting Mac OS and Ubuntu -- I assume the reason the
FilesystemName is nil is the same reason that the ext4 Ubuntu partition shows up as
Note: This is on 10.9.4 (Mavericks).