Hi Alex, I'm afraid I'm not able to help with your problem directly, but maybe I can provide an additional angle for debugging. I've seen frequent crashes using Dispatch, which may be related. I've had to remove multi-threading from my Core Data Document-Based application due to these crashes and in the process of trying to figure out if it's me, my code, or the underlying framework that's causing it I've arrived at the following example. It reproducibly causes a EXC_BAD_INSTRUCTION and prints unknown: [BUG] destination 0x8002989802c0 isn't in the auto zone to the console. The project is a "Core Data Document-Based Application" project (this is important) and simply includes a class A: class A def dispatch(&block) puts "dispatch" end end which is wired to an action in the document class: class MyDocument < NSPersistentDocument def init super if (self != nil) @a = A.new @queue = Dispatch::Queue.new('myqueue') end self end def windowNibName "MyDocument" end def dispatch(sender) @queue.async do @a.dispatch do |t| end end end end ----------------- The same setup works fine in a regular (no Cora Data, non-Document-Based) project. Note that even though the dispatch accepts a block but doesn't use it, this is actually required to trigger the error. Dispatching a method without parameters works fine. I should note I'm using the 2011-09-23 nightly on Lion with Xcode 4.2 (GM). Maybe that helps in tracking this down. Cheers, Sven On Oct 11, 2011, at 8:19, Alex Greif wrote:

The following code crashes with a segmentation fault. Any idea whether I misunderstood the usage or it is a macruby bug?

thanks, ALex.

---code------------------------------------------- framework 'Foundation'

class Foo def bar puts 'bar' end end

operation = NSInvocationOperation.alloc.initWithTarget Foo.new, selector: 'bar', object: nil

queue = NSOperationQueue.alloc.init queue.addOperation(operation)

# run the main loop for 2 seconds NSRunLoop.currentRunLoop.runUntilDate(NSDate.dateWithTimeIntervalSinceNow(2.0))

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