When I receive a remote notification on a record addition (didReceiveRemoteNotification called), I get the following error message:
_BSMachError: (os/
I just experienced this error. I was in a UIAlert Action block; when the block exited the error occurred (BTW the parent UIAlertViewController was created in a dispatch_async block so was I guess off main thread.
Anyway, I wrapped the action code itself in
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self handleActionForElement:thisType];
});
and error went away. Your mileage may vary!