Open Radar

 
Summary:
Starting in iOS 8, UIHost.performTaskWithPathArgumentsTimeout always returns null.

Steps to Reproduce:
1. build and run app with Xcode 5.1.1 with base SDK 7* on a physical device
2. launch Instruments 5.1.1 and execute the follow script in a UIAutomation template

```
1 var target = UIATarget.localTarget();
2 var host = target.host();
3		 
4 var result = host.performTaskWithPathArgumentsTimeout("/bin/echo", ["Hello World"], 5);
5		 
6 UIALogger.logDebug("exitCode: " + result.exitCode);
7 UIALogger.logDebug("stdout: " + result.stdout);
8 UIALogger.logDebug("stderr: " + result.stderr);
```

3.1 repeat with Xcode 6b4 with base SDK 8* and Instruments 6.0

Expected Results:
For both SDK 7 and 8

```
exitCode: 0
stdout: Hello World\n
stderr:
```

Actual Results:
With 5.1.1, Instruments 5.1.1, iOS 7.1.1 - the expected output.

With Xcode 6b4, Instruments 6.0, iOS 8b4 

- Script threw an uncaught JavaScript error: null is not an object (evaluating 'result.exitCode') on line 6


Version:
* OS X 10.9.4 (13E28)
* OS X 10.10 (14A298i)

Xcode6-Beta4
Instruments 6.0 (56127.2)
iOS 8b4

Xcode 5.1.1
Instruments 5.1.1
iOS 7

Notes:


Configuration:
UIHost.performTaskWithPathArgumentsTimeout works on iOS 6 + iOS 7, but is broken on iOS 8.