Reproduction steps:
1. Build and run an empty project on the device
2. Start the touch input by touching the screen and don't lift up the finger
3. Tap the home button while still continuing the touch started in the 2nd step
4. Notice that the home screen is shown
5. Observe the logcat log while still continuing the touch started in the 2nd step
6. Notice that the app is killed by the activity manager after a few seconds

Reproduced on:
Google Nexus 5 with Android 4.4.2

Reproduced with:
Unity Version 4.2.1f4 (4d30acc925c2)
Unity Version 4.2.2f1 (54f0fc09defb)
Unity Version 4.3.4f1 (e444f76e01cd)