Open Radar

 
Summary:
Users of our web app who have installed it to their home screens began reporting the app "crashing" after iOS 8 was released. Further investigation revealed that the "crash" was actually the app becoming unresponsive. We were able to distill the problem down to a failure with setTimeout where any asynchronous operations (we have many of them, we are using AngularJS) would fail. See http://jsfiddle.net/24b2eLyn/1/.

Steps to Reproduce:
1. In an iOS 8 device (physical or simulated, any device works), open Safari and navigate to http://jsfiddle.net/24b2eLyn/1/
2. Add to Home Screen
3. Access the installed web app
4. Notice that messages are showing up every 3 seconds
5. Lock and unlock the device
6. The messages stop appearing

The same reproduction steps in iOS 7.1 does not have the same bug - the messages continue to appear. Furthermore, running the fiddle in Safari in iOS 8 also does not exhibit the bug. It appears to be confined strictly to standalone installed web applications in iOS 8.

Expected Results:
setTimeout timers should resume after unlock, and the passed function should be called. App functionality depending on setTimeout should continue working.

Actual Results:
setTimeout timers appear to be "blown away", and further setTimeout calls are not respected.

Version:
iOS 8.0.2

Configuration:
any iOS device running iOS 8 (physical or simulated with xcode)