Steps to reproduce the problem:
1. Create a signed apk 
2. Update from a previous signed apk
3. call from the UI thread:
new WebView(context)

What is the expected behavior?
a webview is created

What went wrong?
Deadlock, see traces file attached

Crashed report ID: 

How much crashed? Just one tab

Is it a problem with a plugin? No 

Did this work before? N/A 

Chrome version: 49.0.2623.91  Channel: stable
OS Version: 5.1.1
Flash Version: -

This happens only when updating a signed apk.
Recreates almost consistently.
The stack originates from MoPub's code, calling:
userAgent = new WebView(context).getSettings().getUserAgentString();
See here: https://github.com/mopub/mopub-android-sdk/blob/f5154c436d761bea2c75b7fc2436efda6853b2e4/mopub-sdk/src/main/java/com/mopub/network/Networking.java#L133

but their code looks ok, and shouldn't deadlock.

Waited for over 10 minutes multiple times, and it never returns, causing a white screen that isn't responsive.
 

Deleted: traces.txt 365 KB

traces.txt 365 KB View Download