[CB-11897] cordova-plugin-wkwebview-engine crashes app on startup if Safari is set to "Automatically Show Web Inspector for JSContexts"

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 1.1.0
• Component/s: cordova-ios, cordova-plugin-wkwebview-engine

Environment

iOS

• Assignee: Shazron Abdullah
• Reporter: Brad Reynolds
• Created: 23/Sep/16 19:54
• Updated: 23/Aug/18 06:51
• Resolved: 28/Feb/17 03:41

Description

If in Safari the Simulator/iPhone is set to automatically show web inspector when the cordova-plugin-wkwebview-engine is in use the app will crash on startup.

Versions:
Safari: 10.0 (12602.1.50.0.10)
OS X: 10.12 (16A323)
Xcode: 8.0 (8A218a)
Cordova: 6.3.1
Cordova WebKit Engine: 1.1.0

To repro:
1. Create a new test app and add the cordova-plugin-wkwebview-engine plugin to it.
2. Open the iOS project in Xcode.
3. Run the Simulator.

If it didn't crash:
4. In Safari go to Develop->Simulator->Automatically Show Web Inspector for JSContexts and ensure it's checked.
5. Restart the app in Xcode. It should crash.

The output in Xcode will be something like:

testApp(3824,0x1ae6eec40) malloc: *** error for object 0x1700a7e60: pointer being freed was not allocated

• • • set a breakpoint in malloc_error_break to debug

I spent most of the day trying to repro this consistently because I was seeing the crash on my iPhone but not in the Simulator. Once I realized it was this setting I'm able to reproduce it consistently on both.

Also if you remove the CordovaWebViewEngine preference that is set to CDVWKWebViewEngine the app will not crash.