Deadlock on mutation

[graylikeme]

Describe the bug
I have a case where I have to fire mutations every few seconds. In a case when there are over 2 mutations and you go to background and then back to foreground the app is being deadlocked permanently (main thread is locked). The only way to fix the deadlock is to completely remove the app from the device and then install again.

To Reproduce
Steps to reproduce the behavior:

1. Every 2 seconds fire 2 similar mutations (destroy client on entering background and recreate on getting back to foreground)
2. Transfer app to background
3. Bring the app back to the foreground
4. You should see that the interface became unresponsive and upon pausing with the debugger there should be a stack trace.

Expected behavior
Shouldn't deadlock

Screenshots

Environment(please complete the following information):

• AppSync SDK Version: [2.6.21]
• Dependency Manager: [Carthage]
• Swift Version : [4.2]

Device Information (please complete the following information):

• Device: [iPhone7]
• iOS Version: [iOS 12.0]

[larryonoff]

#109 may fix your issue

[palpatim]

This should be fixed on 2.9.0. Please let us know if you continue to have any problems.

[stale]

This issue has been automatically closed because of inactivity. Please open a new issue if are still encountering problems.