Custom Keyboard killed at the startup

Originator:stanislav.levental
Number:rdar://34780459 Date Originated:October 2 2017
Status:Open Resolved:
Product:iOS + SDK Product Version:11.0.1
Classification:Bug Reproducible:
 
Custom Keyboard killed with SIGQUIT by launchd process at the startup.

Steps to reproduce:
- open any custom keyboard (GBoard, SwiftKey, even simple keyboards from tutorials are affected)
- open any app that has multiple input fields
- switch to the custom keyboard and wait until it's fully loaded
- quickly switch between input fields few times
- keyboard will be killed with the following crash log description:

Exception Type:  EXC_CRASH (SIGQUIT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Termination Signal: Quit: 3
Termination Reason: Namespace SIGNAL, Code 0x3
Terminating Process: launchd [1]
Triggered by Thread:  0

Only iOS11.X is affected, previous versions worked fine.

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