Please queue up the attached backport of commit 2351c88f8296 "watchdog:
Fix the race between the release of watchdog_core_data and cdev" for
4.14.

Ben.

-- 
Ben Hutchings, Software Developer                         Codethink Ltd
https://www.codethink.co.uk/                 Dale House, 35 Dale Street
                                     Manchester, M1 2HF, United Kingdom