After updating to Avast Free version 18.3.2333 (build 18.3.3860.316) I started seeing the following errors in my event logs close to 1 minute after each boot:
Warning, Kernel-EventTracing Event ID 4
The maximum file size for session “Circular Kernel Context Logger” has been reached. As a result, events might be lost (not logged) to file “C:\WINDOWS\system32\WDI\LogFiles\BootCKCL.etl”. The maximum files size is currently set to 104857600 bytes.
Error, Kernel-EventTracing Event ID 3
Session “Circular Kernel Context Logger” stopped due to the following error: 0xC0000188
When the error occurred, I found that the C:\Windows\System32\WDI\LogFiles\BootCKCL.etl was 100MB in size.
I have isolated it to the Cleanup component. After I uninstalled the component, the errors disappeared and the BootCKCL.etl file was only about 32MB.