Created attachment 141199 [details]
The graphical corruption example 1
The root cause of the bug is found and solution will be shortly.
Created attachment 141200 [details]
log with options INTEL_DEBUG=bat,buf
Pay attention that the last batch of log has an aperture with negative value "(-1023.8Mb aperture)" and this last batch does not have STATE_BASE_ADDRESS command.
The solution is suggested:
This issue was fixed by patch (2/2):
The another patch 1/2 from this series was reverted due to regression:
But anyway the patch 2/2, which was successfully accepted, fixed this bug.