I should add that I tested kernels 5.2.15, 5.2.18 and 5.2.20 as well. All were OK, so the good-bad line is clearly after 5.2.21.
I should add that I tested kernels 5.2.15, 5.2.18 and 5.2.20 as well. All were OK, so the good-bad line is clearly after 5.2.21.