Hi
This points to an issue with the Generic 10G PHY driver. The following patch seems to be missing from the 4.19 stable tree and should be merged: f802912 net: phy: genphy_10g_driver: Avoid NULL pointer dereference
But that patch says it: Fixes: 719655a14971 ("net: phy: Replace phy driver features u32 with link_mode bitmap")
Which is not in 4.19.y, it showed up in 4.20.
Ah, wait, I think that there was a patch backported to the 4.19.y queue that should not have, specifically: 3e64cf7a435e ("net: phy: phy driver features are mandatory") which said it too fixes: 719655a14971 ("net: phy: Replace phy driver features u32 with link_mode bitmap")
Hi Greg
None of these patches should be backported to v4.19. All the link mode and features stuff is v4.20 and later.
Thanks Andrew