I built the v5.5.0 version from torvalds's branch and it works.
So, if it does not work on Ubuntu's 5.4.0-48 I can assume it's was broken by some Ubuntu custom patch or some backports, making it harder for me to identify what may have introduced the regression.
I'll try to find the vanilla version that started to fail anyway, that will be helpful.
I built the v5.5.0 version from torvalds's branch and it works.
So, if it does not work on Ubuntu's 5.4.0-48 I can assume it's was broken by some Ubuntu custom patch or some backports, making it harder for me to identify what may have introduced the regression.
I'll try to find the vanilla version that started to fail anyway, that will be helpful.