Hello, I was slightly mistaken, 5.4.3 (sans rt) also shows this issue... Udo On 20-12-2019 13:29, Udo van den Heuvel wrote: > Hello, > > Just booted into 5.4.3-rt1. > I noticed that this kernel still shows some mutex-related > errors/warnings/etc during bootup. > Unfortunately these are not found in dmesg nor in /var/log/messages at > this time. > 5.4.3 (sans rt) ran without this issue for over two weeks. > > Kind regards, > Udo >