Hi Same problem here. We upgraded our SAS card firmware to the latest, but it did not help. Kernel 5.10.0-18 is still working fine. We are also using Xen Virtualization. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1023183 -- Taavi Ansper taavi.ansper@cyber.ee +372 5905 2861