+1, I also upgraded and it broke all my network-mounted VMs.
Jul 19 08:20:49 pve1 kernel: [ 1818.227507] CIFS: VFS: \\192.168.19.10 Error -512 sending data on socket to server
Jul 19 08:20:49 pve1 kernel: [ 1818.262925] CIFS: VFS: \\192.168.19.10 Error -512 sending data on socket to server
Jul...