Hello, These 2 errors show in dmesg late in boot process when xen domU launch: 1) blkback UBSAN: array-index-out-of-bounds in /build/linux-D15vQj/linux-6.5.0/drivers/block/xen-blkback/blkback.c:1227:4
2) netback [ 55.209063] UBSAN: array-index-out-of-bounds in /build/linux-D15vQj/linux-6.5.0/drivers/net/xen-netback/netback.c:289:3 [ 55.209268] index 3 is out of range for type 'xen_netif_tx_sring_entry [1]' [ 55.209401] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 6.5.0-9-generic #9-Ubuntu The xen sources don't seem to generate these UBSAN errors and I included the patch from staging-4.18. It seems only the xen related kernel drivers are doing UBSAN errors. BTW the dom0 works fine. The xen-4.18~rc4 debian delta was a forward port from Jammy. cheers, PryMar56 ##xen-packaging on OFTC
