qemu-kvm VM starts with kernel 5.10.10 but fails with 5.11.0-rc5. Libvirt folks think this is a kernel bug, and have attached a reproducer to the downstream bug report. "I've managed to reproduce and found that virBPFLoadProg() logs the following message: in-kernel BTF is malformed\nprocessed 0 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0\n " https://bugzilla.redhat.com/show_bug.cgi?id=1920857#c4 Thanks, -- Chris Murphy