device: 0.952 network: 0.934 socket: 0.885 instruction: 0.840 graphic: 0.821 vnc: 0.779 semantic: 0.680 KVM: 0.614 boot: 0.570 mistranslation: 0.484 other: 0.445 assembly: 0.103 segmentation fault when using usb-net and -netdev tap The following command causes a Segmentation fault: qemu-kvm -usb -device usb-net,netdev=net0 -netdev tap,id=net0 Segmentation fault The following command does not: qemu-kvm -usb -device usb-net,netdev=net0 -netdev user,id=net0 Program received signal SIGSEGV, Segmentation fault. usbnet_can_receive (nc=0x55555657dc20) at /home/pbonzini/work/upstream/qemu/hw/usb/dev-network.c:1292 1292 if (is_rndis(s) && s->rndis_state != RNDIS_DATA_INITIALIZED) { First reported at https://bugzilla.redhat.com/show_bug.cgi?id=843310 Patch has been included here: http://git.qemu.org/?p=qemu.git;a=commitdiff;h=278412d0e710e2e848c ... so I think it should be OK now to close this ticket.