Apologies if this problem is known. After building qemu at ab0302ee: $ qemu-system-x86_64 -usb
qemu-system-x86_64: util/qemu-option.c:387: qemu_opt_get_bool_helper: Assertion `opt->desc && opt->desc->type == QEMU_OPT_BOOL' failed. The stack is #0 0x00007ffff1e945c9 in raise () from /lib64/libc.so.6 #1 0x00007ffff1e95cd8 in abort () from /lib64/libc.so.6 #2 0x00007ffff1e8d536 in __assert_fail_base () from /lib64/libc.so.6 #3 0x00007ffff1e8d5e2 in __assert_fail () from /lib64/libc.so.6 #4 0x00005555559660f5 in qemu_opt_get_bool_helper (opts=0x5555562b51f0, name=0x55555598a4af "usb", defval=false, del=false) at util/qemu-option.c:387 #5 0x000055555596614d in qemu_opt_get_bool (opts=0x5555562b51f0, name=0x55555598a4af "usb", defval=false) at util/qemu-option.c:397 #6 0x0000555555715d23 in usb_enabled (default_usb=false) at vl.c:1002 #7 0x000055555568d7bc in pc_init1 (machine=0x5555562c22f0, pci_enabled=1, kvmclock_enabled=1) at hw/i386/pc_piix.c:277 #8 0x000055555568d94e in pc_init_pci (machine=0x5555562c22f0) at hw/i386/pc_piix.c:308 #9 0x000055555571e8d4 in main (argc=2, argv=0x7fffffffd1d8, envp=0x7fffffffd1f0) at vl.c:4217 Bisection fingers 49d2e648. This is very visible with libvirt. Thanks Laszlo
