When building up the QEMU command line args we forgot to check for a NULL when creating the TAP device arg. This can happen if the network being connected to the VM is not running. This is something I broke in the refactoring of the ARGV construction in the QEMU driver. Dan. Index: src/qemu_conf.c =================================================================== RCS file: /data/cvs/libvirt/src/qemu_conf.c,v retrieving revision 1.76 diff -u -p -r1.76 qemu_conf.c --- src/qemu_conf.c 29 May 2008 19:20:23 -0000 1.76 +++ src/qemu_conf.c 6 Jun 2008 13:29:17 -0000 @@ -2679,8 +2679,13 @@ int qemudBuildCommandLine(virConnectPtr switch (net->type) { case QEMUD_NET_NETWORK: case QEMUD_NET_BRIDGE: - ADD_ARG(qemudNetworkIfaceConnect(conn, driver, vm, net, vlan)); - break; + { + char *tap = qemudNetworkIfaceConnect(conn, driver, vm, net, vlan); + if (tap == NULL) + goto error; + ADD_ARG(tap); + break; + } case QEMUD_NET_ETHERNET: { -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|