[libvirt] attach_device incompatibility between libvirt and qemu 0.12

Hi, I have a small libvirt-tck test script, in which I create a domain without a NIC, then use attach_device to add a NIC. And then I do a ping test to the domain. This stopped working after updating to latest fedora and libvirt levels. After some hours, I now discovered that downgrading to qemu 0.11 fixes it. So there seems to be some incompatibility with qemu 0.12 and latest libvirt. The expected output with qemu-system-x86-0.11.0-12.fc12.x86_64: /usr/share/libvirt-tck/tests/scripts/network/100-ping-still-working.t .. 1..5 # Trying domain lookup by name ok 1 - the running domain object # Attaching the new interface d0:f:d0:f:2:1 ok 2 - interface has been attached # xml contains mac address element (should be 1) # 1 ok 3 - running domain has an ID > 0 # waiting for guests to boot # PING 192.168.1.101 (192.168.1.101) 56(84) bytes of data. # 64 bytes from 192.168.1.101: icmp_seq=1 ttl=64 time=2.17 ms # 64 bytes from 192.168.1.101: icmp_seq=2 ttl=64 time=0.554 ms # 64 bytes from 192.168.1.101: icmp_seq=3 ttl=64 time=0.510 ms # 64 bytes from 192.168.1.101: icmp_seq=4 ttl=64 time=0.508 ms # 64 bytes from 192.168.1.101: icmp_seq=5 ttl=64 time=0.505 ms # 64 bytes from 192.168.1.101: icmp_seq=6 ttl=64 time=0.673 ms # 64 bytes from 192.168.1.101: icmp_seq=7 ttl=64 time=0.528 ms # 64 bytes from 192.168.1.101: icmp_seq=8 ttl=64 time=0.522 ms # 64 bytes from 192.168.1.101: icmp_seq=9 ttl=64 time=0.506 ms # 64 bytes from 192.168.1.101: icmp_seq=10 ttl=64 time=0.546 ms # # --- 192.168.1.101 ping statistics --- # 10 packets transmitted, 10 received, 0% pacFor the working I see the following lines in the log: ket loss, time 9002ms # rtt min/avg/max/mdev = 0.505/0.703/2.178/0.493 ms ok 4 - ping 192.168.1.101 test # cleaning up # Detaching the 1st interface d0:f:d0:f:2:1 ok 5 - interface has been detached ok All tests successful. Files=1, Tests=5, 20 wallclock secs ( 0.02 usr 0.01 sys + 0.22 cusr 0.15 csys = 0.40 CPU) Result: PASS The failing output with qemu-system-x86-0.11.0-12.fc12.x86_64: /usr/share/libvirt-tck/tests/scripts/network/100-ping-still-working.t .. 1..5 # Trying domain lookup by name ok 1 - the running domain object # Attaching the new interface d0:f:d0:f:2:1 ok 2 - interface has been attached # xml contains mac address element (should be 1) # 1 ok 3 - running domain has an ID > 0 # waiting for guests to boot # PING 192.168.1.101 (192.168.1.101) 56(84) bytes of data. # From 192.168.1.1 icmp_seq=2 Destination Host Unreachable # From 192.168.1.1 icmp_seq=3 Destination Host Unreachable # From 192.168.1.1 icmp_seq=4 Destination Host Unreachable # From 192.168.1.1 icmp_seq=6 Destination Host Unreachable # From 192.168.1.1 icmp_seq=7 Destination Host Unreachable # From 192.168.1.1 icmp_seq=8 Destination Host Unreachable # From 192.168.1.1 icmp_seq=9 Destination Host Unreachable # From 192.168.1.1 icmp_seq=10 Destination Host Unreachable # # --- 192.168.1.101 ping statistics --- # 10 packets transmitted, 0 received, +8 errors, 100% packet loss, time 19000ms # pipe 3 not ok 4 - ping 192.168.1.101 test # Failed test 'ping 192.168.1.101 test' # at /usr/share/libvirt-tck/tests/scripts/network/100-ping-still-working.t line 82. # cleaning up # Detaching the 1st interface d0:f:d0:f:2:1 ok 5 - interface has been detached # Looks like you failed 1 test of 5. Dubious, test returned 1 (wstat 256, 0x100) Failed 1/5 subtests Test Summary Report ------------------- /usr/share/libvirt-tck/tests/scripts/network/100-ping-still-working.t (Wstat: 256 Tests: 5 Failed: 1) Failed test: 4 Non-zero exit status: 1 Files=1, Tests=5, 30 wallclock secs ( 0.02 usr 0.02 sys + 0.24 cusr 0.13 csys = 0.41 CPU) Result: FAIL I see the following in the debug log: ... qemuMonitorCommandWithHandler:216 : Send command 'getfd fd-tap.0' for write with FD 18 ... For the working qemu: qemuMonitorCommandWithHandler:221 : Receive command reply ret=0 errno=0 0 bytes '(null)' For the failing qemu: qemuMonitorCommandWithHandler:221 : Receive command reply ret=0 errno=0 44 bytes 'No file descriptor supplied via SCM_RIGHTS^M ' Any ideas? -- Best regards, Gerhard Stenzel, ----------------------------------------------------------------------------------------------------------------------------------- IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Martin Jetter Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen Registergericht: Amtsgericht Stuttgart, HRB 243294