Description of problem: Increase active CPUs form 1 to 2 Version-Release number of selected component: qemu-system-x86-1.2.2-6.fc18 Additional info: backtrace_rating: 4 cmdline: /usr/bin/qemu-kvm -name Dunk03 -S -M pc-0.15 -cpu kvm32,+wdt,+skinit,+ibs,+osvw,+3dnowprefetch,+cr8legacy,+extapic,+cmp_legacy,+3dnow,+3dnowext,+pdpe1gb,+fxsr_opt,+mmxext,+ht,+vme -enable-kvm -m 2048 -smp 1,maxcpus=2,sockets=2,cores=1,threads=1 -uuid 3c8b103e-97ab-64ab-bb7c-4535fd85eb76 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/Dunk03.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x9.0x7 -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x9 -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x9.0x1 -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x9.0x2 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -drive file=/var/lib/libvirt/images/Dunk03.img,if=none,id=drive-virtio-disk0,format=raw,cache=writethrough -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive if=none,id=drive-ide0-1-0,readonly=on,format=raw,cache=writethrough -device ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=23,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:8d:05:c8,bus=pci.0,addr=0x3 -netdev tap,fd=26,id=hostnet1 -device rtl8139,netdev=hostnet1,id=net1,mac=52:54:00:47:f1:d9,bus=pci.0,addr=0x8 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev spicevmc,id=charchannel0,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0 -device usb-tablet,id=input0 -spice port=5902,addr=0.0.0.0,disable-ticketing -vga qxl -global qxl-vga.vram_size=67108864 -device AC97,id=sound0,bus=pci.0,addr=0x4 -device usb-host,hostbus=5,hostaddr=2,id=hostdev0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 crash_function: bus_add_child executable: /usr/bin/qemu-kvm kernel: 3.6.11-1.fc17.x86_64 remote_result: NOTFOUND uid: 107 var_log_messages: Feb 23 17:38:57 Host01 abrt[13280]: Saved core dump of pid 12960 (/usr/bin/qemu-kvm) to /var/spool/abrt/ccpp-2013-02-23-17:38:22-12960 (2495234048 bytes) Truncated backtrace: Thread no. 1 (10 frames) #4 bus_add_child at hw/qdev.c:86 #5 qdev_set_parent_bus at hw/qdev.c:104 #6 qdev_try_create at hw/qdev.c:143 #7 qdev_create at hw/qdev.c:114 #8 apic_init at /usr/src/debug/qemu-kvm-1.2.0/hw/pc.c:883 #9 pc_new_cpu at /usr/src/debug/qemu-kvm-1.2.0/hw/pc.c:935 #10 qemu_system_cpu_hot_add at /usr/src/debug/qemu-kvm-1.2.0/hw/acpi_piix4.c:638 #11 handle_user_command at /usr/src/debug/qemu-kvm-1.2.0/monitor.c:4201 #12 qmp_human_monitor_command at /usr/src/debug/qemu-kvm-1.2.0/monitor.c:662 #13 qmp_marshal_input_human_monitor_command at qmp-marshal.c:1441
Created attachment 701798 [details] File: backtrace
Created attachment 701799 [details] File: build_ids
Created attachment 701800 [details] File: cgroup
Created attachment 701801 [details] File: core_backtrace
Created attachment 701802 [details] File: dso_list
Created attachment 701803 [details] File: environ
Created attachment 701804 [details] File: limits
Created attachment 701805 [details] File: maps
Created attachment 701806 [details] File: open_fds
Created attachment 701807 [details] File: proc_pid_status
Created attachment 701808 [details] File: smolt_data
Unfortunately I think hotplugging cpus is just one of those things that doesn't work with F18 vintage qemu. Upstream is just finishing up the infrastructure now as I understand it.
Just closing this as cantfix for F18 since it will likely never be fixed there, trying rawhide is probably more interesting.