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Created attachment 1209425 [details] dmesg Description of problem: Boot a guest, tress guest via stress tool with command"stress --cpu 1 --io 1 --vm 1 --vm-bytes 512M",then reports:"kernel:NMI watchdog: BUG: soft lockup - CPU#5 stuck for 119s! [stress:8110]" Version-Release number of selected component (if applicable): Host install tree: RHEL7.3-20161005.0 kernel: kernel-3.10.0-512.el7 qemu: qemu-kvm-rhev-2.6.0-27.el7 SLOF: SLOF-20160223-6.gitdbbfda4.el7 Guest: RHEL7.3 BE guest with RHEL7.3-20161005.0 tree driveformat: virtio_scsi nicmodel: virtio_net mem: 16G vcpu: 16 How reproducible: 3/3 Steps to Reproduce: 1.boot a guest with qcow2 disk 2.ssh guest, then stress guest via stress tool with command"stress --cpu 1 --io 1 --vm 1 --vm-bytes 512M" Actual results: report message on terminal: [root@dhcp112-232 ~]# stress --cpu 1 --io 1 --vm 1 --vm-bytes 512M stress: info: [8109] dispatching hogs: 1 cpu, 1 io, 1 vm, 0 hdd Message from syslogd@dhcp112-232 at Oct 11 22:54:21 ... kernel:NMI watchdog: BUG: soft lockup - CPU#5 stuck for 119s! [stress:8110] Message from syslogd@dhcp112-232 at Oct 11 23:02:09 ... kernel:NMI watchdog: BUG: soft lockup - CPU#5 stuck for 134s! [stress:8110] Message from syslogd@dhcp112-232 at Oct 11 23:02:49 ... kernel:NMI watchdog: BUG: soft lockup - CPU#6 stuck for 355s! [stress:8112] Message from syslogd@dhcp112-232 at Oct 11 23:03:01 ... kernel:NMI watchdog: BUG: soft lockup - CPU#15 stuck for 354s! [swapper/15:0] Message from syslogd@dhcp112-232 at Oct 11 23:06:05 ... kernel:NMI watchdog: BUG: soft lockup - CPU#6 stuck for 338s! [stress:8112] Expected results: it should not report the bug message above Additional info: the full qemu command is as follows: /usr/libexec/qemu-kvm \ -name 'avocado-vt-vm1' \ -sandbox off \ -nodefaults \ -machine pseries-rhel7.3.0 \ -vga std \ -device virtio-serial-pci,id=virtio_serial_pci0,bus=pci.0,addr=03 \ -device virtio-scsi-pci,id=scsi1,bus=pci.0,addr=0x4 \ -chardev socket,id=devorg.qemu.guest_agent.0,path=/tmp/virtio_port-org.qemu.guest_agent.0-20160516-164929-dHQ00mMM,server,nowait \ -device virtserialport,chardev=devorg.qemu.guest_agent.0,name=org.qemu.guest_agent.0,id=org.qemu.guest_agent.0,bus=virtio_serial_pci0.0 \ -chardev socket,id=console0,path=/tmp/console0,server,nowait \ -device spapr-vty,chardev=console0 \ -device ich9-usb-ehci1,id=usb1,addr=1d.7,multifunction=on,bus=pci.0 \ -drive file=/root/RHEL7.3.qcow2,if=none,id=blk1,cache=writethrough \ -device virtio-blk-pci,scsi=off,drive=blk1,id=blk-disk1,bootindex=1 \ -drive id=drive_cd1,if=none,snapshot=off,aio=native,cache=none,media=cdrom,file=/root/RHEL7.3.iso \ -device scsi-cd,id=cd1,drive=drive_cd1,bootindex=2 \ -device virtio-net-pci,mac=9a:7b:7c:7d:7e:71,id=idtlLxAk,vectors=4,netdev=idlkwV8e,bus=pci.0,addr=05 \ -netdev tap,id=idlkwV8e,vhost=on,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown \ -m 16G \ -smp 16 \ -cpu host \ -device usb-kbd \ -device usb-mouse \ -qmp tcp:0:8881,server,nowait \ -vnc :1 \ -msg timestamp=on \ -rtc base=localtime,clock=vm,driftfix=slew \ -boot order=cdn,once=c,menu=off,strict=off \ -monitor stdio \ -enable-kvm