Created attachment 879543 [details] backtrace Description of problem: I've been running virt-test and sometimes the guest simply crash few seconds after start. It happened only on NUMA hosts. Version-Release number of selected component (if applicable): qemu-1.6.2-1.fc20.x86_64 Attaching backtrace for more information and I can also provide a coredump. command line used to start the guest: /usr/bin/qemu-system-x86_64 -machine accel=kvm -name virt-tests-vm1 -S -machine pc-i440fx-1.6,accel=kvm,usb=off -cpu Opteron_G4 -m 1024 -realtime mlock=off -smp 2,sockets=2,cores=1,threads=1 -uuid 61a42531-e412-40c1-8896-66310d089386 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/virt-tests-vm1.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -boot strict=on -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x4.0x7 -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x4 -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x4.0x1 -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x4.0x2 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -drive file=/home/virt-test/shared/data/images/jeos-19-64.qcow2,if=none,id=drive-virtio-disk0,format=qcow2 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x6,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=24,id=hostnet0,vhost=on,vhostfd=25 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:4f:50:51,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev socket,id=charchannel0,path=/var/lib/libvirt/qemu/channel/target/virt-tests-vm1.org.qemu.guest_agent.0,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7 I was not able to create a simple reproducer but I'll gladly answer any quests and also will help with debugging this crash.
This bug has been fixed in upstream http://lists.nongnu.org/archive/html/qemu-devel/2014-03/msg03776.html, commit dffacd4654ec8bf2898aed230852154c6ed755ed.
Thanks Pavel, the commit is: commit dffacd4654ec8bf2898aed230852154c6ed755ed Author: Don Slutz <dslutz> Date: Tue Mar 18 12:29:34 2014 -0400 char/serial: Fix emptyness handling
qemu-1.6.2-3.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/qemu-1.6.2-3.fc20
Package qemu-1.6.2-3.fc20: * should fix your issue, * was pushed to the Fedora 20 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing qemu-1.6.2-3.fc20' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2014-5634/qemu-1.6.2-3.fc20 then log in and leave karma (feedback).
qemu-1.6.2-4.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/qemu-1.6.2-4.fc20
qemu-1.6.2-4.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.