Just an update, I found that with different tools I was able to see a repeating 'lapic increasing min_delta_ns' scrolling furiously. I've added -no-hpet to the cmdline, but was still able to replicate it. On Tue, Jan 14, 2014 at 1:36 PM, Marcus Sorensen <shadowsor@xxxxxxxxx> wrote: > Does anyone have tips on troubleshooting live migration? I'm not sure > if this should be a qemu question or a kvm one. I've got several > E5-2650 servers running in test environment, kernel 3.10.26 and qemu > 1.7.0. If I start a VM guest (say ubuntu, debian, or centos), I can > migrate it around from host to host to host just fine, but if I wait > awhile (say 1 hour), I try to migrate and it succeeds but the guest is > hosed. No longer pings, cpu is thrashing. I've tried to strace it and > don't see anything that other working hosts aren't doing, and I've > tried gdb but I'm not entirely sure what I'm doing. I tried > downgrading to qemu 1.6.1. I've found dozens of reports of such > behavior, but they're all due to other things (migrating between > different host CPUs, someone thinking it's virtio or memballoon only > to later find a fix like changing machine type, etc). I'm at a loss. > I've tried replacing the virtio disk/network with sata/e1000, no > difference. I'm just trying to figure out where to go from here. > > I've got a core dump of the qemu process that was spinning, and I can > reproduce it fairly easily. Here's an example qemu cmdline: > > /usr/bin/qemu-system-x86_64 -machine accel=kvm -name VM12 -S -machine > pc-i440fx-1.7,accel=kvm,usb=off -m 512 -realtime mlock=off -smp > 1,sockets=1,cores=1,threads=1 -uuid > dd10a210-ab41-4cc6-a8f2-51113dd39515 -no-user-config -nodefaults > -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/VM12.monitor,server,nowait > -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc > -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 > -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x4 -drive > file=/dev/sdd,if=none,id=drive-virtio-disk0,format=raw,cache=none > -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=2 > -drive if=none,id=drive-ide0-1-0,readonly=on,format=raw,cache=none > -device ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=1 > -netdev tap,fd=29,id=hostnet0,vhost=on,vhostfd=31 -device > virtio-net-pci,netdev=hostnet0,id=net0,mac=02:00:39:28:00:01,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/VM12.agent,server,nowait > -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=VM12.vport > -device usb-tablet,id=input0 -vnc 0.0.0.0:1 -device > cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device > virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
