Re: [Qemu-devel] QEMU LIve Migration - swap_free: Bad swap file entry

[Orit Wasserman <owasserm@redhat.com>]

On 02/06/2014 09:20 AM, Stefan Priebe - Profihost AG wrote:
> Am 05.02.2014 21:15, schrieb Dr. David Alan Gilbert:
>> * Stefan Priebe (s.priebe@profihost.ag) wrote:
>>> Hello,
>>>
>>> after live migrating machines with a lot of memory (32GB, 48GB, ...)
>>> i see pretty often crashing services after migration and the guest
>>> kernel prints:
>>>
>>> [1707620.031806] swap_free: Bad swap file entry 00377410
>>> [1707620.031806] swap_free: Bad swap file entry 00593c48
>>> [1707620.031807] swap_free: Bad swap file entry 03201430
>>> [1707620.031807] swap_free: Bad swap file entry 01bc5900
>>> [1707620.031807] swap_free: Bad swap file entry 0173ce40
>>> [1707620.031808] swap_free: Bad swap file entry 011c0270
>>> [1707620.031808] swap_free: Bad swap file entry 03c58ae8
>>> [1707660.749059] BUG: Bad rss-counter state mm:ffff88064d09f380
>>> idx:1 val:1536
>>> [1707660.749937] BUG: Bad rss-counter state mm:ffff88064d09f380
>>> idx:2 val:-1536
>>>

Is this live migration with shared storage? what kind of shared storage?
Does this happens with smaller guests?

>>> Qemu is 1.7
>>>
>>> Does anybody know a fix?
>>
>> I don't, but some more information about:
>>      1) What guest you're running
>
> Linux guest the output is also from the guest. Kernel 3.10.26
>
>>      2) The configuration of your hosts
>
> What do you mean by that?
>
>>      3) The command line (or XML if you're running libvirt) for
>>         your qemu so we can see what devices you're running.
>
> qemu -chardev
> socket,id=qmp,path=/var/run/qemu-server/179.qmp,server,nowait -mon
> chardev=qmp,mode=control -vnc
> unix:/var/run/qemu-server/179.vnc,x509,password -pidfile
> /var/run/qemu-server/179.pid -daemonize -name K31953 -smp
> sockets=1,cores=16 -nodefaults -boot
> menu=on,strict=on,reboot-timeout=1000 -vga cirrus -cpu
> kvm64,+lahf_lm,+x2apic,+sep -k de -m 32768 -device
> piix3-usb-uhci,id=uhci,bus=pci.0,addr=0x1.0x2 -device
> usb-tablet,id=tablet,bus=uhci.0,port=1 -device
> virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 -drive
> if=none,id=drive-ide2,media=cdrom,aio=native -device
> ide-cd,bus=ide.1,unit=0,drive=drive-ide2,id=ide2,bootindex=200 -device
> virtio-scsi-pci,id=scsihw0,bus=pci.0,addr=0x5 -drive
> file=rbd:...,if=none,id=drive-scsi0,iops_rd=1000,iops_wr=500,bps_rd=314572800,bps_wr=209715200,aio=native,discard=on
> -device
> scsi-hd,bus=scsihw0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0,id=scsi0,bootindex=100
> -netdev
> type=tap,id=net0,ifname=tap179i0,script=/var/lib/qemu-server/pve-bridge,vhost=on
> -device
> virtio-net-pci,mac=CA:CA:23:AC:2D:C5,netdev=net0,bus=pci.0,addr=0x12,id=net0,bootindex=300
> -rtc base=localtime -machine type=pc-i440fx-1.7
>
>> Do you get any messages on either the source or destination
>> qemu during the migrate?
>
> no
>
> Stefan
>