* Re: [Qemu-devel][bug] qemu crash when migrate vm and vm's disks
@ 2021-04-09 7:06 Yuchen
0 siblings, 0 replies; 3+ messages in thread
From: Yuchen @ 2021-04-09 7:06 UTC (permalink / raw)
To: Dr. David Alan Gilbert, pbonzini, mst; +Cc: qemu-devel
> -----邮件原件-----
> 发件人: Dr. David Alan Gilbert [mailto:dgilbert@redhat.com]
> 发送时间: 2021年4月8日 19:27
> 收件人: yuchen (Cloud) <yu.chen@h3c.com>; pbonzini@redhat.com;
> mst@redhat.com
> 抄送: qemu-devel@nongnu.org
> 主题: Re: [Qemu-devel][bug] qemu crash when migrate vm and vm's disks
>
> * Yuchen (yu.chen@h3c.com) wrote:
> > When migrate vm and vm’s disks target host qemu crash due to an invalid
> free.
> >
> > #0 object_unref (obj=0x1000) at
> > /qemu-2.12/rpmbuild/BUILD/qemu-2.12/qom/object.c:920
> > #1 0x0000560434d79e79 in memory_region_unref (mr=<optimized out>)
> > at /qemu-2.12/rpmbuild/BUILD/qemu-2.12/memory.c:1730
> > #2 flatview_destroy (view=0x560439653880) at
> > /qemu-2.12/rpmbuild/BUILD/qemu-2.12/memory.c:292
> > #3 0x000056043514dfbe in call_rcu_thread (opaque=<optimized out>)
> > at /qemu-2.12/rpmbuild/BUILD/qemu-2.12/util/rcu.c:284
> > #4 0x00007fbc2b36fe25 in start_thread () from /lib64/libpthread.so.0
> > #5 0x00007fbc2b099bad in clone () from /lib64/libc.so.6
> >
> > test base qemu-2.12.0，but use lastest qemu(v6.0.0-rc2) also reproduce.
>
> Interesting.
>
> > As follow patch can resolve this problem:
> > https://lists.gnu.org/archive/html/qemu-devel/2018-07/msg02272.html
>
> That's a pci/rcu change; ccing Paolo and Micahel.
>
> > Steps to reproduce:
> > (1) Create VM (virsh define)
> > (2) Add 64 virtio scsi disks
>
> Is that hot adding the disks later, or are they included in the VM at creation?
> Can you provide a libvirt XML example?
>
Include disks in the VM at creation
vm disks xml (only virtio scsi disks):
<devices>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native'/>
<source file='/vms/tempp/vm-os'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data1'/>
<target dev='sda' bus='scsi'/>
<address type='drive' controller='2' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data2'/>
<target dev='sdb' bus='scsi'/>
<address type='drive' controller='3' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data3'/>
<target dev='sdc' bus='scsi'/>
<address type='drive' controller='4' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data4'/>
<target dev='sdd' bus='scsi'/>
<address type='drive' controller='5' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data5'/>
<target dev='sde' bus='scsi'/>
<address type='drive' controller='6' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data6'/>
<target dev='sdf' bus='scsi'/>
<address type='drive' controller='7' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data7'/>
<target dev='sdg' bus='scsi'/>
<address type='drive' controller='8' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data8'/>
<target dev='sdh' bus='scsi'/>
<address type='drive' controller='9' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data9'/>
<target dev='sdi' bus='scsi'/>
<address type='drive' controller='10' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data10'/>
<target dev='sdj' bus='scsi'/>
<address type='drive' controller='11' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data11'/>
<target dev='sdk' bus='scsi'/>
<address type='drive' controller='12' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data12'/>
<target dev='sdl' bus='scsi'/>
<address type='drive' controller='13' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data13'/>
<target dev='sdm' bus='scsi'/>
<address type='drive' controller='14' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data14'/>
<target dev='sdn' bus='scsi'/>
<address type='drive' controller='15' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data15'/>
<target dev='sdo' bus='scsi'/>
<address type='drive' controller='16' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data16'/>
<target dev='sdp' bus='scsi'/>
<address type='drive' controller='17' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data17'/>
<target dev='sdq' bus='scsi'/>
<address type='drive' controller='18' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data18'/>
<target dev='sdr' bus='scsi'/>
<address type='drive' controller='19' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data19'/>
<target dev='sds' bus='scsi'/>
<address type='drive' controller='20' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data20'/>
<target dev='sdt' bus='scsi'/>
<address type='drive' controller='21' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data21'/>
<target dev='sdu' bus='scsi'/>
<address type='drive' controller='22' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data22'/>
<target dev='sdv' bus='scsi'/>
<address type='drive' controller='23' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data23'/>
<target dev='sdw' bus='scsi'/>
<address type='drive' controller='24' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data24'/>
<target dev='sdx' bus='scsi'/>
<address type='drive' controller='25' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data25'/>
<target dev='sdy' bus='scsi'/>
<address type='drive' controller='26' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data26'/>
<target dev='sdz' bus='scsi'/>
<address type='drive' controller='27' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data27'/>
<target dev='sdaa' bus='scsi'/>
<address type='drive' controller='28' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data28'/>
<target dev='sdab' bus='scsi'/>
<address type='drive' controller='29' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data29'/>
<target dev='sdac' bus='scsi'/>
<address type='drive' controller='30' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data30'/>
<target dev='sdad' bus='scsi'/>
<address type='drive' controller='31' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data31'/>
<target dev='sdae' bus='scsi'/>
<address type='drive' controller='32' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data32'/>
<target dev='sdaf' bus='scsi'/>
<address type='drive' controller='33' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data33'/>
<target dev='sdag' bus='scsi'/>
<address type='drive' controller='34' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data34'/>
<target dev='sdah' bus='scsi'/>
<address type='drive' controller='35' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data35'/>
<target dev='sdai' bus='scsi'/>
<address type='drive' controller='36' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data36'/>
<target dev='sdaj' bus='scsi'/>
<address type='drive' controller='37' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data37'/>
<target dev='sdak' bus='scsi'/>
<address type='drive' controller='38' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data38'/>
<target dev='sdal' bus='scsi'/>
<address type='drive' controller='39' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data39'/>
<target dev='sdam' bus='scsi'/>
<address type='drive' controller='40' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data40'/>
<target dev='sdan' bus='scsi'/>
<address type='drive' controller='41' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data41'/>
<target dev='sdao' bus='scsi'/>
<address type='drive' controller='42' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data42'/>
<target dev='sdap' bus='scsi'/>
<address type='drive' controller='43' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data43'/>
<target dev='sdaq' bus='scsi'/>
<address type='drive' controller='44' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data44'/>
<target dev='sdar' bus='scsi'/>
<address type='drive' controller='45' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data45'/>
<target dev='sdas' bus='scsi'/>
<address type='drive' controller='46' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data46'/>
<target dev='sdat' bus='scsi'/>
<address type='drive' controller='47' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data47'/>
<target dev='sdau' bus='scsi'/>
<address type='drive' controller='48' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data48'/>
<target dev='sdav' bus='scsi'/>
<address type='drive' controller='49' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data49'/>
<target dev='sdaw' bus='scsi'/>
<address type='drive' controller='50' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data50'/>
<target dev='sdax' bus='scsi'/>
<address type='drive' controller='51' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data51'/>
<target dev='sday' bus='scsi'/>
<address type='drive' controller='52' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data52'/>
<target dev='sdaz' bus='scsi'/>
<address type='drive' controller='53' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data53'/>
<target dev='sdba' bus='scsi'/>
<address type='drive' controller='54' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data54'/>
<target dev='sdbb' bus='scsi'/>
<address type='drive' controller='55' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data55'/>
<target dev='sdbc' bus='scsi'/>
<address type='drive' controller='56' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data56'/>
<target dev='sdbd' bus='scsi'/>
<address type='drive' controller='57' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data57'/>
<target dev='sdbe' bus='scsi'/>
<address type='drive' controller='58' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data58'/>
<target dev='sdbf' bus='scsi'/>
<address type='drive' controller='59' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data59'/>
<target dev='sdbg' bus='scsi'/>
<address type='drive' controller='60' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data60'/>
<target dev='sdbh' bus='scsi'/>
<address type='drive' controller='61' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data61'/>
<target dev='sdbi' bus='scsi'/>
<address type='drive' controller='62' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data62'/>
<target dev='sdbj' bus='scsi'/>
<address type='drive' controller='63' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data63'/>
<target dev='sdbk' bus='scsi'/>
<address type='drive' controller='64' bus='0' target='0' unit='0'/>
</disk>
<controller type='scsi' index='0'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x02' function='0x0'/>
</controller>
<controller type='scsi' index='1' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</controller>
<controller type='scsi' index='2' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x01' function='0x0'/>
</controller>
<controller type='scsi' index='3' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x03' function='0x0'/>
</controller>
<controller type='scsi' index='4' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x04' function='0x0'/>
</controller>
<controller type='scsi' index='5' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x05' function='0x0'/>
</controller>
<controller type='scsi' index='6' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x06' function='0x0'/>
</controller>
<controller type='scsi' index='7' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x07' function='0x0'/>
</controller>
<controller type='scsi' index='8' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x08' function='0x0'/>
</controller>
<controller type='scsi' index='9' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x09' function='0x0'/>
</controller>
<controller type='scsi' index='10' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x0a' function='0x0'/>
</controller>
<controller type='scsi' index='11' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x0b' function='0x0'/>
</controller>
<controller type='scsi' index='12' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x0c' function='0x0'/>
</controller>
<controller type='scsi' index='13' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x0d' function='0x0'/>
</controller>
<controller type='scsi' index='14' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x0e' function='0x0'/>
</controller>
<controller type='scsi' index='15' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x0f' function='0x0'/>
</controller>
<controller type='scsi' index='16' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x10' function='0x0'/>
</controller>
<controller type='scsi' index='17' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x11' function='0x0'/>
</controller>
<controller type='scsi' index='18' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x12' function='0x0'/>
</controller>
<controller type='scsi' index='19' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x13' function='0x0'/>
</controller>
<controller type='scsi' index='20' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x14' function='0x0'/>
</controller>
<controller type='scsi' index='21' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x15' function='0x0'/>
</controller>
<controller type='scsi' index='22' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x16' function='0x0'/>
</controller>
<controller type='scsi' index='23' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x17' function='0x0'/>
</controller>
<controller type='scsi' index='24' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x18' function='0x0'/>
</controller>
<controller type='scsi' index='25' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x19' function='0x0'/>
</controller>
<controller type='scsi' index='26' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x1a' function='0x0'/>
</controller>
<controller type='scsi' index='27' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x1b' function='0x0'/>
</controller>
<controller type='scsi' index='28' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x1c' function='0x0'/>
</controller>
<controller type='scsi' index='29' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x1d' function='0x0'/>
</controller>
<controller type='scsi' index='30' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x1e' function='0x0'/>
</controller>
<controller type='scsi' index='31' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x01' function='0x0'/>
</controller>
<controller type='scsi' index='32' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x0'/>
</controller>
<controller type='scsi' index='33' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x03' function='0x0'/>
</controller>
<controller type='scsi' index='34' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x04' function='0x0'/>
</controller>
<controller type='scsi' index='35' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x05' function='0x0'/>
</controller>
<controller type='scsi' index='36' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x06' function='0x0'/>
</controller>
<controller type='scsi' index='37' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x07' function='0x0'/>
</controller>
<controller type='scsi' index='38' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x08' function='0x0'/>
</controller>
<controller type='scsi' index='39' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x09' function='0x0'/>
</controller>
<controller type='scsi' index='40' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x0a' function='0x0'/>
</controller>
<controller type='scsi' index='41' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x0b' function='0x0'/>
</controller>
<controller type='scsi' index='42' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x0c' function='0x0'/>
</controller>
<controller type='scsi' index='43' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x0d' function='0x0'/>
</controller>
<controller type='scsi' index='44' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</controller>
<controller type='scsi' index='45' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
</controller>
<controller type='scsi' index='46' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0b' function='0x0'/>
</controller>
<controller type='scsi' index='47' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0c' function='0x0'/>
</controller>
<controller type='scsi' index='48' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0d' function='0x0'/>
</controller>
<controller type='scsi' index='49' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0e' function='0x0'/>
</controller>
<controller type='scsi' index='50' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0f' function='0x0'/>
</controller>
<controller type='scsi' index='51' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x10' function='0x0'/>
</controller>
<controller type='scsi' index='52' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x11' function='0x0'/>
</controller>
<controller type='scsi' index='53' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x12' function='0x0'/>
</controller>
<controller type='scsi' index='54' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x13' function='0x0'/>
</controller>
<controller type='scsi' index='55' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x14' function='0x0'/>
</controller>
<controller type='scsi' index='56' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x15' function='0x0'/>
</controller>
<controller type='scsi' index='57' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x16' function='0x0'/>
</controller>
<controller type='scsi' index='58' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x17' function='0x0'/>
</controller>
<controller type='scsi' index='59' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x18' function='0x0'/>
</controller>
<controller type='scsi' index='60' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x19' function='0x0'/>
</controller>
<controller type='scsi' index='61' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1a' function='0x0'/>
</controller>
<controller type='scsi' index='62' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1b' function='0x0'/>
</controller>
<controller type='scsi' index='63' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1c' function='0x0'/>
</controller>
<controller type='scsi' index='64' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1d' function='0x0'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='pci' index='1' model='pci-bridge'>
<model name='pci-bridge'/>
<target chassisNr='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x0'/>
</controller>
<controller type='pci' index='2' model='pci-bridge'>
<model name='pci-bridge'/>
<target chassisNr='2'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x1f' function='0x0'/>
</controller>
</devices>
vm disks xml (only virtio disks):
<devices>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native'/>
<source file='/vms/tempp/vm-os'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data2'/>
<target dev='vdb' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data3'/>
<target dev='vdc' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data4'/>
<target dev='vdd' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0b' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data5'/>
<target dev='vde' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0c' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data6'/>
<target dev='vdf' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0d' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data7'/>
<target dev='vdg' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0e' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data8'/>
<target dev='vdh' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0f' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data9'/>
<target dev='vdi' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x10' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data10'/>
<target dev='vdj' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x11' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data11'/>
<target dev='vdk' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x12' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data12'/>
<target dev='vdl' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x13' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data13'/>
<target dev='vdm' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x14' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data14'/>
<target dev='vdn' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x15' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data15'/>
<target dev='vdo' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x16' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data16'/>
<target dev='vdp' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x17' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data17'/>
<target dev='vdq' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x18' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data18'/>
<target dev='vdr' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x19' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data19'/>
<target dev='vds' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1a' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data20'/>
<target dev='vdt' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1b' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data21'/>
<target dev='vdu' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1c' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data22'/>
<target dev='vdv' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1d' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data23'/>
<target dev='vdw' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1e' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data24'/>
<target dev='vdx' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x01' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data25'/>
<target dev='vdy' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x03' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data26'/>
<target dev='vdz' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x04' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data27'/>
<target dev='vdaa' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x05' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data28'/>
<target dev='vdab' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x06' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data29'/>
<target dev='vdac' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x07' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data30'/>
<target dev='vdad' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x08' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data31'/>
<target dev='vdae' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x09' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data32'/>
<target dev='vdaf' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x0a' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data33'/>
<target dev='vdag' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x0b' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data34'/>
<target dev='vdah' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x0c' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data35'/>
<target dev='vdai' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x0d' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data36'/>
<target dev='vdaj' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x0e' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data37'/>
<target dev='vdak' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x0f' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data38'/>
<target dev='vdal' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x10' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data39'/>
<target dev='vdam' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x11' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data40'/>
<target dev='vdan' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x12' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data41'/>
<target dev='vdao' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x13' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data42'/>
<target dev='vdap' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x14' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data43'/>
<target dev='vdaq' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x15' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data44'/>
<target dev='vdar' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x16' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data45'/>
<target dev='vdas' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x17' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data46'/>
<target dev='vdat' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x18' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data47'/>
<target dev='vdau' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x19' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data48'/>
<target dev='vdav' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x1a' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data49'/>
<target dev='vdaw' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x1b' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data50'/>
<target dev='vdax' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x1c' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data51'/>
<target dev='vday' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x1d' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data52'/>
<target dev='vdaz' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x1e' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data53'/>
<target dev='vdba' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x01' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data54'/>
<target dev='vdbb' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data55'/>
<target dev='vdbc' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x03' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data56'/>
<target dev='vdbd' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x04' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data57'/>
<target dev='vdbe' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x05' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data58'/>
<target dev='vdbf' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x06' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data59'/>
<target dev='vdbg' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x07' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data60'/>
<target dev='vdbh' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x08' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data61'/>
<target dev='vdbi' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x09' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data62'/>
<target dev='vdbj' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x0a' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data63'/>
<target dev='vdbk' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x0b' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='directsync' io='native' discard='unmap'/>
<source file='/vms/tempp/vm-data1'/>
<target dev='vdbl' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</disk>
<controller type='pci' index='0' model='pci-root'/>
<controller type='pci' index='1' model='pci-bridge'>
<model name='pci-bridge'/>
<target chassisNr='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x0'/>
</controller>
<controller type='pci' index='2' model='pci-bridge'>
<model name='pci-bridge'/>
<target chassisNr='2'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x1f' function='0x0'/>
</controller>
</devices>
> > (3) migrate vm and vm’disks
>
> What do you mean by 'and vm disks' - are you doing a block migration?
>
Yes, block migration.
In fact, only migration domain also reproduced.
> Dave
>
> > ----------------------------------------------------------------------
> > ---------------------------------------------------------------
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
-------------------------------------------------------------------------------------------------------------------------------------
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel][bug] qemu crash when migrate vm and vm's disks
2021-04-08 9:04 Yuchen
@ 2021-04-08 11:27 ` Dr. David Alan Gilbert
0 siblings, 0 replies; 3+ messages in thread
From: Dr. David Alan Gilbert @ 2021-04-08 11:27 UTC (permalink / raw)
To: Yuchen, pbonzini, mst; +Cc: qemu-devel
* Yuchen (yu.chen@h3c.com) wrote:
> When migrate vm and vm’s disks target host qemu crash due to an invalid free.
>
> #0 object_unref (obj=0x1000) at /qemu-2.12/rpmbuild/BUILD/qemu-2.12/qom/object.c:920
> #1 0x0000560434d79e79 in memory_region_unref (mr=<optimized out>)
> at /qemu-2.12/rpmbuild/BUILD/qemu-2.12/memory.c:1730
> #2 flatview_destroy (view=0x560439653880) at /qemu-2.12/rpmbuild/BUILD/qemu-2.12/memory.c:292
> #3 0x000056043514dfbe in call_rcu_thread (opaque=<optimized out>)
> at /qemu-2.12/rpmbuild/BUILD/qemu-2.12/util/rcu.c:284
> #4 0x00007fbc2b36fe25 in start_thread () from /lib64/libpthread.so.0
> #5 0x00007fbc2b099bad in clone () from /lib64/libc.so.6
>
> test base qemu-2.12.0，but use lastest qemu(v6.0.0-rc2) also reproduce.
Interesting.
> As follow patch can resolve this problem:
> https://lists.gnu.org/archive/html/qemu-devel/2018-07/msg02272.html
That's a pci/rcu change; ccing Paolo and Micahel.
> Steps to reproduce:
> (1) Create VM (virsh define)
> (2) Add 64 virtio scsi disks
Is that hot adding the disks later, or are they included in the VM at
creation?
Can you provide a libvirt XML example?
> (3) migrate vm and vm’disks
What do you mean by 'and vm disks' - are you doing a block migration?
Dave
> -------------------------------------------------------------------------------------------------------------------------------------
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> 邮件！
> This e-mail and its attachments contain confidential information from New H3C, which is
> intended only for the person or entity whose address is listed above. Any use of the
> information contained herein in any way (including, but not limited to, total or partial
> disclosure, reproduction, or dissemination) by persons other than the intended
> recipient(s) is prohibited. If you receive this e-mail in error, please notify the sender
> by phone or email immediately and delete it!
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Qemu-devel][bug] qemu crash when migrate vm and vm's disks
@ 2021-04-08 9:04 Yuchen
2021-04-08 11:27 ` Dr. David Alan Gilbert
0 siblings, 1 reply; 3+ messages in thread
From: Yuchen @ 2021-04-08 9:04 UTC (permalink / raw)
To: qemu-devel
[-- Attachment #1: Type: text/plain, Size: 1804 bytes --]
When migrate vm and vm’s disks target host qemu crash due to an invalid free.
#0 object_unref (obj=0x1000) at /qemu-2.12/rpmbuild/BUILD/qemu-2.12/qom/object.c:920
#1 0x0000560434d79e79 in memory_region_unref (mr=<optimized out>)
at /qemu-2.12/rpmbuild/BUILD/qemu-2.12/memory.c:1730
#2 flatview_destroy (view=0x560439653880) at /qemu-2.12/rpmbuild/BUILD/qemu-2.12/memory.c:292
#3 0x000056043514dfbe in call_rcu_thread (opaque=<optimized out>)
at /qemu-2.12/rpmbuild/BUILD/qemu-2.12/util/rcu.c:284
#4 0x00007fbc2b36fe25 in start_thread () from /lib64/libpthread.so.0
#5 0x00007fbc2b099bad in clone () from /lib64/libc.so.6
test base qemu-2.12.0，but use lastest qemu(v6.0.0-rc2) also reproduce.
As follow patch can resolve this problem:
https://lists.gnu.org/archive/html/qemu-devel/2018-07/msg02272.html
Steps to reproduce:
(1) Create VM (virsh define)
(2) Add 64 virtio scsi disks
(3) migrate vm and vm’disks
-------------------------------------------------------------------------------------------------------------------------------------
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intended only for the person or entity whose address is listed above. Any use of the
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-04-09 7:06 [Qemu-devel][bug] qemu crash when migrate vm and vm's disks Yuchen
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2021-04-08 9:04 Yuchen
2021-04-08 11:27 ` Dr. David Alan Gilbert
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