mig->nbd is initialized by qemuMigrationCookieXMLParse（called by qemuMigrationEatCookie），with a condition that
the nbd infomation contained in Cookie string. I found in debug info that qemuMigrationStartNBDServer had been called in
qemuMigrationPrepareAny（mig->nbd not null）, but at in qemuMigrationFinish qemuMigrationStopNBDServer can not really
stop nbd server bucause mig->nbd is not initialized(that is because cookie string does not contain nbd information ).
so ,there are two solutions:
1 qemuMigrationStopNBDServer ignore mig->nbd null ptr
2 add cookie info for nbd same stage (that is lost in which stage i am not sure~ )
I choose an easy way solution 1 with least code changing， maybe is not google way ：）
cookie log is like this:
2014-10-30 08:38:14.106+0000: 15078: debug : qemuMigrationRun:3254 : driver=0x7f936413cd40, vm=0x7f934400b850, cookiein=<qemu-migration>
<name>3cd4c349-e058-4a1a-8b3d-cc988efd11e2</name>
<uuid>3cd4c349-e058-4a1a-8b3d-cc988efd11e2</uuid>
<hostname>50e54929-059c-ffff-ffff-ffffffffffff_10.180.39.36</hostname>
<hostuuid>50e54929-059c-ffff-ffff-ffffffffffff</hostuuid>
<nbd port='49153'/>
</qemu-migration>
2014-10-30 08:39:12.527+0000: 15076: debug : virObjectRef:296 : OBJECT_REF: obj=0x7f9364138880
2014-10-30 08:39:12.527+0000: 15076: debug : qemuMigrationFinish:4507 : driver=0x7f936413cd40, dconn=0x7f9358002720, vm=0x7f935c002da0, cookiein=<qemu-migration>
<name>3cd4c349-e058-4a1a-8b3d-cc988efd11e2</name>
<uuid>3cd4c349-e058-4a1a-8b3d-cc988efd11e2</uuid>
<hostname>50e54929-059c-ffff-ffff-ffffffffffff_10.180.39.36</hostname>
<hostuuid>50e54929-059c-ffff-ffff-ffffffffffff</hostuuid>
<feature name='persistent'/>
<domain type='kvm'>
<name>3cd4c349-e058-4a1a-8b3d-cc988efd11e2</name>
<uuid>3cd4c349-e058-4a1a-8b3d-cc988efd11e2</uuid>
<memory unit='KiB'>2097152</memory>
<currentMemory unit='KiB'>2097152</currentMemory>
<vcpu placement='static' cpuset='0-7'>2</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-2.0'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<clock offset='localtime'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source file='/tvm/tvm/3cd4c349-e058-4a1a-8b3d-cc988efd11e2/tlinux1.2-tvm-64bit-2.2-20140716_incremental.qcow2'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source file='/tvm/tvm/3cd4c349-e058-4a1a-8b3d-cc988efd11e2/EXT3_50G.qcow2_incremental.qcow2'/>
<target dev='vdb' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</disk>
<interface type='bridge'>
<mac address='54:52:00:02:b2:32'/>
<source bridge='br1'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'>
<listen type='address' address='0.0.0.0'/>
</graphics>
<video>
<model type='cirrus' vram='9216' heads='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</memballoon>
</devices>
</domain>
<nbd/>
</qemu-migration>
, cookieinlen=2567, cookieout=0x7f93722eab08, cookieoutlen=0x7f93722eab14, flags=289, retcode=0
2014-10-31 18:05 GMT+08:00 Ján Tomko <jtomko@xxxxxxxxxx>:
On 10/31/2014 09:17 AM, weiwei li wrote:
> qemuMigrationCookiePtr mig->nbd may be null when MigrationCookie
> do not have nbd information ,but nbd port did allocated before and
> must be released here, so ignore mig->nbd null ptr and just warn.
StartNBDServer is only run when mig->nbd is present, so if it's not there we
didn't start the server or allocate the port. Are you sure this patch is
necessary?
Jan
>
> Signed-off-by: Weiwei Li <nuonuoli@xxxxxxxxxxx <mailto:nuonuoli@xxxxxxxxxxx>>
> ---
> src/qemu/qemu_migration.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
> index 0ad8054..134b041 100644
> --- a/src/qemu/qemu_migration.c
> +++ b/src/qemu/qemu_migration.c
> @@ -1584,7 +1584,7 @@ qemuMigrationStopNBDServer(virQEMUDriverPtr driver,
> qemuDomainObjPrivatePtr priv = vm->privateData;
>
> if (!mig->nbd)
> - return;
> + VIR_WARN("mig->nbd is null");
>
> if (qemuDomainObjEnterMonitorAsync(driver, vm,
> QEMU_ASYNC_JOB_MIGRATION_IN) < 0)
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