[libvirt] libvirt failed to spawn with namespace

[Qiao, Liyong]

Hi Michal

Build with the latest libvirt source code, I found failed to spawn a qemu process, not sure if something wrong with my environment, can you please help to take a look at it?

After build the latest (3.0.0) libvirt, found failed to start an existed domain.

root at s2600wt:/home/taget/qemu# virsh start kvm02
error: Failed to start domain kvm02
error: internal error: Process exited prior to exec: libvirt: QEMU Driver error : Unable to move /dev/mqueue mount: Invalid argument

then I found you had some code get merged, and required to use /dev/mqueue

so mount it then start the domain again:

mount -t mqueue none /dev/mqueue

root at s2600wt:/home/taget/qemu# virsh start kvm02
error: Failed to start domain kvm02
error: An error occurred, but the cause is unknown


some debug log are:

…
2017-01-05 07:48:44.195+0000: 37227: debug : virFileMakePathHelper:2899 : path=/var/run/libvirt/qemu/kvm02.dev/ mode=0777
2017-01-05 07:48:44.195+0000: 37227: debug : virFileMakeParentPath:2971 : path=/var/run/libvirt/qemu/kvm02.dev//hpet
2017-01-05 07:48:44.195+0000: 37227: debug : virFileMakePathHelper:2899 : path=/var/run/libvirt/qemu/kvm02.dev/ mode=0777
2017-01-05 07:48:44.195+0000: 37227: debug : virFileMakeParentPath:2971 : path=/var/run/libvirt/qemu/kvm02.dev//vfio/vfio
2017-01-05 07:48:44.195+0000: 37227: debug : virFileMakePathHelper:2899 : path=/var/run/libvirt/qemu/kvm02.dev//vfio mode=0777
2017-01-05 07:48:44.195+0000: 37227: debug : virFileMakePathHelper:2899 : path=/var/run/libvirt/qemu/kvm02.dev/ mode=0777
2017-01-05 07:48:44.195+0000: 37227: info : virObjectUnref:259 : OBJECT_UNREF: obj=0x7f7dc812fad0
2017-01-05 07:48:44.195+0000: 37227: debug : qemuDomainSetupAllDisks:7076 : Setting up disks
2017-01-05 07:48:44.195+0000: 37227: debug : qemuDomainSetupAllDisks:7085 : Setup all disks
2017-01-05 07:48:44.195+0000: 37227: debug : qemuDomainSetupAllHostdevs:7124 : Setting up hostdevs
2017-01-05 07:48:44.195+0000: 37227: debug : qemuDomainSetupAllHostdevs:7131 : Setup all hostdevs
2017-01-05 07:48:44.195+0000: 37227: debug : qemuDomainSetupAllChardevs:7155 : Setting up chardevs
2017-01-05 07:48:44.195+0000: 37227: debug : qemuDomainSetupAllChardevs:7163 : Setup all chardevs
2017-01-05 07:48:44.195+0000: 37227: debug : qemuDomainSetupAllInputs:7231 : Setting up disks
2017-01-05 07:48:44.195+0000: 37227: debug : qemuDomainSetupAllInputs:7238 : Setup all disks
2017-01-05 07:48:44.195+0000: 37227: debug : qemuDomainSetupAllRNGs:7270 : Setting up RNGs
2017-01-05 07:48:44.195+0000: 37227: debug : qemuDomainSetupAllRNGs:7278 : Setup all RNGs
2017-01-05 07:48:44.195+0000: 37227: debug : virFileMakePathHelper:2899 : path=/dev/pts mode=0777
2017-01-05 07:48:44.195+0000: 37227: debug : virFileMakePathHelper:2899 : path=/dev mode=0777
2017-01-05 07:48:44.195+0000: 37227: debug : virFileMakePathHelper:2899 : path=/dev/shm mode=0777
2017-01-05 07:48:44.195+0000: 37227: debug : virFileMakePathHelper:2899 : path=/dev mode=0777
2017-01-05 07:48:44.195+0000: 37227: debug : virFileMakePathHelper:2899 : path=/dev/mqueue mode=0777
2017-01-05 07:48:44.195+0000: 37227: debug : virFileMakePathHelper:2899 : path=/dev mode=0777
2017-01-05 07:48:44.195+0000: 37227: info : virObjectUnref:259 : OBJECT_UNREF: obj=0x7f7dc812fad0
2017-01-05 07:48:44.195+0000: 37227: info : virObjectUnref:259 : OBJECT_UNREF: obj=0x7f7dc812fad0
2017-01-05 07:48:44.195+0000: 37227: debug : qemuProcessHook:2693 : Hook complete ret=0
2017-01-05 07:48:44.195+0000: 37227: debug : virExec:699 : Done hook 0
2017-01-05 07:48:44.195+0000: 37227: debug : virExec:736 : Setting child uid:gid to 0:0 with caps 0
2017-01-05 07:48:44.195+0000: 37227: debug : virCommandHandshakeChild:435 : Notifying parent for handshake start on 25
2017-01-05 07:48:44.195+0000: 37227: debug : virCommandHandshakeChild:443 : Waiting on parent for handshake complete on 26
libvirt:  error : libvirtd quit during handshake: Input/output error
2017-01-05 07:48:44.216+0000: shutting down, reason=failed


/\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
I work on the latest libvirt git tree.


commit 866641d4c5706413393913fdb3bb1cd077683d21
Author: Michal Privoznik <mprivozn at redhat.com>
Date:   Sat Dec 24 17:55:48 2016 +0100

    NEWS: Update after qemu namespace fix

    Signed-off-by: Michal Privoznik <mprivozn at redhat.com>



Best Regards

Eli Qiao(乔立勇）OpenStack Core team OTC Intel.
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