Re: Fail to attach CDWriter

[Mark Cave-Ayland <mark.cave-ayland@siriusit.co.uk>]

satimis@pacific.net.hk wrote:

> Hi folks
> 
> 
> KVM
> Host - Fedora 12 64bit
> VM (guest) - Windows Server 2008 64bit
> 
> 
> Fail to attach CDWriter.
> 
> 
> $ sudo virsh -c qemu:///system start vm06_wser08
> Domain vm06_wser08 started
> 
> 
> $ cat VM/DEV/cd.xml
> <disk type="block" device="cdrom">
> <target dev="hdc" bus="ide"/>
> <readonly/>
> <source dev="/dev/sr0"/>
> </disk>
> 
> 
> $ sudo virsh attach-device vm06_wser08 VM/DEV/cd.xml
> error: Failed to attach device from VM/DEV/cd.xml
> error: server closed connection
> 
> 
> $ sudo tail /var/log/messages
> Feb 19 15:45:36 localhost kernel: br0: port 2(vnet0) entering forwarding 
> state
> Feb 19 15:48:31 localhost libvirtd: 15:48:31.574: error : 
> qemudDomainChangeEjectableMedia:5186 : internal error No device with bus 
> 'ide' and target 'hdc'
> Feb 19 15:48:31 localhost kernel: libvirtd[1738]: segfault at 70 ip 
> 00000000004367e2 sp 00007f210acfc8f0 error 4 in libvirtd[400000+7f000]
> Feb 19 15:48:31 localhost abrtd: Directory 'ccpp-1266565711-1639' 
> creation detected
> Feb 19 15:48:31 localhost abrtd: Lock file 
> '/var/cache/abrt/ccpp-1266565711-1639.lock' is locked by process 21223
> Feb 19 15:48:32 localhost abrtd: Lock file 
> '/var/cache/abrt/ccpp-1266565711-1639.lock' is locked by process 21223
> Feb 19 15:48:33 localhost abrt[21223]: saved core dump of pid 1639 
> (/usr/sbin/libvirtd) to /var/cache/abrt/ccpp-1266565711-1639/coredump 
> (60129280 bytes)
> Feb 19 15:48:33 localhost abrtd: Getting local universal unique 
> identification...
> Feb 19 15:48:33 localhost abrtd: New crash, saving
> Feb 19 15:48:33 localhost abrtd: 
> RunApp('/var/cache/abrt/ccpp-1266565711-1639','test x"`cat component`" = 
> x"xorg-x11-server-Xorg" && cp /var/log/Xorg.0.log .')
> 
> 
> If I put following content on vm06_wser08 ; (cd.xml)
> <disk type="block" device="cdrom">
> <target dev="hdc" bus="ide"/>
> <readonly/>
> <source dev="/dev/sr0"/>
> </disk>
> 
> 
> Then it works.  CDWriter can be attached to Vista.  But I must insert 
> the CD on the drive before starting vm06_wser08.  Otherwises it complains.

I second this bug report. Just yesterday I tried to attach a CDROM to an 
already-running WinXP guest under qemu-0.12.1.2 with libvirt 0.7.5 using 
virt-manager 0.8.2. virt-manager immediately dropped its connection and 
refused to re-connect to the libvirtd socket. Futher investigation 
showed that the libvirtd process had died.

Restarting libvirtd, stopping the VM, attaching the CDROM again, and 
then re-starting the VM from scratch made the CDROM visible within the 
guest, suggesting there is something not quite right with the dynamic 
device attachment mechanism in libvirt.


ATB,

Mark.

-- 
Mark Cave-Ayland - Senior Technical Architect
PostgreSQL - PostGIS
Sirius Corporation plc - control through freedom
http://www.siriusit.co.uk
t: +44 870 608 0063

Sirius Labs: http://www.siriusit.co.uk/labs