Zombie VM?

Zombie VM?

[Nils Toedtmann]

I did a "xm create freebsd" and got this:

  [root@ripley ~]# xm list
  Name              Id  Mem(MB)  CPU  State  Time(s)  Console
  Domain-0           0       92    0  r----   3018.1        
  Domain-20         20       64    1  --p--      0.0        
  freebsd           20       63    1  r----  31491.5    9620
  [...]

I have no "Domain-20" configured! I'm pretty sure i did not type in "xm
create freebsd" twice, but even if, and even if the freebsd kernel is
very buggy - there should never be two VMs with the same id, right?
Looks like a bug in xend? I booted the freebsd VM several times before,
and i cannot remember this effect, but maybe i just didn't notice it.

The machine is still in this state because you may want me to run some
tests (unpausing Domain-20?). All other VMs run fine (except freebsd
going beserk again, but that's probably not xen's fault).

Here is /var/log/xend.log:

  [2005-04-12 00:35:39 xend] DEBUG (XendDomainInfo:720) init_domain>
Created domain=20 name=freebsd memory=64
  [2005-04-12 00:35:39 xend] INFO (console:94) Created console id=26
domain=20 port=9620
  [2005-04-12 00:35:39 xend] DEBUG (XendDomainInfo:1130) Creating vbd
dom=20 uname=file:/home/xen/images/freebsd-5.3-xendemo-2.0.5.test.slice
  [2005-04-12 00:35:39 xend] DEBUG (blkif:63) exception looking up
device number for hda1: [Errno 2] No such file or directory: '/dev/hda1'
  [2005-04-12 00:35:39 xend] DEBUG (blkif:155) Connecting blkif
<BlkifBackendInterface 20 0>
  [2005-04-12 00:35:39 xend] DEBUG (XendDomainInfo:1130) Creating vbd
dom=20 uname=file:/home/xen/images/freebsd-hda2.fs
  [2005-04-12 00:35:39 xend] DEBUG (blkif:63) exception looking up
device number for hda2: [Errno 2] No such file or directory: '/dev/hda2'
  [2005-04-12 00:35:39 xend] DEBUG (blkif:155) Connecting blkif
<BlkifBackendInterface 20 0>
  [2005-04-12 00:35:39 xend] DEBUG (XendDomainInfo:1107) Creating vif
dom=20 vif=0 mac=FE:FD:00:DE:AD:11
  [2005-04-12 00:35:39 xend] INFO (XendRoot:112) EVENT>
xend.console.create [26, 20, 9620]
  [2005-04-12 00:35:39 xend] INFO (XendRoot:112) EVENT>
xend.domain.create ['Domain-20', '20']
  [2005-04-12 00:35:39 xend] INFO (XendRoot:112) EVENT>
xend.domain.create ['freebsd', '20']
  [2005-04-12 00:35:40 xend] INFO (XendRoot:112) EVENT>
xend.domain.unpause ['freebsd', '20']
  [2005-04-12 00:35:41 xend] DEBUG (blkif:203) Connecting blkif to event
channel <BlkifBackendInterface 20 0> ports=28:4

Where does that "EVENT> xend.domain.create ['Domain-20', '20']" suddenly
come from?

The "exception looking up device number for hda" is not critical, that's
normal with udev on dom0.

/nils.

Re: Zombie VM?

[Kip Macy]

I've seen this before. More frequently, when domain creation fails
mid-way the tools are frequently not smart enough to clean up after
themselves and you are left with "Domain-<domain id>" in a paused
state.

I'm not sure how you'd get both a running and a paused domain with the same id.


  -Kip


On Apr 12, 2005 3:08 AM, Nils Toedtmann <xen-devel@nils.toedtmann.net> wrote:
> I did a "xm create freebsd" and got this:
> 
>   [root@ripley ~]# xm list
>   Name              Id  Mem(MB)  CPU  State  Time(s)  Console
>   Domain-0           0       92    0  r----   3018.1
>   Domain-20         20       64    1  --p--      0.0
>   freebsd           20       63    1  r----  31491.5    9620
>   [...]
> 
> I have no "Domain-20" configured! I'm pretty sure i did not type in "xm
> create freebsd" twice, but even if, and even if the freebsd kernel is
> very buggy - there should never be two VMs with the same id, right?
> Looks like a bug in xend? I booted the freebsd VM several times before,
> and i cannot remember this effect, but maybe i just didn't notice it.
> 
> The machine is still in this state because you may want me to run some
> tests (unpausing Domain-20?). All other VMs run fine (except freebsd
> going beserk again, but that's probably not xen's fault).
> 
> Here is /var/log/xend.log:
> 
>   [2005-04-12 00:35:39 xend] DEBUG (XendDomainInfo:720) init_domain>
> Created domain=20 name=freebsd memory=64
>   [2005-04-12 00:35:39 xend] INFO (console:94) Created console id=26
> domain=20 port=9620
>   [2005-04-12 00:35:39 xend] DEBUG (XendDomainInfo:1130) Creating vbd
> dom=20 uname=file:/home/xen/images/freebsd-5.3-xendemo-2.0.5.test.slice
>   [2005-04-12 00:35:39 xend] DEBUG (blkif:63) exception looking up
> device number for hda1: [Errno 2] No such file or directory: '/dev/hda1'
>   [2005-04-12 00:35:39 xend] DEBUG (blkif:155) Connecting blkif
> <BlkifBackendInterface 20 0>
>   [2005-04-12 00:35:39 xend] DEBUG (XendDomainInfo:1130) Creating vbd
> dom=20 uname=file:/home/xen/images/freebsd-hda2.fs
>   [2005-04-12 00:35:39 xend] DEBUG (blkif:63) exception looking up
> device number for hda2: [Errno 2] No such file or directory: '/dev/hda2'
>   [2005-04-12 00:35:39 xend] DEBUG (blkif:155) Connecting blkif
> <BlkifBackendInterface 20 0>
>   [2005-04-12 00:35:39 xend] DEBUG (XendDomainInfo:1107) Creating vif
> dom=20 vif=0 mac=FE:FD:00:DE:AD:11
>   [2005-04-12 00:35:39 xend] INFO (XendRoot:112) EVENT>
> xend.console.create [26, 20, 9620]
>   [2005-04-12 00:35:39 xend] INFO (XendRoot:112) EVENT>
> xend.domain.create ['Domain-20', '20']
>   [2005-04-12 00:35:39 xend] INFO (XendRoot:112) EVENT>
> xend.domain.create ['freebsd', '20']
>   [2005-04-12 00:35:40 xend] INFO (XendRoot:112) EVENT>
> xend.domain.unpause ['freebsd', '20']
>   [2005-04-12 00:35:41 xend] DEBUG (blkif:203) Connecting blkif to event
> channel <BlkifBackendInterface 20 0> ports=28:4
> 
> Where does that "EVENT> xend.domain.create ['Domain-20', '20']" suddenly
> come from?
> 
> The "exception looking up device number for hda" is not critical, that's
> normal with udev on dom0.
> 
> /nils.
> 
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