[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[Mathias Gug]

** Changed in: libvirt (Ubuntu)
   Status: Incomplete => Invalid

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[IAN DELANEY]

Soren, or bounces,  well, despite your position that you didn't have to, you 
did it.  You were indeed right.  I'm quite happy for that too.
I did do so anyway (dom0 in xen).  That makes this not a bug and resolved and 
the deficit in my setup, perhaps an invalid status.
I could not have figured it.

ide...@karmic:~$ uname -a
Linux karmic 2.6.31-xen-r10 #6 SMP Wed Mar 3 21:31:58 WST 2010 i686 GNU/Linux
ide...@karmic:~$ ls /var/run/libvirt
libvirt-sock  libvirt-sock-ro  network  qemu

and my kernel more refined. That gives karmic a real lift.
Thanks

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[IAN DELANEY]

** Tags removed: verification-needed

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[IAN DELANEY]

yes, ok, well thanks for that.  Good comment.   I'll take note and add
it.

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Re: [Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[Soren Hansen]

On Wed, Mar 03, 2010 at 11:29:36AM -, IAN DELANEY wrote:
> Ubuntu has no support for running as a Xen dom0. This is no secret.
> When you insist on doing so anyway, don't expect us to be all over it
> trying to work out your bugs. ..
> 
> So I proceed with uncertainty.  I've not applied strace before.  However, I 
> have done as requested.
> Oh my, it is large.  The first, trace1.txt is run and aborts due to the 
> presence of the pid file, /var/run/libvirtd.pid.
> So I remove it, and re-run.  I stopped at recording over 4,000 lines, 
> trace2.txt  It's obviously repetitive.


It looks like libvirt is unhappy with your kernels lack of namespace
support:

clone(child_stack=0x9b70fe4, flags=CLONE_NEWNS|0x2c00|SIGCHLD) = -1
EINVAL (Invalid argument)

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Ubuntu Developer
http://www.ubuntu.com/

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[IAN DELANEY]

boun...@canonical, according to soren from my other bug,

Ubuntu has no support for running as a Xen dom0. This is no secret. When
you insist on doing so anyway, don't expect us to be all over it trying
to work out your bugs. ..

So I proceed with uncertainty.  I've not applied strace before.  However, I 
have done as requested.
Oh my, it is large.  The first, trace1.txt is run and aborts due to the 
presence of the pid file, /var/run/libvirtd.pid.
So I remove it, and re-run.  I stopped at recording over 4,000 lines, 
trace2.txt  It's obviously repetitive.
Anyway, 

** Attachment added: "trace2.txt"
   http://launchpadlibrarian.net/4004/trace2.txt

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[Soren Hansen]

Can you try running libvirtd through strace?

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[IAN DELANEY]

** Tags added: verification-needed

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[IAN DELANEY]

libvirt is running in dom0.

ide...@karmic64:~$ uname -a
 Linux karmic64 2.6.31-xen-r10-AMD-64 #19 SMP Sun Feb 28 21:28:33 WST 2010 
x86_64 GNU/Linux

Host.  libvirt is intended for a host environment.  Wouldn't be inclined to 
install it into a guest.
It's all very well me confirming myself.  Can someone confirm???

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[Soren Hansen]

Are you running libvirt in a dom0 or domU?

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[IAN DELANEY]

ok, you're going to hate me for this, I know it.  As if I've not input enough.  
I did do a separate install of karmic,
and I reproduced this state.  I installed a 64 version.

I installed, prepared the kernel for karmic.  Unless I missed it, Ubuntu
didn't provide a xen kernel for karmic.  I provided my own, and it's run
lenny 64, karmic 32, now karmic 64, gentoo 32 and gentoo 64.  It may not
be perfect.  Anyway, having booted into xen.

ide...@karmic64:~$ sudo libvirtd
[sudo] password for idella: 
22:58:12.769: error : qemudWritePidFile:457 : Failed to open pid file 
'/var/run/libvirtd.pid' : File exists
ide...@karmic64:~$ ls /var/run/libvirt
qemu
ide...@karmic64:~$ sudo rm /var/run/libvirtd.pid
ide...@karmic64:~$ sudo libvirtd
libvir: Network Config error : cannot enable 
/proc/sys/net/ipv6/conf/virbr0/disable_ipv6: No such file or directory
23:00:47.610: warning : qemudStartup:521 : Unable to create cgroup for driver: 
No such device or address
Segmentation fault
ide...@karmic64:~$ ls /var/run/libvirt
qemu
ide...@karmic64:~$ uname -a
Linux karmic64 2.6.31-xen-r10-AMD-64 #19 SMP Sun Feb 28 21:28:33 WST 2010 
x86_64 GNU/Linux

More of the same.  Installed virt-manager, try connecting to xen by gui,

Unable to open connection to hypervisor URI 'xen:///':
 unable to connect to 
'/var/run/libvirt/libvirt-sock': No such file or directory

I booted into the freshly installed server kernel, and

ide...@karmic64:~$ sudo libvirtd
[sudo] password for idella: 
Sorry, try again.
[sudo] password for idella: 
22:39:18.849: error : qemudWritePidFile:457 : Failed to open pid file 
'/var/run/libvirtd.pid' : File exists
ide...@karmic64:~$ sudo rm /var/run/libvirtd.pid
ide...@karmic64:~$ sudo libvirtd
22:39:39.118: warning : qemudStartup:521 : Unable to create cgroup for driver: 
No such device or address
22:39:39.204: warning : lxcStartup:1460 : Unable to create cgroup for driver: 
No such device or address
WARNING: Unhandled message: interface=org.freedesktop.DBus.Introspectable, 
path=/, member=Introspect

^X^Z
[1]+  Stopped sudo libvirtd
ide...@karmic64:~$ sudo libvirtd
22:40:21.411: error : qemudWritePidFile:457 : Failed to open pid file 
'/var/run/libvirtd.pid' : File exists
ide...@karmic64:~$ ls /var/run/libvirt
libvirt-sock  libvirt-sock-ro  network  qemu
ide...@karmic64:~$ uname -a
Linux karmic64 2.6.31-19-server #56-Ubuntu SMP Thu Jan 28 03:40:48 UTC 2010 
x86_64 GNU/Linux

Those elusive sockets libvirt-sock  libvirt-sock-ro are there, in an
environment absent of xen.

Yes well, I fear this may lead nowhere if you can't reproduce.  What
kernel would you use??

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[IAN DELANEY]

I decided to up the level of input.  Please persevere.

ide...@karmic:~$ sudo rm /var/run/libvirtd.pid
ide...@karmic:~$ sudo gdb libvirtd
GNU gdb (GDB) 7.0-ubuntu
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
...
Reading symbols from /usr/sbin/libvirtd...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/sbin/libvirtd 
[Thread debugging using libthread_db enabled]
20:11:17.815: warning : qemudStartup:521 : Unable to create cgroup for driver: 
No such device or address

Program received signal SIGSEGV, Segmentation fault.
virDomainEventCallbackListFree (list=0x0) at domain_event.c:41
41  domain_event.c: No such file or directory.
in domain_event.c
(gdb) bt
#0  virDomainEventCallbackListFree (list=0x0) at domain_event.c:41
#1  0x0808bece in ?? ()
#2  0x0808f992 in ?? ()
#3  0xb7e8a915 in virStateInitialize (privileged=1) at libvirt.c:786
#4  0x0805b5eb in ?? ()
#5  0xb7a1bb56 in __libc_start_main () from /lib/tls/i686/nosegneg/libc.so.6
#6  0x08053d11 in ?? ()

comment:  I suspect this relates to attempting to qemu /kvm, which it
can't connect to in this xen environ.

ide...@karmic:~$ gdb virsh
GNU gdb (GDB) 7.0-ubuntu
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
...
Reading symbols from /usr/bin/virsh...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/bin/virsh 
[Thread debugging using libthread_db enabled]
Connecting to uri: qemu:///session
  (Here it hangs, I interrupt)
^Z
Program received signal SIGTSTP, Stopped (user).
0xb7fe2416 in __kernel_vsyscall ()
(gdb) run -c qemu:///system
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /usr/bin/virsh -c qemu:///system
[Thread debugging using libthread_db enabled]
Connecting to uri: qemu:///system
error: unable to connect to '/var/run/libvirt/libvirt-sock': No such file or 
directory
error: failed to connect to the hypervisor

Program exited with code 01.
(gdb) run -c xen
Starting program: /usr/bin/virsh -c xen
[Thread debugging using libthread_db enabled]
Connecting to uri: xen
error: unable to connect to '/var/run/libvirt/libvirt-sock': No such file or 
directory
error: failed to connect to the hypervisor

Program exited with code 01.

however

ide...@karmic:~$ sudo gdb virsh
GNU gdb (GDB) 7.0-ubuntu
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
...
Reading symbols from /usr/bin/virsh...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/bin/virsh 
[Thread debugging using libthread_db enabled]
Connecting to uri: qemu:///session
error: unable to connect to '/var/run/libvirt/libvirt-sock': No such file or 
directory
error: failed to connect to the hypervisor

Program exited with code 01.
(gdb) run -c xen
Starting program: /usr/bin/virsh -c xen
[Thread debugging using libthread_db enabled]
Connecting to uri: xen
[New Thread 0xb78d5b70 (LWP 14327)]
Welcome to virsh, the virtualization interactive terminal.

Type:  'help' for help with commands
   'quit' to quit

virsh #

It goes in.   virt-manager responds similarly.  Does connect using sudo, or 
gksu, which does make sense.
I think I'm going to install a whole separate 64 version and duplicate this 
setup and see what it yields.
It's just paralised the way it is.

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[IAN DELANEY]

Chuck Short,  I hope to hear from you again, I can see you are a key 
participant in dealing with these bugs.
It's Saturday now so I suppose I can't expect you to reply before Monday, and 
you are busy I'm sure.
>From what I've gleaned, you're not going to reproduce. The sockets are so 
>fundamental that they surely would have been reported as a bug by someone else 
>by now.  So I suppose it follows that is is low priority at your end.  But 
>something has gone awry.  I would hope for you to grant it some input so as to 
>finally achieve a sane setup on my karmic.

I've pursued libvirt quite a bit, on lenny for extended periods, and gentoo.  
http://bugs.gentoo.org/show_bug.cgi?id=305401
This flaw leaves my completely puzzled, short of being fluent in python 
programming, there is nowhere to go with it.  From what I've read, creating the 
sockets and assigning permissions is one of the first things executed by 
libvirtd.  How can this sytem do anything without them?  i.e. Why does virsh 
connect to xen in their absence?

The only link to xen I can trace that might bear some influence I've
already mentioned.  In xend-config.sxp, one of the fundamental choices
to select is the type of server.  The choice of

(xend-http-server yes)
(xend-port 8000)

finally allowed connectivity.  The promoted selection is (xend-unix-server 
yes), which I have just tried.  It is absent as a selection in the 
xend-config.sxp, so I had to manually add it.  It also works, but leaves me 
wondering,
why is this selection absent?
what is a recommended standard setup for karmic with its standard packages? 
It's too intricate for me.

** Bug watch added: Gentoo Bugzilla #305401
   http://bugs.gentoo.org/show_bug.cgi?id=305401

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[IAN DELANEY]

Thanks for answering so quickly.  The output should be

ide...@karmic:~/Documents$ ls /var/run/libvirt
qemu

It needs to list the sockets  as listed above.

libvir: Remote error : unable to connect to '/var/run/libvirt/libvirt-sock-ro': 
No such file or directory
libvir: Remote error : unable to connect to '/var/run/libvirt/libvirt-sock-ro': 
No such file or 

and '/var/run/libvirt/libvirt-sock-rw.

I can only say I've installed it and unistalled it a number of times, trying to 
get a workable state.
I've determined these are key components to libvirt.
In a regular kernel booted environment, they are made.  It is sane
That's what so ridiculous about this.   It's occuring in a xen environment, NOT 
a regular kernel.  How can xend or such interfere?

I can't understand why libvirt actually connects to xen at all!  There
should be set of sockets under ~/.libvirt too, but bo.

ide...@karmic:~$ ls .libvirt
qemu  storage

Not there.  Their absence is undermining every other thing that libvirt
interacts with re virtinst and virt-manager, as I described above.  It
doesn't surprise me that it doesn't reproduce.  I think something has
gone haywire on my setup, but they are all standard packages installed
in a standard way.  I've just relied on re-installing to straighten it
out, but no.  Maybe can't be reproduced which is unfortunate on my part,
since it still needs to be debugged.

Key points, occurs in a xen environment, wrecks most everything else.
Nothing radical in /etc/libvirt/libvirtd.conf

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[Chuck Short]

I am not able to reproduce. Can you give the output of /var/run/ibvirt?

Thanks
chuck

** Changed in: libvirt (Ubuntu)
   Importance: Undecided => Low

** Changed in: libvirt (Ubuntu)
   Status: New => Incomplete

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[Bug 527875] Re: libvirt0 unable to operate due to missing essential files

[IAN DELANEY]

** Attachment added: "Dependencies.txt"
   http://launchpadlibrarian.net/39783236/Dependencies.txt

** Attachment added: "XsessionErrors.txt"
   http://launchpadlibrarian.net/39783237/XsessionErrors.txt

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