Open Stack

Seems like qemu doesn't have the privileges to read /sys/kernel/debug/tracing/tracing_on



From: Arindam Choudhury [mailto:arindam at live.com]
Sent: 04 March 2014 15:15
To: Parthipan, Loganathan; openstack at lists.openstack.org
Subject: RE: [Openstack] Error mounting disk with libguestfs (child process died unexpectedly)

Hi,
both
/sys/kernel/debug/tracing/tracing_on
/sys/kernel/debug/tracing/events/kvm/enable is 1.

The logs are:

libvirtd-debug<http://paste.openstack.org/raw/72197/> (sorry for lots of garbage in this file)

/var/log/messages<http://paste.openstack.org/raw/72198/>

instance.log<http://paste.openstack.org/raw/72205/>

After disabling tracing_on and tracing kvm events, it gave the same error.

Regards,
Arindam

________________________________
From: parthipan at hp.com
To: arindam at live.com
Subject: RE: [Openstack] Error mounting disk with libguestfs (child process died unexpectedly)
Date: Tue, 4 Mar 2014 14:07:31 +0000
If you can that'll be great. Thanks.

Also what's in

/sys/kernel/debug/tracing/tracing_on
/sys/kernel/debug/tracing/events/kvm/enable

Try running after
echo 0 > /sys/kernel/debug/tracing/tracing_on

If there's no improvement try - although I don't know what it really does (I need to read the code)
echo 0 > /sys/kernel/debug/tracing/events/kvm/enable

I'm just wondering if it's due to some permission/ACL issues when trying to write into debugfs using ftrace, given your observation on different tracing backends.

Thanks for reporting and spending time on this.

Cheers
~parthi


From: Arindam Choudhury [mailto:arindam at live.com]
Sent: 04 March 2014 13:27
To: Parthipan, Loganathan
Subject: RE: [Openstack] Error mounting disk with libguestfs (child process died unexpectedly)

Hi,

Its a multi-node deployment with nova-network.

If you want I can recreate the error and send you the logs.

Regards,
________________________________
From: parthipan at hp.com
To: arindam at live.com
Subject: RE: [Openstack] Error mounting disk with libguestfs (child process died unexpectedly)
Date: Tue, 4 Mar 2014 13:21:24 +0000
Interesting...

Is it a single node deployment? Do you have any other log data such as libvirt_debug.log, libvirt/qemu/instance-xxxx.log? Any errors/warnings during the time of instance creation in syslog?

From: Arindam Choudhury [mailto:arindam at live.com]
Sent: 04 March 2014 12:56
To: Parthipan, Loganathan
Subject: RE: [Openstack] Error mounting disk with libguestfs (child process died unexpectedly)


it only happens when I enable

--enable-trace-backend=ftrace

with
--enable-trace-backend=simple

works fine.

________________________________
From: parthipan at hp.com
To: arindam at live.com
Subject: RE: [Openstack] Error mounting disk with libguestfs (child process died unexpectedly)
Date: Tue, 4 Mar 2014 12:33:55 +0000
Also check if it's a cgroups issue since the binary location changed. You could look at the syslog and kern.log


From: Parthipan, Loganathan
Sent: 04 March 2014 12:15
To: 'Arindam Choudhury'; openstack at lists.openstack.org
Subject: RE: [Openstack] Error mounting disk with libguestfs (child process died unexpectedly)

Reading your log, I don't think the problem is due to injection failure at libguestfs. It's a warning and is ignored.

Seems more like a network setup issue. Are you using neutron? Is the network/subnet etc setup properly?

From: Arindam Choudhury [mailto:arindam at live.com]
Sent: 04 March 2014 11:50
To: Parthipan, Loganathan; openstack at lists.openstack.org
Subject: RE: [Openstack] Error mounting disk with libguestfs (child process died unexpectedly)

Hi Parthipan,

When I try to do yum remove python-libguestfs.
It also wants to remove openstack-nova-compute. So, I can not.

Regards,
Arindam
________________________________
From: parthipan at hp.com
To: arindam at live.com; openstack at lists.openstack.org
Subject: RE: [Openstack] Error mounting disk with libguestfs (child process died unexpectedly)
Date: Tue, 4 Mar 2014 11:23:50 +0000
Arindam,

What happens if you 'apt-get remove python-guestfs' and try? I'd expect it to fallback to nbdmount.


From: Arindam Choudhury [mailto:arindam at live.com]
Sent: 04 March 2014 10:40
To: openstack at lists.openstack.org
Subject: [Openstack] Error mounting disk with libguestfs (child process died unexpectedly)

Hi,
I have a working Openstack Grizzly setup with nova-network on Scientific Linux. As, SL comes with a old qemu:

qemu-kvm-0.12.1.2-2.355.el6_4.6.x86_64

I am trying to upgrade it to qemu-1.7.0 from source.

The configuration output<http://pastebin.com/raw.php?i=geEEXm79>.

As, openstack use /usr/libexec/qemu-kvm to start up VM, i linked
qemu-kvm to qemu-system-x86_64:
ls -l /usr/libexec/qemu-kvm lrwxrwxrwx 1 root root 33 Feb 19 15:25 /usr/libexec/qemu-kvm -> /usr/local/bin/qemu-system-x86_64

But when I try to start VM, I get following error:

WARNING nova.virt.disk.api [req-7dfd6cf1-db21-403d-abbf-ccb5f0273a6a
b829b65d0675416198f9e4838b5009e2 9a2e060772204260b53b52ea1c12db97]
Ignoring error injecting data into image
(Error mounting /var/lib/nova/instances/07c0898e-7d75-448d-b4fe-2c37f681b846/disk
with libguestfs (child process died unexpectedly))

The full error log is here<http://pastebin.com/raw.php?i=FD8N47mk>.

Output of libguestfs-test-tool is here<http://pastebin.com/raw.php?i=EKWQWH1y>.

Regards,
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