Virtual Machine Manager error when add a new virtual machine

[bizar]

Hi all
I try to install a new virtual machine and I get this error can some one help me please.

Here is the error title

Unable to complete install: 'internal error unable to start guest: qemu: could not open monitor device 'pty'
'

And here are the details

Unable to complete install '<class 'libvirt.libvirtError'> internal error unable to start guest: qemu: could not open monitor device 'pty'

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/create.py", line 1501, in do_install
    dom = guest.start_install(False, meter = meter)
  File "/usr/lib/python2.6/site-packages/virtinst/Guest.py", line 541, in start_install
    return self._do_install(consolecb, meter, removeOld, wait)
  File "/usr/lib/python2.6/site-packages/virtinst/Guest.py", line 633, in _do_install
    self.domain = self.conn.createLinux(install_xml, 0)
  File "/usr/lib/python2.6/site-packages/libvirt.py", line 974, in createLinux
    if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self)
libvirtError: internal error unable to start guest: qemu: could not open monitor device 'pty'

Thanks in advanced.
Best Regards.

[dtseiler]

I have the same problem here.

Unable to complete install '<class 'libvirt.libvirtError'> internal error unable to start guest: qemu: could not open monitor device 'pty'

Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/create.py", line 1497, in do_install
dom = guest.start_install(False, meter = meter)
File "/usr/lib/python2.6/site-packages/virtinst/Guest.py", line 541, in start_install
return self._do_install(consolecb, meter, removeOld, wait)
File "/usr/lib/python2.6/site-packages/virtinst/Guest.py", line 633, in _do_install
self.domain = self.conn.createLinux(install_xml, 0)
File "/usr/lib64/python2.6/site-packages/libvirt.py", line 974, in createLinux
if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self)
libvirtError: internal error unable to start guest: qemu: could not open monitor device 'pty'

Any fix?

FWIW, I'm on Fedora 11, dual-headed display on my desktop.

[dtseiler]

Looks like the problem is SELinux. I noticed alerts about qemu trying to use terminal. Here are the two alerts that were genearted at the same time:

Summary:

SELinux is preventing qemu-system-x86 (svirt_t) "setrlimit" svirt_t.

Detailed Description:

SELinux denied access requested by qemu-system-x86. It is not expected that this
access is required by qemu-system-x86 and this access may signal an intrusion
attempt. It is also possible that the specific version or configuration of the
application is causing it to require additional access.

Allowing Access:

You can generate a local policy module to allow this access - see FAQ
(http://fedora.redhat.com/docs/selinu...fc5/#id2961385) Or you can disable
SELinux protection altogether. Disabling SELinux protection is not recommended.
Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi)
against this package.

Summary:

SELinux prevented pt_chown from using the terminal 1.

Detailed Description:

SELinux prevented pt_chown from using the terminal 1. In most cases daemons do
not need to interact with the terminal, usually these avc messages can be
ignored. All of the confined daemons should have dontaudit rules around using
the terminal. Please file a bug report
(http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this selinux-policy.
If you would like to allow all daemons to interact with the terminal, you can
turn on the allow_daemons_use_tty boolean.

Allowing Access:

Changing the "allow_daemons_use_tty" boolean to true will allow this access:
"setsebool -P allow_daemons_use_tty=1."

Fix Command:

setsebool -P allow_daemons_use_tty=1

[dtseiler]

Confirmed that I can disable SELinux and virt-manager is able to create the instance.