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Description of problem:
[Machines] There will be Ooops when adding watchdog to a undefined vm

Version-Release number of selected components (if applicable):
cockpit-machines-291-1.el9.noarch
cockpit-292-1.el9.x86_64
libvirt-dbus-1.4.1-5.el9.x86_64
libvirt-client-9.3.0-2.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Prepare a running vm , like cirros. 

2. Undefine it:
# virsh undefine cirros

3. Click "add" of "Watchdog", Select "Pause", then click "Add" on the dialog

There will be Ooops occurs, and the add watchdog dialog hangs there.
Close the dialog, you will find the "Reset" is added successfully.


Actual results:
See step3.


Expected results:
There should be no Ooops and the add watchdog dialog should be closed.

Additional info:

Sorry for typo, it's "Pause is added successfully" as result in step 3.

https://github.com/cockpit-project/cockpit-machines/pull/1118

Fix merged: https://github.com/cockpit-project/cockpit-machines/pull/1118

Verified with packages:
cockpit-machines-293-1.el9.noarch
cockpit-295-1.el9.x86_64
libvirt-dbus-1.4.1-5.el9.x86_64
libvirt-client-9.3.0-2.el9.x86_64

Steps to Reproduce:
1. Prepare a running vm , like cirros. 

2. Undefine it:
# virsh undefine cirros

3. Click "add" of "Watchdog", Select "Pause", then click "Add" on the dialog

"Pause" is added successfully.

So verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (cockpit-machines bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:6336