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Created attachment 963893 [details]
Boxes backtrace RHEL7 installation

Description of problem:
Boxes returns "GLib-GIO-CRITICAL **: g_file_get_path: assertion 'G_IS_FILE (file)' failed" after RHEL 7.0 reboot after manual installation

Version-Release number of selected component (if applicable):
gnome-boxes-3.8.3-11.el7.x86_64
libvirt-1.2.8-8.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1. Start Boxes
2. Click on "New" and then on "Continue".
3. Click on "Select a file" and set ISO location.
4. Set "Express Install" to OFF and click on "Continue".
5. Check for correct informations about the box: System, Memory and Disk.
6. Click on "Create".
7. Manually install operating system.
8. Reboot

Actual results:
During reboot (for more information see backtrace in attachment):
(gnome-boxes:7835): GLib-GIO-CRITICAL **: g_file_get_path: assertion 'G_IS_FILE (file)' failed

Program received signal SIGTRAP, Trace/breakpoint trap.

Expected results:
Box should boot into installer and after successful installation should reboot into installed operating system.

Additional info:
Maybe connection with those bugs (I am not sure):
https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=954588
https://bugzilla.redhat.com/show_bug.cgi?id=950416

no error just info:
Boxes-Message: machine.vala:153: display Microsoft Windows 7 Professional disconnected

so fixed along the way to 3.14

Verification
Package version: gnome-boxes-3.14.3.1-5.el7.x86_64

1. Start Boxes
2. Click on "New" and then on "Continue".
3. Click on "Select a file" and set ISO location.
4. Set "Express Install" to OFF and click on "Continue".
5. Check for correct informations about the box: System, Memory and Disk.
6. Click on "Create".
7. Manually install operating system.
8. Reboot


Result:
Box is booted into installer and after successful installation is rebooted into installed operating system.

Boxes-Message: machine.vala:153: display Red Hat Enterprise Linux 7.2 disconnected

According to my testing and comment 3 -> 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, 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://rhn.redhat.com/errata/RHBA-2015-2253.html