Another user, Alex, previously reported the same phenomenon here:
https://groups.google.com/d/topic/qubes-users/Eipv3eNKzJQ/discussion
Thank you, my search fu was failing me, I though I remembered something like this already
I've begun tracking this issue here:
https://github.com/QubesOS/qubes-issues/issues/2200
We currently know very little about this issue, so I'm afraid there is
no solution yet.
Is there any information I can gather that might help before I run qvm-create-defalult-dvm?
Check file list in /var/lib/qubes/appvms/fedora-23-dvm. Especially date
and permissions of volatile.img there.
It's actually fedora-23-stable-dvm based off a copy of the template
Here is the file list, there is one noticeable difference when comparing it to fedora-23-dvm folder. For my template volatile.img is chmod 600 while it is 644 in fedora-23-dvm. Changing the permissions to match 644 does not change anything, the problem still exists
total 503544
-rw-rw-r-- 1 user qubes 1671 Jun 3 11:18 disp10.conf
-rw-rw-r-- 1 user qubes 1671 Jun 3 11:33 disp11.conf
-rw-rw-r-- 1 user qubes 1671 Jun 4 19:58 disp12.conf
-rw-rw-r-- 1 user qubes 1671 Jun 4 19:59 disp13.conf
-rw-rw-r-- 1 user qubes 1671 Jun 4 20:01 disp14.conf
-rw-rw-r-- 1 user qubes 1671 Jul 14 18:25 disp15.conf
-rw-rw-r-- 1 user qubes 1671 Jul 14 18:26 disp16.conf
-rw-rw-r-- 1 user qubes 1671 Jul 14 18:27 disp17.conf
-rw-rw-r-- 1 user qubes 1671 Jul 14 18:28 disp18.conf
-rw-rw-r-- 1 user qubes 1671 Jul 14 18:34 disp19.conf
-rw-rw-r-- 1 user qubes 1669 Jul 26 15:08 disp1.conf
-rw-rw-r-- 1 user qubes 1671 Jul 14 18:53 disp20.conf
-rw-rw-r-- 1 user qubes 1671 Jul 15 12:44 disp21.conf
-rw-rw-r-- 1 user qubes 1671 Jul 17 07:27 disp22.conf
-rw-rw-r-- 1 user qubes 1671 Jul 18 08:55 disp23.conf
-rw-rw-r-- 1 user qubes 1671 Jul 18 09:20 disp24.conf
-rw-rw-r-- 1 user qubes 1671 Jul 18 13:30 disp25.conf
-rw-rw-r-- 1 user qubes 1671 Jul 18 16:25 disp26.conf
-rw-rw-r-- 1 user qubes 1671 Jul 18 20:48 disp27.conf
-rw-rw-r-- 1 user qubes 1671 Jul 18 20:56 disp28.conf
-rw-rw-r-- 1 user qubes 1671 Jul 19 11:47 disp29.conf
-rw-rw-r-- 1 user qubes 1669 Jul 26 15:58 disp2.conf
-rw-rw-r-- 1 user qubes 1671 Jul 19 15:23 disp30.conf
-rw-rw-r-- 1 user qubes 1671 Jul 19 15:31 disp31.conf
-rw-rw-r-- 1 user qubes 1671 Jul 19 15:35 disp32.conf
-rw-rw-r-- 1 user qubes 1671 Jul 19 15:36 disp33.conf
-rw-rw-r-- 1 user qubes 1671 Jul 19 15:44 disp34.conf
-rw-rw-r-- 1 user qubes 1671 Jul 19 15:52 disp35.conf
-rw-rw-r-- 1 user qubes 1671 Jul 19 16:19 disp36.conf
-rw-rw-r-- 1 user qubes 1671 Jul 19 17:02 disp37.conf
-rw-rw-r-- 1 user qubes 1671 Jul 19 17:14 disp38.conf
-rw-rw-r-- 1 user qubes 1671 Jul 19 18:13 disp39.conf
-rw-rw-r-- 1 user qubes 1669 Jul 26 17:25 disp3.conf
-rw-rw-r-- 1 user qubes 1671 Jul 19 20:07 disp40.conf
-rw-rw-r-- 1 user qubes 1671 Jul 20 08:07 disp41.conf
-rw-rw-r-- 1 user qubes 1671 Jul 20 16:30 disp42.conf
-rw-rw-r-- 1 user qubes 1671 Jul 21 09:49 disp43.conf
-rw-rw-r-- 1 user qubes 1671 Jul 21 12:00 disp44.conf
-rw-rw-r-- 1 user qubes 1671 Jul 21 12:01 disp45.conf
-rw-rw-r-- 1 user qubes 1671 Jul 21 12:02 disp46.conf
-rw-rw-r-- 1 user qubes 1671 Jul 21 12:05 disp47.conf
-rw-rw-r-- 1 user qubes 1671 Jul 21 12:05 disp48.conf
-rw-rw-r-- 1 user qubes 1671 Jul 21 12:06 disp49.conf
-rw-rw-r-- 1 user qubes 1669 Jul 26 18:34 disp4.conf
-rw-rw-r-- 1 user qubes 1671 Jul 21 14:15 disp50.conf
-rw-rw-r-- 1 user qubes 1671 Jul 21 15:09 disp51.conf
-rw-rw-r-- 1 user qubes 1671 Jul 22 09:23 disp52.conf
-rw-rw-r-- 1 user qubes 1671 Jul 22 09:24 disp53.conf
-rw-rw-r-- 1 user qubes 1669 Jul 26 18:51 disp5.conf
-rw-rw-r-- 1 user qubes 1669 Jul 26 19:59 disp6.conf
-rw-rw-r-- 1 user qubes 1669 May 30 12:16 disp7.conf
-rw-rw-r-- 1 user qubes 1669 Jun 2 20:15 disp8.conf
-rw-rw-r-- 1 user qubes 1670 Jun 2 20:15 disp9.conf
-rw-rw-r-- 1 user qubes 309223442 Jul 21 09:49 dvm-savefile
-rw-rw-r-- 1 user qubes 1925 Jul 21 09:49 fedora-23-stable-dvm.conf
lrwxrwxrwx 1 user qubes 55 Mar 31 16:15 icon.png -> /usr/share/icons/hicolor/128x128/devices/appvm-gray.png
-rw-rw-r-- 1 user qubes 1 Jul 21 09:49 netvm-id.txt
-rw-rw---- 1 user qubes 2147483648 Jul 21 09:49 private.img
-rw-rw-r-- 1 user qubes 1024 Jul 21 09:49 saved-cows.tar
-rw------- 1 root qubes 12348030976 Jul 26 20:00 volatile.img
-rw-rw-r-- 1 user qubes 70 Mar 31 16:15 whitelisted-appmenus.list