If it is apparmor that likely depends on the paths that are set up by default.
You also said you researched bug 1626972 for that workaround via the apparmor
profiles.
There are several rules for the default snapshot locations but /tmp is
usually denied as people could access your content there as well as
place arbitrary things.
I wonder if you find any DENIED messages in your dmesg that would state the
explicit path?
You might want to drop the two "deny" statements in the profile to see them
(explicit denies are not logged).
Alternatively you could even set the libvirt-qemu profile into complain mode to
get proper logs on what would be denied.
** Changed in: libvirt (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1662656
Title:
Snapshoting fails in Openstack Mitaka (KVM)
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