Comment 1 for bug 1737188

Also replied in the forums: https://forum.snapcraft.io/t/selinux-blocking-snapd-since-update-on-fedora-27/3002/2

Pulled the latest Fedora cloud image. Installed snapd and kernel-modules (to get squashfs driver). Things seem to be working just fine here:

[fedora@localhost ~]$ sudo snap install hello-world
hello-world 6.3 from 'canonical' installed
[fedora@localhost ~]$ snap list
Name Version Rev Developer Notes
core 16-2.29.4.2 3604 canonical core
hello-world 6.3 27 canonical -
[fedora@localhost ~]$ uname -a
Linux localhost.localdomain 4.14.5-300.fc27.x86_64 #1 SMP Mon Dec 11 16:00:36 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
[fedora@localhost ~]$ snap version
snap 2.29.4-2.fc27
snapd 2.29.4-2.fc27
series 16
fedora 27
kernel 4.14.5-300.fc27.x86_64
[fedora@localhost ~]$ getenforce
Enforcing

getattr getting blocked by SELinux seems to be unrelated.

Before updating the system and snapd package can you check:

- selinux is in enforcing mode
- does it still freeze if selinux is in permissive?
- long shot but check if there are unlabeled files find / -context '*unlabeled_t*',
  this should list only files under /var/lib/snapd/snap (the snaps that are installed
  and mounted)

If nothing unusual comes up, can you update the system to the latest kernel and snapd
pacakge and try again?