Description of problem:
On Fedora 27, after the last software update of yesterday, Spotify (under snapd) stopped working. 
When I start spotify from the terminal, I receive this error: cannot create tmpfs target /tmp/snap.rootfs_Gc6HQN/var/lib/snapd/lib/vulkan: No such file or directory
I tried to snap remove spotify , and then snap install spotify. When the install runs, a lot of SElinux errors are thrown, including the one of this bug report.
This was not happening with the previous version of snapd.
SELinux is preventing snap-discard-ns from read, write access on the file spotify.lock.

*****  Plugin catchall (100. confidence) suggests   **************************

If you believe that snap-discard-ns should be allowed read write access on the spotify.lock file by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# ausearch -c 'snap-discard-ns' --raw | audit2allow -M my-snapdiscardns
# semodule -X 300 -i my-snapdiscardns.pp

Additional Information:
Source Context                system_u:system_r:snappy_t:s0
Target Context                unconfined_u:object_r:var_run_t:s0
Target Objects                spotify.lock [ file ]
Source                        snap-discard-ns
Source Path                   snap-discard-ns
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-283.21.fc27.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Permissive
Host Name                     (removed)
Platform                      Linux (removed) 4.14.14-300.fc27.x86_64 #1 SMP Fri
                              Jan 19 13:19:54 UTC 2018 x86_64 x86_64
Alert Count                   1
First Seen                    2018-01-31 23:05:17 CET
Last Seen                     2018-01-31 23:05:17 CET
Local ID                      576f2c68-f09b-428d-91c4-a2de490f611a

Raw Audit Messages
type=AVC msg=audit(1517436317.34:425): avc:  denied  { read write } for  pid=21768 comm="snap-discard-ns" name="spotify.lock" dev="tmpfs" ino=126399 scontext=system_u:system_r:snappy_t:s0 tcontext=unconfined_u:object_r:var_run_t:s0 tclass=file permissive=1


Hash: snap-discard-ns,snappy_t,var_run_t,file,read,write

Version-Release number of selected component:
selinux-policy-3.13.1-283.21.fc27.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.9.3
hashmarkername: setroubleshoot
kernel:         4.14.14-300.fc27.x86_64
type:           libreport