Description of problem:
reboot after dnf update
SELinux is preventing gnome-shell from 'map' accesses on the file /memfd:wayland-cursor (deleted).

*****  Plugin restorecon (92.2 confidence) suggests   ************************

If you want to fix the label. 
/memfd:wayland-cursor (deleted) default label should be etc_runtime_t.
Then you can run restorecon. The access attempt may have been stopped due to insufficient permissions to access a parent directory in which case try to change the following command accordingly.
Do
# /sbin/restorecon -v /memfd:wayland-cursor (deleted)

*****  Plugin catchall_boolean (7.83 confidence) suggests   ******************

If you want to allow domain to can mmap files
Then you must tell SELinux about this by enabling the 'domain_can_mmap_files' boolean.

Do
setsebool -P domain_can_mmap_files 1

*****  Plugin catchall (1.41 confidence) suggests   **************************

If you believe that gnome-shell should be allowed map access on the memfd:wayland-cursor (deleted) 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 'gnome-shell' --raw | audit2allow -M my-gnomeshell
# semodule -X 300 -i my-gnomeshell.pp

Additional Information:
Source Context                system_u:system_r:xdm_t:s0-s0:c0.c1023
Target Context                system_u:object_r:tmpfs_t:s0
Target Objects                /memfd:wayland-cursor (deleted) [ file ]
Source                        gnome-shell
Source Path                   gnome-shell
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
SELinux Policy RPM            selinux-policy-targeted-34.2-1.fc34.noarch
Local Policy RPM              selinux-policy-targeted-34.2-1.fc34.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 5.11.12-300.fc34.x86_64 #1 SMP Wed
                              Apr 7 16:31:13 UTC 2021 x86_64 x86_64
Alert Count                   2
First Seen                    2021-04-09 10:34:02 EDT
Last Seen                     2021-04-09 18:48:20 EDT
Local ID                      b25d8152-75ae-4498-ba63-024671e45aec

Raw Audit Messages
type=AVC msg=audit(1618008500.697:765): avc:  denied  { map } for  pid=2080 comm="gnome-shell" path=2F6D656D66643A7761796C616E642D637572736F72202864656C6574656429 dev="tmpfs" ino=11265 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:tmpfs_t:s0 tclass=file permissive=0


Hash: gnome-shell,xdm_t,tmpfs_t,file,map

Version-Release number of selected component:
selinux-policy-targeted-34.2-1.fc34.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.14.0
hashmarkername: setroubleshoot
kernel:         5.11.12-300.fc34.x86_64
type:           libreport

Potential duplicate: bug 1941852