GNOME on Xorg freezes on restart or shutdown, Problem Reporting says tainted kernel

edit

When I'm using GNOME on Xorg and try to restart or shutdown the computer, the entire system freezes and I have to do force shutdown by holding the power button on my laptop. This has started happening yesterday and it happens every time now. These are all the packages/updates that were installed in the period since I started having this issue. The issue does not appear with GNOME (on Wayland).

ernel-headers-4.15.3-300.fc27.x86_64         Sat 17 Feb 2018 12:31:39 AM CET
libsane-hpaio-3.17.11-8.fc27.x86_64           Sat 17 Feb 2018 12:31:35 AM CET
kernel-modules-extra-4.15.3-300.fc27.x86_64   Sat 17 Feb 2018 12:31:35 AM CET
kernel-4.15.3-300.fc27.x86_64                 Sat 17 Feb 2018 12:31:35 AM CET
hplip-3.17.11-8.fc27.x86_64                   Sat 17 Feb 2018 12:31:35 AM CET
hplip-libs-3.17.11-8.fc27.x86_64              Sat 17 Feb 2018 12:31:33 AM CET
hplip-common-3.17.11-8.fc27.x86_64            Sat 17 Feb 2018 12:31:33 AM CET
kernel-modules-4.15.3-300.fc27.x86_64         Sat 17 Feb 2018 12:31:28 AM CET
kernel-core-4.15.3-300.fc27.x86_64            Sat 17 Feb 2018 12:31:26 AM CET
sane-backends-libs-1.0.27-12.fc27.x86_64      Sat 17 Feb 2018 12:31:23 AM CET
sane-backends-1.0.27-12.fc27.x86_64           Sat 17 Feb 2018 12:31:23 AM CET
gpg-pubkey-beb6d886-551540f4                  Fri 16 Feb 2018 10:26:12 PM CET
gpg-pubkey-2e1c0b95-573c97c9                  Fri 16 Feb 2018 10:10:41 PM CET

Also, in both cases (Wayland and Xorg), Problem Reporting throws 5 very similar issues on each startup, as shown in the following picture: https://imgur.com/a/Q5kPl. I've uploaded the full details (the entire data directory) for one of them to Google Drive and they can be accessed here: https://drive.google.com/open?id=1ofpq0ncMz9XiLF8BRZ1f2vy7CiGv1X. But it says that I cannot report them because the kernel has been "tainted", even though right now (in a Wayland session), running dmesg | grep -i taint gives nothing, and running cat /proc/sys/kernel/tainted returns 0.

After first log in to a Xorg session, cat /proc/sys/kernel/tainted returns 512, and dmesg | grep -i taint returns this:

[ 1890.014257] CPU: 1 PID: 6225 Comm: Xorg Not tainted 4.15.3-300.fc27.x86_64 #1
[ 1892.020897] CPU: 5 PID: 6225 Comm: Xorg Tainted: G        W        4.15.3-300.fc27.x86_64 #1
[ 1894.022234] CPU: 1 PID: 6225 Comm: Xorg Tainted: G        W        4.15.3-300.fc27.x86_64 #1
[ 1896.023690] CPU: 5 PID: 6225 Comm: Xorg Tainted: G        W        4.15.3-300.fc27.x86_64 #1
[ 1898.025194] CPU: 1 PID: 6225 Comm: Xorg Tainted: G        W        4.15.3-300.fc27.x86_64 #1
[ 1900.026671] CPU: 5 PID: 6225 Comm: Xorg Tainted: G        W        4.15.3-300.fc27.x86_64 #1
[ 1902.027978] CPU: 1 PID: 6225 Comm: Xorg Tainted: G        W        4.15.3-300.fc27.x86_64 #1
[ 1904.039878] CPU: 5 PID: 6225 Comm: Xorg Tainted: G        W        4.15.3-300.fc27.x86_64 ...