Messages appear while on kernel 4.5 when on command line:
 
systemd[1]: Journal service failed to start appear and kworker process is blocked.

INFO: task kworker/u8:0:6 blocked for more than 120 seconds Tainted: G 0 4.5.2-1-ARCH #1 "echo bla bla bla" disables this message.

Sometimes it also I get this output as I am about to decrypt my home folder and log in:
[18.783662] ata2.00: exception Emask 0x0 SAct 0x0 Serr 0x0 action 0x6 frozen
[18.783937] ata2.00: cmd a0/00:00:00:00:00:00:/a0 tag 15 pio 16392 in [18.783937] opcode-0x4a 4a 01 00 00 10 00 00 00 08 00res 50/00:03:00 ... Emask 0x4 (timeout)
[18.783941] ata2.00: status: { DRDY }
********[21.687301] usb 1-3: device descriptor read/64, error -110

I never get these errors when I am in kernel 4.4.5-1

Reproducible: Always

Steps to Reproduce:
1. Upgrade from linux 4.4.5-1 to 4.5.2-1 in KDE Plasma 5.6.4
2. Restart machine
3. Boot normally
4. Blank screen (sometimes I can see my desktop wallpaper but rarely and nothing else)
5. Restart machine
6. Boot in level 3 so you have command line instead of gui and these messages appear sporadically from time to time.

Actual Results:  
Blank screen and when on command line only the messages described in the details appear.

Expected Results:  
It should have shown the shell normally without the messages and everything should have worked fine just like in kernel 4.4.5

The laptop runs hot as if trying to complete a heavy task. I think its caused by the kworker not being able to run.