[6.8.1] crash on boot (sometimes)

There are been several reports of serves crashing on boot after updating to v6.8.1, and they all crash in the same place:

/etc/rc.d/rc.M: line 164:   modprobe -r $DRIVERS

Some examples

https://forums.unraid.net/topic/87378-server-fails-to-start-after-update/

https://forums.unraid.net/topic/87435-system-hang-681/

https://forums.unraid.net/topic/87664-sometimes-my-unraid-isn’t-starting-since-last-update/

I just had the same happening to me after upgrading one of my servers to v6.8.1:

Rebooted and it crashed again:

Ran chkdsk but no errors found:

Rebooted again and this time server started, rebooted two times successfully and then it crashed again on the 2 next ones, one more attempt and again it booted again correctly, attaching diags more to see the hardware used, but other reports are with very different hardware, AMD and Intel based servers.

It's strange because it only happens sometimes, my last boots:

X X (ran chkdsk) V V V X X V

X - crashed

V - booted

tower5-diagnostics-20200123-0752.zip

Video showing where it crashes:

This server uses