Created attachment 840859 [details]
tar with two syslog files of the freezes

I've now twice gotten full system freezes of my Lenovo T460p laptop running TW
20200813.  Both happened after the laptop had been placed back into its docking
station.

I.e., I (usually) boot it in the dock, and use it there.  Sometimes I need to
work in the lab, then I take it out, and place it back in the dock afterwards.

Both yesterday and today, this resulted in a complete freeze of the system. 
The only thing still working was the mouse (I could move the cursor), which -
strange enough - is connected to the dock, not to the laptop.  No reaction on
keyboard or network pings.

Both cases show the same error messages several times before the freeze:

BUG: workqueue lockup - pool cpus=2 node=0 flags=0x0 nice=0 stuck for 58s!

I attach the 'journalctl -b' logs for the two boot cycles.