*** This bug is a duplicate of bug 1813663 ***
https://bugs.launchpad.net/bugs/1813663
I had similar problem with my Thinkpad X1 and Thinkpad Thunderbolt dock.
Updating to the newest release of kernel (4.15.0-45-generic) today morning
fixed the issue
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https://bugs.launchpad.net/bugs/1813796
Title:
kernel bug null pointer dereference
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