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1b1ed1a
(Get the code!)
This bug seems to be the closest match to what I'm experiencing. I'm hitting similar trouble on desktop/graphical Ubuntu on some Dell laptops.
Ubuntu 16.04 AMD64.
Happening on kernel versions 4.13.0-38 and 4.4.0-116.
I've tried version 4.4.0-117 as posted by @kamalmostafa - same result.
The laptops are an XPS 13 and a Precision M3520. Both machines have Kaby Lake/7th gen Core i7 CPUs.
The problem on the 4.4.0-116 kernel (on my M3520) occurred the first reboot after updating the Intel microcode. I'm starting to think this is related to the Meltdown/Spectre patching.
I started sssd in the foreground with debug set to 9 on the M3520 and netcat'd the results to another machine, so I think I have it right up until the laptop stops responding. It's obviously quite verbose, but if someone thinks it'll help, I'll post it.
From talking to some of the people on #ubuntu-server, the microcode does seem to be increasingly likely the root cause. Bug #1759920 may include relevant information.