Update 1: 2017/09/28 4:11pm PDT
It turns out that there were a few things broken in the first release for the Pixels. If you were having any trouble with your Magisk modules, the newly-released 14.2
Hot off his recent vacation, Magisk developer topjohnwu has released a beta version of Magisk (v14.1) that works with the Pixel phones. We've even installed it on one of our own Pixel XLs and, well, it works.Read More
[Update: 14.2 bugfix and download] Magisk beta v14.1 roots the Pixels and survives OTA was written by the awesome team at Android Police.