Same issue here with Dell XPS 9380, With support assist and windows 10 1903 i get the Bad pool caller blue screen, and once I uninstall the support assist all runs well. I have attempted multiple calls into support and have not gotten any solutions to the known issue. Basically the user must choose to run old versions of windows, or run hardware without automated updates from Dell. Note, Dell did a remote session. They installed the IRST driver from Intel's site, then installed SA. All working now.
Dell SA causes a BAD_POOL_CALLER blue screen crash on the new Windows 10 1903 update on my XPS 13-9360 (warranty expired on 11/27/18). Uninstalling Dell SA fixes the problem.
SA, Windows 1903, BSOD