You might see a blue screen error after you install or upgrade to ENS Threat Prevention 10.7.0 February 2021 Update and later. The Bug check code can be Bug check 3b, Bug check 19, Bug check 50, or Bug check 5d. This issue is random and only occurs in a few environments. There have been certain cases when driver verifier has been enabled on the system the blue screen error doesn’t occur anymore.

Example of a stack trace:

ffffd001`686e4720 fffff800`f6cce175 : 00000000`0000032c 00000000`00000e28 ffffe801`86003b30 fffff800`f6d70090 : mfehidk!PROCESSINFO_::Release+0x259
ffffd001`686e4750 fffff800`f6cd302c : 00000000`00000000 00000000`00000e28 00000000`00000e28 00000000`00000e01 : mfehidk!CheckForSignalledProcesses+0xe5
ffffd001`686e47b0 fffff800`f6c94ac7 : 00000000`00000000 ffffe801`86374080 ffffe001`b4579670 ffffe001`ade17848 : mfehidk!ProcessInfoProcessExited+0x28c
ffffd001`686e4830 fffff800`f6c94c97 : ffffe001`b482de00 00000000`00000e28 ffffe801`86374080 ffffe001`ade177e0 : mfehidk!CONTROLDEVICE::InternalProcessNotifyEx+0x77
ffffd001`686e4860 fffff803`5c6437cd : ffffe801`86374080 fffff803`5c553b20 00000000`00000001 ffffe801`86374080 : mfehidk!CONTROLDEVICE::ProcessNotifyRoutineEx+0x67