freebsd stable - Nov 2017 - Should patch releases to stable 11.1 (errata) include fixes for kernel crashes?

Should patch releases to stable 11.1 (errata) include fixes for kernel 
crashes?

Referring to:
   Bug 222259  - 11.1-R crashing in sendfile syscall, as used by a uwsgi 
process
     https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222259
     https://svnweb.freebsd.org/base?view=revision&revision=323634

So my background story is: I fell for this trick twice now, upgrading
a 11.1-p3 to -p4, and now a -p4 to -p5 -- forgetting that I need a
patched kernel for our web servers (quite a common setup: nginx+uwsgi);
so after an upgrade crashes returned.

I know, my fault, but I wonder, shouldn't a fix for kernel crashes
end up in a patch release of a stable version, with an errata notice?

   Mark