[Bug 293382] Dead lock and kernel crash around closefp_impl

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293382

--- Comment #82 from Kristofer Peterson <kris@tranception.com> ---
Created attachment 269850
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=269850&action=edit
Updated kernel module for testing memory allocation [v2]

This updated version of the test kernel module has been pared down to a simple
allocate, write, check, free loop that is sufficient to surface the issue on
AMD EPYC Zen4 & Zen5 CPUs. The syscall returns EINTEGRITY if an error is found,
EINVAL if passed invalid parameters or zero if the checks passed.

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