[Bug 205903] x11/nvidia-driver-340: Repeating crash with nvidia-driver: "fault on nofault entry"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205903

--- Comment #9 from Michael Danilov <mike.d.ft402 at gmail.com> ---
Created attachment 170497
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=170497&action=edit
Patch to x11/nvidia-driver to CAUSE the panic.

Alright, I think I have come up with a reliable way to reproduce this annoying
problem.

Here is a broken version of the patch suggested in
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195097 that causes (I think!)
similar panic. I have fed rm_free_unused_clients null pointer only on one
occasion and it crashed where I expected it to crash -- on exiting 3D programs.

In that bug they suggest that "Here rm_free_unused_clients is called with a
null pointer. This function is not open source, but from the panic my guess is
it's not happy being called with a null pointer.", which pretty much may be the
case here.

STEPS TO REPRODUCE A
1. Install driver with patch applied.
2. Start a 3D program (I used Blender).
3. Exit the program.

STEPS TO REPRODUCE B
1. Start X.
2. Kill X.

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