[Bug 261338] [PATCH] kernel panic "bad pte" under heavy CPU load on 12.2 and 12.3 (i386)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261338

--- Comment #19 from Richard Frewin <Richard@FrewinIT.uk> ---
I installed a VirtualBox VM from 12.2 i386 ISO and used freebsd-update to
update to 12.2-p12.  At this point I tried to recreate problem but could not
get it to panic as I'm seeing on bare-metal systems.

Then built a custom kernel with the patch in Attachment 231174.  By the way,
that applied with "Hunk #1 succeeded at 1663 (offset -6 lines)."

I've copied the resultant /boot/kernel to a production system and after a
reboot (caused by another panic) it's now running the patched kernel.  Initial
tests suggest it's fixed the issue, as it didn't panic during a couple of
forced backups.

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