[Bug 276426] amd64: microcode update caused a page fault trying to send data to the logger

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276426

--- Comment #12 from Konstantin Belousov <kib@FreeBSD.org> ---
(In reply to Mark Johnston from comment #10)
It could be due to panic(), but then it is not clear why trap_pfault() called
trap_fatal() at line 759.  Either td_critnest was > 0, or we owned some
non-sleepable lock, and the later would only trigger if the witness was
compiled in.

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