[Bug 219399] System panics after several hours of 14-threads-compilation orgies using poudriere on AMD Ryzen...

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219399

--- Comment #94 from Don Lewis <truckman at FreeBSD.org> ---
My machine is still stable if I only shift the shared page location and leave
the size unchanged.

Instead of decoding the CPU type to decide on whether to do this, I'm thinking
of making it a tunable so that those with non-Ryzen hardware can test the the
change for side effects and allow Ryzen users to test whether future microcode
updates fix the problem.

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