[Bug 230144] Linux emulator does not work on Ryzen / Epic processors

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230144

--- Comment #9 from Conrad Meyer <cem at freebsd.org> ---
On CURRENT truss uname shows:

$ truss /compat/linux/bin/uname
linux_brk(0x0)                                   = 6324224 (0x608000)
linux_newuname(0x7fffffffb59a)                   = 0 (0x0)
...
write(1,"Linux\n",6)                             = 6 (0x6)

So I suspect it is not the brk, but the newuname() with the stack address
within a page of the invalid range (on 11.2 Nathan reports 0x7ffffffff508).  On
zen addresses >= 0x7ffffffff000 should be avoided, and it looks like they are
on CURRENT.

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