[Bug 225584] Various compile process hang on Ryzen, but not on Intel

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225584

--- Comment #24 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to mike from comment #23)

Try:

(gdb) thread 11
[Switching to thread 11 (LWP 101275 of process 38415)]
#0  _umtx_op_err () at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:37
(gdb) bt
. . .

In other words: first switch to thread 11 then do bt without
mentioning thread 11.

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