[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 #85 from mike at sentex.net ---
(In reply to Konstantin Belousov from comment #84)

(gdb) thread 4
[Switching to thread 4 (LWP 101503 of process 43500)]
#0  _umtx_op_err () at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:37
37      RSYSCALL_ERR(_umtx_op)
(gdb) frame 1
#1  0x0000000800654024 in __thr_umutex_lock (mtx=0x8006640a8, id=101503) at
/usr/src/lib/libthr/thread/thr_umtx.c:82
82                      _umtx_op_err(mtx, UMTX_OP_MUTEX_WAIT, 0, 0, 0);
(gdb) list
77                              return (EOWNERDEAD);
78                      if (owner == UMUTEX_RB_NOTRECOV)
79                              return (ENOTRECOVERABLE);
80
81                      /* wait in kernel */
82                      _umtx_op_err(mtx, UMTX_OP_MUTEX_WAIT, 0, 0, 0);
83              }
84      }
85
86      #define SPINLOOPS 1000
(gdb) print *mtx
$1 = {m_owner = -2147382146, m_flags = 0, m_ceilings = {0, 0}, m_rb_lnk = 0,
m_spare = {0, 0}}
(gdb)

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