[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 #30 from mike at sentex.net ---
(In reply to Konstantin Belousov from comment #29)
(gdb) thread 9
[Switching to thread 9 (LWP 101309 of process 48133)]
#0  _umtx_op () at _umtx_op.S:3
3       RSYSCALL(_umtx_op)
(gdb) frame 6
#6  0x0000000800a85aa5 in file_close (f=0x80fd91b70) at
Objects/fileobject.c:669
669         PyObject *sts = close_the_file(f);
(gdb) print *f
$5 = {ob_refcnt = 2, ob_type = 0x800e1baf0 <PyFile_Type>, f_fp = 0x0, f_name =
'/usr/ports/net/samba47/work/samba-4.7.4/bin/default/docs-xml/manpages/net.8',
f_mode = 'rb', 
  f_close = 0x801237880 <fclose>, f_softspace = 0, f_binary = 1, f_buf = 0x0,
f_bufend = 0x0, f_bufptr = 0x0, f_setbuf = 0x0, f_univ_newline = 0,
f_newlinetypes = 0, f_skipnextlf = 0, 
  f_encoding = None, f_errors = None, weakreflist = 0x0, unlocked_count = 0,
readable = 1, writable = 0}
(gdb) print *(f->f_fp)
Cannot access memory at address 0x0
(gdb) print *(f->f_fp)
Cannot access memory at address 0x0
(gdb)

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