[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 #63 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Konstantin Belousov from comment #62)
Try this.

diff --git a/sys/amd64/amd64/cpu_switch.S b/sys/amd64/amd64/cpu_switch.S
index 25e3a592171..ef70eefdf37 100644
--- a/sys/amd64/amd64/cpu_switch.S
+++ b/sys/amd64/amd64/cpu_switch.S
@@ -155,6 +155,7 @@ ctx_switch_xsave:
        movq    %rdx,%r15
        movq    %rsi,%rdi
        callq   pmap_activate_sw
+       mfence
        SETLK   %r15,TD_LOCK(%r13)              /* Release the old thread */
 sw1:
        movq    TD_PCB(%r12),%r8

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