https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225584
--- Comment #63 from Konstantin Belousov <k...@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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