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Index: head/sys/amd64/amd64/exception.S
===================================================================
--- head/sys/amd64/amd64/exception.S
+++ head/sys/amd64/amd64/exception.S
@@ -211,6 +211,8 @@
* interrupt. For all other trap types, just handle them in
* the usual way.
*/
+ testb $SEL_RPL_MASK,TF_CS(%rsp) /* Did we come from kernel? */
+ jnz calltrap /* ignore userland traps */
cmpl $T_BPTFLT,TF_TRAPNO(%rsp)
jne calltrap

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