D52421.diff
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	diff --git a/sys/kern/kern_thr.c b/sys/kern/kern_thr.c
	--- a/sys/kern/kern_thr.c
	+++ b/sys/kern/kern_thr.c
	@@ -346,6 +346,17 @@

	p = td->td_proc;

	+ /*
	+ * Clear kernel ASTs in advance of selecting the last exiting
	+ * thread and acquiring schedulers locks. It is fine to
	+ * clear the ASTs here even if we are not going to exit after
	+ * all. On the other hand, leaving them pending could trigger
	+ * execution in subsystems in a context where they are not
	+ * prepared to handle top kernel actions, even in execution of
	+ * an unrelated thread.
	+ */
	+ ast_kclear(td);
	+
	/*
	* If all of the threads in a process call this routine to
	* exit (e.g. all threads call pthread_exit()), exactly one