D27754.id81218.diff
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D27754.id81218.diff
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	Index: sys/cddl/dev/fbt/fbt.c
	===================================================================
	--- sys/cddl/dev/fbt/fbt.c
	+++ sys/cddl/dev/fbt/fbt.c
	@@ -171,6 +171,21 @@
	return (1);
	#endif

	+#if defined(__riscv)
	+ /*
	+ * Some assembly-language exception handlers are not suitable for
	+ * instrumentation.
	+ */
	+ if (strcmp(name, "cpu_exception_handler") == 0)
	+ return (1);
	+ if (strcmp(name, "cpu_exception_handler_user") == 0)
	+ return (1);
	+ if (strcmp(name, "cpu_exception_handler_supervisor") == 0)
	+ return (1);
	+ if (strcmp(name, "do_trap_supervisor") == 0)
	+ return (1);
	+#endif
	+
	/*
	* When DTrace is built into the kernel we need to exclude
	* the FBT functions from instrumentation.