Index: sys/cddl/dev/fbt/arm/fbt_isa.c
===================================================================
--- sys/cddl/dev/fbt/arm/fbt_isa.c
+++ sys/cddl/dev/fbt/arm/fbt_isa.c
@@ -111,6 +111,13 @@
 	if (strcmp(name, "undefinedinstruction") == 0)
 		return (0);
 
+	/*
+	 * In absence of DTrace kernel-module support on ARM, we need to
+	 * manually exclude FBT functions from instrumentation.
+	 */
+	if (strncmp(name, "fbt_", 4) == 0)
+		return (0);
+
 	instr = (uint32_t *)symval->value;
 	limit = (uint32_t *)(symval->value + symval->size);