diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index 1a6a453..9489a0a 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -597,7 +597,9 @@
 	if (!sys_tracepoint_refcount) {
 		read_lock_irqsave(&tasklist_lock, flags);
 		do_each_thread(g, t) {
-			set_tsk_thread_flag(t, TIF_SYSCALL_TRACEPOINT);
+			/* Skip kernel threads. */
+			if (t->mm)
+				set_tsk_thread_flag(t, TIF_SYSCALL_TRACEPOINT);
 		} while_each_thread(g, t);
 		read_unlock_irqrestore(&tasklist_lock, flags);
 	}