On Tue, 18 Mar 2025 11:07:00 +0900
Masami Hiramatsu (Google) [off-list ref] wrote:

quoted

--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c

@@ -790,7 +790,7 @@ static int __ftrace_event_enable_disable(struct trace_event_file *file,
 				clear_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags);
 			}
 
-			call->class->reg(call, TRACE_REG_UNREGISTER, file);
+			ret = call->class->reg(call, TRACE_REG_UNREGISTER, file);  

This is not enough. As same as enable failure, this function needs to handle
this error to report it and break.

Perhaps all we should do here is:

			WARN_ON_ONCE(ret);

-- Steve