Somewhat surprisingly, perf_event_open can fail with EINTR when trying to enable perf reporting for a uprobe that's already been configured for use with ftrace. Mention this error in the man page. diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2 index 25876c36c..b9128f542 100644 --- a/man2/perf_event_open.2 +++ b/man2/perf_event_open.2 @@ -3228,6 +3228,10 @@ values are out of range or set reserved bits; the generic event selected is not supported; or there is not enough room to add the selected event. .TP +.B EINTR +Returned when trying to mix perf and ftrace handling +for a uprobe. +.TP .B EMFILE Each opened event uses one file descriptor. If a large number of events are opened,
