On Tue, 9 Nov 2021 at 13:22, Marco Elver <elver@xxxxxxxxxx> wrote: > syzbot reported that the warning in perf_sigtrap() fires, saying that > the event's task does not match current: > > | WARNING: CPU: 0 PID: 9090 at kernel/events/core.c:6446 perf_pending_event+0x40d/0x4b0 kernel/events/core.c:6513 [...] > This happened because the 'sched_wakeup' tracepoint also takes a task > argument passed on to perf_tp_event(), which is used to deliver the > event to that other task. > > Since we cannot deliver synchronous signals to other tasks, skip an event if > perf_tp_event() is targeted at another task and perf_event_attr::sigtrap is > set, which will avoid ever entering perf_sigtrap() for such events. [...] Hmm, I made the mistake of sending this in the merge-window. Any comments? Thanks, -- Marco
