From: Tao Chen <chentao.kernel@xxxxxxxxxxxxxxxxx> commit dc399adecd4e2826868e5d116a58e33071b18346 upstream. The event dir will alloc failed when event name no set, using the command: "echo "e:esys/ syscalls/sys_enter_openat file=\$filename:string" >> dynamic_events" It seems that dir name="syscalls/sys_enter_openat" is not allowed in debugfs. So just use the "sys_enter_openat" as the event name. Link: https://lkml.kernel.org/r/1664028814-45923-1-git-send-email-chentao.kernel@xxxxxxxxxxxxxxxxx Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Tom Zanussi <zanussi@xxxxxxxxxx> Cc: Linyu Yuan <quic_linyyuan@xxxxxxxxxxx> Cc: Tao Chen <chentao.kernel@xxxxxxxxxxxxxxxxx Cc: stable@xxxxxxxxxxxxxxx Fixes: 95c104c378dc ("tracing: Auto generate event name when creating a group of events") Acked-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx> Signed-off-by: Tao Chen <chentao.kernel@xxxxxxxxxxxxxxxxx> Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- kernel/trace/trace_eprobe.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/kernel/trace/trace_eprobe.c +++ b/kernel/trace/trace_eprobe.c @@ -968,8 +968,7 @@ static int __trace_eprobe_create(int arg } if (!event) { - strscpy(buf1, argv[1], MAX_EVENT_NAME_LEN); - sanitize_event_name(buf1); + strscpy(buf1, sys_event, MAX_EVENT_NAME_LEN); event = buf1; }
