Re: 'perf test sigtrap' failing on PREEMPT_RT_FULL

[Mike Galbraith]

On Tue, 2023-07-25 at 17:15 -0300, Arnaldo Carvalho de Melo wrote:
> Hi Marco, Peter,
>
>         I got a report that 'perf test sigtrap' test failed on a
> PREEMPT_RT_FULL kernel, one that had up to:
>
> commit 97ba62b278674293762c3d91f724f1bb922f04e0
> Author: Marco Elver <elver@xxxxxxxxxx>
> Date:   Thu Apr 8 12:36:01 2021 +0200
>
>     perf: Add support for SIGTRAP on perf events
> ...

> [   52.848925] BUG: scheduling while atomic: perf/6549/0x00000002

Had bf9ad37dc8a not been reverted due to insufficient beauty, you could
trivially make the sigtrap test a happy camper (wart tested in tip-rt).

	-Mike

@@ -1829,6 +1869,9 @@ int send_sig_perf(void __user *addr, u32
 				     TRAP_PERF_FLAG_ASYNC :
 				     0;

+	if (force_sig_delayed(&info, current))
+		return 0;
+
 	return send_sig_info(info.si_signo, &info, current);
 }