From:   Thomas Gleixner <tglx@linutronix.de>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     linux-kernel@vger.kernel.org, x86@kernel.org
Subject: [GIT pull] perf/urgent for v5.16-rc3
References: <163811728418.767205.14544746031342483043.tglx@xen13>
Message-ID: <163811728568.767205.16569892085230083687.tglx@xen13>
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Date:   Sun, 28 Nov 2021 17:35:18 +0100 (CET)
Precedence: bulk

Linus,

please pull the latest perf/urgent branch from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf-urgent-2021=
-11-28

up to:  73743c3b0922: perf: Ignore sigtrap for tracepoints destined for other=
 tasks


A single fix for perf to prevent that it sends SIGTRAP to another task from
a trace point event as it's not possible to deliver a synchronous signal to
a different task from there.


Thanks,

	tglx

------------------>
Marco Elver (1):
      perf: Ignore sigtrap for tracepoints destined for other tasks


 kernel/events/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 523106a506ee..30d94f68c5bd 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -9759,6 +9759,9 @@ void perf_tp_event(u16 event_type, u64 count, void *rec=
ord, int entry_size,
 				continue;
 			if (event->attr.config !=3D entry->type)
 				continue;
+			/* Cannot deliver synchronous signal to other task. */
+			if (event->attr.sigtrap)
+				continue;
 			if (perf_tp_event_match(event, &data, regs))
 				perf_swevent_event(event, count, &data, regs);
 		}