linux-kernel - Re: [PATCH] perf: Fix missing SIGTRAPs

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Date:   Fri, 7 Oct 2022 18:14:27 +0200
From:   Marco Elver <elver@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH] perf: Fix missing SIGTRAPs

On Fri, Oct 07, 2022 at 03:58PM +0200, Marco Elver wrote:
> On Fri, Oct 07, 2022 at 03:09PM +0200, Peter Zijlstra wrote:
> > On Fri, Oct 07, 2022 at 11:37:34AM +0200, Marco Elver wrote:
> > 
> > > That worked. In addition I had to disable the ctx->task != current check
> > > if we're in task_work, because presumably the event might have already
> > > been disabled/moved??
> > 
> > Uhmmm... uhhh... damn. (wall-time was significantly longer)
> > 
> > Does this help?
> 
> No unfortunately - still see:
> 
> [   82.300827] ------------[ cut here ]------------
> [   82.301680] WARNING: CPU: 0 PID: 976 at kernel/events/core.c:6466 perf_sigtrap+0x60/0x70

Whenever the warning fires, I see that event->state is OFF.