Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1507106

Re: hit a KASan bug related to Perf during stress test

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: hit a KASan bug related to Perf during stress test
Date 2016-10-24 13:30 +0200
Message-ID <svLC2-6Wt-3@gated-at.bofh.it> (permalink)
References <svKd0-5NX-5@gated-at.bofh.it> <svKd0-5NX-3@gated-at.bofh.it> <svLsl-6Te-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

On Mon, Oct 24, 2016 at 01:15:27PM +0200, Oleg Nesterov wrote:
> How about the trivial fix below?
> 
> Oleg.
> 
> --- x/kernel/events/core.c
> +++ x/kernel/events/core.c
> @@ -1257,7 +1257,7 @@ static u32 perf_event_pid(struct perf_ev
>  	if (event->parent)
>  		event = event->parent;
>  
> -	return task_tgid_nr_ns(p, event->ns);
> +	return pid_alive(p) ? task_tgid_nr_ns(p, event->ns) : 0;
>  }

Also, now we get a (few) sample(s) with a different pid:tid than prior
samples and not matching the sched_switch() events.

I can imagine that being somewhat confusing for people/tools.

Acme/Jolsa, any idea if that will bugger perf-report?

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-24 12:00 +0200
  Re: hit a KASan bug related to Perf during stress test Oleg Nesterov <oleg@redhat.com> - 2016-10-24 13:20 +0200
    Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-24 13:30 +0200
      Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-24 13:40 +0200
        Re: hit a KASan bug related to Perf during stress test Jiri Olsa <jolsa@redhat.com> - 2016-10-24 14:10 +0200
          Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-24 14:20 +0200
    Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-24 13:30 +0200
      Re: hit a KASan bug related to Perf during stress test Oleg Nesterov <oleg@redhat.com> - 2016-10-24 14:10 +0200
        Re: hit a KASan bug related to Perf during stress test Oleg Nesterov <oleg@redhat.com> - 2016-10-24 14:20 +0200
          Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-24 14:30 +0200
            Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-24 14:40 +0200
              Re: hit a KASan bug related to Perf during stress test Oleg Nesterov <oleg@redhat.com> - 2016-10-24 15:30 +0200
                Re: hit a KASan bug related to Perf during stress test Oleg Nesterov <oleg@redhat.com> - 2016-10-24 15:50 +0200
                Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-24 16:20 +0200
                Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-24 16:40 +0200
                Re: hit a KASan bug related to Perf during stress test Oleg Nesterov <oleg@redhat.com> - 2016-10-24 17:50 +0200
                Re: hit a KASan bug related to Perf during stress test Oleg Nesterov <oleg@redhat.com> - 2016-10-24 18:00 +0200
                RE: hit a KASan bug related to Perf during stress test "Ni, BaoleX" <baolex.ni@intel.com> - 2016-10-25 09:00 +0200
                Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-25 11:30 +0200
                Re: hit a KASan bug related to Perf during stress test Oleg Nesterov <oleg@redhat.com> - 2016-10-25 16:50 +0200
                Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-26 11:10 +0200
                Re: hit a KASan bug related to Perf during stress test Oleg Nesterov <oleg@redhat.com> - 2016-10-26 18:20 +0200
            Re: hit a KASan bug related to Perf during stress test Oleg Nesterov <oleg@redhat.com> - 2016-10-24 14:40 +0200
        Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-24 14:20 +0200
    Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-24 14:20 +0200
      Re: hit a KASan bug related to Perf during stress test Peter Zijlstra <peterz@infradead.org> - 2016-10-24 14:30 +0200
      Re: hit a KASan bug related to Perf during stress test Oleg Nesterov <oleg@redhat.com> - 2016-10-24 14:30 +0200

csiph-web