linux-kernel - Re: [PATCH] perf test: Fix hist testcases when kptr

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Message-ID: <20151214151529.GI6843@kernel.org>
Date:	Mon, 14 Dec 2015 12:15:29 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Namhyung Kim <namhyung@...nel.org>, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH] perf test: Fix hist testcases when kptr_restrict is on

Em Mon, Dec 14, 2015 at 10:48:07AM +0100, Jiri Olsa escreveu:
> On Mon, Dec 14, 2015 at 12:11:13PM +0900, Namhyung Kim wrote:
> > Currently if kptr_restrict is enabled, all hist tests failed with
> > segfaults.  This is because machine__create_kernel_maps() in
> > setup_fake_machine() failed in that situation, and it called
> > machine__delete() on the error path.  But outer callers again called
> > machines__exit() causing double free for the host machine.
> 
> Acked-by: Jiri Olsa <jolsa@...nel.org>

Thanks, applied.
 
> thanks,
> jirka
> 
> > 
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >  tools/perf/tests/hists_common.c | 5 ++---
> >  1 file changed, 2 insertions(+), 3 deletions(-)
> > 
> > diff --git a/tools/perf/tests/hists_common.c b/tools/perf/tests/hists_common.c
> > index 46f453b1de60..bcfd081ee1d2 100644
> > --- a/tools/perf/tests/hists_common.c
> > +++ b/tools/perf/tests/hists_common.c
> > @@ -88,8 +88,8 @@ struct machine *setup_fake_machine(struct machines *machines)
> >  	}
> >  
> >  	if (machine__create_kernel_maps(machine)) {
> > -		pr_debug("Not enough memory for machine setup\n");
> > -		goto out;
> > +		pr_debug("Cannot create kernel maps\n");
> > +		return NULL;
> >  	}
> >  
> >  	for (i = 0; i < ARRAY_SIZE(fake_threads); i++) {
> > @@ -155,7 +155,6 @@ struct machine *setup_fake_machine(struct machines *machines)
> >  out:
> >  	pr_debug("Not enough memory for machine setup\n");
> >  	machine__delete_threads(machine);
> > -	machine__delete(machine);
> >  	return NULL;
> >  }
> >  
> > -- 
> > 2.6.4
> > 
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