linux-kernel - [tip:perf/core] perf cgroup: Fix refcount usage

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Message-ID: <tip-l7ovfblq14ip2i08m1g0fkhv@git.kernel.org>
Date:   Wed, 26 Jul 2017 10:21:57 -0700
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, acme@...hat.com, pjt@...gle.com,
        keescook@...omium.org, kjlx@...pleofstupid.com,
        brendan.d.gregg@...il.com, davidcc@...gle.com,
        alexander.shishkin@...ux.intel.com, dsahern@...il.com,
        eranian@...gle.com, tmricht@...ux.vnet.ibm.com,
        peterz@...radead.org, mingo@...nel.org, arnaldo.melo@...il.com,
        elena.reshetova@...el.com, Sudeep.Holla@....com,
        wangnan0@...wei.com, tglx@...utronix.de, hpa@...or.com
Subject: [tip:perf/core] perf cgroup: Fix refcount usage

Commit-ID:  cd8dd032f61abeb08d2c03bab4968a9de231a1be
Gitweb:     http://git.kernel.org/tip/cd8dd032f61abeb08d2c03bab4968a9de231a1be
Author:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
AuthorDate: Tue, 18 Jul 2017 20:20:19 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 25 Jul 2017 11:23:50 -0300

perf cgroup: Fix refcount usage

When converting from atomic_t to refcount_t we didn't follow the usual
step of initializing it to one before taking any new reference, which
trips over checking if taking a reference for a freed refcount_t, fix
it.

Brendan's report:

 ---
It's 4.12-rc7, with node v4.4.1. I'm building 4.13-rc1 now, as I hit
what I think is another unrelated perf bug and I'm starting to wonder
what else is broken on that version:

(root) /mnt/src/linux-4.12-rc7/tools/perf # ./perf record -F 99 -a -e
cpu-clock --cgroup=docker/f9e9d5df065b14646e8a11edc837a13877fd90c171137b2ba3feb67a0201cb65
-g
perf: /mnt/src/linux-4.12-rc7/tools/include/linux/refcount.h:108:
refcount_inc: Assertion `!(!refcount_inc_not_zero(r))' failed.
Aborted

that used to work...
 ---

Testing it:

Before:

  # perf stat -e cycles -C 0 --cgroup /
  perf: /home/acme/git/linux/tools/include/linux/refcount.h:108: refcount_inc: Assertion `!(!refcount_inc_not_zero(r))' failed.
  Aborted (core dumped)
  #

After:

  # perf stat -e cycles -C 0 --cgroup /
^C
  Performance counter stats for 'CPU(s) 0':

       132,081,393      cycles                    /

       2.492942763 seconds time elapsed

  #

Reported-by: Brendan Gregg <brendan.d.gregg@...il.com>
Acked-by: Elena Reshetova <elena.reshetova@...el.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: David Ahern <dsahern@...il.com>
Cc: David Carrillo-Cisneros <davidcc@...gle.com>
Cc: Kees Kook <keescook@...omium.org>
Cc: Krister Johansen <kjlx@...pleofstupid.com>
Cc: Paul Turner <pjt@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Sudeep Holla <Sudeep.Holla@....com>
Cc: Thomas-Mich Richter <tmricht@...ux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@...wei.com>
Fixes: 79c5fe6db8c7 ("perf cgroup: Convert cgroup_sel.refcnt from atomic_t to refcount_t")
Link: http://lkml.kernel.org/n/tip-l7ovfblq14ip2i08m1g0fkhv@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/cgroup.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
index 0334774..0e77bc9e5 100644
--- a/tools/perf/util/cgroup.c
+++ b/tools/perf/util/cgroup.c
@@ -98,8 +98,10 @@ static int add_cgroup(struct perf_evlist *evlist, char *str)
 		cgrp = counter->cgrp;
 		if (!cgrp)
 			continue;
-		if (!strcmp(cgrp->name, str))
+		if (!strcmp(cgrp->name, str)) {
+			refcount_inc(&cgrp->refcnt);
 			break;
+		}
 
 		cgrp = NULL;
 	}
@@ -110,6 +112,7 @@ static int add_cgroup(struct perf_evlist *evlist, char *str)
 			return -1;
 
 		cgrp->name = str;
+		refcount_set(&cgrp->refcnt, 1);
 
 		cgrp->fd = open_cgroup(str);
 		if (cgrp->fd == -1) {
@@ -128,12 +131,11 @@ static int add_cgroup(struct perf_evlist *evlist, char *str)
 			goto found;
 		n++;
 	}
-	if (refcount_read(&cgrp->refcnt) == 0)
+	if (refcount_dec_and_test(&cgrp->refcnt))
 		free(cgrp);
 
 	return -1;
 found:
-	refcount_inc(&cgrp->refcnt);
 	counter->cgrp = cgrp;
 	return 0;
 }