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Message-ID: <c510711b-3904-e5e1-d296-61273d21118d@virtuozzo.com>
Date: Wed, 15 Nov 2017 08:47:02 +0300
From: Vasily Averin <vvs@...tuozzo.com>
To: linux-kernel@...r.kernel.org,
Hari Bathini <hbathini@...ux.vnet.ibm.com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH] memory leaks triggered by perf --namespace
perf with --namespace key leaks various memory objects including namespaces
# uname -r
4.14.0+
# perf record -q --namespace unshare -n -U -p --fork true
# grep namespace /proc/slabinfo
pid_namespace 1 12 2568 12 8
user_namespace 1 39 824 39 8
net_namespace 1 5 6272 5 8
This happen because perf_fill_ns_link_info() struct patch ns_path:
during initialization ns_path incremented counters on related mnt and dentry,
but without lost path_put nobody decremented them back.
Leaked dentry is name of related namespace,
and its leak does not allow to free unused namespace.
Fixes: commit e422267322cd ("perf: Add PERF_RECORD_NAMESPACES to include namespaces related info")
Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
---
kernel/events/core.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 10cdb9c..ab5ac84 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6756,6 +6756,7 @@ static void perf_fill_ns_link_info(struct perf_ns_link_info *ns_link_info,
ns_inode = ns_path.dentry->d_inode;
ns_link_info->dev = new_encode_dev(ns_inode->i_sb->s_dev);
ns_link_info->ino = ns_inode->i_ino;
+ path_put(&ns_path);
}
}
--
2.7.4
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