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SUNRPC: 'Directory with parent 'rpc_clnt' already present!'

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Each rpc_client has a cl_clid which is allocated from a global ida, and
a debugfs directory which is named after cl_clid.

We're releasing the cl_clid before we free the debugfs directory named
after it.  As soon as the cl_clid is released, that value is available
for another newly created client.

That leaves a window where another client may attempt to create a new
debugfs directory with the same name as the not-yet-deleted debugfs
directory from the dying client.  Symptoms are log messages like

	Directory 4 with parent 'rpc_clnt' already present!

Fixes: 7c4310ff56 "SUNRPC: defer slow parts of rpc_free_client() to a workqueue."
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
J. Bruce Fields 2020-05-13 18:38:40 -04:00 committed by Trond Myklebust
parent 4fa7ef69e2
commit 933496e9cc
1 changed files with 1 additions and 1 deletions
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2
net/sunrpc/clnt.c
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@ -889,6 +889,7 @@ static void rpc_free_client_work(struct work_struct *work)
* here.
*/
rpc_clnt_debugfs_unregister(clnt);
rpc_free_clid(clnt);
rpc_clnt_remove_pipedir(clnt);
xprt_put(rcu_dereference_raw(clnt->cl_xprt));
@ -910,7 +911,6 @@ rpc_free_client(struct rpc_clnt *clnt)
clnt->cl_metrics = NULL;
xprt_iter_destroy(&clnt->cl_xpi);
put_cred(clnt->cl_cred);
rpc_free_clid(clnt);
INIT_WORK(&clnt->cl_work, rpc_free_client_work);
schedule_work(&clnt->cl_work);