From: "J. Bruce Fields" <bfields@redhat.com>
Date: Wed, 13 May 2020 18:38:40 -0400
Subject: [PATCH] SUNRPC: 'Directory with parent 'rpc_clnt' already present!'
Git-commit: 933496e9cc02cda16ca8f0c38e56204376d6b0b2
Patch-mainline: v5.7
References: bsc#1168202 bsc#1188924

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: 7c4310ff5642 "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>
Acked-by: NeilBrown <neilb@suse.com>

---
 net/sunrpc/clnt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -889,6 +889,7 @@ static void rpc_free_client_work(struct
 	 * 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);