[PATCH AUTOSEL 4.19 159/219] xprtrdma: Prevent leak of rpcrdma_rep objects

[Sasha Levin]

From: Chuck Lever <chuck.lever@xxxxxxxxxx>

[ Upstream commit 07e10308ee5da8e6132e0b737ece1c99dd651fb6 ]

If a reply has been processed but the RPC is later retransmitted
anyway, the req->rl_reply field still contains the only pointer to
the old rpcrdma rep. When the next reply comes in, the reply handler
will stomp on the rl_reply field, leaking the old rep.

A trace event is added to capture such leaks.

This problem seems to be worsened by the restructuring of the RPC
Call path in v4.20. Fully addressing this issue will require at
least a re-architecture of the disconnect logic, which is not
appropriate during -rc.

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 include/trace/events/rpcrdma.h | 28 ++++++++++++++++++++++++++++
 net/sunrpc/xprtrdma/rpc_rdma.c |  4 ++++
 2 files changed, 32 insertions(+)

diff --git a/include/trace/events/rpcrdma.h b/include/trace/events/rpcrdma.h
index 53df203b8057a..4c91cadd1871d 100644
--- a/include/trace/events/rpcrdma.h
+++ b/include/trace/events/rpcrdma.h
@@ -917,6 +917,34 @@ TRACE_EVENT(xprtrdma_cb_setup,
 DEFINE_CB_EVENT(xprtrdma_cb_call);
 DEFINE_CB_EVENT(xprtrdma_cb_reply);
 
+TRACE_EVENT(xprtrdma_leaked_rep,
+	TP_PROTO(
+		const struct rpc_rqst *rqst,
+		const struct rpcrdma_rep *rep
+	),
+
+	TP_ARGS(rqst, rep),
+
+	TP_STRUCT__entry(
+		__field(unsigned int, task_id)
+		__field(unsigned int, client_id)
+		__field(u32, xid)
+		__field(const void *, rep)
+	),
+
+	TP_fast_assign(
+		__entry->task_id = rqst->rq_task->tk_pid;
+		__entry->client_id = rqst->rq_task->tk_client->cl_clid;
+		__entry->xid = be32_to_cpu(rqst->rq_xid);
+		__entry->rep = rep;
+	),
+
+	TP_printk("task:%u@%u xid=0x%08x rep=%p",
+		__entry->task_id, __entry->client_id, __entry->xid,
+		__entry->rep
+	)
+);
+
 /**
  ** Server-side RPC/RDMA events
  **/
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index c8ae983c6cc01..f2eaf264726be 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -1360,6 +1360,10 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep)
 	spin_unlock(&xprt->recv_lock);
 
 	req = rpcr_to_rdmar(rqst);
+	if (req->rl_reply) {
+		trace_xprtrdma_leaked_rep(rqst, req->rl_reply);
+		rpcrdma_recv_buffer_put(req->rl_reply);
+	}
 	req->rl_reply = rep;
 	rep->rr_rqst = rqst;
 	clear_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags);
-- 
2.20.1