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Date:   Mon, 14 Sep 2020 09:03:30 -0400
From:   Sasha Levin <>
Cc:     Chuck Lever <>, Dan Aloni <>,
        Anna Schumaker <>,
        Sasha Levin <>,,
Subject: [PATCH AUTOSEL 5.8 01/29] xprtrdma: Release in-flight MRs on disconnect

From: Chuck Lever <>

[ Upstream commit 5de55ce951a1466e31ff68a7bc6b0a7ce3cb5947 ]

Dan Aloni reports that when a server disconnects abruptly, a few
memory regions are left DMA mapped. Over time this leak could pin
enough I/O resources to slow or even deadlock an NFS/RDMA client.

I found that if a transport disconnects before pending Send and
FastReg WRs can be posted, the to-be-registered MRs are stranded on
the req's rl_registered list and never released -- since they
weren't posted, there's no Send completion to DMA unmap them.

Reported-by: Dan Aloni <>
Signed-off-by: Chuck Lever <>
Signed-off-by: Anna Schumaker <>
Signed-off-by: Sasha Levin <>
 net/sunrpc/xprtrdma/verbs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 75c646743df3e..ca89f24a1590b 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -933,6 +933,8 @@ static void rpcrdma_req_reset(struct rpcrdma_req *req)
+	frwr_reset(req);
 /* ASSUMPTION: the rb_allreqs list is stable for the duration,

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