linux-kernel - [PATCH 0/2] sunrpc: fix handling of rq_bvec array in svc

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Message-Id: <20251008-rq_bvec-v1-0-7f23d32d75e5@kernel.org>
Date: Wed, 08 Oct 2025 14:58:51 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Chuck Lever <chuck.lever@...cle.com>, NeilBrown <neil@...wn.name>, 
 Olga Kornievskaia <okorniev@...hat.com>, Dai Ngo <Dai.Ngo@...cle.com>, 
 Tom Talpey <tom@...pey.com>, Trond Myklebust <trondmy@...nel.org>, 
 Anna Schumaker <anna@...nel.org>, "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
 David Howells <dhowells@...hat.com>
Cc: linux-nfs@...r.kernel.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Jeff Layton <jlayton@...nel.org>
Subject: [PATCH 0/2] sunrpc: fix handling of rq_bvec array in svc_rqst

I've seen this message pop intermittently on some knfsd servers:

    rpc-srv/tcp: nfsd: sent 1045870 when sending 1045868 bytes - shutting down socket

Unfortunately, I've not been able to reproduce this on my own, but I've
noticed a bug that could cause this.

The first patch in this series fixes a bug in rq_bvec handling I noticed
by inspection. The second patch adds a slot to rq_bvec to account for
the slot used for the TCP record marker.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
Jeff Layton (2):
      sunrpc: account for TCP record marker in rq_bvec array when sending
      sunrpc: add a slot to rqstp->rq_bvec for TCP record marker

 fs/nfsd/vfs.c        | 6 +++---
 net/sunrpc/svc.c     | 3 ++-
 net/sunrpc/svcsock.c | 2 +-
 3 files changed, 6 insertions(+), 5 deletions(-)
---
base-commit: 177818f176ef904fb18d237d1dbba00c2643aaf2
change-id: 20251008-rq_bvec-b66afd0fdbbb

Best regards,
-- 
Jeff Layton <jlayton@...nel.org>