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[ Upstream commit05258a0a69] Jan Schunk reports that his small NFS servers suffer from memory exhaustion after just a few days. A bisect shows that commite18e157bb5("SUNRPC: Send RPC message on TCP with a single sock_sendmsg() call") is the first bad commit. That commit assumed that sock_sendmsg() releases all the pages in the underlying bio_vec array, but the reality is that it doesn't. svc_xprt_release() releases the rqst's response pages, but the record marker page fragment isn't one of those, so it is never released. This is a narrow fix that can be applied to stable kernels. A more extensive fix is in the works. Reported-by: Jan Schunk <scpcom@gmx.de> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218671 Fixes:e18e157bb5("SUNRPC: Send RPC message on TCP with a single sock_sendmsg() call") Cc: Alexander Duyck <alexander.duyck@gmail.com> Cc: Jakub Kacinski <kuba@kernel.org> Cc: David Howells <dhowells@redhat.com> Reviewed-by: David Howells <dhowells@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>