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commit24ca9a8477upstream. By returning '0' instead of 'EAGAIN' when the tests in xs_nospace() fail to find evidence of socket congestion, we are making the RPC engine believe that the message was incorrectly sent and so it disconnects the socket instead of just retrying. The bug appears to have been introduced by commit5e3771ce2d(SUNRPC: Ensure that xs_nospace return values are propagated). Reported-by: Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Tested-by: Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>