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commit6622e3a731upstream. When we're reusing the backchannel requests instead of freeing them, then we should reinitialise any values of the send/receive xdr_bufs so that they reflect the available space. Fixes:0d2a970d0a("SUNRPC: Fix a backchannel race") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>