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[ Upstream commitc34d999ca3] The rxperf RPCs seem to have a magic cookie at the end of the request that was failing to be taken account of by the unmarshalling of the request. Fix the rxperf code to expect this. Fixes:75bfdbf2fc("rxrpc: Implement an in-kernel rxperf server for testing purposes") Signed-off-by: David Howells <dhowells@redhat.com> cc: Marc Dionne <marc.dionne@auristor.com> cc: Simon Horman <horms@kernel.org> cc: linux-afs@lists.infradead.org Link: https://patch.msgid.link/20250218192250.296870-2-dhowells@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>