On Tue, Apr 11, 2017 at 01:22:15AM +0100, Al Viro wrote: > * in do_splice_to(): WARN_ON(pipe->nrbufs == pipe->buffers)Hit this one. > * in generic_file_splice_read(): WARN_ON(pipe->nrbufs == pipe->buffers)followed by this one.Then the usual iov_iter trace. Dave