On Thu, Oct 01, 2020 at 03:38:52PM -0700, Eric Biggers wrote: > mutex_lock(&sbi->pipe_mutex); > while (bytes) { > - wr = __kernel_write(file, data, bytes, NULL); > + wr = __kernel_write(file, data, bytes, &file->f_pos); Better loff_t dummy = 0; ... wr = __kernel_write(file, data, bytes, &dummy);