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When send() or recv() returns -1 with errno == EINTR, the code skips the break but still adds the return value to nwritten/nread, making it decrease by 1. This leads to wrong buffer offsets and wrong bytes count. Fix it by explicitly continuing the loop on EINTR, so the return value is only added when it is positive. Fixes:a8ed71a27e("vsock/test: add recv_buf() utility function") Fixes:12329bd51f("vsock/test: add send_buf() utility function") Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Reviewed-by: Luigi Leonardi <leonardi@redhat.com> Link: https://patch.msgid.link/20260403093251.30662-1-sgarzare@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>