I have a case with the same issue :
``` nvidia@jetson-b:~$ sudo dkms ldtarball --archive /usr/share/sxpf-dkms/sxpf-2958.dkms.tar.gz ; echo $?
Loading tarball for sxpf-dkms-2958 Creating /var/lib/dkms/sxpf-dkms/2958/source Copying dkms.conf to /var/lib/dkms/sxpf-dkms/2958/source... Loading /var/lib/dkms/sxpf-dkms/2958/4.9.140-tegra/aarch64...
DKMS: ldtarball completed. 1 nvidia@jetson-b:~$ ```
and same problem than the OP.
I have a case with the same issue :
``` sxpf-dkms/ sxpf-2958. dkms.tar. gz ; echo $?
nvidia@jetson-b:~$ sudo dkms ldtarball --archive /usr/share/
Loading tarball for sxpf-dkms-2958 dkms/sxpf- dkms/2958/ source dkms/sxpf- dkms/2958/ source. .. dkms/sxpf- dkms/2958/ 4.9.140- tegra/aarch64. ..
Creating /var/lib/
Copying dkms.conf to /var/lib/
Loading /var/lib/
DKMS: ldtarball completed.
1
nvidia@jetson-b:~$
```
and same problem than the OP.