Demo example fails at CP decomposition part

[keceli]

Running the examples/demo/demo fails with the following error:

terminate called after throwing an instance of 'lapack::Error'
  what():  lapack::posv failed
[nwx:3088222] *** Process received signal ***
[nwx:3088222] Signal: Aborted (6)
[nwx:3088222] Signal code:  (-6)
[nwx:3088222] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x42520)[0x7f841ec42520]
[nwx:3088222] [ 1] /lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x12c)[0x7f841ec96a7c]
[nwx:3088222] [ 2] /lib/x86_64-linux-gnu/libc.so.6(raise+0x16)[0x7f841ec42476]
[nwx:3088222] [ 3] /lib/x86_64-linux-gnu/libc.so.6(abort+0xd3)[0x7f841ec287f3]
[nwx:3088222] [ 4] /lib/x86_64-linux-gnu/libstdc++.so.6(+0xa2bbe)[0x7f841f0a2bbe]
[nwx:3088222] [ 5] /lib/x86_64-linux-gnu/libstdc++.so.6(+0xae24c)[0x7f841f0ae24c]
[nwx:3088222] [ 6] /lib/x86_64-linux-gnu/libstdc++.so.6(+0xae2b7)[0x7f841f0ae2b7]
[nwx:3088222] [ 7] /lib/x86_64-linux-gnu/libstdc++.so.6(+0xae518)[0x7f841f0ae518]
[nwx:3088222] [ 8] ./examples/demo/demo(+0x141126)[0x56286f42e126]
[nwx:3088222] [ 9] ./examples/demo/demo(+0x14141b)[0x56286f42e41b]
[nwx:3088222] [10] ./examples/demo/demo(+0x141a11)[0x56286f42ea11]
[nwx:3088222] [11] ./examples/demo/demo(+0x13a09f)[0x56286f42709f]
[nwx:3088222] [12] ./examples/demo/demo(+0x13336f)[0x56286f42036f]
[nwx:3088222] [13] ./examples/demo/demo(+0x5e106)[0x56286f34b106]
[nwx:3088222] [14] ./examples/demo/demo(+0x2dcfc)[0x56286f31acfc]
[nwx:3088222] [15] /lib/x86_64-linux-gnu/libc.so.6(+0x29d90)[0x7f841ec29d90]
[nwx:3088222] [16] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x80)[0x7f841ec29e40]
[nwx:3088222] [17] ./examples/demo/demo(+0x2afe5)[0x56286f317fe5]
[nwx:3088222] *** End of error message ***

Looks like the error happens at compute_rank function. This is not a roadblock or anything, I just encountered this while trying to understand about a different problem and wanted to report it here. Unit tests pass, so I don't think it is a build problem, but I can share the details if needed.