Bandwidth test example fails in copy kernels phase with "Invalid resource handles"

[eyalroz]

When running the p2pBandwidthLatencyTest, a modified CUDA sample program, we get:

... snip ...
Testing copy mechanism: Kernels...

Unidirectional P2P=Disabled Bandwidth Matrix (GB/s)
   D\D     0      1      2
     0   0.00   0.00   0.00
     1   0.00   0.00   0.00
     2   0.00   0.00   0.00

terminate called after throwing an instance of 'cuda::runtime_error'
  what():   kernel launch failed for kernel at 0x034a47d0 on stream 0x033d5e70 in context 0x01c871b0 on device 1: invalid resource handle
unused/run-all-examples: line 7: 35177 Aborted                 (core dumped) ./$f

This happens on a machine with multiple Turing GPUs which are P2P-capable (I think).