Segfault in examples

[lukashuebner]

On my local system (GCC 9.4.0, OpenMPI Tennessee Version 5.1.0a1), I get a segfault when executing the examples

❯ mpirun --with-ft mpi -np 5 build/examples/02_send_recv/fenix/fenix_ring-debug 2 1
Executing the program with 2 spare ranks. Rank 1 will be killed.
Doing kill, node:1
[i10pc34:536666] *** Process received signal ***
[i10pc34:536666] Signal: Segmentation fault (11)
[i10pc34:536666] Signal code: Address not mapped (1)
[i10pc34:536666] Failing at address: 0x557dac031538
[i10pc34:536666] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x43090)[0x7f10f11ab090]
[i10pc34:536666] [ 1] /home/lukas/ompi-tenesse/lib/libmpi.so.0(PMPI_Type_size+0x1c)[0x7f10f146b69c]
[i10pc34:536666] [ 2] build/examples/02_send_recv/fenix/fenix_ring-debug(+0xa90e)[0x5615bbf4090e]
...
[i10pc34:536666] [ 8] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0x7f10f118c083]
[i10pc34:536666] [ 9] build/examples/02_send_recv/fenix/fenix_ring-debug(+0x280e)[0x5615bbf3880e]
[i10pc34:536666] *** End of error message ***
FAILURE, Fenix_Init error 100
... same messages from another rank ...