Bus errors on mips64el during tests

[olebole]

During recent rebuilds of the sopt Debian package, I observe a number of bus errors when running the tests:

      Start 19: communicator
16/22 Test #19: communicator .....................Bus error***Exception:   0.50 sec
[mipsel-sil-01:23729] *** Process received signal ***
[mipsel-sil-01:23729] Signal: Bus error (10)
[mipsel-sil-01:23729] Signal code:  (128)
[mipsel-sil-01:23729] Failing at address: (nil)
[mipsel-sil-01:23729] *** End of error message ***

      Start 20: serial_vs_parallel_padmm
17/22 Test #20: serial_vs_parallel_padmm .........Bus error***Exception:   0.42 sec
[mipsel-sil-01:23736] *** Process received signal ***
[mipsel-sil-01:23736] Signal: Bus error (10)
[mipsel-sil-01:23736] Signal code:  (128)
[mipsel-sil-01:23736] Failing at address: (nil)
[mipsel-sil-01:23736] *** End of error message ***

      Start 21: mpi_wavelets
18/22 Test #21: mpi_wavelets .....................Bus error***Exception:   0.44 sec
[mipsel-sil-01:23743] *** Process received signal ***
[mipsel-sil-01:23743] Signal: Bus error (10)
[mipsel-sil-01:23743] Signal code:  (128)
[mipsel-sil-01:23743] Failing at address: (nil)
[mipsel-sil-01:23743] *** End of error message ***

      Start 22: mpi_session
19/22 Test #22: mpi_session ......................Bus error***Exception:   0.34 sec
[mipsel-sil-01:23750] *** Process received signal ***
[mipsel-sil-01:23750] Signal: Bus error (10)
[mipsel-sil-01:23750] Signal code:  (128)
[mipsel-sil-01:23750] Failing at address: (nil)
[mipsel-sil-01:23750] *** End of error message ***

Full build log here. I will try to run it in gdb to get more detailed info here. Similarly, I get errors on HP-PA (same tests, but the message is "ILLEGAL").

This is also reported as Debian#979085, with the following additional comment by @zshj:

The failed tests seem all related mpi, so I think it's not related to spdlog or fmtlib. openmpi bumped its version from 4.0.5 to 4.1.0 on 2020-12-21. I guess it's related to this change of openmpi.

[olebole]

It looks like that the problem is in MPI and not in sopt, so I am closing this. See the Debian bug for further development.