Thanks. This may be related to the OpenBLAS library, see for example
upstream bug report https://savannah.gnu.org/bugs/?47400.

I am unable to reproduce with 4.2.1 on Ubuntu 17.10, but this may be
affected by the specifics of your system or timing.

Can you try again with OpenBLAS multi-threading disabled, with the
following tests:

1. env OMP_NUM_THREADS=1 octave --no-gui

2. sudo update-alternatives --set libblas.so.3-x86_64-linux-gnu 
/usr/lib/x86_64-linux-gnu/blas/libblas.so.3
   sudo update-alternatives --set liblapack.so.3-x86_64-linux-gnu 
/usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3
   octave --no-gui

The names and paths of the blas and lapack alternatives may differ on
your system.

If both of these tests resolve the crash for you, then this looks like
https://savannah.gnu.org/bugs/?47400.

** Bug watch added: GNU Savannah Bug Tracker #47400
   http://savannah.gnu.org/bugs/?47400

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https://bugs.launchpad.net/bugs/1695281

Title:
  GNU octave crashes reliably after a simple input sequence

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