(Oh!  For some reason I am not getting all of the bug mail from
Launchpad.  At least: I missed notifications about this bug.)

Hm...  It seems that free() on Ubuntu checks that nothing was written
outside of the allocated space?  Does malloc() put a "canary" at the
tail?

Anyway, I am pretty sure that the patch attached to bug #1641592 will
fix this crash.  It is same patch as the second one attached to
https://lists.gnu.org/archive/html/nano-devel/2016-04/msg00075.html,
which was applied upstream nearly a year ago.

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https://bugs.launchpad.net/bugs/1572807

Title:
  /bin/nano:*** Error in `nano': double free or corruption (!prev): ADDR
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