[Bug fortran/81735] [5/6/7/8 Regression] double free or corruption (fasttop) error (SIGABRT) with character(:) and custom return type with allocatable

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81735

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |4.9.3
           Keywords|                            |wrong-code
   Last reconfirmed|                            |2017-09-03
                 CC|                            |pault at gcc dot gnu.org,
                   |                            |vehre at gcc dot gnu.org
     Ever confirmed|0                           |1
            Summary|double free or corruption   |[5/6/7/8 Regression] double
                   |(fasttop) error (SIGABRT)   |free or corruption
                   |with character(:) and       |(fasttop) error (SIGABRT)
                   |custom return type with     |with character(:) and
                   |allocatable                 |custom return type with
                   |                            |allocatable

--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Confirmed from 5.4 up to trunk. The change occurred between revisions r232451 +
1 patch (2016-01-15, OK) and r233563 + 2 patches (2016-02-19, pointer being
freed was not allocated). AFAICT one of the patch is for pr69423 (r233589) and
the second for pr67451 (r233625), but I cannot see why it can cause the
problem.