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From: "janus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/54784] [OOP] allocation of extended types with polymorphic allocatable members
Date: Tue, 02 Oct 2012 21:52:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54784

janus at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
           Keywords|                            |wrong-code
   Last reconfirmed|                            |2012-10-02
                 CC|                            |janus at gcc dot gnu.org
     Ever Confirmed|0                           |1
            Summary|[oop] allocation of         |[OOP] allocation of
                   |extended types with         |extended types with
                   |polymorphic allocatable     |polymorphic allocatable
                   |members                     |members

--- Comment #1 from janus at gcc dot gnu.org 2012-10-02 21:51:49 UTC ---
Thanks for reporting this. I can reproduce it with 4.7 and trunk. Here is a
reduced test case:

program bug
  implicit none

  type :: block
    real, allocatable :: fields
  end type

  type :: list
    class(block),allocatable :: B
  end type

  type :: domain
    type(list),dimension(2) :: L
  end type

  type(domain) :: d
  type(block) :: b1

  allocate(d%L(2)%B,source=b1)

end program  bug 



This fails at runtime with:

Program received signal SIGSEGV: Segmentation fault - invalid memory reference.

Backtrace for this error:
#0  0x7F379D1FDA97
#1  0x7F379D1FE074
#2  0x7F379C72ED9F
#3  0x400804 in __copy_bug_Block at bug.f90:9
#4  0x40097C in bug at bug.f90:19 (discriminator 2)
Segmentation fault


valgrind shows:

==11046== Invalid read of size 8
==11046==    at 0x400804: __copy_bug_Block (bug.f90:9)
==11046==    by 0x40097C: MAIN__ (bug.f90:19)
==11046==    by 0x400A88: main (bug.f90:21)
==11046==  Address 0x0 is not stack'd, malloc'd or (recently) free'd