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http://www.fenics.org/cgi-bin/bugzilla/show_bug.cgi?id=40

           Summary: Memory leaked after (sub) DofMap extraction
           Product: DOLFIN
           Version: development version
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: general
        AssignedTo: dolfin-dev@xxxxxxxxxx
        ReportedBy: dag@xxxxxxxxxx


This leak is seen eg. in the Stokes demo using Valgrind. It originates from
where sub functions are extracted and appears to be a sub_dof_map not freed on
line 132 of DofMap.cpp. This is in an area of Dolfin where I'm not familiar
enough to suggest a fix.

/Dag

==32003== 8 bytes in 1 blocks are definitely lost in loss record 2 of 11
==32003==    at 0x4023294: operator new(unsigned) (vg_replace_malloc.c:224)
==32003==    by 0x8080E1F:
UFC_StokesBilinearForm_dof_map_0::create_sub_dof_map(unsigned) const
(Stokes.h:6751)
==32003==    by 0x40E3DDB: dolfin::DofMap::extractDofMap(ufc::dof_map const&,
unsigned&, dolfin::Array<unsigned> const&) const (DofMap.cpp:132)
==32003==    by 0x40E3FF1:
dolfin::DofMap::extractDofMap(dolfin::Array<unsigned> const&, unsigned&) const
(DofMap.cpp:93)
==32003==    by 0x411032B:
dolfin::DiscreteFunction::DiscreteFunction(dolfin::SubFunction&)
(DiscreteFunction.cpp:94)
==32003==    by 0x4108A12: dolfin::Function::operator=(dolfin::SubFunction)
(Function.cpp:209)
==32003==    by 0x41F5405: dolfin::LinearPDE::solve(dolfin::Function&,
dolfin::Function&) (LinearPDE.cpp:110)
==32003==    by 0x80660A1: main (main.cpp:86)


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