Zoltan2: memory leak in Zoltan2's AlgScotch with 32-bit IDs

[kddevin]

Bug Report

@trilinos/zoltan2

Description

@tasmith4 reports a memory leak when running Zoltan2 with 32-bit Scotch.

28 bytes in 1 blocks are definitely lost
==150320== 28 bytes in 1 blocks are definitely lost in loss record 8 of 19
==150320==    at 0x4C2AB28: operator new[](unsigned long) (vg_replace_malloc.c:433)
==150320==    by 0x660773: ASSIGN_ARRAY (Zoltan2_TPLTraits.hpp:98)
==150320==    by 0x660773: Zoltan2::AlgPTScotch::partition(Teuchos::RCP<zoltan2::partitioningsolution > const&) (Zoltan2_AlgScotch.hpp:423)
==150320==    by 0x664DB0: Zoltan2::PartitioningProblem::solve(bool) (Zoltan2_PartitioningProblem.hpp:639)
==150320==    by 0x630BFC: stk::balance::internal::get_multicriteria_graph_based_decomp(stk::mesh::BulkData const&, stk::mesh::Selector, ompi_communicator_t* const&, stk::balance::BalanceSettings const&, stk::mesh::impl::LocalIdMapperT const&, Zoltan2ParallelGraph&, Teuchos::ParameterList&, std::vector<std::pair, std::allocator<std::pair > >&) (privateDeclarations.cpp:816)
==150320==    by 0x63134D: stk::balance::internal::fill_decomp_using_graph_based_method(stk::mesh::BulkData&, std::vector > const&, ompi_communicator_t* const&, int, stk::balance::BalanceSettings const&, std::vector<std::pair, std::allocator<std::pair > >&) (privateDeclarations.cpp:1192)
==150320==    by 0x631B11: stk::balance::internal::calculateGeometricOrGraphBasedDecomp(stk::mesh::BulkData&, std::vector > const&, ompi_communicator_t* const&, int, stk::balance::BalanceSettings const&, std::vector<std::pair, std::allocator<std::pair > >&) (privateDeclarations.cpp:1298)
==150320==    by 0x56A89D: balance_mesh (UnitTestStkBalancePartitioning.cpp:53)
==150320==    by 0x56A89D: StkBalancePartitioning::balance_mesh_scotch(ompi_communicator_t* const&, int, std::vector > const&) (UnitTestStkBalancePartitioning.cpp:74)
==150320==    by 0x567872: StkBalancePartitioning_6Elem1ProcMesh_EntireDomain_Scotch_Test::TestBody() (UnitTestStkBalancePartitioning.cpp:310)
==150320==    by 0x1200909: HandleSehExceptionsInMethodIfSupported (gtest.cc:2433)                          
==150320==    by 0x1200909: void testing::internal::HandleExceptionsInMethodIfSupported(testing::Test*, void (testing::Test::*)(), char const*) (gtest.cc:2469)
==150320==    by 0x11F7730: testing::Test::Run() [clone .part.573] (gtest.cc:2508)
==150320==    by 0x11F7AE1: Run (gtest.cc:2499)
==150320==    by 0x11F7AE1: testing::TestInfo::Run() [clone .part.574] (gtest.cc:2684)
==150320==    by 0x11F7DE4: Run (gtest.cc:2810)
==150320==    by 0x11F7DE4: testing::TestSuite::Run() [clone .part.575] (gtest.cc:2816)
==150320==    by 0x11F8C4A: Run (gtest.cc:5652)
==150320==    by 0x11F8C4A: testing::internal::UnitTestImpl::RunAllTests() (gtest.cc:5338)
==150320==    by 0x11F8DCE: HandleSehExceptionsInMethodIfSupported (gtest.cc:2433)
==150320==    by 0x11F8DCE: HandleExceptionsInMethodIfSupported (gtest.cc:2469)
==150320==    by 0x11F8DCE: testing::UnitTest::Run() (gtest.cc:4925)
==150320==    by 0x431E7D: RUN_ALL_TESTS (gtest.h:2473)
==150320==    by 0x431E7D: run_all_tests (ngp_test.cpp:31)
==150320==    by 0x431E7D: main (UnitTestMain.cpp:76)
==150320==
==150320== LEAK SUMMARY:
==150320==    definitely lost: 28 bytes in 1 blocks
==150320==    indirectly lost: 0 bytes in 0 blocks
==150320==      possibly lost: 0 bytes in 0 blocks
==150320==    still reachable: 17,565 bytes in 7 blocks
==150320==         suppressed: 591 bytes in 18 blocks
==150320== Reachable blocks (those to which a pointer was found) are not shown.
==150320== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==150320==
==150320== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 5 from 5)

Steps to Reproduce

On ascicgpu030, build with gcc7.2, OpenMPI4.0.5, and Scotch with 32-bit IDs (provided by @Tasmit)

Bug is reproducible running Zoltan2 test Zoltan2_Partitioning1.cpp --inputFile=simple --method=scotch