<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""><br class=""></div><blockquote type="cite" class=""><div class="WordSection1" style="page: WordSection1;"><div class="" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;"><span class="" style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);">==1026905== by 0x5317899: MatDestroy (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div class="" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;"><span class="" style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);">==1026905== by 0x5336E58: matdestroy_ (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div class="" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;"><span class="" style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);">==1026905== by 0x1528710: __fsi_MOD_fem_constructmatricespetscexit (fsi.F90:2297)<o:p class=""></o:p></span></div><div class="" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;"><span class="" style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);">==1026905== Address 0x2ce67398 is 11,112 bytes inside an unallocated block of size 11,232 in arena "client"</span></div></div></blockquote><div class=""><br class=""></div> Is it possible that this <span style="color: rgb(31, 73, 125); font-family: Consolas; font-size: 11pt;" class="">__fsi_MOD_fem_constructmatricespetscexit</span> is being called AFTER PetscFinalize()? Perhaps it is defined with a "final" and the compiler/linker schedule it to be called after the program has "completed".<div class=""><br class=""></div><div class=""> This would explain the crash, the valgrind stack frames and why it even does not crash with MPICH. This can happen with C++ destructors in code such as</div><div class=""><br class=""></div><div class=""> MyC++Class my; <-- has a destructor that destroys PETSc objects</div><div class=""> PetscInitialize()</div><div class=""> ....</div><div class=""> PetscFinalize()</div><div class=""> <-- the destructor gets called here and messes with MPI data that no longer exists.</div><div class=""> return 0;</div><div class=""> } </div><div class=""><br class=""><div><div class="">The fix is to force the destructor to be called before PETSc finalize and this can be done with </div><div class=""><br class=""></div><div class=""> PetscInitialize()</div><div class=""> {</div><div class=""> MyC++Class my; <-- has a destructor that destroys PETSc objects</div><div class=""> ....</div><div class=""> <-- the destructor gets called here and everything is fine</div><div class=""> }</div><div class=""> PetscFinalize()</div><div class=""> return 0;</div><div class=""> } </div><div class=""><br class=""></div><div class="">I don't know the details of how Fortran's final is implemented but this is my current guess as to what is happening in your code and you need to somehow arrange for the module final to be called before PetscFinalize().</div><div class=""><br class=""></div><div class=""> Barry</div><div class=""><br class=""></div><div class=""><br class=""></div><blockquote type="cite" class=""><div class="">On Apr 28, 2021, at 7:22 AM, Deij-van Rijswijk, Menno <<a href="mailto:M.Deij@marin.nl" class="">M.Deij@marin.nl</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br class="webkit-block-placeholder"></div><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">The modules have automatic freeing in as much as that when a variable that is local to a subroutine is ALLOCATE'd, it is automatically freed when the subroutine returns. I don't think that is problematic, as MatDestroy is used a lot in the code and normally executes just fine.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">As far as I can see, no specific new communicators are created; MatCreateAIJ or MatCreateSeqAIJ are called with PETSC_COMM_WORLD, resp. PETSC_COMM_SELF as first argument.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">We also run this with the Intel MPI library, which is based on MPICH. There this problem does not occur.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">The Valgrind run did not produce any new insights (at least not for me), I have pasted the relevant bits at the end of this message. I did a run on debug versions of PETSc (v3.14.5) and OpenMPI (v 3.1.2) and I find the following stack trace with line numbers for each frame. Maybe that helps in further pinpointing the problem.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">0x0000155540d11719 in ompi_comm_free (comm=0x483f4e0) at /home/mdeij/build-libs-gnu/superbuild/openmpi/src/ompi/communicator/comm.c:1470<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">1470 if ( ! OMPI_COMM_IS_INTRINSIC((*comm)->c_local_comm)) {<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">Missing separate debuginfos, use: yum debuginfo-install libgcc-8.3.1-5.el8.0.2.x86_64 libgfortran-8.3.1-5.el8.0.2.x86_64 libibumad-47mlnx1-1.47329.x86_64 libibverbs-47mlnx1-1.47329.x86_64 libnl3-3.5.0-1.el8.x86_64 libquadmath-8.3.1-5.el8.0.2.x86_64 librdmacm-47mlnx1-1.47329.x86_64 libstdc++-8.3.1-5.el8.0.2.x86_64 libxml2-2.9.7-7.el8.x86_64 numactl-libs-2.0.12-9.el8.x86_64 opensm-libs-5.5.1.MLNX20191120.0c8dde0-0.1.47329.x86_64 openssl-libs-1.1.1c-15.el8.x86_64 python3-libs-3.6.8-23.el8.x86_64 sssd-client-2.2.3-20.el8.x86_64 ucx-cma-1.7.0-1.47329.x86_64 ucx-ib-1.7.0-1.47329.x86_64 xz-libs-5.2.4-3.el8.x86_64 zlib-1.2.11-16.el8_2.x86_64<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">(gdb) bt<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">#0 0x0000155540d11719 in ompi_comm_free (comm=0x483f4e0) at /home/mdeij/build-libs-gnu/superbuild/openmpi/src/ompi/communicator/comm.c:1470<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">#1 0x0000155540d4f1af in PMPI_Comm_free (comm=0x483f4e0) at pcomm_free.c:62<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">#2 0x000015555346329a in superlu_gridexit (grid=0x483f4e0) at /home/mdeij/install-gnu/extLibs/Linux-x86_64-Intel/superlu_dist-6.3.0/SRC/superlu_grid.c:174<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">#3 0x0000155553ca2ff1 in Petsc_Superlu_dist_keyval_Delete_Fn (comm=0x3921b10, keyval=16, attr_val=0x483f4d0, extra_state=0x0) at /home/mdeij/build-libs-gnu/superbuild/petsc/src/src/mat/impls/aij/mpi/superlu_dist/superlu_dist.c:97<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">#4 0x0000155540d0baa1 in ompi_attr_delete_impl (type=COMM_ATTR, object=0x3921b10, attr_hash=0x377efe0, key=16, predefined=true) at /home/mdeij/build-libs-gnu/superbuild/openmpi/src/ompi/attribute/attribute.c:1062<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">#5 0x0000155540d0c039 in ompi_attr_delete_all (type=COMM_ATTR, object=0x3921b10, attr_hash=0x377efe0) at /home/mdeij/build-libs-gnu/superbuild/openmpi/src/ompi/attribute/attribute.c:1166<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">#6 0x0000155540d11676 in ompi_comm_free (comm=0x7fffffffc5c0) at /home/mdeij/build-libs-gnu/superbuild/openmpi/src/ompi/communicator/comm.c:1462<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">#7 0x0000155540d4f1af in PMPI_Comm_free (comm=0x7fffffffc5c0) at pcomm_free.c:62<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">#8 0x000015555393fb68 in PetscCommDestroy (comm=0x3943a60) at /home/mdeij/build-libs-gnu/superbuild/petsc/src/src/sys/objects/tagm.c:217<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">#9 0x0000155553941e07 in PetscHeaderDestroy_Private (h=0x3943a20) at /home/mdeij/build-libs-gnu/superbuild/petsc/src/src/sys/objects/inherit.c:121<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">#10 0x000015555408edfe in MatDestroy (A=0x3558c18) at /home/mdeij/build-libs-gnu/superbuild/petsc/src/src/mat/interface/matrix.c:1306<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">#11 0x00001555540cb5fa in matdestroy_ (A=0x3558c18, __ierr=0x7fffffffc73c) at /home/mdeij/build-libs-gnu/superbuild/petsc/src/src/mat/interface/ftn-auto/matrixf.c:770<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">Valgrind output:<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== Invalid read of size 1<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== at 0x19184538: PMPI_Comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x6943B61: superlu_gridexit (in /home/mdeij/install-gnu/extLibs/lib/libsuperlu_dist.so.6.3.0)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x56F398E: Petsc_Superlu_dist_keyval_Delete_Fn (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x1912447B: ompi_attr_delete_impl (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x19126FFE: ompi_attr_delete_all (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x1912ACC6: ompi_comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x19184555: PMPI_Comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x4FEE49D: PetscCommDestroy (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x4FF0EE1: PetscHeaderDestroy_Private (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x5317899: MatDestroy (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x5336E58: matdestroy_ (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x1528710: __fsi_MOD_fem_constructmatricespetscexit (fsi.F90:2297)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== Address 0x2ce67398 is 11,112 bytes inside an unallocated block of size 11,232 in arena "client"<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905==<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== Invalid read of size 8<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== at 0x1912AC9A: ompi_comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x19184555: PMPI_Comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x6943B61: superlu_gridexit (in /home/mdeij/install-gnu/extLibs/lib/libsuperlu_dist.so.6.3.0)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x56F398E: Petsc_Superlu_dist_keyval_Delete_Fn (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x1912447B: ompi_attr_delete_impl (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x19126FFE: ompi_attr_delete_all (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x1912ACC6: ompi_comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x19184555: PMPI_Comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x4FEE49D: PetscCommDestroy (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x4FF0EE1: PetscHeaderDestroy_Private (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x5317899: MatDestroy (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x5336E58: matdestroy_ (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== Address 0x2ce673c0 is 11,152 bytes inside an unallocated block of size 11,232 in arena "client"<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905==<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== Invalid read of size 8<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== at 0x19126E5B: ompi_attr_delete_all (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x1912ACC6: ompi_comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x19184555: PMPI_Comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x6943B61: superlu_gridexit (in /home/mdeij/install-gnu/extLibs/lib/libsuperlu_dist.so.6.3.0)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x56F398E: Petsc_Superlu_dist_keyval_Delete_Fn (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x1912447B: ompi_attr_delete_impl (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x19126FFE: ompi_attr_delete_all (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x1912ACC6: ompi_comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x19184555: PMPI_Comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x4FEE49D: PetscCommDestroy (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x4FF0EE1: PetscHeaderDestroy_Private (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x5317899: MatDestroy (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== Address 0x91 is not stack'd, malloc'd or (recently) free'd<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905==<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905==<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== Process terminating with default action of signal 11 (SIGSEGV)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== Access not within mapped region at address 0x91<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== at 0x19126E5B: ompi_attr_delete_all (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x1912ACC6: ompi_comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x19184555: PMPI_Comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x6943B61: superlu_gridexit (in /home/mdeij/install-gnu/extLibs/lib/libsuperlu_dist.so.6.3.0)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x56F398E: Petsc_Superlu_dist_keyval_Delete_Fn (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x1912447B: ompi_attr_delete_impl (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x19126FFE: ompi_attr_delete_all (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x1912ACC6: ompi_comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x19184555: PMPI_Comm_free (in /home/mdeij/install-gnu/extLibs/lib/libmpi.so.40.10.2)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x4FEE49D: PetscCommDestroy (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x4FF0EE1: PetscHeaderDestroy_Private (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== by 0x5317899: MatDestroy (in /home/mdeij/install-gnu/extLibs/lib/libpetsc.so.3.14.5)<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== If you believe this happened as a result of a stack<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== overflow in your program's main thread (unlikely but<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== possible), you can try to increase the size of the<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== main thread stack using the --main-stacksize= flag.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Consolas; color: rgb(31, 73, 125);" class="">==1026905== The main thread stack size used in this run was 16777216.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div class=""></div></div><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><font style="font-style: normal; font-variant-caps: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Verdana; font-size: 8pt; color: rgb(125, 125, 125); font-weight: bold;" class="">dr. ir.</font><font style="font-style: normal; font-variant-caps: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Verdana; font-size: 8pt; color: rgb(125, 125, 125); font-weight: bold;" class=""><span class="Apple-converted-space"> </span></font><font style="font-style: normal; font-variant-caps: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Verdana; font-size: 8pt; color: rgb(125, 125, 125); font-weight: bold;" class="">Menno A.</font><font style="font-style: normal; font-variant-caps: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Verdana; font-size: 8pt; color: rgb(125, 125, 125); font-weight: bold;" class=""><span class="Apple-converted-space"> </span></font><font style="font-style: normal; font-variant-caps: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Verdana; font-size: 8pt; color: rgb(125, 125, 125); font-weight: bold;" class="">Deij-van Rijswijk</font><font size="3" face="Segoe UI" style="caret-color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""></font><font style="font-style: normal; font-variant-caps: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Verdana; font-size: 8pt; color: rgb(125, 125, 125); font-weight: bold;" class=""><span class="Apple-converted-space"> </span>|<span class="Apple-converted-space"> </span></font><font style="font-style: normal; font-variant-caps: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Verdana; font-size: 8pt; color: rgb(125, 125, 125); font-weight: bold;" class="">Researcher</font><font style="font-style: normal; font-variant-caps: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Verdana; font-size: 8pt; color: rgb(125, 125, 125); font-weight: bold;" class=""><span class="Apple-converted-space"> </span>|<span class="Apple-converted-space"> </span></font><font style="font-style: normal; font-variant-caps: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Verdana; font-size: 8pt; color: rgb(125, 125, 125); font-weight: bold;" class="">Research & Development</font><br style="caret-color: rgb(0, 0, 0); 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font-family: Verdana; font-size: 8pt; color: rgb(125, 125, 125);" class=""><span class="Apple-converted-space"> </span>| T<span class="Apple-converted-space"> </span></font><font style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Verdana; font-size: 8pt; color: rgb(125, 125, 125);" class="">+31 317 49 35 06</font><font color="#7d7d7d" size="2" face="Segoe UI" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""></font><font style="caret-color: rgb(0, 0, 0); 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font-size: 12pt; font-family: "Times New Roman", serif;" class=""><b class=""><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif;" class="">From:</span></b><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span class="Apple-converted-space"> </span>Barry Smith <<a href="mailto:bsmith@petsc.dev" style="color: purple; text-decoration: underline;" class="">bsmith@petsc.dev</a>><span class="Apple-converted-space"> </span><br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>Friday, April 23, 2021 7:09 PM<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span>Deij-van Rijswijk, Menno <<a href="mailto:M.Deij@marin.nl" style="color: purple; text-decoration: underline;" class="">M.Deij@marin.nl</a>><br class=""><b class="">Cc:</b><span class="Apple-converted-space"> </span><a href="mailto:petsc-users@mcs.anl.gov" style="color: purple; text-decoration: underline;" class="">petsc-users@mcs.anl.gov</a><br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [petsc-users] MatDestroy problem with multiple matrices and SUPERLU_DIST<o:p class=""></o:p></span></div></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""> Thanks for looking. Do these modules have any "automatic freeing" when variables go out of scope (like C++ classes do)? <o:p class=""></o:p></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""> Do you make specific new MPI communicators to use create the matrices? <o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""> Have you tried MPICH or a different version of OpenMPI. <o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""> Maybe run the program with valgrind. The stack frames you sent look "funny", that is I would not normally expect them to be in such an order.<o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""> Barry</div></div></div></div></blockquote></div><br class=""></div></body></html>