{"id":457633,"date":"2026-05-06T04:05:16","date_gmt":"2026-05-06T04:05:16","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/signal-11-segmentation-violation-in-custom-built-mpp-r162\/"},"modified":"2026-05-06T04:05:16","modified_gmt":"2026-05-06T04:05:16","slug":"signal-11-segmentation-violation-in-custom-built-mpp-r162","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/signal-11-segmentation-violation-in-custom-built-mpp-r162\/","title":{"rendered":"Signal 11 Segmentation Violation in Custom-Built MPP R16.2"},"content":{"rendered":"

<div>Hi everyone,<\/div><div> <\/div><div>I am encountering a Signal 11 (Segmentation Violation)<\/strong> during MPP initialization that occurs only with my custom-built LS-DYNA R16.2 executable<\/strong>, while the standard Ansys-distributed binary runs the identical keyword file to normal termination without any errors.<\/div><div> <\/div><div>Environment & Executables<\/strong><\/div><div>- Custom build:<\/strong> mppdyna.exe<\/code> compiled from the R16.2 source makefile (Intel Fortran 19.0 + Intel MPI 2019.6.166, double precision I8R8, WINX64). I did not modify any source files or build flags<\/strong> — I simply ran the default makefile to verify that the custom library would execute without errors.<\/div><div>- Standard binary:<\/strong> lsdyna_mpp_sp_msmpi.exe<\/code> (Ansys-distributed) — same keyword file, same machine, same MPI run command<\/strong> completes successfully with normal termination.<\/div><div>- Version:<\/strong> LS-DYNA R16.2-151-g276cb33db2<\/div><div> <\/div><div>Problem Summary<\/strong><\/div><div>When I run the custom mppdyna.exe<\/code> with thermal properties included, the solver crashes immediately after initialization:<\/div><div> <\/div><div><\/code><\/div><div>initialization completed<\/div><div>>>>>>&nbsp; Process 0&nbsp; <<<<<<\/div><div>>>>>> Signal 11 : Segmentation Violation <<<<<<\/div><div><\/code><\/code><\/div><div> <\/div><div>The crash happens at Problem cycle = 0<\/strong>, right after MPP decomposition and initialization finish. No d3plot or binout data is written beyond the initial state.<\/div><div> <\/div><div>Critical Observation: Thermal Dependency<\/strong><\/div><div>- With thermal cards active:<\/strong> The custom MPP executable segfaults every time (tested with -n 1<\/code> and -n 2<\/code>).<\/div><div>- Without thermal cards:<\/strong> The custom MPP executable runs perfectly fine to normal termination.<\/div><div>- With thermal cards + standard Ansys binary:<\/strong> Runs perfectly fine to normal termination.<\/div><div> <\/div><div>This strongly suggests the issue is tied to how the custom-built executable handles thermal initialization in an MPP + S-ALE environment<\/strong>, rather than a keyword syntax error.<\/div><div> <\/div><div>Keyword Cards Used in the Mode<\/strong>l<\/div><div>The simulation is a 2D axisymmetric S-ALE hypervelocity impact problem using the following cards:<\/div><div> <\/div><div>- *KEYWORD<\/code>, *TITLE<\/code><\/div><div>- *MAT_ELASTIC_PLASTIC_HYDRO_TITLE<\/code> (HSLA 100 Steel, Tungsten Carbide)<\/div><div>- *MAT_ALE_VACUUM_TITLE<\/code><\/div><div>- *MAT_THERMAL_ISOTROPIC_PHASE_CHANGE_TITLE<\/code> (Steel)<\/div><div>- *MAT_THERMAL_ISOTROPIC_TITLE<\/code> (Tungsten Carbide, Vacuum)<\/div><div>- *EOS_GRUNEISEN_TITLE<\/code><\/div><div>- *NODE<\/code><\/div><div>- *ALE_STRUCTURED_MESH<\/code>, *ALE_STRUCTURED_MESH_CONTROL_POINTS<\/code><\/div><div>- *ALE_MULTI-MATERIAL_GROUP<\/code><\/div><div>- *ALE_STRUCTURED_MESH_VOLUME_FILLING<\/code> (ALL, BOXCOR, ELLIPSOID)<\/div><div>- *PART<\/code>, *SECTION_ALE2D_TITLE<\/code><\/div><div>- *INITIAL_TEMPERATURE_SET<\/code><\/div><div>- *DEFINE_BOX_TITLE<\/code>, *DEFINE_VECTOR_TITLE<\/code><\/div><div>- *BOUNDARY_SALE_MESH_FACE<\/code> (SYM, NONREFL)<\/div><div>- *SET_PART_LIST_TITLE<\/code><\/div><div>- *CONTROL_ALE<\/code>, *CONTROL_BULK_VISCOSITY<\/code>, *CONTROL_ENERGY<\/code>, *CONTROL_HOURGLASS<\/code><\/div><div>- *CONTROL_MPP_DECOMPOSITION_DISTRIBUTE_ALE_ELEMENTS<\/code><\/div><div>- *CONTROL_SOLUTION<\/code>, *CONTROL_TERMINATION<\/code><\/div><div>- *CONTROL_THERMAL_NONLINEAR<\/code>, *CONTROL_THERMAL_SOLVER<\/code>, *CONTROL_THERMAL_TIMESTEP<\/code><\/div><div>- *CONTROL_TIMESTEP<\/code>, *CONTROL_UNITS<\/code><\/div><div>- *DATABASE_<\/code> family (D3PLOT<\/code>, D3THDT<\/code>, GLSTAT<\/code>, MATSUM<\/code>, NODOUT<\/code>, TPRINT<\/code>, etc.)<\/div><div>- *DATABASE_EXTENT_BINARY<\/code><\/div><div>- *END<\/code><\/div><div> <\/div><div>Run Command (Custom — Fails)<\/strong><\/div><div><\/code>bash<\/div><div>mpiexec -n 2 "...\\mppdyna.exe" i="sale_shot10_umat44v_T09-fine.k" memory=200m<\/div><div><\/code><\/code><\/div><div> <\/div><div>Run Command (Standard — Succeeds)<\/strong><\/div><div><\/code>bash<\/div><div>mpiexec -n 2 "...\\lsdyna_mpp_sp_msmpi.exe" i="sale_shot10_umat44v_T09-fine.k" memory=200m<\/div><div><\/code><\/code><\/div><div> <\/div><div>Question<\/strong><\/div><div>Since the standard Ansys MPP binary handles the identical thermal + S-ALE setup without issue, but the default, unmodified custom build crashes during thermal initialization<\/strong>, what could be causing this? Is there a known compiler\/MPI flag, preprocessor directive, or library linkage issue in the R16.2 makefile that affects thermal solver initialization in MPP mode? Any guidance on resolving this would be greatly appreciated.<\/div><div> <\/div><div>Thanks,<\/div><div>Amrith<\/div><\/p>\n","protected":false},"template":"","class_list":["post-457633","topic","type-topic","status-publish","hentry","topic-tag-create-custom-model"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27814"],"_bbp_topic_id":["457633"],"_bbp_subscription":["270765"],"_bbp_author_ip":["38.95.247.16"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["457633"],"_bbp_last_active_time":["2026-05-06 04:05:16"],"_bbp_reply_count":["0"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["1"],"_bbp_engagement":["270765"],"_btv_view_count":["102"],"_bbp_topic_status":["unanswered"],"_bbp_notification_enabled":["270765"]},"test":"amrithmabuffalo-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/457633","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/457633\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=457633"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}