<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div><br></div> I cannot reproduce<br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On Jul 10, 2025, at 3:46 PM, Junchao Zhang <junchao.zhang@gmail.com> wrote:</div><br class="Apple-interchange-newline"><div><div dir="ltr"><div>Adding -mca coll_hcoll_enable 0 didn't change anything at my end. Strange. </div><div><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">--Junchao Zhang</div></div></div><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Thu, Jul 10, 2025 at 3:39 AM Klaij, Christiaan <<a href="mailto:C.Klaij@marin.nl">C.Klaij@marin.nl</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div>An additional clue perhaps: with the option OMPI_MCA_coll_hcoll_enable=0, the code does not hang but gives the error below.<br><br>Chris<br><br><br>$ mpirun -mca coll_hcoll_enable 0 -n 2 ./ex2f-cklaij-dbg -pc_type jacobi -ksp_monitor_short -ksp_gmres_cgs_refinement_type refine_always<br> 0 KSP Residual norm 1.11803<br> 1 KSP Residual norm 0.591608<br> 2 KSP Residual norm 0.316228<br> 3 KSP Residual norm < 1.e-11<br> 0 KSP Residual norm 0.707107<br> 1 KSP Residual norm 0.408248<br> 2 KSP Residual norm < 1.e-11<br>Norm of error < 1.e-12 iterations 3<br>[1]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------<br>[1]PETSC ERROR: General MPI error<br>[1]PETSC ERROR: MPI error 1 MPI_ERR_BUFFER: invalid buffer pointer<br>[1]PETSC ERROR: See <a href="https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!cbfMf1uAUCQ_T756UiU6Vd_NZkAvFLYRqJzL47P2JiAVi_2KCG5Q1u2oHseUcGLNAIW5qWtWbWHMIk_YNR8bJjkYxsN9$" target="_blank">https://petsc.org/release/faq/</a> for trouble shooting.<br>[1]PETSC ERROR: Petsc Release Version 3.22.4, Mar 01, 2025<br>[1]PETSC ERROR: ./ex2f-cklaij-dbg with 2 MPI process(es) and PETSC_ARCH on login1 by cklaij Thu Jul 10 10:33:33 2025<br>[1]PETSC ERROR: Configure options: --prefix=/home/cklaij/ReFRESCO/trunk/install/extLibs --with-mpi-dir=/cm/shared/apps/openmpi/gcc/5.0.6-debug --with-x=0 --with-mpe=0 --with-debugging=0 --download-superlu_dist=<a href="https://urldefense.us/v3/__https://updates.marin.nl/refresco/libs/superlu_dist-8.1.2.tar.gz__;!!G_uCfscf7eWS!cbfMf1uAUCQ_T756UiU6Vd_NZkAvFLYRqJzL47P2JiAVi_2KCG5Q1u2oHseUcGLNAIW5qWtWbWHMIk_YNR8bJkouVHb2$" target="_blank">https://updates.marin.nl/refresco/libs/superlu_dist-8.1.2.tar.gz</a> --with-blaslapack-dir=/cm/shared/apps/oneapi/2024.2.1/mkl/2024.2 --download-parmetis=<a href="https://urldefense.us/v3/__https://updates.marin.nl/refresco/libs/parmetis-4.0.3-p9.tar.gz__;!!G_uCfscf7eWS!cbfMf1uAUCQ_T756UiU6Vd_NZkAvFLYRqJzL47P2JiAVi_2KCG5Q1u2oHseUcGLNAIW5qWtWbWHMIk_YNR8bJrjo6-SP$" target="_blank">https://updates.marin.nl/refresco/libs/parmetis-4.0.3-p9.tar.gz</a> --download-metis=<a href="https://urldefense.us/v3/__https://updates.marin.nl/refresco/libs/metis-5.1.0-p11.tar.gz__;!!G_uCfscf7eWS!cbfMf1uAUCQ_T756UiU6Vd_NZkAvFLYRqJzL47P2JiAVi_2KCG5Q1u2oHseUcGLNAIW5qWtWbWHMIk_YNR8bJhCc9MRE$" target="_blank">https://updates.marin.nl/refresco/libs/metis-5.1.0-p11.tar.gz</a> --with-packages-build-dir=/home/cklaij/ReFRESCO/trunk/build-extlibs/superbuild --with-ssl=0 --with-shared-libraries=1 CFLAGS="-std=gnu11 -Wall -funroll-all-loops -O3 -DNDEBUG" CXXFLAGS="-std=gnu++14 -Wall -funroll-all-loops -O3 -DNDEBUG " COPTFLAGS="-std=gnu11 -Wall -funroll-all-loops -O3 -DNDEBUG" CXXOPTFLAGS="-std=gnu++14 -Wall -funroll-all-loops -O3 -DNDEBUG " FCFLAGS="-Wall -funroll-all-loops -ffree-line-length-0 -Wno-maybe-uninitialized -Wno-target-lifetime -Wno-unused-function -O3 -DNDEBUG" F90FLAGS="-Wall -funroll-all-loops -ffree-line-length-0 -Wno-maybe-uninitialized -Wno-target-lifetime -Wno-unused-function -O3 -DNDEBUG" FOPTFLAGS="-Wall -funroll-all-loops -ffree-line-length-0 -Wno-maybe-uninitialized -Wno-target-lifetime -Wno-unused-function -O3 -DNDEBUG"<br>[1]PETSC ERROR: #1 PetscLogNestedTreePrintLine() at /home/cklaij/ReFRESCO/trunk/build-extlibs/superbuild/petsc/src/src/sys/logging/handler/impls/nested/xmlviewer.c:289<br>[1]PETSC ERROR: #2 PetscLogNestedTreePrint() at /home/cklaij/ReFRESCO/trunk/build-extlibs/superbuild/petsc/src/src/sys/logging/handler/impls/nested/xmlviewer.c:377<br>[1]PETSC ERROR: #3 PetscLogNestedTreePrint() at /home/cklaij/ReFRESCO/trunk/build-extlibs/superbuild/petsc/src/src/sys/logging/handler/impls/nested/xmlviewer.c:384<br>[1]PETSC ERROR: #4 PetscLogNestedTreePrintTop() at /home/cklaij/ReFRESCO/trunk/build-extlibs/superbuild/petsc/src/src/sys/logging/handler/impls/nested/xmlviewer.c:420<br>[1]PETSC ERROR: #5 PetscLogHandlerView_Nested_XML() at /home/cklaij/ReFRESCO/trunk/build-extlibs/superbuild/petsc/src/src/sys/logging/handler/impls/nested/xmlviewer.c:443<br>[1]PETSC ERROR: #6 PetscLogHandlerView_Nested() at /home/cklaij/ReFRESCO/trunk/build-extlibs/superbuild/petsc/src/src/sys/logging/handler/impls/nested/lognested.c:405<br>[1]PETSC ERROR: #7 PetscLogHandlerView() at /home/cklaij/ReFRESCO/trunk/build-extlibs/superbuild/petsc/src/src/sys/logging/handler/interface/loghandler.c:342<br>[1]PETSC ERROR: #8 PetscLogView() at /home/cklaij/ReFRESCO/trunk/build-extlibs/superbuild/petsc/src/src/sys/logging/plog.c:2040<br>[1]PETSC ERROR: #9 ex2f-cklaij-dbg.F90:301<br>--------------------------------------------------------------------------<br>MPI_ABORT was invoked on rank 0 in communicator MPI_COMM_SELF<br> Proc: [[55228,1],1]<br> Errorcode: 98<br><br>NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.<br>You may or may not see output from other processes, depending on<br>exactly when Open MPI kills them.<br>--------------------------------------------------------------------------<br>--------------------------------------------------------------------------<br>prterun has exited due to process rank 1 with PID 0 on node login1 calling<br>"abort". This may have caused other processes in the application to be<br>terminated by signals sent by prterun (as reported here).<br>--------------------------------------------------------------------------<br><br>________________________________________<div dir="ltr" style="font-size:1px;direction:ltr"><table dir="ltr" cellpadding="0" cellspacing="0" border="0" style="width:100%;direction:ltr;border-collapse:collapse;font-size:1px"><tbody><tr style="font-size:0px"><td align="left" style="vertical-align:top"><table cellpadding="0" cellspacing="0" border="0" style="border-collapse:collapse;font-size:0px;line-height:normal"><tbody><tr style="font-size:0px"><td align="left" style="padding:10px 0px;vertical-align:top"><span id="cid:ii_197f5df117074966e3f1"><image198746.png></span></td></tr></tbody></table></td></tr><tr style="font-size:0px"><td align="left" style="vertical-align:top"><table cellpadding="0" cellspacing="0" border="0" style="border-collapse:collapse;font-size:0px"><tbody><tr 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id="cid:ii_197f5df11704733395d4"><image269837.png></span></a></td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table><span style="font-family:remialcxesans"> <span style="font-family:template-zjzHWwipEfCqpwAiSIGong"> </span><span style="font-family:zone-1"> </span><span style="font-family:zones-AQ"> </span></span></div><br>From: Klaij, Christiaan <<a href="mailto:C.Klaij@marin.nl" target="_blank">C.Klaij@marin.nl</a>><br>Sent: Thursday, July 10, 2025 10:15 AM<br>To: Junchao Zhang<br>Cc: PETSc users list<br>Subject: Re: [petsc-users] problem with nested logging, standalone example<br><br>Hi Junchao,<br><br>Thanks for testing. I've fixed the error but unfortunately that doesn't change the behavior, the code still hangs as before, with the same stack trace...<br><br>Chris<br><br>________________________________________<br>From: Junchao Zhang <<a href="mailto:junchao.zhang@gmail.com" target="_blank">junchao.zhang@gmail.com</a>><br>Sent: Tuesday, July 8, 2025 10:58 PM<br>To: Klaij, Christiaan<br>Cc: PETSc users list<br>Subject: Re: [petsc-users] problem with nested logging, standalone example<br><br>Hi, Chris,<br> First, I had to fix an error in your test by adding " PetscCallA(MatSetFromOptions(AA,ierr))" at line 254.<br>[0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------<br>[0]PETSC ERROR: Object is in wrong state<br>[0]PETSC ERROR: Mat object's type is not set: Argument # 1<br>...<br>[0]PETSC ERROR: #1 MatSetValues() at /scratch/jczhang/petsc/src/mat/interface/matrix.c:1503<br>[0]PETSC ERROR: #2 ex2f.F90:258<br><br>Then I could ran the test without problems<br>mpirun -n 2 ./ex2f -pc_type jacobi -ksp_monitor_short -ksp_gmres_cgs_refinement_type refine_always<br> 0 KSP Residual norm 1.11803<br> 1 KSP Residual norm 0.591608<br> 2 KSP Residual norm 0.316228<br> 3 KSP Residual norm < 1.e-11<br> 0 KSP Residual norm 0.707107<br> 1 KSP Residual norm 0.408248<br> 2 KSP Residual norm < 1.e-11<br>Norm of error < 1.e-12 iterations 3<br><br>I used petsc-3.22.4, gcc-11.3, openmpi-5.0.6 and configured with<br>./configure --with-cc=gcc --with-cxx=g++ --with-fc=gfortran --download-openmpi --with-ssl=0 --with-shared-libraries=1 CFLAGS="-std=gnu11 -Wall -funroll-all-loops -O3 -DNDEBUG" CXXFLAGS="-std=gnu++14 -Wall -funroll-all-loops -O3 -DNDEBUG " COPTFLAGS="-std=gnu11 -Wall -funroll-all-loops -O3 -DNDEBUG" CXXOPTFLAGS="-std=gnu++14 -Wall -funroll-all-loops -O3 -DNDEBUG " FCFLAGS="-Wall -funroll-all-loops -ffree-line-length-0 -Wno-maybe-uninitialized -Wno-target-lifetime -Wno-unused-function -O3 -DNDEBUG" F90FLAGS="-Wall -funroll-all-loops -ffree-line-length-0 -Wno-maybe-uninitialized -Wno-target-lifetime -Wno-unused-function -O3 -DNDEBUG" FOPTFLAGS="-Wall -funroll-all-loops -ffree-line-length-0 -Wno-maybe-uninitialized -Wno-target-lifetime -Wno-unused-function -O3 -DNDEBUG"<br><br>Could you fix the error and retry?<br><br>--Junchao Zhang<br><br><br>On Sun, Jul 6, 2025 at 12:57 PM Klaij, Christiaan via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a><mailto:<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a>>> wrote:<br>Attached is a standalone example of the issue described in the<br>earlier thread "problem with nested logging". The issue appeared<br>somewhere between petsc 3.19.4 and 3.23.4.<br><br>The example is a variation of ../ksp/tutorials/ex2f.F90, where<br>I've added the nested log viewer with one event as well as the<br>solution of a small system on rank zero.<br><br>When running on mulitple procs the example hangs during<br>PetscLogView with the backtrace below. The configure.log is also<br>attached in the hope that you can replicate the issue.<br><br>Chris<br><br><br>#0 0x000015554c84ea9e in mca_pml_ucx_recv (buf=0x7fffffff9e30, count=1,<br>datatype=0x15554c9ef900 <ompi_mpi_2dblprec>, src=1, tag=-12,<br>comm=0x7f1e30, mpi_status=0x0) at pml_ucx.c:700<br>#1 0x000015554c65baff in ompi_coll_base_allreduce_intra_recursivedoubling (<br>sbuf=0x7fffffff9e20, rbuf=0x7fffffff9e30, count=1,<br>dtype=0x15554c9ef900 <ompi_mpi_2dblprec>,<br>op=0x15554ca28980 <ompi_mpi_op_maxloc>, comm=0x7f1e30, module=0xaec630)<br>at base/coll_base_allreduce.c:247<br>#2 0x000015554c6a7e40 in ompi_coll_tuned_allreduce_intra_do_this (<br>sbuf=0x7fffffff9e20, rbuf=0x7fffffff9e30, count=1,<br>dtype=0x15554c9ef900 <ompi_mpi_2dblprec>,<br>op=0x15554ca28980 <ompi_mpi_op_maxloc>, comm=0x7f1e30, module=0xaec630,<br>algorithm=3, faninout=0, segsize=0) at coll_tuned_allreduce_decision.c:142<br>#3 0x000015554c6a054f in ompi_coll_tuned_allreduce_intra_dec_fixed (<br>sbuf=0x7fffffff9e20, rbuf=0x7fffffff9e30, count=1,<br>dtype=0x15554c9ef900 <ompi_mpi_2dblprec>,<br>op=0x15554ca28980 <ompi_mpi_op_maxloc>, comm=0x7f1e30, module=0xaec630)<br>at coll_tuned_decision_fixed.c:216<br>#4 0x000015554c68e160 in mca_coll_hcoll_allreduce (sbuf=0x7fffffff9e20,<br>rbuf=0x7fffffff9e30, count=1, dtype=0x15554c9ef900 <ompi_mpi_2dblprec>,<br>op=0x15554ca28980 <ompi_mpi_op_maxloc>, comm=0x7f1e30, module=0xaecb80)<br>at coll_hcoll_ops.c:217<br>#5 0x000015554c59811a in PMPI_Allreduce (sendbuf=0x7fffffff9e20,<br>recvbuf=0x7fffffff9e30, count=1, datatype=0x15554c9ef900 <ompi_mpi_2dblprec>, op=0x15554ca28980 <ompi_mpi_op_maxloc>, comm=0x7f1e30) at allreduce.c:123<br>#6 0x0000155553eabede in MPIU_Allreduce_Private () from /home/cklaij/ReFRESCO/trunk/install/extLibs/lib/libpetsc.so.3.22<br>#7 0x0000155553e50d08 in PetscPrintXMLNestedLinePerfResults () from /home/cklaij/ReFRESCO/trunk/install/extLibs/lib/libpetsc.so.3.22<br>#8 0x0000155553e5123e in PetscLogNestedTreePrintLine () from /home/cklaij/ReFRESCO/trunk/install/extLibs/lib/libpetsc.so.3.22<br>#9 0x0000155553e51f3a in PetscLogNestedTreePrint () from /home/cklaij/ReFRESCO/trunk/install/extLibs/lib/libpetsc.so.3.22<br>#10 0x0000155553e51e96 in PetscLogNestedTreePrint () from /home/cklaij/ReFRESCO/trunk/install/extLibs/lib/libpetsc.so.3.22<br>#11 0x0000155553e51e96 in PetscLogNestedTreePrint () from /home/cklaij/ReFRESCO/trunk/install/extLibs/lib/libpetsc.so.3.22<br>#12 0x0000155553e52142 in PetscLogNestedTreePrintTop () from /home/cklaij/ReFRESCO/trunk/install/extLibs/lib/libpetsc.so.3.22<br>#13 0x0000155553e5257b in PetscLogHandlerView_Nested_XML () from /home/cklaij/ReFRESCO/trunk/install/extLibs/lib/libpetsc.so.3.22<br>#14 0x0000155553e4e5a0 in PetscLogHandlerView_Nested () from /home/cklaij/ReFRESCO/trunk/install/extLibs/lib/libpetsc.so.3.22<br>#15 0x0000155553e56232 in PetscLogHandlerView () from /home/cklaij/ReFRESCO/trunk/install/extLibs/lib/libpetsc.so.3.22<br>#16 0x0000155553e588c3 in PetscLogView () from /home/cklaij/ReFRESCO/trunk/install/extLibs/lib/libpetsc.so.3.22<br>#17 0x0000155553e40eb5 in petsclogview_ () from /home/cklaij/ReFRESCO/trunk/install/extLibs/lib/libpetsc.so.3.22<br>#18 0x0000000000402c8b in MAIN__ ()<br>#19 0x00000000004023df in main ()<br>[cid:ii_197ebccaa1d27ee6ef21]<br>dr. ir. 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