<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body><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!bhLWmMB1f8WaSDbp9K4m6tdMiaSZUO0fz4wfjGqnmEpFXM6dyY0NHVQFP9Rbvo2D9gl117ZjcVyTiAmcs91fyp4$">https://petsc.org/release/faq/</a> for trouble shooting.<br />[1]PETSC ERROR: Petsc Release Version 3.22.4, Mar 01, 2025<br />[1]PETSC ERROR: ./ex2f-cklaij-dbg with 2 MPI process(es) and PETSC_ARCH on login1 by cklaij Thu Jul 10 10:33:33 2025<br />[1]PETSC ERROR: Configure options: --prefix=/home/cklaij/ReFRESCO/trunk/install/extLibs --with-mpi-dir=/cm/shared/apps/openmpi/gcc/5.0.6-debug --with-x=0 --with-mpe=0 --with-debugging=0 --download-superlu_dist=<a href="https://urldefense.us/v3/__https://updates.marin.nl/refresco/libs/superlu_dist-8.1.2.tar.gz__;!!G_uCfscf7eWS!bhLWmMB1f8WaSDbp9K4m6tdMiaSZUO0fz4wfjGqnmEpFXM6dyY0NHVQFP9Rbvo2D9gl117ZjcVyTiAmcEB0dwdE$">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!bhLWmMB1f8WaSDbp9K4m6tdMiaSZUO0fz4wfjGqnmEpFXM6dyY0NHVQFP9Rbvo2D9gl117ZjcVyTiAmcW9tvX1c$">https://updates.marin.nl/refresco/libs/parmetis-4.0.3-p9.tar.gz</a> --download-metis=<a href="https://urldefense.us/v3/__https://updates.marin.nl/refresco/libs/metis-5.1.0-p11.tar.gz__;!!G_uCfscf7eWS!bhLWmMB1f8WaSDbp9K4m6tdMiaSZUO0fz4wfjGqnmEpFXM6dyY0NHVQFP9Rbvo2D9gl117ZjcVyTiAmcI1wRWu4$">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="mso-line-height-rule:exactly;-webkit-text-size-adjust:100%;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;"><tr style="font-size:0;"><td align="left" style="vertical-align:top;"><table cellpadding="0" cellspacing="0" border="0" style="border-collapse:collapse;font-size:0;line-height:normal;"><tr style="font-size:0;"><td align="left" style="padding:10px 0;vertical-align:top;"><img src="cid:image198746.png@26F6914C.35B767CA" width="125" height="40" border="0" alt="" style="width:125px;min-width:125px;max-width:125px;height:40px;min-height:40px;max-height:40px;font-size:0;" 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3px 0;vertical-align:top;"><a href="https://urldefense.us/v3/__https://www.youtube.com/marinmultimedia__;!!G_uCfscf7eWS!bhLWmMB1f8WaSDbp9K4m6tdMiaSZUO0fz4wfjGqnmEpFXM6dyY0NHVQFP9Rbvo2D9gl117ZjcVyTiAmcDphiKcc$" target="_blank" id="LPlnk689713" style="text-decoration:none;"><img src="cid:image269837.png@5EAF7CA0.9F1E7DE7" width="15" height="15" border="0" title="YouTube" alt="YouTube" style="width:15px;min-width:15px;max-width:15px;height:15px;min-height:15px;max-height:15px;font-size:12px;" /></a></td></tr></table></td></tr></table></td></tr></table></td></tr></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 <C.Klaij@marin.nl><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 <junchao.zhang@gmail.com><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 <petsc-users@mcs.anl.gov<mailto:petsc-users@mcs.anl.gov>> 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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