<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body><div>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 /></div><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 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