<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 src="cid:image043083.png@DFA9542D.FF0DA7D8" 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;" /></td></tr></table></td></tr><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;"><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;color:#000001;font-style:normal;font-weight:400;white-space:nowrap;"><tr style="font-size:14.67px;"><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;">dr. ir. </td><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;">Christiaan</td><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;"> Klaij</td><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;"> | </td><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;">senior researcher</td><td align="left" style="vertical-align:top;font-size:0;"></td></tr></table></td></tr></table></td></tr><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;color:#000001;font-style:normal;font-weight:400;white-space:nowrap;"><tr style="font-size:14.67px;"><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;">Research & Development</td><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;"> | </td><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;">CFD Development</td></tr></table></td></tr><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;"><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;color:#000001;font-style:normal;font-weight:400;white-space:nowrap;"><tr style="font-size:14.67px;"><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;">T <a href="tel:+31%20317%2049%2033%2044" target="_blank" id="LPlnk689713" style="text-decoration:none;color:#000001;">+31 317 49 33 44</a></td><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;"> | </td><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;"><a href="https://urldefense.us/v3/__https://www.marin.nl/__;!!G_uCfscf7eWS!dAFNrWR8FzE9RrQXQAlok1iR_fA-rZdm9JAi-dlnKTnbdNTOTCViw0Nc-jjU4g72I-mhE1x1MZaf8imk4ivm_tE$" target="_blank" id="LPlnk689713" style="text-decoration:none;color:#000001;">www.marin.nl</a></td></tr></table></td></tr></table></td></tr><tr style="font-size:0;"><td align="left" style="vertical-align:top;"><table cellpadding="0" cellspacing="0" border="0" style="border-collapse:collapse;font-size:0;"><tr style="font-size:0;"><td align="left" style="padding:5px 0 0;vertical-align:top;"><table cellpadding="0" cellspacing="0" border="0" style="border-collapse:collapse;font-size:0;"><tr style="font-size:0;"><td align="left" style="vertical-align:top;"><table cellpadding="0" cellspacing="0" border="0" style="border-collapse:collapse;font-size:0;line-height:normal;"><tr style="font-size:0;"><td align="left" style="padding:0 3px 3px 0;vertical-align:top;"><a href="https://urldefense.us/v3/__https://www.facebook.com/marin.wageningen__;!!G_uCfscf7eWS!dAFNrWR8FzE9RrQXQAlok1iR_fA-rZdm9JAi-dlnKTnbdNTOTCViw0Nc-jjU4g72I-mhE1x1MZaf8imkLNCvsiI$" target="_blank" id="LPlnk689713" style="text-decoration:none;"><img src="cid:image954569.png@49DFA882.E1CD8C1D" width="15" height="15" border="0" title="Facebook" alt="Facebook" 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><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:0 3px 3px 0;vertical-align:top;"><a href="https://urldefense.us/v3/__https://www.linkedin.com/company/marin__;!!G_uCfscf7eWS!dAFNrWR8FzE9RrQXQAlok1iR_fA-rZdm9JAi-dlnKTnbdNTOTCViw0Nc-jjU4g72I-mhE1x1MZaf8imkrb79Ay4$" target="_blank" id="LPlnk689713" style="text-decoration:none;"><img src="cid:image488066.png@1F7A9239.290D021B" width="15" height="15" border="0" title="LinkedIn" alt="LinkedIn" style="width:15px;min-width:15px;max-width:15px;height:15px;min-height:15px;max-height:15px;font-size:12px;" /></a></td></tr></table></td><td align="left" style="vertical-align:top;"><table cellpadding="0" cellspacing="0" border="0" style="border-collapse:collapse;font-size:0;line-height:normal;"><tr style="font-size:0;"><td align="left" style="padding:0 3px 3px 0;vertical-align:top;"><a href="https://urldefense.us/v3/__https://www.youtube.com/marinmultimedia__;!!G_uCfscf7eWS!dAFNrWR8FzE9RrQXQAlok1iR_fA-rZdm9JAi-dlnKTnbdNTOTCViw0Nc-jjU4g72I-mhE1x1MZaf8imkJiCoeLw$" target="_blank" id="LPlnk689713" style="text-decoration:none;"><img src="cid:image817580.png@FF60E88E.32F63F08" 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></body></html>