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Hi Bruce,<br>
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<br>
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The call stack says you called <code>MPI_Intercomm_create</code>. Try get a full stack trace using debugger.<br>
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<br>
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-- <br>
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Hui<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Palmer, Bruce J via discuss <discuss@mpich.org><br>
<b>Sent:</b> Wednesday, March 30, 2022 6:28 PM<br>
<b>To:</b> discuss@mpich.org <discuss@mpich.org><br>
<b>Cc:</b> Palmer, Bruce J <Bruce.Palmer@pnnl.gov><br>
<b>Subject:</b> [mpich-discuss] Error message</font>
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<p class="x_MsoNormal">Does anyone have any idea what the following error message is supposed to be telling me? It appears to be coming from an attempt to make a copy of MPI_COMM_SELF using MPI_Comm_dup.</p>
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<p class="x_p1"><span class="x_s1">Abort(66703622) on node 4 (rank 4 in comm 0): Fatal error in internal_Intercomm_create: Invalid rank, error stack:</span></p>
<p class="x_p1"><span class="x_s1">internal_Intercomm_create(134): MPI_Intercomm_create(comm=0x84000005, 0, comm=0x84000003, 3, 0, newintercomm=0x7fffffffcd68) failed</span></p>
<p class="x_p1"><span class="x_s1">internal_Intercomm_create(102): Local and remote leaders must be different processes</span></p>
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<p class="x_MsoNormal">Bruce Palmer</p>
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