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Hi, I think there is a bug in MPIDI_IPC_rndv_cts_cb (ipc_control. c). When you do rendezvous cts you use sreg->status. MPI_SOURCE as destination (later in MPIDI_IPC_remote_complete) but I'm afraid in 'sending' requests this field</div>
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<div dir="ltr"><div>Hi,</div><div><br></div><div>I think there is a bug in MPIDI_IPC_rndv_cts_cb (ipc_control.c). When you do rendezvous cts you use sreg->status.MPI_SOURCE as destination (later in MPIDI_IPC_remote_complete) but I'm afraid in 'sending' requests this field might not be filled properly.</div><div>As the results mpi crashes if MPIR_CVAR_CH4_IPC_RNDV_PROTOCOL is set to auto (messagie_size>MPIR_CVAR_CH4_IPC_CMA_P2P_THRESHOLD) | coop | rput </div><div>(with number of ranks > 2 ).</div><div><br></div><div>I fixed it locally by propagating correct value to MPI_SOURCE: inserting</div><div> sreq->status.MPI_SOURCE = MPIDIG_REQUEST(sreq, u.send.dest);<br>before<br> MPIDI_IPC_remote_complete(sreq, hdr->ipc_hdr.ipc_type);</div><div></div><div>around ipc_control.c:139, but you can choose a more 'elegant' way to fix this.</div><div><br></div><div></div><div>Cheers, </div><div>Alex</div></div>