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Dear MVAPICH Team, Hello, I would like to report a deadlock issue related to the MV2_USE_BLOCKING in MVAPICH2 version 2. 3. 7. To help reproduce the issue, I have detailed the environment, test method, and the suspected cause and solution below. </div>
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Dear MVAPICH Team,</div>
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Hello, I would like to report a deadlock issue related to the MV2_USE_BLOCKING in MVAPICH2 version 2.3.7.</div>
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To help reproduce the issue, I have detailed the environment, test method, and the suspected cause and solution below.</div>
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[Environment]</div>
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Homogeneous 2-node setup</div>
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Ethernet controller: Mellanox Technologies MT28908 Family [ConnectX-6]</div>
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CPU : AMD Ryzen Threadripper 2950X (16 - Core Processor)</div>
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OS : Kernel 5.15.104, Ubuntu 20.04</div>
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MPI : MVAPICH2-2.3.7 (latest release)</div>
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[Test Method]</div>
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osu-micro-benchmarks-7.5, MPI_IGather() non-blocking benchmark</div>
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32 process(16 process on each node)</div>
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Increased iteration easily reproduces dead-lock issue</div>
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[Reason & Solution]</div>
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Suspected Issue: Re-arming of the completion channel is not handled correctly</div>
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[Source Code]</div>
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Relevant Source File : mpid/ch3/channels/mrail/src/gen2/ibv_channel_manager.c</div>
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Function : static inline int perform_blocking_progress_for_ib(int hca_num, int num_cqs)</div>
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Suggested Fix: <code>ibv_req_notify_cq()</code> should be called after acknowledging the completion events</div>
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You can view a proposed patch here:</div>
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<a class="OWAAutoLink" id="OWA078f8809-3a42-fc13-b7de-9f7adfee03e5" href="https://urldefense.com/v3/__https://www.diffchecker.com/P4kKplpZ/__;!!KGKeukY!0f3xIInYTO4QfxtJvKP57TtDQLukDIQCvHyE1S-0H6SpgsdKdgNadntujhQnugfVUNeyKiu47y9pBfyEwxjsgjLHGkGRATouEg$">https://www.diffchecker.com/P4kKplpZ/</a></div>
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Thank you for your support.</div>
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Best regards,</div>
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purum.</div>
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