mlx5_ib_mcg_attach:3083: failed attaching QPN

Solution Verified - Updated -

Issue

  • Mellanox ConnectX 5 interface in InfiniBand mode reports driver error:
mlx5_core: mlx5_cmd_check:711:(pid XXX): ATTACH_TO_MCG(0x806) op_mod(0x0) failed, status bad resource state(0x9), syndrome (0x42d2bf)
mlx5_1:mlx5_ib_mcg_attach:3083:(pid XXX): failed attaching QPN 0x999, MGID ffff:aaaa:0000:0000:0000:aaaa:eeee:8888

Environment

  • Red Hat Enterprise Linux 7.6 (kernel-3.10.0-957.5.1.el7) and earlier
  • Mellanox ConnectX 5 using mlx5 driver in InfiniBand Mode

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