panic on shutdown in netlink_broadcast_filtered() when using namespaces for Infiniband

Solution In Progress - Updated -

Issue

  • A device_shutdown() on Infiniband device panics with null pointer

    mlx5_core 0000:03:00.1: Shutdown was called
ib_srpt received unrecognized IB event 8
mlx5_core 0000:03:00.0: Shutdown was called
mlx5_core 0000:03:00.0: mlx5_cmd_fast_teardown_hca:338:(pid 5188): teardown with fast mode failed
mlx5_core 0000:03:00.0: mlx5_cmd_force_teardown_hca:307:(pid 5188): teardown with force mode failed, doing normal teardown
BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
CPU: 7 PID: 5188 Comm: reboot Kdump: loaded Tainted: G        W        --------- -  - 4.18.0-305.el8.x86_64 #1
RIP: 0010:netlink_broadcast_filtered+0x22/0x400

  • panic on shutdown in netlink_broadcast_filtered() when using namespaces for Infiniband

Environment

  • Red Hat Enterprise Linux (RHEL) 8.4
    • network namespace usage
    • Mellanox ConnectX-4 (mlx5_core driver)
      • This is card/driver reported on, could impact more.

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