RHEL7.5: hangs at boot with Cisco usnic Infiniband

Solution In Progress - Updated -

Issue

  • After an update from RHEL 7.4 to RHEL 7.5 the Network Manager is refusing to start.
  • System intermittently hangs after boot when the usnic_verbs is loaded.
  • The key part is "intel_iommu=on" in kernel cmdline.

Environment

  • Red Hat Enterprise Linux
    • kernel 3.10.0-862.3.2.el7.x86_64

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