[Bug 2002445] Re: udev NIC renaming race with mlx5_core driver

[Lukas Märdian]

Fixed upstream in https://github.com/systemd/systemd/pull/25221

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Title:
  udev NIC renaming race with mlx5_core driver

Status in systemd package in Ubuntu:
  New
Status in systemd source package in Focal:
  Triaged
Status in systemd source package in Jammy:
  Triaged
Status in systemd source package in Kinetic:
  New
Status in systemd source package in Lunar:
  New

Bug description:
  [Impact]
  On systems with mellanox NICs, udev's NIC renaming races with the mlx5_core driver's own configuration of subordinate interfaces. When the kernel wins this race, the device cannot be renamed as udev has attempted, and this causes systemd-network-online.target to timeout waiting for links to be configured. This ultimately results in boot being delayed by about 2 minutes.

  [Test Plan]
  Since this is a race condition, we need to boot many instances before we see the issue. The Ubuntu Server team will help coordinate the testing at scale to confirm the fix.

  [Where problems could occur]
  The patches effectively make it so that if a interface cannot be renamed from udev, then the new name is left as an alternative name as a fallback. If problems occur, it would be related to device renaming, and particularly related to the devices alternative names.

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