[Bug 1807077] Re: mountall crashes on udev node with missing devname

[Ryan Finnie]

** Patch added: "lp1807077-trusty.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/mountall/+bug/1807077/+attachment/5219619/+files/lp1807077-trusty.debdiff

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Title:
  mountall crashes on udev node with missing devname

Status in mountall package in Ubuntu:
  New

Bug description:
  Running bionic's 4.15 kernel on trusty on an HPE DL385 Gen10 results
  in a device node for the NVMe controller,
  /devices/pci0000:40/0000:40:03.1/0000:43:00.0/nvme/nvme0/nvme0c33n1
  which itself does not have a devname.  When mountall gets to it:

  fsck_update: updating check priorities
  try_mount: /srv/nova/instances waiting for device
  try_udev_device: ignored /dev/loop5 (not yet ready?)
  try_udev_device: ignored /dev/loop6 (not yet ready?)
  try_udev_device: ignored /dev/loop1 (not yet ready?)
  try_udev_device: ignored /dev/loop0 (not yet ready?)
  try_udev_device: block (null) (null) (null)

  and then crashes, leaving the boot at an emergency root shell.  A
  successful scan looks like this for comparison:

  try_udev_device: block /dev/sdb (null) (null)
  try_udev_device: block /dev/sdb (null) (null)
  try_udev_device: block /dev/sda (null) (null)
  try_udev_device: block /dev/nvme0n1 ed56e3a9-60f7-4636-85a2-b53137b598e7 (null)
  try_udev_device: block /dev/bcache0 756cb2c6-b999-4905-a021-c2e688e81a86 instances

  The (forthcoming) debdiffs check for a null devname in
  try_udev_device() and will not attempt to process it.

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