[Bug 1906653] Re: Backport systemd to make uevents "sticky"

[Dan Streetman]

I'm hesitant to backport, because the change causes significant issues on upgrade, e.g.:
https://github.com/systemd/systemd/issues/17605

if we do backport the 'sticky' udev tags, we'll need to make sure to also pull back the proper commits to handle the new udev format across daemon-reexec, e.g.:
https://github.com/systemd/systemd/pull/17622

** Bug watch added: github.com/systemd/systemd/issues #17605
   https://github.com/systemd/systemd/issues/17605

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Title:
  Backport systemd to make uevents "sticky"

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Base on lwn 837033 [0], Linux 4.12 introduced two new uevents "bind"
  and "unbind" to the Linux device model which resulted in a number of
  software issues.

  So in this PR [1] which minimize issues resulting from this kernel
  change (but not avoid them entirely) by make uevent "sticky", meaning
  that once a tag is assigned to a device it will not be removed from
  the device again until the device itself is removed (i.e. unplugged).

  An example causing by this issue, I had a usb printer (non-ippusbxd)
  which connected to my laptop, but after unplugging it from my laptop,
  the .device unit were still present, if a different printer gets
  plugged to the same USB port then, it won't be configured correctly.

  [0] https://lwn.net/Articles/837033/
  [1] https://github.com/systemd/systemd/pull/16853/files

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