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

[Dan Streetman]

for reference, the PR linked in the description is included upstream in
v247 so this is fixed in h, i'll mark the bug as such

** Also affects: systemd (Ubuntu Hirsute)
   Importance: Undecided
       Status: Confirmed

** Also affects: systemd (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: systemd (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Changed in: systemd (Ubuntu Hirsute)
       Status: Confirmed => Fix Released

** Changed in: systemd (Ubuntu Groovy)
       Status: New => Won't Fix

** Changed in: systemd (Ubuntu Focal)
       Status: New => Won't Fix

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Title:
  Backport systemd to make uevents "sticky"

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Focal:
  Won't Fix
Status in systemd source package in Groovy:
  Won't Fix
Status in systemd source package in Hirsute:
  Fix Released

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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