group.of.nepali.translators team mailing list archive

[Dimitri John Ledkov <launchpad@xxxxxxxxxxxx>]

** Project changed: ubuntu-power-systems => ubuntu-z-systems

** Changed in: systemd (Ubuntu)
       Status: New => Confirmed

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

** Also affects: systemd (Ubuntu Artful)
   Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
       Status: Confirmed

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

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https://bugs.launchpad.net/bugs/1713536

Title:
  udev: boot script does not trigger subsystem coldplug

Status in Ubuntu on IBM z Systems:
  New
Status in systemd package in Ubuntu:
  Confirmed
Status in systemd source package in Xenial:
  New
Status in systemd source package in Zesty:
  New
Status in systemd source package in Artful:
  Confirmed

Bug description:
  The udev initramfs-tools boot script does not trigger subsystem "add"
  uevents. As a result, udev rules that listen to subsystem "add" events
  are never activated. This problem exists on at least Ubuntu 16.04 and
  17.10.

  On s390, this results in a boot failure if the kernel is configured to
  start with an active device black list (kernel parameter
  cio_ignore=all,!condev). An example for an affected udev rule looks
  like this:

      ACTION=="add", SUBSYSTEM=="subsystem", KERNEL=="ccw",
  RUN{program}+="/bin/sh -c 'echo free 0009,ec30,ec32,f5f0-f5f2 >
  /proc/cio_ignore'"

  A proposed fix would be:

  Modify /usr/share/initramfs-tools/scripts/init-top/udev:

  Replace line
          udevadm trigger --action=add
  with
          udevadm trigger --type=subsystems --action=add
          udevadm trigger --type=devices --action=add

  This would also be consistent with the steps that the systemd udev
  coldplug unit file performs (see /lib/systemd/system/systemd-udev-
  trigger.service).

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