** Also affects: ubuntu-power-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-power-systems
Importance: Undecided => Medium
** Changed in: ubuntu-power-systems
Assignee: (unassigned) => Canonical Foundations Team
(canonical-foundations)
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https://bugs.launchpad.net/bugs/1713536
Title:
udev: boot script does not trigger subsystem coldplug
Status in The Ubuntu-power-systems project:
New
Status in systemd package in Ubuntu:
New
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).
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-systems/+bug/1713536/+subscriptions
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