** Changed in: linux (Ubuntu Xenial)
Status: New => In Progress
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu Focal)
Status: New => In Progress
** Changed in: linux (Ubuntu Groovy)
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) =>
Canonical Kernel Team (canonical-kernel-team)
** Changed in: linux (Ubuntu Focal)
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
** Changed in: linux (Ubuntu Groovy)
Assignee: Canonical Kernel Team (canonical-kernel-team) => (unassigned)
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
** Changed in: linux (Ubuntu Xenial)
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
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https://bugs.launchpad.net/bugs/1893897
Title:
[Regression] Do not initiate shutdown for EPOW_SHUTDOWN_ON_UPS event
Status in The Ubuntu-power-systems project:
In Progress
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
In Progress
Status in linux source package in Bionic:
In Progress
Status in linux source package in Focal:
In Progress
Status in linux source package in Groovy:
Fix Released
Bug description:
SRU Justification:
[Impact]
* With commit 79872e35469b "powerpc/pseries: All events of
EPOW_SYSTEM_SHUTDOWN must initiate shutdown" it was introduced that
all EPOW_SYSTEM_SHUTDOWN events cause immediate shutdowns.
* But on LPARs there is a user space tool (rtas_errd) that monitor for
EPOW_SHUTDOWN_ON_UPS events.
* Once rtas_errd gets an event it initiates a shutdown after
predefined time.
* Therefore immediate shutdowns must not be triggered if the system is
running on UPS (means for EPOW_SHUTDOWN_ON_UPS events).
[Fix]
* 90a9b102eddf6a3f987d15f4454e26a2532c1c98 90a9b102eddf
"powerpc/pseries: Do not initiate shutdown when system is running on
UPS"
[Test Case]
* Setup a Power system on (D)LPAR and run it on UPS with Ubuntu 16.04
or higher (kernel 4.x is needed).
* Verify that the user space tool (rtas_errd) is active and running.
* Define a time for a potential shutdown in case an
EPOW_SHUTDOWN_ON_UPS event occurs.
* Trigger an EPOW_SHUTDOWN_ON_UPS event.
* Verify if the system got shutdown immediately - or after the pre-
defined time.
[Regression Potential]
* The regression risk is very low, because of the very limited
modification in a case statement for EPOW_SHUTDOWN_ON_UPS events.
* What may happen is that the system doesn't power off anymore if
running on UPS due to the EPOW_SHUTDOWN_ON_UPS case changes -
especially if there is a potential problem with rtas_errd that should
monitor for these events and should initiate the delayed shutdown.
* Other than that I cannot see much potential harm.
[Other]
* The patch got upstream accepted in v5.9-rc2 and already landed in
groovy's kernel 'Ubuntu-5.8.0-18.19', based on the v5.8.4 upstream
stable release ticket LP 1893048.
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