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== Comment: #0 - Ranjal G. Shenoy <[email protected]> - 2017-04-20 08:29:13 ==
Power9 DD1 has a hardware issue due to which in core whose all threads are
offlined , when any of the CPUs are onlined, they come online with an incorrect
PACA thereby resulting in a crash.
The following fixes sent upstream need to applied to the 17.04 kernel to
get CPU-Hotplug working correctly on a Power9 DD1 system.
1) powerpc/linux.git next, commit a7cd88da9704 ("powernv: Move CPU-
Offline idle state invocation from smp.c to idle.c").
2) powerpc/linux.git next, the commit 900612315788
("powerpc/powernv/smp: Add busy-wait loop as fall back for CPU-
Hotplug").
3) powerpc/linux.git, commit f3b3f28493d932 ("powerpc/powernv/idle:
Don't override default/deepest directly in kernel").
4) powerpc/linux.git next, commit 17ed4c8f81da ("powerpc/powernv:
Recover correct PACA on wakeup from a stop on P9 DD1").
These patches have been backported onto the 17.04 Kernel tagged
Ubuntu-4.10.0-19.21.
== Comment: #1 - Ranjal G. Shenoy <[email protected]> - 2017-04-20
08:29:54 ==
== Comment: #2 - Ranjal G. Shenoy <[email protected]> - 2017-04-20 08:30:37 ==
== Comment: #3 - Ranjal G. Shenoy <[email protected]> - 2017-04-20 08:31:15 ==
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Taco Screen team (taco-screen-team)
Status: New
** Tags: architecture-ppc64le bugnameltc-153589 severity-high
targetmilestone-inin1704
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Offlined CPUs of a core fail to come up online on POWER9 DD1 (Ubuntu 17.04)
https://bugs.launchpad.net/bugs/1685792
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