Offlined CPUs of a core fail to come up online on POWER9 DD1 (Ubuntu 17.04)
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
The Ubuntu-power-systems project |
Fix Released
|
High
|
Unassigned | ||
linux (Ubuntu) |
Fix Released
|
High
|
Unassigned | ||
Zesty |
Fix Released
|
High
|
Unassigned |
Bug Description
== Comment: #0 - Ranjal G. Shenoy <email address hidden> - 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/
3) powerpc/linux.git, commit f3b3f28493d932 ("powerpc/
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-
== Comment: #1 - Ranjal G. Shenoy <email address hidden> - 2017-04-20 08:29:54 ==
== Comment: #2 - Ranjal G. Shenoy <email address hidden> - 2017-04-20 08:30:37 ==
== Comment: #3 - Ranjal G. Shenoy <email address hidden> - 2017-04-20 08:31:15 ==
CVE References
tags: | added: kernel-da-key |
Changed in linux (Ubuntu): | |
assignee: | Taco Screen team (taco-screen-team) → Canonical Kernel Team (canonical-kernel-team) |
Changed in linux (Ubuntu): | |
importance: | Undecided → High |
Changed in linux (Ubuntu): | |
status: | New → In Progress |
assignee: | Canonical Kernel Team (canonical-kernel-team) → Joseph Salisbury (jsalisbury) |
Changed in linux (Ubuntu Zesty): | |
status: | New → In Progress |
importance: | Undecided → High |
assignee: | nobody → Joseph Salisbury (jsalisbury) |
Changed in linux (Ubuntu): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu Zesty): | |
status: | In Progress → Fix Committed |
tags: | added: ubuntu-17.04 |
Changed in linux (Ubuntu): | |
status: | Fix Committed → Fix Released |
Changed in ubuntu-power-systems: | |
importance: | Undecided → High |
status: | New → Fix Released |
tags: | added: cscc |
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