** Changed in: ubuntu
Status: New => Confirmed
** Package changed: ubuntu => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Taco Screen team (taco-screen-team)
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https://bugs.launchpad.net/bugs/1442878
Title:
Backport upstream bugfix in cpuidle to fix memory corruption
Status in linux package in Ubuntu:
Confirmed
Bug description:
== Comment: #0 - Shilpasri G. Bhat <[email protected]> - 2015-04-10
14:35:43 ==
This is a request to backport upstream cpuidle bugfix for a memory corruption
d52356e7f48e powerpc: fix memory corruption by pnv_alloc_idle_core_states
Space allocated for paca is based off nr_cpu_ids, but
pnv_alloc_idle_core_states()
iterates paca with cpu_nr_cores()*threads_per_core, which is using NR_CPUS.
This causes pnv_alloc_idle_core_states() to write over memory, which is
outside
of paca array and may later lead to various panics.
Fixes: 7cba160ad789 (powernv/cpuidle: Redesign idle states management)
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