Public bug reported:
[Impact]
The numa mask subset check can often lead to system hang or crash during CPU
hotplug and system suspend operation if NUMA is disabled. This is mostly
observed on HMP systems where the CPU compute capacities are different and ends
up in different scheduler domains. Since cpumask_of_node is returned instead
core_sibling, the scheduler is confused with incorrect cpumasks(e.g. one CPU in
two different sched domains at the same time) on CPU hotplug.
[Fix]
The following patch fixes this issue:
e156ab71a974 arm64: topology: Avoid checking numa mask for scheduler MC
selection
[Test]
[Regression Potential]
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: cavium
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https://bugs.launchpad.net/bugs/1797202
Title:
[Bionic] arm64: topology: Avoid checking numa mask for scheduler MC
selection
Status in linux package in Ubuntu:
New
Bug description:
[Impact]
The numa mask subset check can often lead to system hang or crash during CPU
hotplug and system suspend operation if NUMA is disabled. This is mostly
observed on HMP systems where the CPU compute capacities are different and ends
up in different scheduler domains. Since cpumask_of_node is returned instead
core_sibling, the scheduler is confused with incorrect cpumasks(e.g. one CPU in
two different sched domains at the same time) on CPU hotplug.
[Fix]
The following patch fixes this issue:
e156ab71a974 arm64: topology: Avoid checking numa mask for scheduler MC
selection
[Test]
[Regression Potential]
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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797202/+subscriptions
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