Re: [PATCH for 4.19-stable 00/25] mm/memory_hotplug: backport of pending stable fixes

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On 16.01.20 09:34, Greg Kroah-Hartman wrote:
> On Wed, Jan 15, 2020 at 04:54:59PM +0100, David Hildenbrand wrote:
>>>
>>> And why would 4.9 and 4.4 care about them?
>>
>> The crashes can be trigger under 4.9 and 4.4. If we decide that we do
>> not care, then this series can be dropped.
> 
> Do we have users of memory hotplug that are somehow stuck at those old
> versions that can not upgrade?  Obviously this didn't work previously
> for them, so moving to a modern kernel might be a good reason to get
> this new feature :)

That's a good point - but usually when you experience a crash it's too
late for you to realize that you have to move to a newer release :) It
used to work before 4.4 IIRC.

(one case I am concerned with is when memory onlining after memory
hotplug failed (e.g., because the was an OOM event happening
concurrently) - then memory hotunplug will crash your system.)

But yeah, I am not aware of a report where somebody actually hit any of
these issues on a stable kernel.

-- 
Thanks,

David / dhildenb





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