*** This bug is a duplicate of bug 1709171 ***
https://bugs.launchpad.net/bugs/1709171
------- Comment From [email protected] 2017-10-04 10:10 EDT-------
(In reply to comment #16)
> Hi Nathan,
>
> > I wouldn't consider this a duplicate of 1709171. The patch referred to in
> > this bz is a more complete fix than just disabling the auto onlining of
> > memory.
> >
> > The key thing to note is that even if we disable auto onlining by default,
> > a user can still enable this behavior through sysfs. If a user were to do
> > that with the patch mentioned in this bug we would see the same behavior
> > this bug was opened for.
> >
> > The patch referenced here makes a check to see if the memory is already
> > online or offline before onling or offlining it.
>
> I said that this is a duplicate of 1709171 because 1709171 reports and fixes
> this issue, although I agree with you that a proper fix would be to fix the
> auto onlining behavior instead of disabling it.
>
> Unfortunately, it appears that your fix
> (1a367063ca0c1c6f6f54b5abd7b4836b0866a07b) didn't make it to 4.13 so the
> distros would need to backport it to allow the auto online to be enabled
> without breaking LMB unplug in pseries. So, unless the distros are willing
> to do this backport, disabling the option will have to suffice until 4.14.
> Users will have to refrain from echoing sysfs to re-enable mem auto-online
> until then.
I think that will be acceptable. I don't see auto onlining as a feature
that many know about or use.
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https://bugs.launchpad.net/bugs/1710922
Title:
Ubuntu 17.10 ppc64el guest with MEMORY_HOTPLUG_DEFAULT_ONLINE=y gets a
"kernel BUG at mm/memory_hotplug.c:2185" when hotplugging LMBs with
QEMU upstream
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