*** This bug is a duplicate of bug 1709171 ***
https://bugs.launchpad.net/bugs/1709171
------- Comment From [email protected] 2017-10-03 17:15 EDT-------
(In reply to comment #14)
> > bug 1709171 now disables CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE, so this bug
> > may be a duplicate of that?
>
> Yes, this bug is now a duplicate of 1709171.
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.
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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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