linux-kernel - Re: [PATCH v1] mm/memory_hotplug: Don't free usage map when removing a re-added early section

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Date:   Wed, 8 Jan 2020 17:11:28 +0800
From:   Pingfan Liu <kernelfans@...il.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Dan Williams <dan.j.williams@...el.com>,
        Oscar Salvador <osalvador@...e.de>,
        Michal Hocko <mhocko@...nel.org>,
        Pingfan Liu <piliu@...hat.com>
Subject: Re: [PATCH v1] mm/memory_hotplug: Don't free usage map when removing
 a re-added early section

On Wed, Jan 8, 2020 at 4:24 PM David Hildenbrand <david@...hat.com> wrote:
>
>
> We have another reproducer that is used more frequently than memtrace :)
>
> Using Dynamic Memory under a Power DLAPR can trigger it easily.
> Triggering removal (I assume after previously removed+re-added) of
> memory from the HMC GUI can crash the kernel with the same call trace
> and is fixed by this patch.
>
> CCing Pingfan who verified that this patch fixes the issue - maybe he
> wants to provide a Tested-by:
Yes, this patch fixes the hot remove+add+remove bug on POWERVM, which
can be reproduced by dlpar.

Tested-by: Pingfan Liu <piliu@...hat.com>
>
> @Andrew, any chance we can get this upstream soon-ish? Thanks!
>
> --
> Thanks,
>
> David / dhildenb
>