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From: Zhan Chen <zhanc1@andrew.cmu.edu>
Date: Tue, 12 Jul 2016 17:30:34 -0700
Message-ID: <CAAs6xrw+UDeBJE1WKG9FK-YFN6xLDbA_c=_-y857fsRcO9K=Zw@mail.gmail.com>
Subject: 3.10 kernel issue: dequeue_hwpoisoned_huge_page fails in soft offline
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Hi Andi,

I encounter an issue with 3.10 kernel where soft offlined huge page can not
be dequeued. Specifically, in function soft_offline_huge_page,
 dequeue_hwpoisoned_huge_page returns negative. It turns out that right
after the page is put_page, it's grabbed by some thread again.

Is there a fix that can prevent offlined pages being put back in use?
Plus, from the comment, dequeue_hwpoisoned_huge_page assumes caller holding
the page lock, which is not the case in this context, would this be a
problem in this case ?
Thank you.
-Zhan

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<div dir=3D"ltr"><div>Hi Andi,</div><div><br></div><div>I encounter an issu=
e with 3.10 kernel where soft offlined huge page can not be dequeued. Speci=
fically, in function soft_offline_huge_page, =C2=A0dequeue_hwpoisoned_huge_=
page returns negative. It turns out that right after the page is put_page, =
it&#39;s grabbed by some thread again.</div><div><br></div><div>Is there a =
fix that can prevent offlined pages being put back in use?</div><div>Plus, =
from the comment, dequeue_hwpoisoned_huge_page assumes caller holding the p=
age lock, which is not the case in this context, would this be a problem in=
 this case ?</div><div>Thank you.</div><div>-Zhan=C2=A0</div></div>

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