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Date:   Mon, 24 Aug 2020 12:06:45 +0100
From:   Matthew Wilcox <willy@infradead.org>
To:     Naresh Kamboju <naresh.kamboju@linaro.org>
Cc:     linux-mm <linux-mm@kvack.org>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
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Subject: Re: BUG: Bad page state in process true  pfn:a8fed on arm
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On Mon, Aug 24, 2020 at 03:14:55PM +0530, Naresh Kamboju wrote:
> [   67.545247] BUG: Bad page state in process true  pfn:a8fed
> [   67.550767] page:9640c0ab refcount:0 mapcount:-1024

Somebody freed a page table without calling __ClearPageTable() on it.