Re: BUG: Bad page state in process true pfn:a8fed on arm

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To: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>
Subject: Re: BUG: Bad page state in process true pfn:a8fed on arm
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Date: Mon, 24 Aug 2020 12:06:45 +0100
Cc: linux-mm <linux-mm@xxxxxxxxx>, Linux-Next Mailing List <linux-next@xxxxxxxxxxxxxxx>, open list <linux-kernel@xxxxxxxxxxxxxxx>, lkft-triage@xxxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, LTP List <ltp@xxxxxxxxxxxxxx>, Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxx>, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, opendmb@xxxxxxxxx, Linus Walleij <linus.walleij@xxxxxxxxxx>, afzal.mohd.ma@xxxxxxxxx, Will Deacon <will@xxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
In-reply-to: <CA+G9fYt=oYWHEG6VNkfEh8+UxbReS6_+9hnz+1bOYZHj5j1F_Q@mail.gmail.com>
References: <CA+G9fYt=oYWHEG6VNkfEh8+UxbReS6_+9hnz+1bOYZHj5j1F_Q@mail.gmail.com>

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.

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- BUG: Bad page state in process true pfn:a8fed on arm
  - From: Naresh Kamboju

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