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

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Message-ID: <20200824110645.GC17456@casper.infradead.org>
Date:   Mon, 24 Aug 2020 12:06:45 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     linux-mm <linux-mm@...ck.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        LTP List <ltp@...ts.linux.it>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@....de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Xu <peterx@...hat.com>, opendmb@...il.com,
        Linus Walleij <linus.walleij@...aro.org>,
        afzal.mohd.ma@...il.com, Will Deacon <will@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: BUG: Bad page state in process true  pfn:a8fed on arm

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.