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Date:   Fri, 17 Aug 2018 19:46:31 -0700
From:   Andi Kleen <ak@linux.intel.com>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Guenter Roeck <linux@roeck-us.net>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
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        Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: Crash in MM code in v4.4.y, v4.9.y with TRANSPARENT_HUGEPAGE
 enabled
Message-ID: <20180818024631.GJ12066@tassilo.jf.intel.com>
References: <20180817222733.GA18575@roeck-us.net>
 <CA+55aFw6KDEts1bk7F-HYVn_dSuFQHZZh89Ydqh1rFn-c5V+eQ@mail.gmail.com>
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> Plus I'd have expected the problem to have been in mainline too, and
> apparently it's just the 4.4 and 4.9 backports.

There's another problem in 4.17, but not 4.18, see 
https://bugzilla.redhat.com/show_bug.cgi?id=1618792

Could be the same or different.

-Andi

> 
> Your test-case does have mprotect with PROT_NONE. Which together with
> that mask that *might* be PHYSICAL_PMD_PAGE_MASK makes me think it
> might be related.
> 
>              Linus