linux-kernel - Re: Crash in MM code in v4.4.y, v4.9.y with TRANSPARENT

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Date:   Fri, 17 Aug 2018 19:46:31 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        the arch/x86 maintainers <x86@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Hugh Dickins <hughd@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: Crash in MM code in v4.4.y, v4.9.y with TRANSPARENT_HUGEPAGE
 enabled

> 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