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

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Message-ID: <20180820162938.GR29735@dhcp22.suse.cz>
Date:   Mon, 20 Aug 2018 18:29:38 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>,
        David Woodhouse <dwmw@...zon.co.uk>, x86@...nel.org,
        dvyukov@...gle.com, 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

On Fri 17-08-18 15:27:33, Guenter Roeck wrote:
> Hi,
> 
> the following crash is seen in v4.4.148, v4.4.149, v4.9.120, and v4.9.121
> with CONFIG_TRANSPARENT_HUGEPAGE=y, CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y.

Could you try to apply fd7e315988b7 ("x86/mm: Simplify p[g4um]d_page()
macros"). I do not see it in stable 4.4 tree and it has been introduced
much later in 4.14. This one gave us quite some headache because it is
soooo easy to overlook.
-- 
Michal Hocko
SUSE Labs