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 15:47:57 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        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
 enabledg

On Fri, Aug 17, 2018 at 03:39:07PM -0700, Andi Kleen wrote:
> On Fri, Aug 17, 2018 at 03:27:33PM -0700, 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.
> 
> Just to confirm, it's not in mainline right? So only in backports?
> 

I have only seen it in v.4.4.y and v4.9.y. v4.14.y does not seem to be
affected.

> There's also a report for 4.17 in
> 
>  https://bugzilla.redhat.com/show_bug.cgi?id=1618792
> 
This is a different traceback, so it is most likely a different
problem.

I did not test v4.17.y. I'll do that (and v4.18.y, and mainline)
for completeness tonight.

Guenter