linux-kernel - Re: Splat during resume

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Message-ID: <20170325214615.eqgmkwbkyldt7wwl@pd.tnic>
Date:   Sat, 25 Mar 2017 22:46:15 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        x86-ml <x86@...nel.org>
Subject: Re: Splat during resume

On Sat, Mar 25, 2017 at 07:58:55PM +0100, Borislav Petkov wrote:
> Hey Rafael,
> 
> have you seen this already (partial splat photo attached)? Happens
> during resume from s2d. Judging by the timestamps, this looks like the
> resume kernel before we switch to the original, boot one but I could be
> mistaken.
> 
> This is -rc3+tip/master.
> 
> I can't catch a full splat because this is a laptop and it doesn't have
> serial. netconsole is helping me for shit so we'd need some guess work.
> 
> So I'm open to suggestions.
> 
> Please don't say "bisect" yet ;-)))

No need, I found it. Reverting

  ea3b5e60ce80 ("x86/mm/ident_map: Add 5-level paging support")

makes the machine suspend and resume just fine again. Lemme add people to CC.

-- 
Regards/Gruss,
    Boris.

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