linux-kernel - Re: Splat during resume

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Date:   Sat, 25 Mar 2017 15:05:41 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        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>,
        Michal Hocko <mhocko@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, x86-ml <x86@...nel.org>
Subject: Re: Splat during resume

I think this is the same as the kexec issue that also hit -tip.

It's *probably* fixed by the final series to actually enable 5-level
paging (which I don't think is in -tip yet), but even if that is the
case this is obviously a nasty bisectability problem.

You migth want to verify, though. The second batch starts here:

  https://marc.info/?l=linux-mm&m=148977696117208&w=2

Hmm?

In the meantime, this is currently -tip only, so I will stack back
from this thread unless you can reproduce it in mainline too.

               Linus

On Sat, Mar 25, 2017 at 2:50 PM, Borislav Petkov <bp@...en8.de> wrote:
>
> So I see rIP pointing to ident_pmd_init() and the stack trace has
> load_image_and_restore() so if I try to connect the dots, I get:
>
> load_image_and_restore
> |-> hibernation_restore
>  |-> resume_target_kernel
>   |-> swsusp_arch_resume
>    |-> set_up_temporary_mappings
>     |-> kernel_ident_mapping_init
>      |-> ... ident_pmd_init
>
> I'll let you folks make sense of what's going on.
>
> Thanks.
>
> --
> Regards/Gruss,
>     Boris.
>
> Good mailing practices for 400: avoid top-posting and trim the reply.