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Re: Splat during resume

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On Sat, Mar 25, 2017 at 10:46:15PM +0100, Borislav Petkov wrote:
> 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.

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.

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Re: Splat during resume Borislav Petkov <bp@alien8.de> - 2017-03-25 22:50 +0100
  Re: Splat during resume Borislav Petkov <bp@alien8.de> - 2017-03-25 23:00 +0100
    Re: Splat during resume Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-25 23:10 +0100
      Re: Splat during resume Borislav Petkov <bp@alien8.de> - 2017-03-25 23:50 +0100
    Re: Splat during resume "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-03-25 23:20 +0100
  Re: Splat during resume Mike Galbraith <efault@gmx.de> - 2017-03-26 10:30 +0200
    Re: Splat during resume Borislav Petkov <bp@alien8.de> - 2017-03-26 10:50 +0200
      Re: Splat during resume Mike Galbraith <efault@gmx.de> - 2017-03-26 12:20 +0200

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