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Re: [PATCH v2 0/4] x86: sigcontext fixes, again

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On Wed, 2015-10-28 at 07:37 +0900, Linus Torvalds wrote:
> On Tue, Oct 27, 2015 at 11:05 PM, Stas Sergeev <stsp@list.ru> wrote:
> > 
> > I can't easily post an Oops: under X it doesn't even appear -
> > machine freezes immediately, and under non-KMS console it is
> > possible to get one, but difficult to screen-shot (using bare
> > metal, not VM). Also the Oops was seemingly unrelated.
> > And if you run "dosemu -s" under non-KMS console, you'll also
> > reproduce this one:
> > https://bugzilla.kernel.org/show_bug.cgi?id=97321
> 
> Hmm. Andrew Morton responded to that initially, but then nothing
> happened, and now it's been another six months. Andrew?
> 
> The arch/x86/mm/pat.c error handling does seem to be suspect. This is
> all code several years old, so none of this is new, and I think Suresh
> is gone.  Adding a few other people with recent sign-offs to that
> file, in the hope that somebody feels like they own it..

In the case of PFNMAP, the range should always be mapped.  So, I wonder why
follow_phys() failed with the !pte_present() check.

Stas, do you have a test program that can reproduce 97321?

-Toshi
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[PATCH v2 0/4] x86: sigcontext fixes, again Andy Lutomirski <luto@kernel.org> - 2015-10-26 02:30 +0100
  [PATCH v2 2/4] x86/signal/64: Fix SS if needed when delivering a 64-bit signal Andy Lutomirski <luto@kernel.org> - 2015-10-26 02:30 +0100
  [PATCH v2 1/4] x86/signal/64: Add a comment about sigcontext->fs and gs Andy Lutomirski <luto@kernel.org> - 2015-10-26 02:30 +0100
  [PATCH v2 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context Andy Lutomirski <luto@kernel.org> - 2015-10-26 02:30 +0100
  [PATCH v2 4/4] selftests/x86: Add tests for UC_SIGCONTEXT_SS and UC_STRICT_RESTORE_SS Andy Lutomirski <luto@kernel.org> - 2015-10-26 02:30 +0100
  Re: [PATCH v2 0/4] x86: sigcontext fixes, again Stas Sergeev <stsp@list.ru> - 2015-10-26 12:50 +0100
    Re: [PATCH v2 0/4] x86: sigcontext fixes, again Andy Lutomirski <luto@amacapital.net> - 2015-10-27 02:00 +0100
      Re: [PATCH v2 0/4] x86: sigcontext fixes, again Linus Torvalds <torvalds@linux-foundation.org> - 2015-10-27 23:40 +0100
        Re: [PATCH v2 0/4] x86: sigcontext fixes, again Toshi Kani <toshi.kani@hpe.com> - 2015-10-28 01:10 +0100
          Re: [PATCH v2 0/4] x86: sigcontext fixes, again Stas Sergeev <stsp@list.ru> - 2015-10-28 11:00 +0100
            Re: [PATCH v2 0/4] x86: sigcontext fixes, again Toshi Kani <toshi.kani@hpe.com> - 2015-10-28 17:40 +0100
              Re: [PATCH v2 0/4] x86: sigcontext fixes, again Toshi Kani <toshi.kani@hpe.com> - 2015-10-28 20:30 +0100
                Re: [PATCH v2 0/4] x86: sigcontext fixes, again Toshi Kani <toshi.kani@hpe.com> - 2015-10-29 00:00 +0100
                Re: [PATCH v2 0/4] x86: sigcontext fixes, again Stas Sergeev <stsp@list.ru> - 2015-10-31 13:50 +0100
      Re: [PATCH v2 0/4] x86: sigcontext fixes, again Andy Lutomirski <luto@amacapital.net> - 2015-10-31 01:00 +0100

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