linux-kernel - Re: 4.14.9 with CONFIG

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Date:   Sat, 30 Dec 2017 02:15:29 +0300
From:   Alexander Tsoy <alexander@...y.me>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Dave Hansen <dave.hansen@...el.com>, Greg KH <greg@...ah.com>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...e.de>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Borislav Petkov <bp@...en8.de>,
        Borislav Petkov <bpetkov@...e.de>,
        Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Laight <David.Laight@...lab.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Eduardo Valentin <eduval@...zon.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rik van Riel <riel@...hat.com>,
        Will Deacon <will.deacon@....com>,
        "Liguori, Anthony" <aliguori@...zon.com>,
        Daniel Gruss <daniel.gruss@...k.tugraz.at>,
        Hugh Dickins <hughd@...gle.com>,
        Kees Cook <keescook@...gle.com>,
        Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>
Subject: Re: 4.14.9 with CONFIG_MCORE2 fails to boot

В Пт, 29/12/2017 в 14:09 -0800, Linus Torvalds пишет:
> 
...
> The fact that double faults seem to be implicated does make me want
> to
> try to disable that ESPFIX64 code in the #DF handler.
> 
> What happens if you take a failing kernel, and then in
> arch/x86/kernel/traps.c do_double_fault(), you change the
> 
>   #ifdef CONFIG_X86_ESPFIX64
> 
> to just a
> 
>   #if 0
> 
> do you then get an actual double-fault oops report instead of the
> stall (and NMI oops)?

This is what I get after disabling ESPFIX64 (see attachment).
View attachment "linux-4.15-rc5+-console.log" of type "text/x-log" (4969 bytes)