linux-kernel - Re: [lkp-robot] [x86/asm] f5caf621ee: PANIC:double

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Message-ID: <20170928114952.7m7zr4zr6i5d56ko@hirez.programming.kicks-ass.net>
Date:   Thu, 28 Sep 2017 13:49:52 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     kernel test robot <xiaolong.ye@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Alexander Potapenko <glider@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Dmitriy Vyukov <dvyukov@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Miguel Bernal Marin <miguel.bernal.marin@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [lkp-robot] [x86/asm]  f5caf621ee: PANIC:double_fault

On Thu, Sep 28, 2017 at 10:49:41AM +0200, Ingo Molnar wrote:
> > Sure, but its still an officially supported GCC version. So either it
> > must be made to work, or we must update the minimal GCC version
> > requirements for the kernel.
> 
> Of course! I just mean I'd not be surprised if this was a GCC bug/quirk
> with legacy GCC versions that probably won't be fixed.

Ah, I recently had a case where this old GCC-4.4 crashed on 'obviously'
broken code while newer GCC's somehow made it 'work'.