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

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Date:   Thu, 28 Sep 2017 09:59:07 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     kernel test robot <xiaolong.ye@...el.com>
Cc:     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>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [lkp-robot] [x86/asm]  f5caf621ee: PANIC:double_fault


* kernel test robot <xiaolong.ye@...el.com> wrote:

> 
> FYI, we noticed the following commit:
> 
> commit: f5caf621ee357279e759c0911daf6d55c7d36f03 ("x86/asm: Fix inline asm call constraints for Clang")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> 
> in testcase: trinity
> with following parameters:
> 
> 	runtime: 300s
> 
> test-description: Trinity is a linux system call fuzz tester.
> test-url: http://codemonkey.org.uk/projects/trinity/
> 
> 
> on test machine: qemu-system-x86_64 -enable-kvm -m 420M
> 
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> 
> 
> +-----------------------------------------+------------+------------+
> |                                         | 0d0970eef3 | f5caf621ee |
> +-----------------------------------------+------------+------------+
> | boot_successes                          | 9          | 4          |
> | boot_failures                           | 0          | 4          |
> | PANIC:double_fault                      | 0          | 4          |
> | Kernel_panic-not_syncing:Machine_halted | 0          | 4          |
> +-----------------------------------------+------------+------------+

I think a key piece of information is that the test is using GCC 4.4:

        export compiler='gcc-4.4'

... which is pretty old compared to what gets tested typically.

GCC 4.4 was released in 2009 (!), the last minor update of 4.4.7 was 5 years ago.

Thanks,

	Ingo