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Date: Thu, 28 Sep 2017 09:59:07 +0200
From: Ingo Molnar <mingo@kernel.org>
To: kernel test robot <xiaolong.ye@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Matthias Kaehlcke <mka@chromium.org>,
        Alexander Potapenko <glider@google.com>,
        Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
        Dmitriy Vyukov <dvyukov@google.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        LKML <linux-kernel@vger.kernel.org>, lkp@01.org
Subject: Re: [lkp-robot] [x86/asm]  f5caf621ee: PANIC:double_fault
Message-ID: <20170928075907.bpxlop6bq4bn54sk@gmail.com>
References: <20170928074758.GS17200@yexl-desktop>
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* kernel test robot <xiaolong.ye@intel.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

From mboxrd@z Thu Jan  1 00:00:00 1970
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From: Ingo Molnar <mingo@kernel.org>
To: lkp@lists.01.org
Subject: Re: [lkp-robot] [x86/asm] f5caf621ee: PANIC:double_fault
Date: Thu, 28 Sep 2017 09:59:07 +0200
Message-ID: <20170928075907.bpxlop6bq4bn54sk@gmail.com>
In-Reply-To: <20170928074758.GS17200@yexl-desktop>
List-Id: <oe-lkp.lists.linux.dev>

--===============1126962325572135946==
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* kernel test robot <xiaolong.ye@intel.com> wrote:

> =

> FYI, we noticed the following commit:
> =

> commit: f5caf621ee357279e759c0911daf6d55c7d36f03 ("x86/asm: Fix inline as=
m 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=3D'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 year=
s ago.

Thanks,

	Ingo

--===============1126962325572135946==--