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From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: kernel test robot <xiaolong.ye@intel.com>,
	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>,
	Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>,
	lkp@01.org
Subject: Re: [lkp-robot] [x86/asm]  f5caf621ee: PANIC:double_fault
Date: Thu, 28 Sep 2017 10:18:50 +0200
Message-ID: <20170928081850.ep3nqulhxeakwmzs@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20170928075907.bpxlop6bq4bn54sk@gmail.com>

On Thu, Sep 28, 2017 at 09:59:07AM +0200, Ingo Molnar wrote:
> 
> * 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.

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.

  reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-28  7:47 kernel test robot
2017-09-28  7:59 ` Ingo Molnar
2017-09-28  8:18   ` Peter Zijlstra [this message]
2017-09-28  8:49     ` Ingo Molnar
2017-09-28 11:49       ` Peter Zijlstra
2017-09-28 16:21 ` Linus Torvalds
2017-09-28 16:44   ` Josh Poimboeuf
2017-09-28 17:01     ` Josh Poimboeuf
2017-09-28 19:10       ` Josh Poimboeuf
2017-09-28 21:58         ` [PATCH] x86/asm: Fix inline asm call constraints for GCC 4.4 Josh Poimboeuf
2017-09-28 23:53           ` Linus Torvalds
2017-09-29  1:40             ` Josh Poimboeuf
2017-09-29  8:01               ` Ingo Molnar
2017-09-29 10:32                 ` Ye Xiaolong
2017-09-29  7:51             ` Ingo Molnar
2017-09-29 15:29               ` Arnd Bergmann
2017-09-29  9:27           ` [tip:x86/urgent] " tip-bot for Josh Poimboeuf
2017-09-29 11:18           ` tip-bot for Josh Poimboeuf

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