linux-kernel - Re: [lkp-robot] [perf] 924726b2b5: double

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Date:   Fri, 28 Apr 2017 10:44:26 +0800
From:   Ye Xiaolong <xiaolong.ye@...el.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, tipbuild@...or.com, lkp@...org
Subject: Re: [lkp-robot] [perf]  924726b2b5: double_fault:#[##]

On 04/27, Sebastian Andrzej Siewior wrote:
>On 2017-04-27 10:58:36 [+0800], kernel test robot wrote:
>> 
>> FYI, we noticed the following commit:
>> 
>> commit: 924726b2b5e5000dfb8eb6032651baed1b1bdc6c ("perf: Cure hotplug lock ordering issues")
>> https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git smp/hotplug
>
>I can't find that commit in tip so I used
>   14aff62ede39 ("perf: Cure hotplug lock ordering issues")
>
>which should be the same thing.

Yes, git patch-id tells they are the same thing.

>
>> in testcase: boot
>> 
>> on test machine: qemu-system-x86_64 -enable-kvm -smp 2 -m 512M
>
>I booted this. I grabbed the command line the yaml file attached and
>quantal-core-x86_64.cgz from github.
>
>> [  203.023547] mmap: trinity-c0 (2509) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt.
>> [child0:2509] uid changed! Was: 0, now 252
>> [child1:2511] child exiting.
>> Bailing main loop. Exit reason: UID changed.
>> [watchdog] [2502] Watchdog exiting
>> [  204.078036] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC
>> [  204.078036] double fault: 0000 [#1] SMP DEBUG_PAGEALLOC
>
>I don't see that.
>

I can't reproduce it either after I rebuilt kernel for commit 14aff62ede39 for
6 times test.

>> To reproduce:
>> 
>>         git clone https://github.com/01org/lkp-tests.git
>>         cd lkp-tests
>>         bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email
>
>I tried that, too. The difference between running qemu manually and this
>seems that the manual approach runs the kernel a few times while this
>aborts after the first run. I attached my manual run. It looks similar
>(including the trinity segfault) but the kernels runs smooth.
>
>You don't seem to inject / load the kernels modules you compile.

Yes, as 0day built a large number of kernel everyday, we won't upload kernel
images and modules to github, it depends user to generate and append it to
initrd.

Thanks,
Xiaolong

>
>> Thanks,
>> Xiaolong
>
>Sebastian