linux-kernel - Re: [kthread] 2e7d8748eb: last_state.is_incomplete

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Date:   Wed, 2 Sep 2020 15:53:13 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     qianli zhao <zhaoqianligood@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, axboe@...nel.dk,
        akpm@...ux-foundation.org, Felix.Kuehling@....com,
        John Stultz <john.stultz@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>, ben.dooks@...ethink.co.uk,
        bfields@...hat.com, cl@...k-chips.com,
        linux-kernel@...r.kernel.org, Qianli Zhao <zhaoqianli@...omi.com>,
        0day robot <lkp@...el.com>, lkp@...ts.01.org
Subject: Re: [kthread] 2e7d8748eb: last_state.is_incomplete_run

Thanks for the input, we do detect this on this commit but not its parent.
It may be merged into a wrong base branch or something else that
we are not aware of. And it's kind difficulty now for us to provide a
reproduction step for kexec issue, we will consider this further.

Best Regards,
Rong Chen


On 8/27/2020 11:49 AM, qianli zhao wrote:
> I did not see any exceptions related to my changes,the corresponding
> macro CONFIG_DEBUG_OBJECTS_KTHREAD is not enabled,so i think the issue
> has nothing to do with my changes
>
> Thanks
>
> On Thu, 20 Aug 2020 at 14:26, kernel test robot <rong.a.chen@...el.com> wrote:
>> Greeting,
>>
>> FYI, we noticed the following commit (built with gcc-9):
>>
>> commit: 2e7d8748eba7e32150cbd4f57129ea77d1255892 ("[RFC V2] kthread: add object debug support")
>> url: https://github.com/0day-ci/linux/commits/Qianli-Zhao/kthread-add-object-debug-support/20200812-131719
>> base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git fb893de323e2d39f7a1f6df425703a2edbdf56ea
>>
>> in testcase: boot
>>
>> on test machine: 8 threads Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz with 16G memory
>>
>> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>>
>>
>>
>> kernel boot failed by kexec:
>>
>> user  :notice:  [32m[  +0.371313]  [0m [33mLKP [0m: kexec loading...
>> user  :notice:  [32m[  +0.007118]  [0mkexec --noefi -l /opt/rootfs/tmp/pkg/linux/x86_64-rhel-8.3/gcc-9/2e7d8748eba7e32150cbd4f57129ea77d1255892/vmlinuz-5.8.0-12610-g2e7d8748eba7e --initrd=/opt/rootfs/tmp/initrd-concatenated
>>
>>
>>
>>
>> Thanks,
>> Rong Chen
>>