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From: Dmitry Vyukov <dvyukov@google.com>
Date: Mon, 11 Jun 2018 09:25:05 +0200
Message-ID: <CACT4Y+aDpO2VLATSv5YJeS6gYe7eB_67Lq9hQ64+rs78YE5org@mail.gmail.com>
Subject: Re: [memcg:akpm/kcov 4/4] /tmp/ccMETRHQ.s:35: Error: .err encountered
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Sender: owner-linux-mm@kvack.org
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To: Michal Hocko <mhocko@suse.com>
Cc: kbuild test robot <lkp@intel.com>, kbuild-all@01.org, Linux-MM <linux-mm@kvack.org>, Andrew Morton <akpm@linux-foundation.org>

On Mon, Jun 11, 2018 at 9:09 AM, Michal Hocko <mhocko@suse.com> wrote:
> On Mon 11-06-18 14:57:10, kbuild test robot wrote:
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git akpm/kcov
>> head:   99027ccd1ec1b31fc74d63df2f13945ae44da62a
>> commit: 99027ccd1ec1b31fc74d63df2f13945ae44da62a [4/4] arm: port KCOV to arm
>> config: arm-allmodconfig (attached as .config)
>> compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
>> reproduce:
>>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>         chmod +x ~/bin/make.cross
>>         git checkout 99027ccd1ec1b31fc74d63df2f13945ae44da62a
>>         # save the attached .config to linux build tree
>>         make.cross ARCH=arm
>>
>> All errors (new ones prefixed by >>):
>>
>>    /tmp/ccMETRHQ.s: Assembler messages:
>> >> /tmp/ccMETRHQ.s:35: Error: .err encountered
>>    /tmp/ccMETRHQ.s:36: Error: .err encountered
>>    /tmp/ccMETRHQ.s:37: Error: .err encountered
>
> Huh, what is this supposed to mean?


I think that Arnd has fixed this with "ARM: disable KCOV for
trusted foundations code" now:
https://patchwork.kernel.org/patch/10434909/
The failure mode he referenced matches reported here.