linux-kernel - Re: [kbuild-all] Re: [ebiederm-user-namespace:signal-for-v5.17 4/12] arch/x86/kernel/dumpstack.o: warning: objtool: oops_end() falls through to next function show

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Date:   Wed, 15 Dec 2021 09:35:43 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [kbuild-all] Re: [ebiederm-user-namespace:signal-for-v5.17 4/12]
 arch/x86/kernel/dumpstack.o: warning: objtool: oops_end() falls through to
 next function show_opcodes()



On 12/15/21 01:29, Eric W. Biederman wrote:
> kernel test robot <lkp@...el.com> writes:
>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git signal-for-v5.17
>> head:   6b1248798eb6f6d5285db214299996ecc5dc1e6b
>> commit: 0e25498f8cd43c1b5aa327f373dd094e9a006da7 [4/12] exit: Add and use make_task_dead.
>> config: x86_64-randconfig-a011-20211213 (https://download.01.org/0day-ci/archive/20211214/202112140949.Uq5sFKR1-lkp@intel.com/config)
>> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
>> reproduce (this is a W=1 build):
>>          # https://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git/commit/?id=0e25498f8cd43c1b5aa327f373dd094e9a006da7
>>          git remote add ebiederm-user-namespace https://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git
>>          git fetch --no-tags ebiederm-user-namespace signal-for-v5.17
>>          git checkout 0e25498f8cd43c1b5aa327f373dd094e9a006da7
>>          # save the config file to linux build tree
>>          mkdir build_dir
>>          make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/ kernel/ lib/kunit/
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> All warnings (new ones prefixed by >>):
>>
>>>> lib/kunit/kunit-example-test.o: warning: objtool: .text.unlikely: unexpected end of section
>> --
>>>> arch/x86/kernel/dumpstack.o: warning: objtool: oops_end() falls through to next function show_opcodes()
> I am confused.  This change patches objtool to rename
> rewind_stack_and_do_exit to rewind_stack_and_make_dead in the list
> global_noreturns in tools/objtool/check.c
>
> There is no other change to oops_end other than that renaming.
>
> Did the robot somehow mange to run an old version of objtool while
> building and this get this error?
>
> I tried and I am not currently able to reproduce this error.  Do you
> have any additional pointers on how I might reproduce this?

Hi Eric,

The reproduce step in report based on a full build, I can reproduce the 
warnings with the below command:

   make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

Best Regards,
Rong Chen