linux-kernel - 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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Message-ID: <87k0g7t7ry.fsf@email.froward.int.ebiederm.org>
Date:   Tue, 14 Dec 2021 11:29:05 -0600
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: 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()

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?

Eric