linux-kernel - Re: arch/powerpc/kexec/crash.c:311:22: error: variable 'i' might be clobbered by 'longjmp' or 'vfork'

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Date:   Fri, 4 Nov 2022 15:20:50 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Alexander Potapenko <glider@...gle.com>,
        kernel test robot <lkp@...el.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        Maciej Żenczykowski <maze@...gle.com>
Subject: Re: arch/powerpc/kexec/crash.c:311:22: error: variable 'i' might be
 clobbered by 'longjmp' or 'vfork'



On 10/31/2022 4:27 PM, Alexander Potapenko wrote:
> Looks unrelated to this 2-year old commit?

Hi Alexander,

Sorry for the inconvenience, the commit here is not the root cause for
this error, we'll add it to ignore list.

Best Regards,
Rong Chen


> 
> On Sun, Oct 30, 2022 at 6:12 PM kernel test robot <lkp@...el.com> wrote:
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   882ad2a2a8ffa1defecdf907052f04da2737dc46
>> commit: f0fe00d4972a8cd4b98cc2c29758615e4d51cdfe security: allow using Clang's zero initialization for stack variables
>> date:   2 years, 4 months ago
>> config: powerpc-wii_defconfig
>> compiler: powerpc-linux-gcc (GCC) 12.1.0
>> reproduce (this is a W=1 build):
>>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>          chmod +x ~/bin/make.cross
>>          # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f0fe00d4972a8cd4b98cc2c29758615e4d51cdfe
>>          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>          git fetch --no-tags linus master
>>          git checkout f0fe00d4972a8cd4b98cc2c29758615e4d51cdfe
>>          # save the config file
>>          mkdir build_dir && cp config build_dir/.config
>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/
>>
>> If you fix the issue, kindly add following tag where applicable
>> | Reported-by: kernel test robot <lkp@...el.com>
>>
>> All errors (new ones prefixed by >>):
>>
>>     arch/powerpc/kexec/crash.c: In function 'default_machine_crash_shutdown':
>>>> arch/powerpc/kexec/crash.c:311:22: error: variable 'i' might be clobbered by 'longjmp' or 'vfork' [-Werror=clobbered]
>>       311 |         unsigned int i;
>>           |                      ^
>>     cc1: all warnings being treated as errors
>>
>>
>> vim +311 arch/powerpc/kexec/crash.c
>>
>> 496b010e1e70a9 arch/powerpc/kernel/crash.c Michael Neuling  2008-01-18  308
>> cc53291521701f arch/powerpc/kernel/crash.c Michael Ellerman 2005-12-04  309  void default_machine_crash_shutdown(struct pt_regs *regs)
>> cc53291521701f arch/powerpc/kernel/crash.c Michael Ellerman 2005-12-04  310  {
>> 496b010e1e70a9 arch/powerpc/kernel/crash.c Michael Neuling  2008-01-18 @311     unsigned int i;
>>
>> :::::: The code at line 311 was first introduced by commit
>> :::::: 496b010e1e70a9b4286fa34f19523f24a194f119 [POWERPC] kdump shutdown hook support
>>
>> :::::: TO: Michael Neuling <mikey@...ling.org>
>> :::::: CC: Paul Mackerras <paulus@...ba.org>
>>
>> --
>> 0-DAY CI Kernel Test Service
>> https://01.org/lkp
> 
> 
>