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From: "Chen, Rong A" <[email protected]>
To: Peter Zijlstra <[email protected]>, kernel test robot <[email protected]>
Cc: [email protected],
	GNU/Weeb Mailing List <[email protected]>,
	[email protected], Sasha Levin <[email protected]>,
	Borislav Petkov <[email protected]>
Subject: Re: [kbuild-all] Re: [ammarfaizi2-block:stable/linux-stable-rc/queue/5.15 146/150] kernel/futex.o: warning: objtool: futex_atomic_op_inuser()+0xb8: unreachable instruction
Date: Thu, 12 May 2022 17:30:20 +0800	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>



On 5/12/2022 4:17 PM, Peter Zijlstra wrote:
> On Thu, May 12, 2022 at 10:00:33AM +0800, kernel test robot wrote:
>> tree:   https://github.com/ammarfaizi2/linux-block stable/linux-stable-rc/queue/5.15
>> head:   305e905f70311e1b49cc730931a19c3e364f4d8c
>> commit: 45dc9d706619a6814e4063d5431483f94badb5a1 [146/150] x86: Add straight-line-speculation mitigation
>> config: x86_64-randconfig-m001-20220509 (https://download.01.org/0day-ci/archive/20220512/[email protected]/config)
>> compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
>> reproduce (this is a W=1 build):
>>          # https://github.com/ammarfaizi2/linux-block/commit/45dc9d706619a6814e4063d5431483f94badb5a1
>>          git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
>>          git fetch --no-tags ammarfaizi2-block stable/linux-stable-rc/queue/5.15
>>          git checkout 45dc9d706619a6814e4063d5431483f94badb5a1
>>          # save the config file
>>          mkdir build_dir && cp config build_dir/.config
>>          make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <[email protected]>
>>
>> All warnings (new ones prefixed by >>):
>>
>>>> kernel/futex.o: warning: objtool: futex_atomic_op_inuser()+0xb8: unreachable instruction
>> --
>>>> mm/madvise.o: warning: objtool: madvise_behavior()+0x69: unreachable instruction
>> --
>>>> kernel/bpf/btf.o: warning: objtool: __btf_resolve_size()+0x72: unreachable instruction
> 
> Would it be possible for the robot to include the output of this script:

Hi Peter,

Thanks for your advice, we'll support it asap.

Best Regards,
Rong Chen

> 
>    https://lkml.kernel.org/r/3eb3f091fd6bd9caba50392ceab98ce756804f3b.1650578171.git.jpoimboe@redhat.com
> 
> for each objtool warning it gives (as run on vmlinux.o):
> 
>    $ ./scripts/objdump-func build-output/vmlinux.o futex_atomic_op_inuser
>    $ ./scripts/objdump-func build-output/vmlinux.o madvise_behavior
>    $ ./scripts/objdump-func build-output/vmlinux.o __btf_resolve_size
> 
> etc.. that would make it easier to see what the problem is without
> having to reproduce the build.
> 
> A super wild guess; but try this commit:
> 
>    1ffbe4e935f9 ("objtool: Default ignore INT3 for unreachable")
> 
> _______________________________________________
> kbuild-all mailing list -- [email protected]
> To unsubscribe send an email to [email protected]
> 

  reply	other threads:[~2022-05-12  9:30 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-12  2:00 [ammarfaizi2-block:stable/linux-stable-rc/queue/5.15 146/150] kernel/futex.o: warning: objtool: futex_atomic_op_inuser()+0xb8: unreachable instruction kernel test robot
2022-05-12  8:17 ` Peter Zijlstra
2022-05-12  9:30   ` Chen, Rong A [this message]
2022-05-12 17:11   ` Josh Poimboeuf

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