linux-kernel - Re: drivers/acpi/acpi_processor.o: warning: objtool: acpi_duplicate_processor_id()+0x49: stack state mismatch: cfa1=7+8 cfa2=6+16

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Message-ID: <4d252299-9398-286d-c882-5656916bf0f8@linux.com>
Date:   Thu, 8 Nov 2018 21:59:28 +0300
From:   Alexander Popov <alex.popov@...ux.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: drivers/acpi/acpi_processor.o: warning: objtool:
 acpi_duplicate_processor_id()+0x49: stack state mismatch: cfa1=7+8 cfa2=6+16

On 06.11.2018 18:50, kbuild test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   163c8d54a997153ee1a1e07fcac087492ad85b37
> commit: 10e9ae9fabaf96c8e5227c1cd4827d58b3aa406d gcc-plugins: Add STACKLEAK plugin for tracking the kernel stack
> date:   9 weeks ago
> config: x86_64-randconfig-u0-11062149 (attached as .config)
> compiler: gcc-5 (Debian 5.5.0-3) 5.4.1 20171010
> reproduce:
>         git checkout 10e9ae9fabaf96c8e5227c1cd4827d58b3aa406d
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
>
>>> drivers/acpi/acpi_processor.o: warning: objtool: acpi_duplicate_processor_id()+0x49: stack state mismatch: cfa1=7+8 cfa2=6+16

Hello!

I have reproduced this problem. It looks like stackleak_cleanup_execute() does
something wrong with RTL which is generated by gcc-5.

I'm working on this.

Best regards,
Alexander