linux-kernel - Re: [syzbot] upstream build error (17)

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Date:   Wed, 6 Apr 2022 19:33:15 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     syzbot <syzbot+6b36bab98e240873fd5a@...kaller.appspotmail.com>,
        bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
        jmattson@...gle.com, joro@...tes.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        mingo@...hat.com, seanjc@...gle.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        vkuznets@...hat.com, wanpengli@...cent.com, x86@...nel.org
Subject: Re: [syzbot] upstream build error (17)

On 4/6/22 18:20, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    3e732ebf7316 Merge tag 'for_linus' of git://git.kernel.org..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=10ca0687700000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=eba855fbe3373b4f
> dashboard link: https://syzkaller.appspot.com/bug?extid=6b36bab98e240873fd5a
> compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+6b36bab98e240873fd5a@...kaller.appspotmail.com
> 
> arch/x86/kvm/emulate.c:3332:5: error: stack frame size (2552) exceeds limit (2048) in function 'emulator_task_switch' [-Werror,-Wframe-larger-than]
> drivers/block/loop.c:1524:12: error: stack frame size (2648) exceeds limit (2048) in function 'lo_ioctl' [-Werror,-Wframe-larger-than]

I spot-checked these two and the stack frame is just 144 and 320 bytes 
respectively on a normal compile.  This is probably just the effect of 
some of the sanitizer options.

Paolo