From: Dmitry Vyukov <dvyukov@google.com>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Alexander Potapenko <glider@google.com>,
Marco Elver <elver@google.com>,
syzbot <syzbot+6b36bab98e240873fd5a@syzkaller.appspotmail.com>,
bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com,
jmattson@google.com, joro@8bytes.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
mingo@redhat.com, seanjc@google.com,
syzkaller-bugs@googlegroups.com, tglx@linutronix.de,
vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org
Subject: Re: [syzbot] upstream build error (17)
Date: Thu, 7 Apr 2022 09:18:36 +0200 [thread overview]
Message-ID: <CACT4Y+ZB4oBVks7hF5shnW8FDH2c6O6UWoLVtyZ1ccp8AJhmcw@mail.gmail.com> (raw)
In-Reply-To: <CAKwvOd=-4S1nV=qa3CGNPTAMOv9fGYZsh8hQPXDH1MpowYDX=w@mail.gmail.com>
On Wed, 6 Apr 2022 at 20:26, Nick Desaulniers <ndesaulniers@google.com> wrote:
>
> On Wed, Apr 6, 2022 at 10:33 AM Paolo Bonzini <pbonzini@redhat.com> wrote:
> >
> > 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@syzkaller.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.
>
> Yep.
> $ wget -q https://syzkaller.appspot.com/x/.config\?x\=eba855fbe3373b4f
> -O - | grep CONFIG_KASAN=y
> CONFIG_KASAN=y
> https://github.com/ClangBuiltLinux/linux/issues/39 (our oldest still-open issue)
The issue is due to:
commit b9080ba4a6ec56447f263082825a4fddb873316b
Date: Wed Mar 23 12:21:10 2022 +0100
x86/defconfig: Enable WERROR
Marco has disabled it in syzbot configs:
https://github.com/google/syzkaller/commit/53c67432e69b0df4ff64448b944cbffaecec20f4
#syz invalid
prev parent reply other threads:[~2022-04-07 7:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-06 16:20 [syzbot] upstream build error (17) syzbot
2022-04-06 17:33 ` Paolo Bonzini
2022-04-06 18:26 ` Nick Desaulniers
2022-04-07 7:18 ` Dmitry Vyukov [this message]
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