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From:   Marco Elver <elver@google.com>
Date:   Mon, 22 Jun 2020 13:06:23 +0200
Message-ID: <CANpmjNMJL2euWekeJ-pRcW7-BQaDCmfCSr=8Z3Mfnz-ugtUX4g@mail.gmail.com>
Subject: Re: linux-next build error (9)
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     syzbot <syzbot+dbf8cf3717c8ef4a90a0@syzkaller.appspotmail.com>,
        Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>, jmattson@google.com,
        joro@8bytes.org, kvm@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>,
        Ingo Molnar <mingo@redhat.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        sean.j.christopherson@intel.com,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
        Thomas Gleixner <tglx@linutronix.de>, vkuznets@redhat.com,
        wanpengli@tencent.com, "the arch/x86 maintainers" <x86@kernel.org>,
        Dmitry Vyukov <dvyukov@google.com>
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On Mon, 22 Jun 2020 at 11:49, Peter Zijlstra <peterz@infradead.org> wrote:
>
> On Mon, Jun 22, 2020 at 02:37:12AM -0700, syzbot wrote:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    27f11fea Add linux-next specific files for 20200622
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=138dc743100000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=41c659db5cada6f4
> > dashboard link: https://syzkaller.appspot.com/bug?extid=dbf8cf3717c8ef4a90a0
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+dbf8cf3717c8ef4a90a0@syzkaller.appspotmail.com
> >
> > ./arch/x86/include/asm/kvm_para.h:99:29: error: inlining failed in call to always_inline 'kvm_handle_async_pf': function attribute mismatch
> > ./arch/x86/include/asm/processor.h:824:29: error: inlining failed in call to always_inline 'prefetchw': function attribute mismatch
> > ./arch/x86/include/asm/current.h:13:44: error: inlining failed in call to always_inline 'get_current': function attribute mismatch
> > arch/x86/mm/fault.c:1353:1: error: inlining failed in call to always_inline 'handle_page_fault': function attribute mismatch
> > ./arch/x86/include/asm/processor.h:576:29: error: inlining failed in call to always_inline 'native_swapgs': function attribute mismatch
> > ./arch/x86/include/asm/fsgsbase.h:33:38: error: inlining failed in call to always_inline 'rdgsbase': function attribute mismatch
> > ./arch/x86/include/asm/irq_stack.h:40:29: error: inlining failed in call to always_inline 'run_on_irqstack_cond': function attribute mismatch
> > ./include/linux/debug_locks.h:15:28: error: inlining failed in call to always_inline '__debug_locks_off': function attribute mismatch
> > ./include/asm-generic/atomic-instrumented.h:70:1: error: inlining failed in call to always_inline 'atomic_add_return': function attribute mismatch
> > kernel/locking/lockdep.c:396:29: error: inlining failed in call to always_inline 'lockdep_recursion_finish': function attribute mismatch
> > kernel/locking/lockdep.c:4725:5: error: inlining failed in call to always_inline '__lock_is_held': function attribute mismatch
>
> Hurmph, I though that was cured in GCC >= 8. Marco?

Yeah, time to upgrade syzbot's compiler. This experimental gcc 9.0.0
still has the bug, but stable gcc 9 doesn't. For now, I think this
requires no fixes on the kernel side.

Thanks,
-- Marco