linux-kernel - Re: [syzbot] general protection fault in rcu_segcblist

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Date:   Wed, 6 Oct 2021 22:52:05 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     syzbot <syzbot+7590ddacf9f333c18f6c@...kaller.appspotmail.com>
Cc:     axboe@...nel.dk, bp@...en8.de, hpa@...or.com, jack@...e.cz,
        jmattson@...gle.com, joro@...tes.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        paolo.valente@...aro.org, pbonzini@...hat.com, reijiw@...gle.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        vkuznets@...hat.com, wanpengli@...cent.com, x86@...nel.org
Subject: Re: [syzbot] general protection fault in rcu_segcblist_enqueue

On Wed, Oct 06, 2021, syzbot wrote:
> syzbot suspects this issue was fixed by commit:
> 
> commit 067a456d091d05fdae32cae350410d905968b645
> Author: Sean Christopherson <seanjc@...gle.com>
> Date:   Tue Jul 13 16:32:43 2021 +0000
> 
>     KVM: SVM: Require exact CPUID.0x1 match when stuffing EDX at INIT
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15d871b7300000
> start commit:   0319b848b155 binfmt: a.out: Fix bogus semicolon
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=faed7df0f442c217
> dashboard link: https://syzkaller.appspot.com/bug?extid=7590ddacf9f333c18f6c
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1308d0ed300000
> 
> If the result looks correct, please mark the issue as fixed by replying with:
> 
> #syz fix: KVM: SVM: Require exact CPUID.0x1 match when stuffing EDX at INIT

LOL, close?  At least syzbot found a KVM commit.

#syz fix: KVM: x86: Handle SRCU initialization failure during page track init