linux-kernel - Re: [syzbot] WARNING in static_key_slow_try

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Message-ID: <YWWqG3xF6KAHBU2O@google.com>
Date:   Tue, 12 Oct 2021 15:30:35 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Reiji Watanabe <reijiw@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        syzkaller-bugs@...glegroups.com, linux-kernel@...r.kernel.org,
        syzbot <syzbot+9fc046ab2b0cf295a063@...kaller.appspotmail.com>
Subject: Re: [syzbot] WARNING in static_key_slow_try_dec (2)

On Sun, Oct 10, 2021, Tetsuo Handa wrote:
> Hello.
> 
> Commit 4547700a4d190ac4 ("KVM: x86: Consolidate APIC base RESET initialization code")

That's definitely where the error was made visible, but commit 421221234ada ("KVM:
x86: Open code necessary bits of kvm_lapic_set_base() at vCPU RESET") is the real
culprit.  I'll send a patch later today.  I'm leaning toward a partial revert with
some extra comments.

Thanks for the debug!  I was having trouble reproducing the syzbot report.