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

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Message-ID: <d1e4eaba-2dcd-ec08-4e23-98ab8ea6c37b@redhat.com>
Date:   Thu, 28 Apr 2022 19:22:43 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Cc:     syzbot <syzbot+a8ad3ee1525a0c4b40ec@...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, mingo@...hat.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        vkuznets@...hat.com, wanpengli@...cent.com, x86@...nel.org
Subject: Re: [syzbot] WARNING in kvm_mmu_uninit_tdp_mmu (2)

On 4/28/22 17:32, Sean Christopherson wrote:
> On Tue, Apr 26, 2022, Maxim Levitsky wrote:
>> I can reproduce this in a VM, by running and CTRL+C'in my ipi_stress test,
> 
> Can you post your ipi_stress test?  I'm curious to see if I can repro, and also
> very curious as to what might be unique about your test.  I haven't been able to
> repro the syzbot test, nor have I been able to repro by killing VMs/tests.

Did you test with CONFIG_PREEMPT=y?

(BTW, the fact that it reproduces under 5.17 is a mixed blessing, 
because it means that we can analyze/stare at a simpler codebase).

Paolo