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SubjectRe: [syzbot] WARNING in kvm_mmu_uninit_tdp_mmu (2)
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On Thu, 2022-04-28 at 19:22 +0200, Paolo Bonzini wrote:
> 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?

yes, I test with CONFIG_PREEMPT but I only enabled it a day ago,
I think I had seen this warning before, but could bit, I'll check
if that fails without CONFIG_PREEMPT as well.


What I recently changed, is that I enabled lockdep and related settings
on all my machines and VMs, I enabled CONFIG_PREEMPT, and I also
switched to tdp_mmu on all systems.

Bugs are biting but it is better this way, especially to weed out
the last bugs of my nested avic code :)

Best regards,
Maxim Levitsky


>
> (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
>


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