Re: [syzbot] [kvm?] WARNING: locking bug in kvm_xen_set_evtchn_fast

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On Tue, 2024-11-26 at 06:24 -0800, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 560af5dc839eef08a273908f390cfefefb82aa04
> Author: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
> Date:   Wed Oct 9 15:45:03 2024 +0000
> 
>     lockdep: Enable PROVE_RAW_LOCK_NESTING with PROVE_LOCKING.

That's not it; this has always been broken with PREEMPT_RT I think.
There was an attempt to fix it in
https://lore.kernel.org/all/20240227115648.3104-8-dwmw2@xxxxxxxxxxxxx/

I'll dust that off and try again.

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