linux-kernel - Re: [syzbot] [kvm?] WARNING: locking bug in kvm_xen_set_evtchn

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Message-ID: <391f1c231cfce2c4107494b47114ed049c4d6266.camel@infradead.org>
Date: Tue, 26 Nov 2024 14:49:40 +0000
From: David Woodhouse <dwmw2@...radead.org>
To: syzbot <syzbot+919877893c9d28162dc2@...kaller.appspotmail.com>, 
 bigeasy@...utronix.de, boqun.feng@...il.com, bp@...en8.de, 
 dave.hansen@...ux.intel.com, hdanton@...a.com, hpa@...or.com,
 kvm@...r.kernel.org,  linux-kernel@...r.kernel.org, longman@...hat.com,
 mingo@...hat.com, paul@....org,  pbonzini@...hat.com, seanjc@...gle.com,
 syzkaller-bugs@...glegroups.com,  tglx@...utronix.de, x86@...nel.org
Subject: Re: [syzbot] [kvm?] WARNING: locking bug in kvm_xen_set_evtchn_fast

On Tue, 2024-11-26 at 06:24 -0800, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 560af5dc839eef08a273908f390cfefefb82aa04
> Author: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> 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@infradead.org/

I'll dust that off and try again.

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