linux-kernel - Re: [BUG] Guest OSes die simultaneously (bisected)

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Message-ID: <ZZbl7KqomDOR+HUC@tassilo>
Date: Thu, 4 Jan 2024 09:07:56 -0800
From: Andi Kleen <ak@...ux.intel.com>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
	Sean Christopherson <seanjc@...gle.com>,
	Like Xu <like.xu@...ux.intel.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Luwei Kang <luwei.kang@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Breno Leitao <leitao@...ian.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [BUG] Guest OSes die simultaneously (bisected)

> My (completely random) guess is that there is some rare combination
> of events that causes this code to fail.  If so, is it feasible to
> construct a test that makes this rare combination of events less rare,
> so that similar future bugs are caught more quickly?

Yes, I tested something similar before. What you need is create lots of 
PMIs with perf (running perf top should be enough) and a workload that creates
lots of exits in a guest (e.g. running fio on a virtio device). This 
will stress test this particular path.

-Andi