linux-kernel - Re: Shutdown-time hangs in -next in locktorture

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Message-ID: <20251220125201.GZ3911114@noisy.programming.kicks-ass.net>
Date: Sat, 20 Dec 2025 13:52:01 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	linux-next@...r.kernel.org, Stephen Rothwell <sfr@...b.auug.org.au>,
	Mark Brown <broonie@...nel.org>, kernel-team@...a.com
Subject: Re: Shutdown-time hangs in -next in locktorture

On Fri, Dec 19, 2025 at 04:29:26PM -0800, Paul E. McKenney wrote:
> Hello, Peter,
> 
> I started hitting shutdown-time hangs in next-20251217 which persist
> in next-20251219.  This hang happens on both x86 and arm64.  Once I
> figured out that the failure is high probability, but not deterministic,
> bisection converged here:
> 
> 5d1f0b2f278e ("sched/core: Rework sched_class::wakeup_preempt() and rq_modified_*()")

That commit no longer exists in tip/sched/core; it was fixed a few days
ago, except other problems made -next use an old tip branch which has
caused this fix to have delayed visibility :-(