linux-kernel - Re: [BUG almost bisected] Splat in dequeue_rt

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Message-ID: <20241007093412.GA4879@noisy.programming.kicks-ass.net>
Date: Mon, 7 Oct 2024 11:34:12 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: vschneid@...hat.com, linux-kernel@...r.kernel.org, sfr@...b.auug.org.au,
	linux-next@...r.kernel.org, kernel-team@...a.com
Subject: Re: [BUG almost bisected] Splat in dequeue_rt_stack() and build error

On Sun, Oct 06, 2024 at 01:44:53PM -0700, Paul E. McKenney wrote:

> > I've given it 200*20m and the worst I got was one dl-server double
> > enqueue. I'll go stare at that I suppose.
> 
> With your patch, I got 24 failures out of 100 TREE03 runs of 18 hours
> each.  The failures were different, though, mostly involving boost
> failures in which RCU priority boosting didn't actually result in the
> low-priority readers getting boosted.  An ftrace/event-trace dump of
> such a situation is shown below.

Urgh, WTF and more of that. Let me go ponder things.

Thanks for testing.