linux-kernel - Re: [PATCH] timekeeping: Align tick_sched_timer() with the HZ tick. -- regression report

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Date:   Thu, 15 Jun 2023 10:03:56 +0100
From:   "Richard W.M. Jones" <rjones@...hat.com>
To:     Mathias Krause <minipli@...ecurity.net>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Gusenleitner Klaus <gus@...a.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH] timekeeping: Align tick_sched_timer() with the HZ tick.
 -- regression report

On Wed, Jun 14, 2023 at 12:59:46AM +0200, Mathias Krause wrote:
> This patch causes VM boot hangs for us. It took a while to identify as 
> the boot hangs were only ~1 out of 30 but it's clearly it. Reverting 
> the commit got me 100 boots in a row without any issue.

FWIW I have quite a nice test program for catching these sorts of boot
hangs, see attached.  You need to change the VMLINUX define to point
to your vmlinux or vmlinuz file.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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