linux-kernel - Re: Bug 218665 - nohz_full=0 prevents kernel from booting

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Message-ID: <ZiCAXq-jS1Z6vgCK@slm.duckdns.org>
Date: Wed, 17 Apr 2024 16:07:26 -1000
From: Tejun Heo <tj@...nel.org>
To: Linux regressions mailing list <regressions@...ts.linux.dev>
Cc: Bjorn Andersson <andersson@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Bug 218665 - nohz_full=0 prevents kernel from booting

Hello, Thorsten.

On Wed, Apr 17, 2024 at 07:48:33AM +0200, Linux regression tracking (Thorsten Leemhuis) wrote:
> > Can you elaborate why Bjorn's case is different?
> 
> Well "not booting at all when using 'nohz_full=0'"[as reported two
> times] and "I start neovim, send SIGSTOP (i.e. ^Z) to it, start another
> neovim instance and upon sending SIGSTOP to that instance all of
> userspace locks up - 100% reproducible."[while no 'nohz_full=0' in use]
> at least on the first sight to and outsider sound a lot like different
> problems to me -- but of course that impression might be wrong and you
> know better about these things.

You are right. That is very different.

> > I was assuming it was the
> > same problem and that Oleg's fixes would address the issue.
> 
> Bjorn, could you give it a try?

Yeah, I'm curious whether it's just a different symptom of the same problem.

Thanks.

-- 
tejun