linux-kernel - Re: [PREEMPT_RT] 8250 IRQ lockup when flooding serial console (was Re: [ANNOUNCE] v5.4.28-rt19)

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Message-ID: <20200423104559.rgplz6rqk6sg4kz7@linutronix.de>
Date:   Thu, 23 Apr 2020 12:45:59 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Daniel Wagner <dwagner@...e.de>
Subject: Re: [PREEMPT_RT] 8250 IRQ lockup when flooding serial console (was
 Re: [ANNOUNCE] v5.4.28-rt19)

On 2020-04-23 11:12:59 [+0200], Jiri Kosina wrote:
> On Thu, 23 Apr 2020, Jiri Kosina wrote:
> 
> > > I'm pleased to announce the v5.4.28-rt19 patch set. 
> > 
> > First, I don't believe this is necessarily a regression coming with this 
> > particular version, but this is the first kernel where I tried this and it 
> > crashed.
> 
> I just tried with 5.6.4-rt3, and I can make it explode exactly the same 
> way:

I though I dealt with it. In the past it triggered also with threadirqs
on !RT but this isn't the case anymore. It still explodes on RT. Let me
look…

Sebastian