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Date:   Tue, 27 Jul 2021 18:43:21 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Ben Greear <greearb@candelatech.com>
Cc:     "stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: Re: very long boot times in 5.13 stable.
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On Tue, Jul 27, 2021 at 09:10:11AM -0700, Ben Greear wrote:
> Hello,
> 
> My system was stable with 5.13.0, though there was a KASAN warning.
> So, I upgrade to 5.13.5, and now it takes a very long time to fully boot to
> login prompt, and I see this splat in the logs.
> 
> I'm working on bisecting, but if someone has a clue, please let me know.
> 
> [ 2187.021338] irq 4: nobody cared (try booting with the "irqpoll" option)

Have you tried booting with that option?