linux-kernel - Re: 5.11 new lockdep warning related to led-class code (also may involve ata / piix controller)

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Date:   Tue, 12 Jan 2021 23:30:15 +0100
From:   Pavel Machek <pavel@....cz>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Dan Murphy <dmurphy@...com>,
        linux-ide@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: 5.11 new lockdep warning related to led-class code (also may
 involve ata / piix controller)

Hi!

> Booting a 5.11-rc2 kernel with lockdep enabled inside a virtualbox vm (which still
> emulates good old piix ATA controllers) I get the below lockdep splat early on during boot:
> 
> This seems to be led-class related but also seems to have a (P)ATA
> part to it. To the best of my knowledge this is a new problem in
> 5.11 .

This is on my for-next branch:

commit 9a5ad5c5b2d25508996f10ee6b428d5df91d9160 (HEAD -> for-next, origin/for-next)

    leds: trigger: fix potential deadlock with libata
    
    We have the following potential deadlock condition:
    
     ========================================================
     WARNING: possible irq lock inversion dependency detected
     5.10.0-rc2+ #25 Not tainted
     --------------------------------------------------------
     swapper/3/0 just changed the state of lock:
     ffff8880063bd618 (&host->lock){-...}-{2:2}, at: ata_bmdma_interrupt+0x27/0x200
     but this lock took another, HARDIRQ-READ-unsafe lock in the past:
      (&trig->leddev_list_lock){.+.?}-{2:2}

If I'm not mistaken, that should fix your issue.

Best regards,

									Pavel
-- 
http://www.livejournal.com/~pavelmachek

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