Re: Hung tasks due to a AB-BA deadlock between the leds_list_lock rwsem and the rtnl mutex

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To: Andrew Lunn <andrew@xxxxxxx>, Hans de Goede <hdegoede@xxxxxxxxxx>
Subject: Re: Hung tasks due to a AB-BA deadlock between the leds_list_lock rwsem and the rtnl mutex
From: Jakub Kicinski <kuba@xxxxxxxxxx>
Date: Thu, 6 Jun 2024 06:39:02 -0700
Cc: Linux regressions mailing list <regressions@xxxxxxxxxxxxxxx>, Pavel Machek <pavel@xxxxxx>, Lee Jones <lee@xxxxxxxxxx>, Linux LEDs <linux-leds@xxxxxxxxxxxxxxx>, Heiner Kallweit <hkallweit1@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, davem@xxxxxxxxxxxxx, edumazet@xxxxxxxxxx, pabeni@xxxxxxxxxx, johanneswueller@xxxxxxxxx, "Russell King (Oracle)" <linux@xxxxxxxxxxxxxxx>, Genes Lists <lists@xxxxxxxxxxxx>
In-reply-to: <c912d1f7-7039-4f55-91ac-028a906c1387@lunn.ch>
References: <9d189ec329cfe68ed68699f314e191a10d4b5eda.camel@sapience.com> <15a0bbd24cd01bd0b60b7047958a2e3ab556ea6f.camel@sapience.com> <ZliHhebSGQYZ/0S0@shell.armlinux.org.uk> <42d498fc-c95b-4441-b81a-aee4237d1c0d@leemhuis.info> <618601d8-f82a-402f-bf7f-831671d3d83f@redhat.com> <01fc2e30-eafe-495c-a62d-402903fd3e2a@lunn.ch> <9d821cea-507f-4674-809c-a4640119c435@redhat.com> <c912d1f7-7039-4f55-91ac-028a906c1387@lunn.ch>

On Thu, 6 Jun 2024 15:12:54 +0200 Andrew Lunn wrote:
> > So it has been almost a week and no reply from Heiner. Since this is
> > causing real issues for users out there I think a revert of 66601a29bb23
> > should be submitted to Linus and then backported to the stable kernels.
> > to fix the immediate issue at hand.  
> 
> Agreed.

Please submit..

Follow-Ups:
- Re: Hung tasks due to a AB-BA deadlock between the leds_list_lock rwsem and the rtnl mutex
  - From: Hans de Goede
- Re: Hung tasks due to a AB-BA deadlock between the leds_list_lock rwsem and the rtnl mutex
  - From: Genes Lists

References:
- Hung tasks due to a AB-BA deadlock between the leds_list_lock rwsem and the rtnl mutex (was: 6.9.3 Hung tasks)
  - From: Linux regression tracking (Thorsten Leemhuis)
- Re: Hung tasks due to a AB-BA deadlock between the leds_list_lock rwsem and the rtnl mutex
  - From: Hans de Goede
- Re: Hung tasks due to a AB-BA deadlock between the leds_list_lock rwsem and the rtnl mutex
  - From: Andrew Lunn
- Re: Hung tasks due to a AB-BA deadlock between the leds_list_lock rwsem and the rtnl mutex
  - From: Hans de Goede
- Re: Hung tasks due to a AB-BA deadlock between the leds_list_lock rwsem and the rtnl mutex
  - From: Andrew Lunn

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