linux-kernel - Re: Hung tasks due to a AB-BA deadlock between the leds_list

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Message-ID: <dfb48278-8b7b-401d-ae8e-579d80e3c258@redhat.com>
Date: Fri, 7 Jun 2024 12:22:32 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Genes Lists <lists@...ience.com>, Jakub Kicinski <kuba@...nel.org>,
 Andrew Lunn <andrew@...n.ch>
Cc: Linux regressions mailing list <regressions@...ts.linux.dev>,
 Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
 Linux LEDs <linux-leds@...r.kernel.org>,
 Heiner Kallweit <hkallweit1@...il.com>, linux-kernel@...r.kernel.org,
 netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
 pabeni@...hat.com, johanneswueller@...il.com,
 "Russell King (Oracle)" <linux@...linux.org.uk>
Subject: Re: Hung tasks due to a AB-BA deadlock between the leds_list_lock
 rwsem and the rtnl mutex

Hi Gene,

On 6/6/24 4:25 PM, Genes Lists wrote:
> On Thu, 2024-06-06 at 06:39 -0700, Jakub Kicinski wrote:
>> 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..
> 
> I assume this deadlock is unrelated to the filesystem stalls reported here:
> 
>    https://lore.kernel.org/lkml/da8710eddca32677cf3c195000416121045eb811.camel@sapience.com/ <https://lore.kernel.org/lkml/da8710eddca32677cf3c195000416121045eb811.camel@sapience.com/>

Right that one is unrelated, but the revert which I just submitted should
fix your other report:

https://lore.kernel.org/all/9d189ec329cfe68ed68699f314e191a10d4b5eda.camel@sapience.com/

I believe you have already worked around that one by blacklisting
the ledtrig-netdev module.

Regards,

Hans