linux-kernel - Re: locking problems in iwlwifi? was Re: 6.16-rcX: crashing way too often on thinkpad X220

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Message-ID: <871pq5qlgj.ffs@tglx>
Date: Fri, 25 Jul 2025 00:21:16 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Waiman Long <llong@...hat.com>, Pavel Machek <pavel@....cz>, Waiman Long
 <llong@...hat.com>
Cc: kernel list <linux-kernel@...r.kernel.org>, mingo@...hat.com,
 bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
 peterz@...radead.org, will@...nel.org, miriam.rachel.korenblit@...el.com,
 linux-wireless@...r.kernel.org, Petr Mladek <pmladek@...e.com>, John
 Ogness <jogness@...utronix.de>
Subject: Re: locking problems in iwlwifi? was Re: 6.16-rcX: crashing way too
 often on thinkpad X220

On Thu, Jul 24 2025 at 15:22, Waiman Long wrote:
> On 7/24/25 3:07 PM, Pavel Machek wrote:
>>> The lockdep warning just means that console_owner_lock is acquired both in
>>> softirq context and in task context with interrupt enabled. That can leads
>>> to deadlock. So the remedy is to always take console_owner_lock with
>>> interrupt disabled, i.e. with
>>> raw_spin_lock_irqsave/raw_spin_lock_irqrestore.
>> So you suspect problem is in the printk code?
>
> This lockdep problem is likely unrelated to the IRQ flag problem 
> reported in the original email as it shouldn't affect the IRQ flag.

Wrong you are ... :)