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: <aIPVghzeOTawpTeT@duo.ucw.cz>
Date: Fri, 25 Jul 2025 21:05:38 +0200
From: Pavel Machek <pavel@....cz>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Waiman Long <llong@...hat.com>,
	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>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>, Tejun Heo <tj@...nel.org>,
	Simona Vetter <simona@...ll.ch>,
	Thierry Reding <thierry.reding@...il.com>
Subject: Re: locking problems in iwlwifi? was Re: 6.16-rcX: crashing way too
 often on thinkpad X220

Hi!

> Enable framebuffer and framebuffer console. Add console=tty0 to the
> kernel command line.
> 
> Log into FB console and do
> 
> #  echo -e '\033[?17;0;64c'
> 
> which enables the software cursor, which in turn enables the above
> conditional invocation of fbcon_del_cursor_work(). Then force a printk
> 
> # echo h >/proc/sysrq-trigger
> 
> and watch the show.

Heh, fun. Yes, long, long time ago I enabled software cursor. I
don't normally use the console these days, but I switched to console
for debugging the wireless problem -- hoping I would catch some kind
of backtrace on the console.

Best regards,
								Pavel

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