linux-kernel - Re: [PATCH v3 00/24] gpio: rework locking and object life-time control

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Date: Fri, 19 Apr 2024 16:27:37 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Jiawen Wu <jiawenwu@...stnetic.com>
Cc: brgl@...ev.pl, bartosz.golaszewski@...aro.org, elder@...aro.org,
	geert+renesas@...der.be, linus.walleij@...aro.org,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	paulmck@...nel.org, warthog618@...il.com, wsa@...-dreams.de
Subject: Re: [PATCH v3 00/24] gpio: rework locking and object life-time
 control

On Fri, Apr 19, 2024 at 03:03:54PM +0800, Jiawen Wu wrote:
> Hi Bartosz Golaszewski,
> 
> I ran into a kernel crash problem when I pull the latest net-next.git, and
> finally it was found that is caused by this patch series merged.

Can you bisect further, i.e. which patch (now a commit message) is the culprit?

> The kernel crashed because I got gpio=0 when I called irq_find_mapping()
> and then struct irq_data *d=null, as my driver describes:
> 
> 	int gpio = irq_find_mapping(gc->irq.domain, hwirq);
> 	struct irq_data *d = irq_get_irq_data(gpio);
> 
> 	txgbe_gpio_irq_ack(d);
> 
> The deeper positioning is this line in __irq_resolve_mapping().
> 
> 	data = rcu_dereference(domain->revmap[hwirq]);
> 		
> So, is it the addition of SRCU infrastructure that causes this issue?

Do you have a full traceback / Oops message to share?

-- 
With Best Regards,
Andy Shevchenko