linux-kernel - Re: problem with starting 2.6.25-rc1 and latest git

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Date:	Sun, 2 Mar 2008 22:09:21 +0100
From:	Mariusz Kozlowski <m.kozlowski@...land.pl>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: problem with starting 2.6.25-rc1 and latest git

Hello Jean,

> On Tue, 26 Feb 2008 17:04:46 +0100, Mariusz Kozlowski wrote:
> > I can reproduce this here on rc3 as well. Weird - on git tree before
> > rc3 was released this didn't happen. rc2 and rc1 are broken. I also
> > don't know why nobody else see this but us :) And not sure how
> > to debug it some more or provide more accurate information.
> 
> Here's a quick and dirty debugging patch I wrote in an attempt to find
> out what was going on. Unfortunately, the problem never happened to me
> when this debug patch was applied. Maybe you'll have more "luck"?

Sorry for the late response. I tried your patch and it seems we share this 'luck'.
I couldn't reproduce that. I have a few other ideas to try. I'll see what I can do. 
Unfortunately my time got limited recently so I'm lagging behind LKML and
kernel stuff :-/

	Mariusz

>  kernel/module.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> --- linux-2.6.25-rc1.orig/kernel/module.c	2008-02-14 09:16:15.000000000 +0100
> +++ linux-2.6.25-rc1/kernel/module.c	2008-02-14 23:20:22.000000000 +0100
> @@ -2153,8 +2153,10 @@ sys_init_module(void __user *umod,
>  		return PTR_ERR(mod);
>  	}
>  
> +	printk(KERN_WARNING "loading module %s, checkpoint 1\n", mod->name);
>  	/* Drop lock so they can recurse */
>  	mutex_unlock(&module_mutex);
> +	printk(KERN_WARNING "loading module %s, checkpoint 2\n", mod->name);
>  
>  	blocking_notifier_call_chain(&module_notify_list,
>  			MODULE_STATE_COMING, mod);
> @@ -2177,6 +2179,7 @@ sys_init_module(void __user *umod,
>  
>  	/* Now it's a first class citizen! */
>  	mutex_lock(&module_mutex);
> +	printk(KERN_WARNING "loading module %s, checkpoint 3\n", mod->name);
>  	mod->state = MODULE_STATE_LIVE;
>  	/* Drop initial reference. */
>  	module_put(mod);
> @@ -2186,6 +2189,7 @@ sys_init_module(void __user *umod,
>  	mod->init_size = 0;
>  	mod->init_text_size = 0;
>  	mutex_unlock(&module_mutex);
> +	printk(KERN_WARNING "loading module %s, checkpoint 4\n", mod->name);
>  	wake_up(&module_wq);
>  
>  	return 0;
> 
> 


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