linux-kernel - Re: kobject (ffff88003ffbb4b8): tried to init an initialized object, something is seriously wrong.

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Message-ID: <20120206182040.GA1862@phenom.dumpdata.com>
Date:	Mon, 6 Feb 2012 13:20:40 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: kobject (ffff88003ffbb4b8): tried to init an initialized object,
 something is seriously wrong.

On Fri, Feb 03, 2012 at 01:42:35PM -0800, Greg KH wrote:
> On Fri, Feb 03, 2012 at 01:39:49PM -0800, Greg KH wrote:
> > On Fri, Feb 03, 2012 at 03:59:53PM -0500, Konrad Rzeszutek Wilk wrote:
> > > Hey Greg,
> > > 
> > > With or without your previous patch (the one that added an cpu_device_release
> > > function) I am getting this in 3.3-rc2.  I did not get this in 3.2.
> > > 
> > > I added some extra printks to make sure that the handle_vcpu_hotplug_event
> > > code actually did call 'arch_unregister_cpu' which is certainly looks
> > > to be doing.
> > > 
> > > I hadn't done a bisection yet, but was wondering if this is related
> > > to the previous issues with the sysdev. Or kobject getting more observant.
> > 
> > No, it's related to the previous issue, let me knock up a patch to fix
> > this as well...
> 
> Does this patch solve the problem for you?

Yeah, no warnings. But neither is the CPU coming back up :-(

Thought that might be related to something else  - let me double check
with 3.2 whether there are some race-conditions that I might be hitting.

> 
> thanks,
> 
> greg k-h
> 
> diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
> index 23f2c4c..4dabf50 100644
> --- a/drivers/base/cpu.c
> +++ b/drivers/base/cpu.c
> @@ -240,6 +240,7 @@ int __cpuinit register_cpu(struct cpu *cpu, int num)
>  	int error;
>  
>  	cpu->node_id = cpu_to_node(num);
> +	memset(&cpu->dev, 0x00, sizeof(struct device));
>  	cpu->dev.id = num;
>  	cpu->dev.bus = &cpu_subsys;
>  	cpu->dev.release = cpu_device_release;
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