linux-kernel - Re: 2.6.32-rc8: amd64

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Date:	Mon, 30 Nov 2009 13:29:02 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Borislav Petkov <petkovbb@...glemail.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Doug Thompson <dougthompson@...ssion.com>,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: 2.6.32-rc8: amd64_edac slub error

On Mon, 30 Nov 2009 21:35:47 +0100 Borislav Petkov wrote:

> Hi Randy,
> 
> On Mon, Nov 30, 2009 at 09:28:19AM -0800, Randy Dunlap wrote:
> > Loading amd64_edac_mod on an amd64 system without the expected hardware support
> > causes memory usage error(s).
> 
> Well, this is new!
> 
> > Is this already fixed/patched?  Do you need more info?
> 
> Nope :(.
> 
> I've tried to reproduce it here by selecting CONFIG_SLUB no success.
> Please send me your config.

attached (after enabling EDAC_DEBUG).

> Also, it would be very helpful if you could enable CONFIG_EDAC_DEBUG and
> run it again.

doing that now.

> From looking at the error trace, though, it looks like we're
> not allocating enough memory for the struct msr things in
> amd64_nb_mce_bank_enabled_on_node(). This is just a hunch though and you
> could give the following debug patch a try:

and that.


> ---
> diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
> index a38831c..139bc14 100644
> --- a/drivers/edac/amd64_edac.c
> +++ b/drivers/edac/amd64_edac.c
> @@ -2739,8 +2739,10 @@ static void get_cpus_on_this_dct_cpumask(cpumask_t *mask, int nid)
>  	int cpu;
>  
>  	for_each_online_cpu(cpu)
> -		if (amd_get_nb_id(cpu) == nid)
> +		if (amd_get_nb_id(cpu) == nid) {
> +			pr_err("%s: nid: %d, cpu: %d\n", __func__, nid, cpu);
>  			cpumask_set_cpu(cpu, mask);
> +		}
>  }
>  
>  /* check MCG_CTL on all the cpus on this node */
> @@ -2755,6 +2757,8 @@ static bool amd64_nb_mce_bank_enabled_on_node(int nid)
>  
>  	get_cpus_on_this_dct_cpumask(&mask, nid);
>  
> +	pr_err("%s: weight: %d\n", __func__, cpumask_weight(&mask));
> +
>  	msrs = kzalloc(sizeof(struct msr) * cpumask_weight(&mask), GFP_KERNEL);
>  	if (!msrs) {
>  		amd64_printk(KERN_WARNING, "%s: error allocating msrs\n",
> 
> --
> 
> PS. I'm travelling till the end of the week and won't have constant
> access to mail but I'll do my best to fix this, sorry.
> 
> Thanks.
> 
> -- 
> Regards/Gruss,
>     Boris.


---
~Randy

Download attachment "config-amd64-edac" of type "application/octet-stream" (100793 bytes)