netdev - Re: That's pretty much it for 3.5.0

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Date:	Tue, 17 Jul 2012 18:48:55 +0000
From:	"Rustad, Mark D" <mark.d.rustad@...el.com>
To:	David Miller <davem@...emloft.net>
CC:	"<netdev@...r.kernel.org>" <netdev@...r.kernel.org>,
	"<linux-wireless@...r.kernel.org>" <linux-wireless@...r.kernel.org>,
	"<netfilter-devel@...r.kernel.org>" <netfilter-devel@...r.kernel.org>
Subject: Re: That's pretty much it for 3.5.0

On Jul 17, 2012, at 10:41 AM, Rustad, Mark D wrote:

> On Jul 17, 2012, at 9:01 AM, David Miller wrote:
> 
>> Linus was _extremely_ generous and took in all the stuff that was
>> pending in the net tree just now.
> 
> Maybe *too* generous. :-) I just updated and when I boot I get an early crash in update_netdev_tables which is in netprio_cgroup.c.
> 
>> Besides very serious issues, I'm not willing to consider any more bug
>> fixes for the 'net' tree at this time.
> 
> I think the above issue will have to be fixed, as it completely prevents booting for any kernel that includes the netprio_cgroup option.
> 
>> Only one pending known bug qualifies, and that's the CIPSO ip option
>> processing OOPS'er.  And I'll work on that myself if Paul Moore
>> doesn't show a sign of life in the next day.
>> 
>> Thanks.
> 
> 
> I can start taking a look at this if you like, but I see that Gao feng has two patches in the last set of patches that may be related.
> 
> To give you an idea how early the crash is, here are a few log messages leading up to it:
> 
> [    0.003455] Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
> [    0.005550] Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
> [    0.007165] Mount-cache hash table entries: 256
> [    0.010289] Initializing cgroup subsys net_cls
> [    0.010947] Initializing cgroup subsys net_prio
> [    0.011039] BUG: unable to handle kernel NULL pointer dereference at 0000000000000828
> [    0.011998] IP: [<ffffffff814202c8>] update_netdev_tables+0x68/0xe0


I found that I can avoid the crash by configuring the netprio_cgroup as a module. I don't need to have it built in, I just happened to. This finding may lower the temperature of this issue a lot from what I had been feeling.

-- 
Mark Rustad, LAN Access Division, Intel Corporation

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