linux-kernel - Re: threshold_init_device/kobject_uevent

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Date:	Fri, 25 Jan 2008 14:50:36 -0800
From:	Greg KH <gregkh@...e.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: threshold_init_device/kobject_uevent_env oops

On Fri, Jan 25, 2008 at 02:47:11PM -0800, Greg KH wrote:
> On Fri, Jan 25, 2008 at 11:35:56PM +0100, Ingo Molnar wrote:
> > 
> > * Greg KH <gregkh@...e.de> wrote:
> > 
> > > On Fri, Jan 25, 2008 at 01:05:40PM -0800, Yinghai Lu wrote:
> > > > current linus tree + x86.git
> > > > 
> > > > got
> > > > 
> > > > Calling initcall 0xffffffff80b93d98: threshold_init_device+0x0/0x3f()
> > > > BUG: unable to handle kernel NULL pointer dereference at 0000000000000040
> > > > IP: [<ffffffff80458e20>] kobject_uevent_env+0x2a/0x3d9
> > > 
> > > Does this happen on just Linus's tree?
> > > 
> > > Can you send me a .config file for this?
> > > 
> > > What is threshold_init()?  Is it something new in the x86.git tree?
> > 
> > no. A quick grep shows that it is in a file that _your_ changes in 
> > Linus' latest have touched:
> > 
> >   arch/x86/kernel/cpu/mcheck/mce_amd_64.c
> 
> Ok, those are pretty much just search/and/replace type changes, but I
> have been running x86-64 boxes with these changes in place.

Oh wait, I do see a change.  We are now (finally) emitting a kobject
uevent for these devices, which somehow the code can't handle properly.

Let me go poke this some more, unfortunatly I don't have any AMD 64
boxes here anymore, only Intel based processors, so I can't run this
module...

thanks,

greg k-h
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