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From: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
To: Alexey Dobriyan <adobriyan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: john stultz <johnstul-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>,
	Greg KH <gregkh-l3A5Bk7waGM@public.gmane.org>,
	LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Linux I2C <i2c-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org>,
	Ulrich Drepper <drepper-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: [crash, bisected] I2C, kobject (ffff81003e8c4160): tried to	init an initialized object
Date: Thu, 17 Jul 2008 11:59:44 +0200	[thread overview]
Message-ID: <20080717095944.GA2097@elte.hu> (raw)
In-Reply-To: <20080717094858.GA18687-QDJVlCTZ4KWTKS93B3g+7KFoa47nwP16@public.gmane.org>


* Alexey Dobriyan <adobriyan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> On Thu, Jul 17, 2008 at 11:33:30AM +0200, Ingo Molnar wrote:
> > 
> > * Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org> wrote:
> > 
> > > Jean,
> > > 
> > > -tip testing found another (similar) i2c crash with latest -git, on a 
> > > Core2Duo laptop:
> > > 
> > > calling  nforce2_init+0x0/0x1b
> > > initcall nforce2_init+0x0/0x1b returned 0 after 0 msecs
> > > calling  nforce2_s4985_init+0x0/0x275
> > > BUG: unable to handle kernel NULL pointer dereference at 0000000c
> > > IP: [<c04af2cf>] i2c_smbus_xfer+0x27/0x3f0
> > > *pdpt = 00000000009cb001 *pde = 0000000000000000 
> > > Oops: 0000 [#1] SMP 
> > 
> > turning off I2C_NFORCE2_S4985 makes the system boot up fine. Workaround 
> > patch below.
> 
> Well, it's pretty easy oops unless I misread something.
> It happened on not nforce2 motherboard, right?

yeah.

> nforce2_init will just register PCI driver,
> no matching PCI ids => nforce2_set_reference() isn't called =>
> nforce2_smbus stays NULL.
> 
> Second module loads and tries to i2c_smbus_xfer(NULL, ) in module_init()
> hook which oopses.

can try patches, but got other 5 fresh upstream oopses/hangs/crashes to 
investigate now. (so i went for the minimal-effort 
turn-off-the-failing-part approach)

	Ingo

_______________________________________________
i2c mailing list
i2c-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org
http://lists.lm-sensors.org/mailman/listinfo/i2c

WARNING: multiple messages have this Message-ID (diff)
From: Ingo Molnar <mingo@elte.hu>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Jean Delvare <khali@linux-fr.org>,
	john stultz <johnstul@us.ibm.com>, Greg KH <gregkh@suse.de>,
	LKML <linux-kernel@vger.kernel.org>,
	Linux I2C <i2c@lm-sensors.org>,
	Ulrich Drepper <drepper@redhat.com>
Subject: Re: [crash, bisected] I2C,  kobject (ffff81003e8c4160): tried to init an initialized object
Date: Thu, 17 Jul 2008 11:59:44 +0200	[thread overview]
Message-ID: <20080717095944.GA2097@elte.hu> (raw)
In-Reply-To: <20080717094858.GA18687@martell.zuzino.mipt.ru>


* Alexey Dobriyan <adobriyan@gmail.com> wrote:

> On Thu, Jul 17, 2008 at 11:33:30AM +0200, Ingo Molnar wrote:
> > 
> > * Ingo Molnar <mingo@elte.hu> wrote:
> > 
> > > Jean,
> > > 
> > > -tip testing found another (similar) i2c crash with latest -git, on a 
> > > Core2Duo laptop:
> > > 
> > > calling  nforce2_init+0x0/0x1b
> > > initcall nforce2_init+0x0/0x1b returned 0 after 0 msecs
> > > calling  nforce2_s4985_init+0x0/0x275
> > > BUG: unable to handle kernel NULL pointer dereference at 0000000c
> > > IP: [<c04af2cf>] i2c_smbus_xfer+0x27/0x3f0
> > > *pdpt = 00000000009cb001 *pde = 0000000000000000 
> > > Oops: 0000 [#1] SMP 
> > 
> > turning off I2C_NFORCE2_S4985 makes the system boot up fine. Workaround 
> > patch below.
> 
> Well, it's pretty easy oops unless I misread something.
> It happened on not nforce2 motherboard, right?

yeah.

> nforce2_init will just register PCI driver,
> no matching PCI ids => nforce2_set_reference() isn't called =>
> nforce2_smbus stays NULL.
> 
> Second module loads and tries to i2c_smbus_xfer(NULL, ) in module_init()
> hook which oopses.

can try patches, but got other 5 fresh upstream oopses/hangs/crashes to 
investigate now. (so i went for the minimal-effort 
turn-off-the-failing-part approach)

	Ingo

  parent reply	other threads:[~2008-07-17  9:59 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-07-14 20:49 [GIT PULL] i2c updates for 2.6.27, round 1 Jean Delvare
2008-07-14 20:49 ` Jean Delvare
2008-07-16  8:23 ` [crash, bisected] I2C, kobject (ffff81003e8c4160): tried to init an initialized object (was: Re: [GIT PULL] i2c updates for 2.6.27, round 1) Ingo Molnar
2008-07-16  9:07   ` Jean Delvare
2008-07-16  9:07     ` Jean Delvare
2008-07-16 10:08     ` [crash, bisected] I2C, kobject (ffff81003e8c4160): tried to init an initialized object Jean Delvare
2008-07-16 12:18       ` Jean Delvare
2008-07-17  9:26         ` Ingo Molnar
2008-07-17  9:33           ` Ingo Molnar
2008-07-17  9:48             ` Alexey Dobriyan
     [not found]               ` <20080717094858.GA18687-QDJVlCTZ4KWTKS93B3g+7KFoa47nwP16@public.gmane.org>
2008-07-17  9:59                 ` Ingo Molnar [this message]
2008-07-17  9:59                   ` Ingo Molnar
2008-08-06 20:21               ` Jean Delvare
2008-08-06 20:21                 ` Jean Delvare
     [not found]           ` <20080717092655.GA6115-X9Un+BFzKDI@public.gmane.org>
2008-07-17  9:49             ` Ingo Molnar
2008-07-17  9:49               ` Ingo Molnar
2008-07-17  9:54               ` Ingo Molnar
2008-07-17 22:42     ` [crash, bisected] I2C, kobject (ffff81003e8c4160): tried to init an initialized object (was: Re: [GIT PULL] i2c updates for 2.6.27, round 1) Greg KH

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