Re: [crash, bisected] I2C, kobject (ffff81003e8c4160): tried toinit an initialized object
From: Alexey Dobriyan
Date: Thu Jul 17 2008 - 05:51:54 EST
On Thu, Jul 17, 2008 at 11:33:30AM +0200, Ingo Molnar wrote:
> * Ingo Molnar <mingo@xxxxxxx> 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?
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.
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