Re: [RFC] Strange code in cpu_idle()

[Zwane Mwaikambo]

On Mon, 6 Dec 2004, Michael Buesch wrote:

> Hi Paul,
> 
> Well, your mail is _very_ interresting for me.
> 
> I get this oops for weeks with several kernel versions now:

There shouldn't be any oopses with the changes in question, the original 
bugfix was for crashes whilst unloading ACPI processor or APM module.

> Unable to handle kernel paging request at virtual address 00099108
>  printing eip:
> b01010c0
> *pde = 00000000
> Oops: 0000 [#1]
> SMP 
> Modules linked in: nfs lockd sunrpc nvidia ipv6 ohci_hcd tuner tvaudio msp3400 bttv video_buf firmware_class btcx_risc ehci_hcd uhci_hcd usbcore intel_agp agpgart evdev
> CPU:    0
> EIP:    0060:[<b01010c0>]    Tainted: P      VLI
> EFLAGS: 00010286   (2.6.10-rc2-ck2-nozeroram-findvmastat)

It would be a lot easier to debug with a vanilla kernel and no nvidia 
loaded.

> The above oops shows a crash when we try to access the
> thread_info->flags field. This is done by need_resched()
> to check the TIF_NEED_RESCHED flag.
> I don't know how to interpret the oops correctly to find
> the source of the crash.

Looks like thread_info was. Wow i think you're in a different world of 
hurt. If you can reproduce with less patches and no nvidia please send 
over the bugreport.

Thanks,
	Zwane

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