Re: [RFC] Strange code in cpu_idle()

[Michael Buesch <mbuesch@freenet.de>]

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Quoting Zwane Mwaikambo <zwane@arm.linux.org.uk>:
> 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.

Yes. That's the problem.
It's impossible to reproduce and it's pure luck when it's triggered.
I'll look what I can do. nvidia already received this bugreport.

> Thanks,
>  Zwane
> 
> 
> 

-- 
Regards Michael Buesch  [ http://www.tuxsoft.de.vu ]



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