On Thu, Nov 15, 2007 at 09:55:34PM +0900, Yasunori Goto wrote:
> > On Thu, 15 Nov 2007 12:11:58 +0300 Alexey Dobriyan <[email protected]> wrote:
> >
> > > Three boxes rarely oops during reboot or poweroff with 2.6.24-rc2-mm1
> > > (1) and during 2.6.24 cycle (2):
> > >
> > > kernel_restart
> > > sys_reboot
> > > [garbage]
> > > Code: 8b 88 a8 00 00 00 85 c9 74 04 89
> > > EIP is at device_shutdown+0x32/0x60
> >
> > Yes, all my test boxes did that - it's what I referred to in the releaee
> > notes. Greg is pondering the problem - seem he's the only person who
> > cannot reproduce it ;)
>
> Fortunately, my ia64 box reproduces this oops "every time".
> So, I could chase it.
>
> device_shutdown() function in drivers/base/power/shutdown.c
> is followings.
> -----------
> /**
> * device_shutdown - call ->shutdown() on each device to shutdown.
> */
> void device_shutdown(void)
> {
> struct device * dev, *devn;
>
> list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list,
> kobj.entry) {
> if (dev->bus && dev->bus->shutdown) {
> dev_dbg(dev, "shutdown\n");
> dev->bus->shutdown(dev);
> } else if (dev->driver && dev->driver->shutdown) {
> dev_dbg(dev, "shutdown\n");
> dev->driver->shutdown(dev);
> }
> }
> }
> --------
> When oops occured, dev->driver pointed kset_ktype's address,
> and dev->driver->shutdown was the address of bus_type_list.
> So, Oops was caused by "Illegal operation fault".
> kset_ktypes is pointed by system_kset.
>
> If my understanding is correct, this loop can't distinguish between
> struct device and struct kset, but both are connected in this list,
> right? It may be the cause of this.
Hm, no, it should just be a list of devices for the kset, but I'll go
verify that this is correct.
And yeah, I can duplicate this problem here too...
thanks,
greg k-h
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