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    SubjectRe: EIP is at device_shutdown+0x32/0x60
    On Thu, Nov 15, 2007 at 09:55:34PM +0900, Yasunori Goto wrote:
    > > On Thu, 15 Nov 2007 12:11:58 +0300 Alexey Dobriyan <adobriyan@sw.ru> 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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