On Thu, 2013-08-22 at 16:30 +0930, Rusty Russell wrote:
> Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> writes:
> > On Wed, Aug 21, 2013 at 05:49:58PM +0800, Li Zhong wrote:
> > > struct kobj_type module_ktype = {
> > > + .release = module_kobj_release,
> > > .sysfs_ops = &module_sysfs_ops,
> > > };
> >
> > Wait, as there is no release function here for the kobject (a different
> > problem), why is the deferred release function causing any problems?
> > There is no release function to call, so what is causing the oops?
>
> Because DEBUG_KOBJECT_RELEASE does the kobject_put() sometime later,
> which is what causes the oops.
>
> Since kobjects don't have an owner field, AFAICT someone *could* grab
> one in a module which is unloading, then put it after unload. So this
> fixes a real bug, albeit not one seen in the real world.
>
> Applied,
Oh, thank you, Rusty.
I just sent out another version... which fix it in another way as Greg
suggested, could you please also help to take a look at it?
Thanks, Zhong
> Rusty.
>
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