Greg KH <gre...@linuxfoundation.org> 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,
Rusty.
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