Messages in this thread | | | Date | Fri, 05 Dec 2008 17:18:07 -0600 | From | Larry Finger <> | Subject | Re: [PATCH] p54usb: fix usb_kill_urb hang with slub_debug=P |
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Greg KH wrote: > On Fri, Dec 05, 2008 at 03:47:45PM +0100, Christian Lamparter wrote: >> This patch fixes a problem identified by Johannes Berg. > > No, it only papers over the real problem here, let's work on a correct > patch please.
I can contribute a little info. If SLUB debugging is enabled, and the boot command includes 'slub_debug=P', I get a GPF in kref_get(), which is called from kobject_get() with the following code:
if (kobj) kref_get(&kobj->kref);
From the dump, &kobj->kref is 0x6b6b6b6b6b6b6dbb, a poisoned value.
Somewhere, the "struct urb" has been freed, but kobj has not been set to NULL.
As everything I've found is a symptom, I'm still looking for the real cause.
Larry
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