Am Mittwoch, 2. Dezember 2009 09:52:08 schrieb Ondrej Zary: > It shows "prev is NULL, qh=f6581080, ehci->async=f6581000". > > The problem is that activating usbmon causes the problem to disappear. No > errors in maybe 15 attempts. It appeared on 2nd attempt after unloading > usbmon. That suggests a use after free bug, which usbmon prevents holding an additional reference. Are you using SLAB_DEBUG? Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html