Am Donnerstag, 26. April 2012, 15:41:15 schrieb Bjørn Mork: > Note that there is a significant delay (several seconds - up to a > minute) before the actual lockup. Unloading the cdc-wdm driver during > this stage does not prevent the bug, and does not cause any immediate > crash either. So I believe this must be related to data living in the > usb subsystem? Do we free a buffer referenced by an URB? > > > And could you provide an oops? > > A couple of the samples. Using qmi_wwan with cdc-wdm as a subdriver: > > [ 449.521234] qmi_wwan 5-4:1.8: Tx URB has been submitted index=8 from wdm_write() This means that set_bit(WDM_IN_USE, &desc->flags) has been executed > [ 449.523575] qmi_wwan 5-4:1.8: wdm_release: cleanup wdm_release() so wdm_flush() also has run. It will put itself on the waitqueue. Very bad if disconnect() has freed the memory. Please put in the printks 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
