On Di, 2014-05-27 at 08:28 +0000, Gonglei (Arei) wrote:
> Hi,
> 
> Those day, I'm working for usb controller hot-plugging/unplugging(
> not enable multifunction capability). Everything work well, but when 
> I test the case of hot-plug/unplug reiteratively, qemu will be aborted:

Guess you've removed the "dc->hotpluggable = false" and added a cleanup
function?

> I don't know why the new qdict address will conflict with the global usb 
> busses. tqh_last?

Most likely something is missing in the cleanup, leading to a
use-after-free.

Usually Electric Fence is pretty good at catching them.
http://www.pf-lug.de/projekte/haya/efence.php

cheers,
  Gerd


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