Szymon Miotk wrote:

> This mail was posted 02-11-2004 to linux-net@vger.kernel.org, but I 
> got no response at all, so I am resending it.
>
> [1.] One line summary of the problem:
> IProute hangs after running traffic shaping scripts

Can you test if this patch helps please ? It immediately removes all
inner qdiscs of classful qdiscs from dev->qdisc_list, making it
impossible for anyone to look up an inner qdisc that is about to get
destroyed. Taking qdisc_tree_lock in qdisc_lookup is not really
necessary with this patch anymore, since all changes to dev->qdisc_list
happen under the rtnl again (which is also relied on for memory). I put
it in anyways for now until I have fully analyzed locking.

Regards
Patrick