2.6.8.1 hang when adding/removing tc rules

[Martin Pool]

I was experimenting with tc rules on a 2.6.8.1 kernel, adding and
deleting rules on eth0 while traffic was flowing.

After perhaps twenty iterations when I entered this command the
machine hung.  SysRq-b rebooted it.

  sudo tc qdisc add dev eth0 root tbf rate 100kbit latency 50ms burst 1540

This kernel has been very solid in other respects on this machine.

--
Martin
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