Bug#282492: iproute: "ip -4 neigh flush dev eth0" hangs up

[Ernesto Baschny [cron]]

We had a setup with kernel-image-2.6.9-2-k7 2.6.9-5 and iproute 
20010824-8woody1 and the same problem as described. Then we upgraded to 
the latest unstable versions:

kernel-image-2.6.10-1-k7 2.6.10-4
iproute 20041019-2
but still encounter the same problem: "ip -4 neigh flush dev eth0" hangs 
up.

We noticed that it only happens if there are entries in the ARP-Table. 
If the ARP cache is empty, it exits normally saying "Nothing to flush". 
Our ARP-Cache is also being populated very quickly, maybe there is a 
race-condition here?

If we leave the hung ip neigh flush dev eth0 running and in another 
console issue something like:

# for a in `arp -n | awk '/^[0-9]/ { print $1; }'`; do arp -d $a; done
some times in a row (it cleans up all entries in the arp-cache), the 
hung ip command awakes and finishes.


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