netdev - [bugreport] stability issue with many altname

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Message-ID: <3e564baf-a1dd-122e-2882-ff143f7eb578@gmail.com>
Date:   Fri, 4 Mar 2022 17:44:46 +0200
From:   George Shuklin <george.shuklin@...il.com>
To:     netdev@...r.kernel.org
Subject: [bugreport] stability issue with many altname

Recently there was a feature in kernel allowing alternative names for 
network interfaces

(https://lwn.net/Articles/794289/)

I decided to give it a try:

while true; do ip link property add altname `uuidgen` dev lo; done

Within 50 seconds I got my machine completely unavailable, and ip start 
to show strange errors on any input:

!!!Deficit 564, rta_len=25954
!!!Deficit 1324, rta_len=0
!!!Deficit 16216, rta_len=25911
!!!Deficit 12288, rta_len=25144
!!!Deficit 2044, rta_len=24884

Moreover, many processes in the system got to 100% cpu use: sudo, 
cups-browser, ovs-vswitchd.

I thing there should be some kind of limit on number of altnames...