Race condition/no locking on configuration load

caskd caskd at redxen.eu
Sun Apr 2 12:54:12 UTC 2023

Hello everyone,

i've hit a weird edgecase where the wireguard config gets loaded and during the load the interface gets a address assigned which just disappears. Here's how i replicate it.

ip link add $IFNAME type wireguard
wg setconf $IFNAME $CONFIG #-- while this runs, run the command below in parallel
ip -6 address add $ADDR dev $IFNAME

Following this, the added interface address doesn't persist, yet no error is returned by either iproute2 or wireguard-tools.

iproute2 6.2.0
Linux 6.1.9
wireguard-tools 1.0.20210914

Is this a known problem? I assume it has to do with no locking being done or similar but i haven't looked deeper into it.

Alex D.
RedXen System & Infrastructure Administration
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