ipv6/sit: use DEVSTATSINC() to avoid data-races
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v6.0.16 by commit 4eed93bb3e57b8cc78d17166a14e40a73276015a. For more details please see the references link.