Random VPN disconnects with MTE enabled

[gsture]

Is it a bug?

• [X] I know this is an issue with the app, and contacting Mullvad support is not relevant.

I have checked if others have reported this already

• [X] I have checked the issue tracker to see if others have reported similar issues.

Current Behavior

The os randomly says "disconnected from always on VPN" and start blocking connections while the mullvad app still thinks it is connected. The mullvad app notification still says the vpn is connected. It seems like the app is silently crashing and is not aware that the vpn is disconnected. When i press the notification / open the mullvad vpn app the vpn seems to reconnect and the notification goes away.

This seems to happen randomly with MTE (memory tagging extention) enabled. If MTE is disabled this issue does not occur.

Expected Behavior

The vpn should stay connected or reconnect when it's disconnected. It's now like the app is not aware that the vpn is disconnected.

Steps to Reproduce

Install mullvad vpn on pixel 8 with grapheneos and MTE enabled (default) and use phone for a while. Issue happens with both the vpn in main profile and work profile.

Failure Logs

Log 1.txt

Android version

GrapheneOS 14 (AP2A.240705.005)

Device model

2 x Pixel 8 and 1 x Pixel 8a

Mullvad VPN app version

Tested on 2024.2 & 2024.4-beta1

Additional Information

I also reported this to grapheneos but they say it's not an os bug.