Proton: Crashing with esync enabled

[ghost]

Phantom Doctrine (UE4) crashes on startup with esync enabled. With it disabled using PROTON_NO_ESYNC in user_settings.py, the game starts up fine. (however there are still some issues)

In terminal while crashing:

eventfd: Too many open files
esync: write: Bad file descriptor
Protocol error: process 0028: sendmsg: Bad file descriptor

[ghost]

Solution: increase systemd DefaultLimitNOFILE as explained here

[Guy1524]

I think that upon installation steam should increase the FD limit.

[kisak-valve]

Hello @DougTy, @Guy1524, increasing FD limits is a privileged operation requiring root permission and most likely will not change any time in the future. This is also documented at https://github.com/ValveSoftware/Proton/blob/proton_3.7/PREREQS.md#fd-limit-requirements.