BUG: (With Video) UE4 PIE Locks up With 3+ Players (or 2+ Dedicated Server)

Development Programming & Scripting Multiplayer & Networking
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Demonstration Video: Showing issue and steps to recreate.

Issue: UE4 PIE Locks up With 3+ Players (or 2+ Dedicated Server)

System: UE4.18.2 Windows 10 64-bit version 1709 build 16299.125

Quirks:

  • Seems to be related to having an
    Oculus Rift connected (doesn’t happen
    if Rift is disconnected)
  • Doesn’t
    happen on first play attempt.
    Happens on all subsequent attempts
    however.

Reproduce:

  1. Create a new empty blueprint project in 4.18.2
  2. Set number of players to 3 or more.
  3. Press play, hit esc and press play again.

Result:
UE4 editor and all PIE client windows lockup for 30 seconds.

Stack Trace: Screenshot of UE4 stack trace during lockup showing several Oculus related calls resulting in a wait state on a thread.

1680×1010 435 KB

2

Hello tmek,

I was able to reproduce this issue on our end. I have written up a report and I have submitted it to the developers for further consideration. I have provided a link to the public tracker. Please feel free to use the link provided for future updates.

Link: Unreal Engine Issues and Bug Tracker (UE-53748)

Make it a great day