Server world hung after killing "Darko" mob floating in Galacticraft oil

[RTHauke]

This is a weird one... I've never run into a bug like this before. Have entire server + world saved to a tarball if anyone would like it to investigate.

I killed a "Darko" mob that was floating in a Galacticraft oil spawn underground. It seemed to have some sort of slowness/gravity effect on it. It would pull you in slowly and broken blocks were attracted to it. Movement/attacks were slowed as well.

After killing said mob, I could not pick up the drops or clear the morph. Turned around and there was another zombie just standing there that I couldn't attack. Restarted server and client and found that items were still there and all mobs are frozen. There was no crash, things just seemed to stop ticking.

At this point I'm calling this world a loss and will reinstall/restart the server from scratch with the newest. I have saved the entire server directory off if you're interested in seeing it. DM me and I'll post it for download someplace if someone wants to take a look at it.

Looked around in logs and didn't see anything but found the following continually repeating in the debug log:

[01:38:29] [Server thread/DEBUG] [FML]: Gathering id map for writing to world save world [01:38:29] [Server thread/DEBUG] [enderio]: Saving ServerChannelRegister with gen=0 [01:38:49] [Server thread/DEBUG] [FML]: The world 4cc61a74 (world) may have leaked: seen 110 times. [01:38:49] [Server thread/DEBUG] [FML]: The world 6b083eac (world) may have leaked: seen 110 times. [01:38:49] [Server thread/DEBUG] [FML]: The world 1e113ffb (world) may have leaked: seen 110 times. [01:38:49] [Server thread/DEBUG] [FML]: The world 97b914 (world) may have leaked: seen 110 times. [01:38:49] [Server thread/DEBUG] [FML]: The world 4fe45df4 (world) may have leaked: seen 110 times.

Server: Linux: Ubuntu 18.04.3 LTS Java: openjdk version "1.8.0_222" MC details: vanilla, no additional plug-ins Server launch settings (settings.sh) export MIN_RAM="1024M" export MAX_RAM="4096M" export JAVA_PARAMETERS="-XX:+UseG1GC -Dsun.rmi.dgc.server.gcInterval=2147483646 -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M -Dfml.readTimeout=180" Server info: AWS t3.large Server Memory: 8GB Server cores: 2 Number of MC clients during issue: 1 Max MC clients: 2

Client Information

• Modpack Version: 3.0.2
• Java Version: openjdk version "1.8.0_212"
• Launcher Used: MultiMC 5 on Linux
• Memory Allocated: 8GB
• Server/LAN/Single Player: Server
• Optifine Installed: No
• Shaders Enabled: No

World Information

• Modpack Version world created in: 3.0.0
• Additional Content Installed: None

Server Information

• Java Version:
• Operating System:
• Hoster/Hosting Solution:
• Sponge (Non-Vanilla Forge) Server:

[minister61]

I have had this issue in 2 single player worlds now and in both it was from killing a "darko" mob with some sort of gravity/pulling. All hostile Minecraft mobs are frozen the rest are still active and can be killed and still drop items and you can pick and can still place blocks without an issue but no blocks can be broken but durability is still used....

Also tried clearing the entities and the item with what ever enchantment it is does not get cleared but everything else does....

I tried going and getting killed and no mobs or anything could kill me... Ended up /kill ing myself and everything went back to normal and is working again. Whatever enchantment that is it's broken.