Issue with Fabric Networking API

[christopherplaysminecraft]

I've been getting random disconnects from Hypixel for the past week and I cannot seem to find out what's causing those disconnects, they happen every 5 Minutes to 3 Hours for seemingly no reason.

The only error message I'm getting is this:
io.netty.util.IllegalReferenceCountException: refCnt: 0

Looking into the logs gives this, but nothing else
fabricapi-kicks.txt

I remember getting disconnected with a slighty different error
io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1
But I could't find anything in the logs other than that exact message

Minecraft 1.20.4
Fabric-Loader 0.15.3
Fabric-API 0.92.0
Java 21

[modmuss50]

Can you provide the full log for this please, including any mods you are using?

Adding the following JVM option may aid with debugging this issue: -Dio.netty.leakDetection.level=paranoid. Check the game log for anything starting with LEAK:.

[christopherplaysminecraft]

Can you provide the full log for this please

Unfortunately not, because the logs contain some private chats, which would take hours to clear up
Would a log showing the game start help?

including any mods you are using?

I have tested different combinations of those mods, even removing both FAPI and ViaFabricPlus, and I still got disconnected, then I realized NoChatReports uses Fabric Networking API, I don't know if that's relevant though
Haven't been able to test any further (and I would also like to keep NoChatReports)

• Fabric API [0.92.0+1.20.4]
• FerriteCore [6.0.3]
• Sodium [0.5.5]
• ImmediatelyFast [1.2.8+1.20.4]
• ViaFabricPlus [3.0.2]
• No Chat Reports [1.20.4-v2.5.0]
• ModernFix [5.11.1+mc1.20.4]

Adding the following JVM option may aid with debugging this issue
Check the game log for anything starting with LEAK:.

In general or only in cases where I get disconnected? (After having added the JVMarg of couse)

[apple502j]

@christopherplaysminecraft No, please provide logs for the entire gameplay.

[modmuss50]

Can you maybe try wihout ViaFabricPlus and/or No Chat Reports, I expect these mods will make heavy adjustments to the networking stack. Im not sure what some of those peformance mods do either. I think this should be moved to a support disucssion, unless it can be reproduced with just fabric api, or with a minimal mod that shows a bug.

That system prop should force netty to run its leak detection on all packets basically, possibly making it crash more often, or providing extra details in the log.

[github-actions]

👋 We use the issue tracker exclusively for final bug reports and feature requests. However, this issue appears to be better suited for either a discussion thread, or a message on our discord server. Please post your request on one of these, and the conversation can continue there.

[modmuss50]

I have been able to reproduce this issue, in FAPI's dev env.