[18w22c] Exception in server tick loop java.lang.OutOfMemoryError: Java heap space

This is a hard one to diagnose. Running without any Xmx flags, Minecraft will use up all available memory and crash, failing to write a crash report.

Setting Xmx to 6GB , The server will again eventually crash. Finally getting a crash report. Seems a little short.

---- Minecraft Crash Report ----
 // You should try our sister game, Minceraft!
Time: 6/3/18 10:10 AM
 Description: Exception in server tick loop
java.lang.OutOfMemoryError: Java heap space
A detailed walkthrough of the error, its code path and all known details is as follows:
 ---------------------------------------------------------------------------------------
– System Details –
 Details:
 Minecraft Version: 18w22c
 Operating System: Windows 8.1 (amd64) version 6.3
 Java Version: 1.8.0_171, Oracle Corporation
 Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
 Memory: 117480000 bytes (112 MB) / 2985295872 bytes (2847 MB) up to 2985295872 bytes (2847 MB)
 JVM Flags: 0 total; 
 Profiler Position: N/A (disabled)
 Player Count: 5 / 100; [so['YT_Veritas0923'/3097547, l='world', x=9975.28, y=49.00, z=15.34], so['AhriEU'/3380965, l='world', x=9908.09, y=62.07, z=1768.95], so['SmaugTheStoner'/3600186, l='world', x=26989.24, y=68.00, z=24952.35], so['Sunshinerose6'/3570624, l='world', x=10005.30, y=60.00, z=21.30], so['CoolReign'/3725904, l='world', x=31023.41, y=64.00, z=-272.25]]
 Data Packs: vanilla, file/veritas0923 (incompatible), file/bac_advancements
 Is Modded: Unknown (can't tell)
 Type: Dedicated Server (map_server.txt)

This is what it looks like in console when it doesn't save a crash report.

[17:25:09] [User Authenticator #43/ERROR]: Caught previously unhandled exception :
[17:25:36] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.OutOfMemoryError: Java heap space
 at bqq.b(SourceFile:154) ~[minecraft_server.18w22c.jar:?]
 at bqv.a(SourceFile:621) ~[minecraft_server.18w22c.jar:?]
 at bqv.a(SourceFile:385) ~[minecraft_server.18w22c.jar:?]
 at bqv.a(SourceFile:216) ~[minecraft_server.18w22c.jar:?]
 at sl.b(SourceFile:217) ~[minecraft_server.18w22c.jar:?]
 at sl.a(SourceFile:237) ~[minecraft_server.18w22c.jar:?]
 at sm.a(SourceFile:737) ~[minecraft_server.18w22c.jar:?]
 at net.minecraft.server.MinecraftServer.a(SourceFile:445) ~[minecraft_server.18w22c.jar:?]
 at net.minecraft.server.MinecraftServer.v(SourceFile:644) ~[minecraft_server.18w22c.jar:?]
 at net.minecraft.server.MinecraftServer.run(SourceFile:531) [minecraft_server.18w22c.jar:?]
 at java.lang.Thread.run(Unknown Source) [?:1.8.0_171]
[17:26:01] [User Authenticator #43/ERROR]: java.lang.OutOfMemoryError: Java heap space
[17:26:03] [File IO Thread/ERROR]: Caught previously unhandled exception :
[17:26:04] [File IO Thread/ERROR]: File IO Thread
java.lang.OutOfMemoryError: Java heap space
 at java.io.BufferedOutputStream.<init>(Unknown Source) ~[?:1.8.0_171]
 at java.io.BufferedOutputStream.<init>(Unknown Source) ~[?:1.8.0_171]
 at bqz.b(SourceFile:225) ~[minecraft_server.18w22c.jar:?]
 at bra.e(SourceFile:119) ~[minecraft_server.18w22c.jar:?]
 at bqv.b(SourceFile:268) ~[minecraft_server.18w22c.jar:?]
 at bqv.a(SourceFile:251) ~[minecraft_server.18w22c.jar:?]
 at cgt.c(SourceFile:42) ~[minecraft_server.18w22c.jar:?]
 at cgt.run(SourceFile:35) ~[minecraft_server.18w22c.jar:?]
 at java.lang.Thread.run(Unknown Source) [?:1.8.0_171]
[17:30:34] [Server thread/ERROR]: Could not save crash report to .\crash-reports\crash-2018-06-02_17.27.24-server.txt
java.lang.OutOfMemoryError: Java heap space
 at java.util.Arrays.copyOfRange(Unknown Source) ~[?:1.8.0_171]
 at java.lang.String.<init>(Unknown Source) ~[?:1.8.0_171]
 at java.lang.StringBuilder.toString(Unknown Source) ~[?:1.8.0_171]
 at b.e(SourceFile:205) ~[minecraft_server.18w22c.jar:?]
 at b.a(SourceFile:223) [minecraft_server.18w22c.jar:?]
 at net.minecraft.server.MinecraftServer.run(SourceFile:554) [minecraft_server.18w22c.jar:?]
 at java.lang.Thread.run(Unknown Source) [?:1.8.0_171]
[17:31:28] [Server thread/ERROR]: We were unable to save this crash report to disk.
[17:31:37] [Server thread/INFO]: Stopping server