My initial thought is this is related to running out of disk space; but there's a good 20 minutes between the two events. It's possible the server ran out of space and continued doing its best until this was the bit that finally broke. Or it could be unrelated.
Crash log:
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---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!
Time: 2020-06-08, 5:54 p.m.
Description: Exception ticking world
java.lang.ClassCastException: class FCBlockStone cannot be cast to class alb (FCBlockStone and alb are in unnamed module of loader 'app')
at alc.<init>(SourceFile:33)
at alb.a(BlockRailBase.java:222)
at alb.a(BlockRailBase.java:143)
at abw.a(Chunk.java:624)
at aab.f(World.java:452)
at agw.a(StructureComponent.java:543)
at agw.a(StructureComponent.java:687)
at aen.a(ComponentMineshaftCorridor.java:357)
at agy.a(SourceFile:29)
at ags.a(SourceFile:73)
at acy.a(ChunkProviderGenerate.java:493)
at iy.a(ChunkProviderServer.java:254)
at abw.a(Chunk.java:1122)
at iy.c(ChunkProviderServer.java:158)
at iy.d(ChunkProviderServer.java:171)
at aab.e(World.java:418)
at aan.a(SpawnerAnimals.java:26)
at aan.a(SpawnerAnimals.java:117)
at iz.b(WorldServer.java:144)
at net.minecraft.server.MinecraftServer.r(SourceFile:454)
at hz.r(SourceFile:256)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at alc.<init>(SourceFile:33)
at alb.a(BlockRailBase.java:222)
at alb.a(BlockRailBase.java:143)
at abw.a(Chunk.java:624)
at aab.f(World.java:452)
at agw.a(StructureComponent.java:543)
at agw.a(StructureComponent.java:687)
at aen.a(ComponentMineshaftCorridor.java:357)
at agy.a(SourceFile:29)
at ags.a(SourceFile:73)
at acy.a(ChunkProviderGenerate.java:493)
at iy.a(ChunkProviderServer.java:254)
at abw.a(Chunk.java:1122)
at iy.c(ChunkProviderServer.java:158)
at iy.d(ChunkProviderServer.java:171)
at aab.e(World.java:418)
at aan.a(SpawnerAnimals.java:26)
at aan.a(SpawnerAnimals.java:117)
at iz.b(WorldServer.java:144)
-- Affected level --
Details:
Level name: world
All players: 1 total; [jc['SpeakerGenderbal'/3986, l='world', x=2974.50, y=69.00, z=-4099.42]]
Chunk stats: ServerChunkCache: 1173 Drop: 0
Level seed: -6536461534687196472
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (181,64,-168), Chunk: (at 5,4,8 in 11,-11; contains blocks 176,0,-176 to 191,255,-161), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 103349177 game time, 103349177 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 19580 (now: true), thunder time: 27025 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.r(SourceFile:454)
at hz.r(SourceFile:256)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)
-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Linux (amd64) version 4.15.0-101-generic
Java Version: 11.0.7, Ubuntu
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode, sharing), Ubuntu
Memory: 889307928 bytes (848 MB) / 1075838976 bytes (1026 MB) up to 2147483648 bytes (2048 MB)
JVM Flags: 2 total; -Xmx2048M -Xms1024M
AABB Pool Size: 82 (4592 bytes; 0 MB) allocated, 82 (4592 bytes; 0 MB) used
Suspicious classes: FCBlockFullBlock, FCBlockStone, FCBlockGrass, ...]
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 1 / 30; [jc['SpeakerGenderbal'/3986, l='world', x=2974.50, y=69.00, z=-4099.42]]
Is Modded: Unknown (can't tell)
Type: Dedicated Server (map_server.txt)