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Fix loop risk in mob spawning around unloaded chunks

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When a mob was about to load a chunk to try to spawn in, we did not
increment the attempt counter, resulting in it being stuck in the mob
spawn loop for a long time and hanging servers.
This commit is contained in:
Aikar 2018-09-15 13:46:01 -04:00
parent 69b80568e9
commit fe975151cb
1 changed files with 8 additions and 5 deletions
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13
Spigot-Server-Patches/Prevent-mob-spawning-from-loading-generating-chunks.patch
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@ -5,7 +5,7 @@ Subject: [PATCH] Prevent mob spawning from loading/generating chunks
diff --git a/src/main/java/net/minecraft/server/SpawnerCreature.java b/src/main/java/net/minecraft/server/SpawnerCreature.java
index 387570ed67..0661ea20d8 100644
index 387570ed67..97ef41fe82 100644
--- a/src/main/java/net/minecraft/server/SpawnerCreature.java
+++ b/src/main/java/net/minecraft/server/SpawnerCreature.java
@@ -0,0 +0,0 @@ public final class SpawnerCreature {
@ -14,15 +14,18 @@ index 387570ed67..0661ea20d8 100644
int k2 = blockposition1.getZ();
- IBlockData iblockdata = worldserver.getType(blockposition1);
+ IBlockData iblockdata = worldserver.getTypeIfLoaded(blockposition1); // Paper - don't load chunks for mob spawn
+ if (iblockdata == null) continue; // Paper - don't load chunks for mob spawn
if (!iblockdata.isOccluding()) {
- if (!iblockdata.isOccluding()) {
+ if (iblockdata != null && !iblockdata.isOccluding()) { // Paper - don't load chunks for mob spawn
int l2 = 0;
int i3 = 0;
@@ -0,0 +0,0 @@ public final class SpawnerCreature {
i4 = biomebase_biomemeta.c + worldserver.random.nextInt(1 + biomebase_biomemeta.d - biomebase_biomemeta.c);
}
if (worldserver.a(enumcreaturetype, biomebase_biomemeta, (BlockPosition) blockposition_mutableblockposition)) {
+ if (!worldserver.isLoaded(blockposition_mutableblockposition)) continue; // Paper - don't load chunks for mob spawn
- if (worldserver.a(enumcreaturetype, biomebase_biomemeta, (BlockPosition) blockposition_mutableblockposition)) {
+ if (worldserver.isLoaded(blockposition_mutableblockposition) && worldserver.a(enumcreaturetype, biomebase_biomemeta, (BlockPosition) blockposition_mutableblockposition)) { // Paper - don't load chunks for mob spawn
EntityPositionTypes.Surface entitypositiontypes_surface = EntityPositionTypes.a(biomebase_biomemeta.b);
if (entitypositiontypes_surface != null && a(entitypositiontypes_surface, worldserver, blockposition_mutableblockposition, biomebase_biomemeta.b)) {
EntityInsentient entityinsentient;