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Prevent entity removals if the entity slices is receiving status updates

Browse Source 
If an entity is removed while updating an entity slice, then the
iteration over the entity slice's entities could throw a cryptic
exception. Instead, it is better to prevent the entity removal
with a useful log message.

Fixes https://github.com/PaperMC/Paper/issues/9464
This commit is contained in:
Spottedleaf 2023-07-25 07:11:58 -07:00
parent b14979e352
commit 1837f6c677
1 changed files with 25 additions and 7 deletions
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32
patches/server/0019-Rewrite-chunk-system.patch
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@ -3742,10 +3742,10 @@ index 0000000000000000000000000000000000000000..924539d4ac50c70178ba220424ffacd6
+}
diff --git a/src/main/java/io/papermc/paper/chunk/system/entity/EntityLookup.java b/src/main/java/io/papermc/paper/chunk/system/entity/EntityLookup.java
new file mode 100644
index 0000000000000000000000000000000000000000..41791c7331c80d496cde4e3d1846a178bef0bbe3
index 0000000000000000000000000000000000000000..ff7198a03ab0da79c98513f4a1507e854484f4c2
--- /dev/null
+++ b/src/main/java/io/papermc/paper/chunk/system/entity/EntityLookup.java
@@ -0,0 +1,845 @@
@@ -0,0 +1,859 @@
+package io.papermc.paper.chunk.system.entity;
+
+import com.destroystokyo.paper.util.maplist.EntityList;
@ -4144,6 +4144,17 @@ index 0000000000000000000000000000000000000000..41791c7331c80d496cde4e3d1846a178
+ return true;
+ }
+
+ public boolean canRemoveEntity(final Entity entity) {
+ if (entity.updatingSectionStatus) {
+ return false;
+ }
+
+ final int sectionX = entity.sectionX;
+ final int sectionZ = entity.sectionZ;
+ final ChunkEntitySlices slices = this.getChunk(sectionX, sectionZ);
+ return slices == null || !slices.isPreventingStatusUpdates();
+ }
+
+ private void removeEntity(final Entity entity) {
+ final int sectionX = entity.sectionX;
+ final int sectionY = entity.sectionY;
@ -4157,6 +4168,9 @@ index 0000000000000000000000000000000000000000..41791c7331c80d496cde4e3d1846a178
+ if (slices == null) {
+ LOGGER.warn("Cannot remove entity " + entity + " from null entity slices (" + sectionX + "," + sectionZ + ")");
+ } else {
+ if (slices.isPreventingStatusUpdates()) {
+ throw new IllegalStateException("Attempting to remove entity " + entity + " from entity slices (" + sectionX + "," + sectionZ + ") that is receiving status updates");
+ }
+ if (!slices.removeEntity(entity, sectionY)) {
+ LOGGER.warn("Failed to remove entity " + entity + " from entity slices (" + sectionX + "," + sectionZ + ")");
+ }
@ -16125,10 +16139,10 @@ index d59885ee9c8b29d5bac34dce0597e345e5358c77..f9063e2282f89e97a378f06822cde0a6
}
diff --git a/src/main/java/io/papermc/paper/world/ChunkEntitySlices.java b/src/main/java/io/papermc/paper/world/ChunkEntitySlices.java
new file mode 100644
index 0000000000000000000000000000000000000000..ce449b7b6f615f2c8240e4207f06d4e54ae0083e
index 0000000000000000000000000000000000000000..7e8dc9e8f381abfdcce2746edc93122d623622d1
--- /dev/null
+++ b/src/main/java/io/papermc/paper/world/ChunkEntitySlices.java
@@ -0,0 +1,602 @@
@@ -0,0 +1,606 @@
+package io.papermc.paper.world;
+
+import com.destroystokyo.paper.util.maplist.EntityList;
@ -16307,6 +16321,10 @@ index 0000000000000000000000000000000000000000..ce449b7b6f615f2c8240e4207f06d4e5
+ return ret;
+ }
+
+ public boolean isPreventingStatusUpdates() {
+ return this.preventStatusUpdates;
+ }
+
+ public void stopPreventingStatusUpdates(final boolean prev) {
+ this.preventStatusUpdates = prev;
+ }
@ -20636,7 +20654,7 @@ index 12e72ad737b1219fcdf88d344d41621d9fd5feec..e0bfeebeaac1aaea64bc07cdfdf7790e
if (flag1) {
++this.converted;
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index bbc5ef297b740ab769e8c030e5af6f573259d953..88a84f453c38040933071ea61debcbb196ef10cf 100644
index bbc5ef297b740ab769e8c030e5af6f573259d953..17841455d5afd60eca367591b06e22f69ee23ae4 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -327,6 +327,58 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource {
@ -20748,8 +20766,8 @@ index bbc5ef297b740ab769e8c030e5af6f573259d953..88a84f453c38040933071ea61debcbb1
public final void setRemoved(Entity.RemovalReason reason) {
+ // Paper start - rewrite chunk system
+ io.papermc.paper.util.TickThread.ensureTickThread(this, "Cannot remove entity off-main");
+ if (this.updatingSectionStatus) {
+ LOGGER.warn("Entity " + this + " is currently prevented from being added/removed to world since it is processing section status updates", new Throwable());
+ if (!((ServerLevel)this.level).getEntityLookup().canRemoveEntity(this)) {
+ LOGGER.warn("Entity " + this + " is currently prevented from being removed from the world since it is processing section status updates", new Throwable());
+ return;
+ }
+ // Paper end - rewrite chunk system