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Prevent entity removals if the entity slices is receiving status updates

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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
Dieser Commit ist enthalten in:
Spottedleaf 2023-07-25 07:11:58 -07:00
Ursprung b14979e352
Commit 1837f6c677
1 geänderte Dateien mit 25 neuen und 7 gelöschten Zeilen
Statistiken anzeigen Patch-Datei herunterladen Vergleichs-Datei herunterladen Alle Dateien ausklappen Alle Dateien einklappen

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