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Protect the visible chunk map from plugins touching it, trim Timing Errors

Blow up if a plugin tries to mutate visibleChunks directly and prevent them
from doing so.

Also provide a safe get call if any plugins directly call get on it so
that it uses the special logic to check pending.

Also restores ABI for the visibleChunks field back to what it was too.

Additionally, remove the stack trace from Timings Stack Corruption for any
error thrown on Minecraft Timings, and tell them to get the error ABOVE this
instead, so people stop giving us useless error reports.

Also fixes a memory leak when the source map down sizes but dest map didn't,
which resulted in lingering references to old chunk holders.

Fixes 
This commit is contained in:
Aikar 2020-05-20 22:22:47 -04:00
parent d4d21be955
commit 690f01f604
2 changed files with 46 additions and 17 deletions

View file

@ -608,13 +608,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ TimingHandler last;
+ while ((last = TIMING_STACK.removeLast()) != this) {
+ last.timingDepth = 0;
+ String reportTo;
+ if ("Minecraft".equalsIgnoreCase(last.identifier.group)) {
+ reportTo = "Paper! This is a potential bug in Paper";
+ Logger.getGlobal().log(Level.SEVERE, "TIMING_STACK_CORRUPTION - Look above this for any errors and report this to Paper unless it has a plugin in the stack trace (" + last.identifier + " did not stopTiming)");
+ } else {
+ reportTo = "the plugin " + last.identifier.group + "(Look for errors above this in the logs)";
+ Logger.getGlobal().log(Level.SEVERE, "TIMING_STACK_CORRUPTION - Report this to the plugin " + last.identifier.group + " (Look for errors above this in the logs) (" + last.identifier + " did not stopTiming)", new Throwable());
+ }
+ Logger.getGlobal().log(Level.SEVERE, "TIMING_STACK_CORRUPTION - Report this to " + reportTo + " (" + last.identifier + " did not stopTiming)", new Throwable());
+
+ boolean found = TIMING_STACK.contains(this);
+ if (!found) {
+ // We aren't even in the stack... Don't pop everything

View file

@ -24,16 +24,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+public class Long2ObjectLinkedOpenHashMapFastCopy<V> extends Long2ObjectLinkedOpenHashMap<V> {
+
+ public void copyFrom(Long2ObjectLinkedOpenHashMapFastCopy<V> map) {
+ if (key.length < map.key.length) {
+ if (key.length != map.key.length) {
+ key = null;
+ key = new long[map.key.length];
+ }
+ if (value.length < map.value.length) {
+ if (value.length != map.value.length) {
+ value = null;
+ //noinspection unchecked
+ value = (V[]) new Object[map.value.length];
+ }
+ if (link.length < map.link.length) {
+ if (link.length != map.link.length) {
+ link = null;
+ link = new long[map.link.length];
+ }
@ -48,6 +48,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ this.maxFill = map.maxFill;
+ this.containsNullKey = map.containsNullKey;
+ }
+
+ @Override
+ public Long2ObjectLinkedOpenHashMapFastCopy<V> clone() {
+ Long2ObjectLinkedOpenHashMapFastCopy<V> clone = (Long2ObjectLinkedOpenHashMapFastCopy<V>) super.clone();
+ clone.copyFrom(this);
+ return clone;
+ }
+}
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
@ -85,10 +92,33 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
public static final int GOLDEN_TICKET = 33 + ChunkStatus.b();
- public final Long2ObjectLinkedOpenHashMap<PlayerChunk> updatingChunks = new Long2ObjectLinkedOpenHashMap();
- public volatile Long2ObjectLinkedOpenHashMap<PlayerChunk> visibleChunks;
+ public final com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk> updatingChunks = new com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<>(); // Paper - faster copying
+ public final com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk> visibleChunks = new com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<>(); // Paper - faster copying
+ public final com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk> pendingVisibleChunks = new com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<>(); // Paper - this is used if the visible chunks is updated while iterating only
+ public transient Long2ObjectLinkedOpenHashMap<PlayerChunk> visibleChunksClone; // Paper - used for async access of visible chunks, clone and cache only when needed
+ // Paper start - faster copying
+ public final Long2ObjectLinkedOpenHashMap<PlayerChunk> updatingChunks = new com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<>(); // Paper - faster copying
+ public final Long2ObjectLinkedOpenHashMap<PlayerChunk> visibleChunks = new ProtectedVisibleChunksMap(); // Paper - faster copying
+
+ private class ProtectedVisibleChunksMap extends com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk> {
+ @Override
+ public PlayerChunk put(long k, PlayerChunk playerChunk) {
+ throw new UnsupportedOperationException("Updating visible Chunks");
+ }
+
+ @Override
+ public PlayerChunk remove(long k) {
+ throw new UnsupportedOperationException("Removing visible Chunks");
+ }
+
+ @Override
+ public PlayerChunk get(long k) {
+ return PlayerChunkMap.this.getVisibleChunk(k);
+ }
+
+ public PlayerChunk safeGet(long k) {
+ return super.get(k);
+ }
+ }
+ // Paper end
+ public final com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk> pendingVisibleChunks = new com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk>(); // Paper - this is used if the visible chunks is updated while iterating only
+ public transient com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk> visibleChunksClone; // Paper - used for async access of visible chunks, clone and cache only when needed
private final Long2ObjectLinkedOpenHashMap<PlayerChunk> pendingUnload;
final LongSet loadedChunks; // Paper - private -> package
public final WorldServer world;
@ -120,7 +150,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ } finally {
+ this.isIterating = prev;
+ if (!this.isIterating && this.hasPendingVisibleUpdate) {
+ this.visibleChunks.copyFrom(this.pendingVisibleChunks);
+ ((ProtectedVisibleChunksMap)this.visibleChunks).copyFrom(this.pendingVisibleChunks);
+ this.pendingVisibleChunks.clear();
+ this.hasPendingVisibleUpdate = false;
+ }
@ -133,7 +163,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ synchronized (this.visibleChunks) {
+ if (DEBUG_ASYNC_VISIBLE_CHUNKS) new Throwable("Async getVisibleChunks").printStackTrace();
+ if (this.visibleChunksClone == null) {
+ this.visibleChunksClone = this.hasPendingVisibleUpdate ? this.pendingVisibleChunks.clone() : this.visibleChunks.clone();
+ this.visibleChunksClone = this.hasPendingVisibleUpdate ? this.pendingVisibleChunks.clone() : ((ProtectedVisibleChunksMap)this.visibleChunks).clone();
+ }
+ return this.visibleChunksClone;
+ }
@ -147,10 +177,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ // Paper start - mt safe get
+ if (Thread.currentThread() != this.world.serverThread) {
+ synchronized (this.visibleChunks) {
+ return (PlayerChunk) (this.hasPendingVisibleUpdate ? this.pendingVisibleChunks.get(i) : this.visibleChunks.get(i));
+ return (PlayerChunk) (this.hasPendingVisibleUpdate ? this.pendingVisibleChunks.get(i) : ((ProtectedVisibleChunksMap)this.visibleChunks).safeGet(i));
+ }
+ }
+ return (PlayerChunk) (this.hasPendingVisibleUpdate ? this.pendingVisibleChunks.get(i) : this.visibleChunks.get(i));
+ return (PlayerChunk) (this.hasPendingVisibleUpdate ? this.pendingVisibleChunks.get(i) : ((ProtectedVisibleChunksMap)this.visibleChunks).safeGet(i));
+ // Paper end
}
@ -184,11 +214,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ synchronized (this.visibleChunks) {
+ if (isIterating) {
+ hasPendingVisibleUpdate = true;
+ this.pendingVisibleChunks.copyFrom(this.updatingChunks);
+ this.pendingVisibleChunks.copyFrom((com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk>)this.updatingChunks);
+ } else {
+ hasPendingVisibleUpdate = false;
+ this.pendingVisibleChunks.clear();
+ this.visibleChunks.copyFrom(this.updatingChunks);
+ ((ProtectedVisibleChunksMap)this.visibleChunks).copyFrom((com.destroystokyo.paper.util.map.Long2ObjectLinkedOpenHashMapFastCopy<PlayerChunk>)this.updatingChunks);
+ this.visibleChunksClone = null;
+ }
+ }