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    <title>Mojang Studios Jira</title>
    <link>https://bugs.mojang.com</link>
    <description>This file is an XML representation of an issue</description>
    <language>en</language>    <build-info>
        <version>9.12.2</version>
        <build-number>9120002</build-number>
        <build-date>10-01-2024</build-date>
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<item>
            <title>[MC-11515] Crash - Exception ticking world -&gt; Entity is already tracked!</title>
                <link>https://bugs.mojang.com/browse/MC-11515</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;Crash has occurred four times in two days, and only at high (&amp;gt;200) Y-values.  I am trying to build an iron golem farm.  Upon crash all of my data is saved and I do not lose progress.  I seem to be unable to find a duplicate issue or workaround for this.&lt;/p&gt;

&lt;p&gt;I have not entered The End yet; that issue is unrelated to mine though the error message is similar.&lt;/p&gt;

&lt;p&gt;Thanks for reading.  Good luck.&lt;/p&gt;</description>
                <environment>The following appears to be accurate:&lt;br/&gt;
&lt;br/&gt;
	Minecraft Version: 1.4.7&lt;br/&gt;
	Operating System: Windows 7 (amd64) version 6.1&lt;br/&gt;
	Java Version: 1.7.0_07, Oracle Corporation&lt;br/&gt;
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation&lt;br/&gt;
	Memory: 74684656 bytes (71 MB) / 531628032 bytes (507 MB) up to 954466304 bytes (910 MB)&lt;br/&gt;
	JVM Flags: 2 total; -Xms512m -Xmx1024m&lt;br/&gt;
	AABB Pool Size: 11093 (621208 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used&lt;br/&gt;
	Suspicious classes: No suspicious classes found.&lt;br/&gt;
	IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63&lt;br/&gt;
	Profiler Position: N/A (disabled)&lt;br/&gt;
	Vec3 Pool Size: 5499 (307944 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used&lt;br/&gt;
	Player Count: 1 / 8; [iq[&amp;#39;theothersteve7&amp;#39;/343, l=&amp;#39;Beehive&amp;#39;, x=147.62, y=224.00, z=18.10]]&lt;br/&gt;
	Type: Integrated Server (map_client.txt)&lt;br/&gt;
	Is Modded: Probably not. [Confirming, not modded.] Jar signature remains and both client + server brands are untouched.</environment>
        <key id="25660">MC-11515</key>
            <summary>Crash - Exception ticking world -&gt; Entity is already tracked!</summary>
                <type id="1" iconUrl="https://bugs.mojang.com/secure/viewavatar?size=xsmall&amp;avatarId=18903&amp;avatarType=issuetype">Bug</type>
                                    <status id="5" iconUrl="https://bugs.mojang.com/images/icons/statuses/resolved.png" description="A resolution has been taken, and it is awaiting verification by reporter. From here issues are either reopened, or are closed.">Resolved</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="theothersteve7">Steve Wohlwend</reporter>
                        <labels>
                            <label>crash</label>
                    </labels>
                <created>Sun, 10 Mar 2013 20:10:28 +0100</created>
                <updated>Thu, 7 May 2015 01:46:49 +0200</updated>
                            <resolved>Tue, 19 Mar 2013 23:03:04 +0100</resolved>
                                    <version>Minecraft 1.4.7</version>
                                                                        <votes>1</votes>
                                    <watches>2</watches>
                                                                            <comments>
                            <comment id="55620" author="bljat" created="Tue, 19 Mar 2013 23:03:04 +0100"  >&lt;p&gt;All crashes with &quot;java.lang.IllegalStateException: Entity is already tracked!&quot;&lt;br/&gt;
are collected in &lt;a href=&quot;https://bugs.mojang.com/browse/MC-502&quot; title=&quot;IllegalStateException::Entity is already tracked!&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-502&quot;&gt;&lt;del&gt;MC-502&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="51983" author="kumasasa" created="Tue, 12 Mar 2013 08:07:16 +0100"  >&lt;p&gt;I think the fluctuating entities are the mob spawning / despawning.&lt;br/&gt;
Hostile mobs despawn if you&apos;re 128 blocks away, the mob number falls below the mob cap number, new mobs spawn, despawn, spawn...&lt;/p&gt;

&lt;p&gt;Create a default flatworld, fly up at day over 128 -&amp;gt; no fluctuating entities, fly up at night -&amp;gt; &quot;Goes up and down really fast&quot;&lt;/p&gt;</comment>
                            <comment id="51980" author="kumasasa" created="Tue, 12 Mar 2013 07:54:39 +0100"  >&lt;p&gt;Yes, seeing the fluctuating entities.&lt;/p&gt;

&lt;p&gt;The count is steady while on ground and starts freaking out at around height 180.&lt;/p&gt;

&lt;p&gt;@A.N.: Well, thanks for answering the first half of &lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;What means &lt;em&gt;frantically fluctuates&lt;/em&gt; in numbers ?&lt;/p&gt;&lt;/blockquote&gt;</comment>
                            <comment id="51938" author="theothersteve7" created="Tue, 12 Mar 2013 00:37:21 +0100"  >&lt;p&gt;Alright, still can&apos;t reproduce it in either 1.5 or 1.4.7.  Frustrating.  I&apos;ve duplicated my activities from last night pretty closely and it&apos;s not happening.&lt;/p&gt;

&lt;p&gt;The entity count bounces between 40 and 60, picking a roughly random number in that range each frame.  Try it yourself, just fly up to Y=200 or so and hit F3.&lt;/p&gt;

&lt;p&gt;It has occurred to me that the reason why there&apos;s a similar error from The End is that several Ender Crystal entities, plus the dragon, are generated at high altitude all in one frame when you enter it.  That would potentially make these the same bug.  Of course, at that point I&apos;m making conjectures about obfuscated errors on code I&apos;ve never looked at.&lt;/p&gt;

&lt;p&gt;Anyway, thanks for your consideration.&lt;/p&gt;</comment>
                            <comment id="51932" author="banana478" created="Tue, 12 Mar 2013 00:13:17 +0100"  >&lt;p&gt;Goes up and down really fast&lt;/p&gt;</comment>
                            <comment id="51931" author="kumasasa" created="Tue, 12 Mar 2013 00:10:47 +0100"  >&lt;p&gt;What means &lt;em&gt;frantically fluctuates&lt;/em&gt; in numbers ?&lt;/p&gt;</comment>
                            <comment id="51922" author="theothersteve7" created="Mon, 11 Mar 2013 23:32:21 +0100"  >&lt;p&gt;No crash yet; I&apos;m going to let it run a while.  It&apos;s interesting to note that the total (including unviewed) entity count frantically fluctuates at high altitudes.  That is probably related.&lt;/p&gt;</comment>
                            <comment id="51907" author="theothersteve7" created="Mon, 11 Mar 2013 22:47:54 +0100"  >&lt;p&gt;Thanks Kumasasa.  I hadn&apos;t realized that there were several different errors rolled into that one.  My error does match the third from the bottom, but not the one in the description.  I expected there to be more in common between related stack traces, my mistake.&lt;/p&gt;

&lt;p&gt;The comment by Kenneth Bull seems to be related to mine; all other comments seem to be related to The End.  It&apos;s possible that these two groups the same error, but I don&apos;t really get how you know these are all related.&lt;/p&gt;

&lt;p&gt;I&apos;m going to mess around with duplicating this issue now.  My guess, based on what I&apos;ve seen, is that my error was sometimes triggered when villagers spawned in the golem farm, and his were from squid from the water in his mob trap.&lt;/p&gt;</comment>
                            <comment id="51817" author="bljat" created="Mon, 11 Mar 2013 16:22:43 +0100"  >&lt;p&gt;Please download the 1.5 pre-release from mojang.com, see if the crash happens and attach the crash report here.&lt;/p&gt;</comment>
                            <comment id="51743" author="kumasasa" created="Mon, 11 Mar 2013 07:46:36 +0100"  >&lt;p&gt;Ok reopened. Stracktrace the same, Description different.&lt;/p&gt;

&lt;p&gt;Your:&lt;/p&gt;
&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeHeader panelHeader&quot; style=&quot;border-bottom-width: 1px;&quot;&gt;&lt;b&gt;Minecraft Version: 1.4.7&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;Description: Exception ticking world
java.lang.IllegalStateException: Entity is already tracked!
	at ii.a(SourceFile:69)
	at ii.a(SourceFile:50)
	at ij.a(SourceFile:24)
	at yc.a(SourceFile:842)
&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/browse/MC-502&quot; title=&quot;IllegalStateException::Entity is already tracked!&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-502&quot;&gt;&lt;del&gt;MC-502&lt;/del&gt;&lt;/a&gt;:&lt;/p&gt;
&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeHeader panelHeader&quot; style=&quot;border-bottom-width: 1px;&quot;&gt;&lt;b&gt;Minecraft Version: 1.4.7&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;Description: Ticking entity
java.lang.IllegalStateException: Entity is already tracked!
	at ii.a(SourceFile:69)
	at ii.a(SourceFile:47)
	at ij.a(SourceFile:24)
	at yc.a(SourceFile:842)
&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;</comment>
                            <comment id="51740" author="theothersteve7" created="Mon, 11 Mar 2013 07:07:17 +0100"  >&lt;p&gt;This is not a duplicate.  Please read the description of the error and examine the stack trace.  They have the same error message, but are in completely different parts of the code and are triggered by different conditions.  My description specifically notes this.&lt;/p&gt;</comment>
                            <comment id="51621" author="kumasasa" created="Sun, 10 Mar 2013 20:12:02 +0100"  >&lt;p&gt;Duplicate of &lt;a href=&quot;https://bugs.mojang.com/browse/MC-502&quot; title=&quot;IllegalStateException::Entity is already tracked!&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-502&quot;&gt;&lt;del&gt;MC-502&lt;/del&gt;&lt;/a&gt;, please use the &lt;a href=&quot;https://mojang.atlassian.net/secure/IssueNavigator.jspa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;search function&lt;/a&gt; to see if your bug has already been submitted. Currently &lt;b&gt;over 53%&lt;/b&gt; of tickets are being closed as duplicate.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="11769">MC-502</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="24133" name="crash-2013-03-08_21.55.52-server.txt" size="2942" author="theothersteve7" created="Sun, 10 Mar 2013 20:10:28 +0100"/>
                            <attachment id="24134" name="crash-2013-03-08_23.32.11-server.txt" size="2937" author="theothersteve7" created="Sun, 10 Mar 2013 20:10:28 +0100"/>
                            <attachment id="24135" name="crash-2013-03-09_17.24.52-server.txt" size="3004" author="theothersteve7" created="Sun, 10 Mar 2013 20:10:28 +0100"/>
                            <attachment id="24136" name="crash-2013-03-10_14.52.09-server.txt" size="2958" author="theothersteve7" created="Sun, 10 Mar 2013 20:10:28 +0100"/>
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