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<channel>
    <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>
    </build-info>


<item>
            <title>[MC-11571] Huge lighting updates lag the game.</title>
                <link>https://bugs.mojang.com/browse/MC-11571</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;&#160;&lt;b&gt;The bug&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;This bug causes alot of light updates, dropping your FPS to 0 and most likely crashing your game.&lt;/p&gt;

&lt;p&gt;This has been used for around a year now on&#160;several servers, this causes players to crash their game.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;How to reproduce&lt;/b&gt;&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Create a new world (superflat, cheats on)&lt;/li&gt;
	&lt;li&gt;Execute command: /fill ~20 ~200 ~-20 ~-20 ~200 ~20 stone&lt;/li&gt;
	&lt;li&gt;Teleport yourself up to the platform. (/tp @a ~ ~205 ~)&lt;/li&gt;
	&lt;li&gt;Place 2 observers facing into each other, make a hole 1 block away from the observer. (See screenshot for setup. the observers is to make a repeating redstone clock)&lt;/li&gt;
	&lt;li&gt;Just place the piston so it pulls the block over the hole.&lt;/li&gt;
	&lt;li&gt;Prepare yourself to see your FPS drop to 0.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;&lt;b&gt;Code analysis&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;The following is based on a decompiled version of Minecraft 1.12 using MCP940.&lt;/p&gt;

&lt;p&gt;In the method &lt;sub&gt;net.minecraft.world.chunk.setBlockState()&lt;/sub&gt; you have this~~&lt;/p&gt;
&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;&lt;span class=&quot;code-keyword&quot;&gt;if&lt;/span&gt; (j &amp;gt;= i1)
{
&lt;span class=&quot;code-keyword&quot;&gt;this&lt;/span&gt;.relightBlock(i, j + 1, k);
}
&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;which relight blocks, but this is causing the massive FPS drops. What this does is, if &lt;b&gt;j&lt;/b&gt; (posY) is bigger then &lt;b&gt;i1&lt;/b&gt;, it will relight the block on the X, Y + 1, Z the player is.&lt;/p&gt;

&lt;p&gt;If you remove the &apos;+ 1&apos; this issue will be fixed. idk why though.&lt;/p&gt;
&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;&lt;span class=&quot;code-keyword&quot;&gt;if&lt;/span&gt; (j &amp;gt;= i1) 
{ 
&lt;span class=&quot;code-keyword&quot;&gt;this&lt;/span&gt;.relightBlock(i, j, k); 
}
&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;----------------------------------------------------------------------&lt;/p&gt;

&lt;p&gt;When making a Creative world with bedrock at the bottom, air for most, and bedrock at the top, when you break the bedrock the game lags for about 7 seconds.&lt;/p&gt;

&lt;p&gt;Example superflat preset: &lt;tt&gt;3;minecraft:bedrock,250*minecraft:air,minecraft:bedrock;1;&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;I made a program that will take the &quot;Something&apos;s taking too long!&quot; messages and put it in a list. In the attached list, you can see that root.tick.level.connection is taking a VERY long time.&lt;/p&gt;

&lt;p&gt;I hope this gets fixed soon, because it can be a huge exploit on servers.&lt;/p&gt;

&lt;p&gt;^ original report&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="25727">MC-11571</key>
            <summary>Huge lighting updates lag the game.</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="1">Fixed</resolution>
                                        <assignee username="fry">[Mojang] Georgii Gavrichev</assignee>
                                    <reporter username="Oval">Oval</reporter>
                        <labels>
                            <label>fps</label>
                            <label>freeze</label>
                            <label>lag</label>
                            <label>light</label>
                            <label>lighting</label>
                            <label>lockup</label>
                    </labels>
                <created>Mon, 11 Mar 2013 20:46:28 +0100</created>
                <updated>Mon, 6 May 2019 13:22:49 +0200</updated>
                            <resolved>Tue, 23 Oct 2018 18:57:08 +0200</resolved>
                                    <version>Minecraft 1.4.7</version>
                    <version>Snapshot 13w10b</version>
                    <version>Minecraft 1.5</version>
                    <version>Minecraft 1.8</version>
                    <version>Minecraft 1.8.1-pre2</version>
                    <version>Minecraft 1.8.1</version>
                    <version>Minecraft 1.8.2-pre4</version>
                    <version>Minecraft 1.8.8</version>
                    <version>Minecraft 15w44b</version>
                    <version>Minecraft 15w46a</version>
                    <version>Minecraft 1.8.9</version>
                    <version>Minecraft 15w51b</version>
                    <version>Minecraft 1.9.2</version>
                    <version>Minecraft 1.9.4</version>
                    <version>Minecraft 1.10.2</version>
                    <version>Minecraft 1.11.2</version>
                    <version>Minecraft 1.12 Pre-Release 6</version>
                    <version>Minecraft 1.12.1</version>
                    <version>Minecraft 1.12.2 Pre-Release 1</version>
                    <version>Minecraft 1.12.2</version>
                    <version>Minecraft 18w05a</version>
                    <version>Minecraft 18w09a</version>
                    <version>Minecraft 1.13</version>
                    <version>Minecraft 18w30b</version>
                    <version>Minecraft 1.13.1</version>
                    <version>Minecraft 1.13.2-pre1</version>
                    <version>Minecraft 1.13.2-pre2</version>
                    <version>Minecraft 1.13.2</version>
                                    <fixVersion>Minecraft 18w43a</fixVersion>
                                                        <votes>48</votes>
                                    <watches>26</watches>
                                                                            <comments>
                            <comment id="488497" author="redcmd" created="Wed, 12 Sep 2018 00:22:39 +0200"  >&lt;p&gt;If the stone platform is at y=200&lt;br/&gt;
 and is 57 or more blocks across (square)&lt;br/&gt;
 and all blocks under the platform is air&lt;/p&gt;

&lt;p&gt;X=29 (Distance of Light spread from center) Y=200 (Height of platform)&lt;br/&gt;
 Breaking the block in the middle will produce .5(X^2+1)Y+1 = 84200 (84k) skylight updates&lt;/p&gt;

&lt;p&gt;X=15 (Sky Light level) Y=200 (Height of platform)&lt;br/&gt;
 Replacing the block will produce Y((X^2+2)X^2/3)+X = 3405015 (3405k,&#160; 3.4million) skylight updates&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Oh and redstone dust does NOT produce light updates (they cause block updates)&lt;br/&gt;
 Repeaters used to in 1.5.2 but that got removed due to lag&lt;/p&gt;</comment>
                            <comment id="488487" author="oval" created="Tue, 11 Sep 2018 23:51:46 +0200"  >&lt;p&gt;&lt;a href=&quot;https://bugs.mojang.com/secure/ViewProfile.jspa?name=RedCMD&quot; class=&quot;user-hover&quot; rel=&quot;RedCMD&quot;&gt;RedCMD&lt;/a&gt; It literally doesn&apos;t matter. you still drop frames on Y: 200&lt;/p&gt;</comment>
                            <comment id="488485" author="redcmd" created="Tue, 11 Sep 2018 23:45:51 +0200"  >&lt;p&gt;change &quot;fill ~20 ~200 ~-20 ~-20 ~200 ~20&quot; to &quot;/fill ~20 240 ~-20 ~-20 240 ~20&quot;&lt;/p&gt;

&lt;p&gt;and &quot;/tp @a ~ ~205 ~&quot; to &quot;/tp @p ~ 250 ~&quot;&lt;/p&gt;</comment>
                            <comment id="477513" author="redranger12" created="Sat, 28 Jul 2018 20:27:03 +0200"  >&lt;p&gt;confirmed for breaking last bedrock level on 18w30b&lt;/p&gt;</comment>
                            <comment id="434752" author="thedoctorlink" created="Tue, 13 Feb 2018 10:58:02 +0100"  >&lt;p&gt;This also occurs on Java 8 and on Linux.&lt;/p&gt;</comment>
                            <comment id="432939" author="luxikeks" created="Sun, 4 Feb 2018 18:56:05 +0100"  >&lt;p&gt;This is affecting every 1.13 snapshot as well.&lt;/p&gt;</comment>
                            <comment id="407252" author="bidws" created="Tue, 19 Sep 2017 06:28:43 +0200"  >&lt;p&gt;From all comments I noticed this is both client-side and server-side issue. When removing light source at underground, it would lag more than if you remove it at surface during daytime. More checks needed about light updates client-side and server-side.&lt;/p&gt;</comment>
                            <comment id="406575" author="mcmodknower" created="Wed, 13 Sep 2017 20:26:21 +0200"  >&lt;p&gt;Still in 1.12.2 Pre-release. Please fix this Mojang.&lt;br/&gt;
If you put a Piston on the right Position with a clock you can effectively crash every client in the sourrounding.&lt;br/&gt;
 &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;147000_thumb&quot; href=&quot;https://bugs.mojang.com/secure/attachment/147000/147000_screenshot-1.png&quot; title=&quot;screenshot-1.png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;147000&quot; file-preview-title=&quot;screenshot-1.png&quot;&gt;&lt;img src=&quot;https://bugs.mojang.com/secure/thumbnail/147000/_thumb_147000.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt; &lt;/p&gt;</comment>
                            <comment id="385596" author="midnaait" created="Wed, 31 May 2017 09:59:42 +0200"  >&lt;p&gt;Still happening in the 1.12 pre-release 6&lt;/p&gt;</comment>
                            <comment id="300896" author="2called-chaos" created="Tue, 19 Apr 2016 20:55:06 +0200"  >&lt;p&gt;Well you can add 1.9.2 to the list and I don&apos;t really think this is a creative only issue either... I noticed lagspikes when building the roof and the last block just kills it completely (client and server both on quite some hardware)...&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://www.youtube.com/watch?v=UdZ-mKk5i1Q&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.youtube.com/watch?v=UdZ-mKk5i1Q&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="276215" author="alunblue14" created="Tue, 5 Jan 2016 00:20:06 +0100"  >&lt;p&gt;The way I came across this bug was when changing a large 1 block tall plane of grass blocks. Since there was no light underneath the platform, it would lag when removing the light from underneath the platform when the hole creating the light (from the sky) was filled in. This only happened when the light went away.&lt;/p&gt;

&lt;p&gt;For me it specifically caused a 2 - 3 second lag in root.tick.keyboard&lt;/p&gt;</comment>
                            <comment id="273343" author="plng" created="Sat, 19 Dec 2015 12:40:07 +0100"  >&lt;p&gt;&quot;Simple&quot; build that confirms the issue.&lt;br/&gt;
Punch obsidian to observe normal behavior.&lt;br/&gt;
Toggle lever (This slides a block under the chest to expose darkness)&lt;br/&gt;
Punch obsidian to observe the lag.&lt;/p&gt;

&lt;p&gt;These spike to 50% for me:  &lt;br/&gt;
root.gamerenderer.level.terrain_setup.culling.build_near 1.8.9  &lt;br/&gt;
root.tick.level.entities.blockEntities.aqr.checkedPosition 15w51b&lt;/p&gt;</comment>
                            <comment id="261248" author="JIRAUSER71590" created="Tue, 3 Nov 2015 11:54:34 +0100"  >&lt;p&gt;confirmed for 15w44b&lt;/p&gt;</comment>
                            <comment id="216326" author="ericz1" created="Sun, 18 Jan 2015 22:23:49 +0100"  >&lt;p&gt;Confirmed in 1.8.2-pre4. The lag seems much more extreme when blocking the light than when removing the block.&lt;/p&gt;</comment>
                            <comment id="211951" author="bentroen" created="Tue, 16 Dec 2014 21:41:31 +0100"  >&lt;p&gt;Confirmed for 1.8.1. As a prove that this is related to lighting, if you cover yourself in a 1x2x1 hole with no light (or any room with a low light level), open a hole to the void, and then cover it, it will not lag, because of the low light level. But if you don&apos;t block the light, it will lag a lot.&lt;/p&gt;</comment>
                            <comment id="211049" author="kingsupernova" created="Mon, 8 Dec 2014 05:06:32 +0100"  >&lt;p&gt;I noticed that this only happens with opaque blocks, implying that it is a lighting issue. Also, if the hole you are filling in is filled with water, it won&apos;t lag. By the way, a much easier way to test this is to just make a one layer thick superflat world.&lt;/p&gt;</comment>
                            <comment id="204572" author="ericz1" created="Tue, 21 Oct 2014 06:19:41 +0200"  >&lt;p&gt;Confirmed for 1.8.1-pre2.&lt;/p&gt;</comment>
                            <comment id="202926" author="ericz1" created="Fri, 10 Oct 2014 04:38:12 +0200"  >&lt;p&gt;Are the affected versions still getting updated? (&lt;a href=&quot;https://bugs.mojang.com/browse/MC-72310&quot; title=&quot;Huge momentary block lag when placing a block&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MC-72310&quot;&gt;&lt;del&gt;MC-72310&lt;/del&gt;&lt;/a&gt; is for 1.8.)&lt;/p&gt;</comment>
                            <comment id="169029" author="gamegirlxl" created="Sun, 29 Jun 2014 00:53:24 +0200"  >&lt;p&gt;I&apos;ve heard that this can be problematic for complicated, exposed redstone mechanisms (because lighting updates need to occur whenever dust and such turns on/off).&lt;/p&gt;</comment>
                            <comment id="151883" author="strangeone101" created="Mon, 21 Apr 2014 12:34:37 +0200"  >&lt;p&gt;I can reproduce this in the latest 14w11b snapshot. Causes lag that lasts just under half a second.&lt;/p&gt;


&lt;p&gt;Way to reproduce:&lt;/p&gt;

&lt;p&gt;1. Create a new world and dig down with a 1x1 tunnel to bedrock level.&lt;br/&gt;
2. Use the fill command to dig out a 40x10x40 area around you.&lt;br/&gt;
3. Remove all light in the area.&lt;br/&gt;
4. While standing in the empty area, place 1 block in the tunnel you dug to block the light from the sky. Can also be seen when the block is removed.&lt;/p&gt;</comment>
                            <comment id="148575" author="fienxjox" created="Sat, 22 Mar 2014 20:51:30 +0100"  >&lt;p&gt;Cannot reproduce in 14w11b.  World preset used:&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;2;1x7,10x0,1x3;2;&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;The used:&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;/fill ~ ~ ~ ~-40 ~-1 ~40 minecraft:air&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;to cause as many lighting updates as possible.  Smooth lighting at maximum, render distance 16.&lt;/p&gt;</comment>
                            <comment id="51914" author="kumasasa" created="Mon, 11 Mar 2013 23:00:39 +0100"  >&lt;p&gt;Confirmed.&lt;br/&gt;
Getting &lt;/p&gt;
&lt;div class=&quot;code panel&quot; style=&quot;border-width: 1px;&quot;&gt;&lt;div class=&quot;codeContent panelContent&quot;&gt;
&lt;pre class=&quot;code-java&quot;&gt;2013-03-11 22:57:56 [SERVER] [WARNING] Can&apos;t keep up! Did the system time change, or is the server overloaded?
2013-03-11 22:58:12 [SERVER] [WARNING] Can&apos;t keep up! Did the system time change, or is the server overloaded?
2013-03-11 22:59:20 [SERVER] [WARNING] Can&apos;t keep up! Did the system time change, or is the server overloaded?
2013-03-11 23:00:06 [SERVER] [WARNING] Can&apos;t keep up! Did the system time change, or is the server overloaded?
2013-03-11 23:00:11 [SERVER] [INFO] Saving and pausing game...
&lt;/pre&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;in the console.&lt;/p&gt;</comment>
                            <comment id="51900" author="ds84182" created="Mon, 11 Mar 2013 22:37:21 +0100"  >&lt;p&gt;I don&apos;t think I broke the redstone, so it may still be running.&lt;/p&gt;</comment>
                            <comment id="51899" author="kumasasa" created="Mon, 11 Mar 2013 22:35:12 +0100"  >&lt;p&gt;Yes, please upload the world.&lt;br/&gt;
The crash report isn&apos;t helpful.&lt;/p&gt;</comment>
                            <comment id="51897" author="ds84182" created="Mon, 11 Mar 2013 22:32:32 +0100"  >&lt;p&gt;In vanilla, I made a piston that would extend and rectract on an uncovered block. The lag was horrendous. I got down to 0 fps before the F3+C worked. I can upload the world if you want me to.&lt;/p&gt;</comment>
                            <comment id="51891" author="kumasasa" created="Mon, 11 Mar 2013 22:10:16 +0100"  >&lt;p&gt;Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.&lt;/p&gt;</comment>
                            <comment id="51868" author="ds84182" created="Mon, 11 Mar 2013 20:47:53 +0100"  >&lt;p&gt;Also, root.tick.keyboard lags when you break the block.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10102">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="97916">MC-70253</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="100120">MC-72310</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="102704">MC-74637</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="120404">MC-87947</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="125730">MC-92035</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="126753">MC-92686</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="109102">MC-95513</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="140665">MC-101850</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="141295">MC-102346</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="145043">MC-104458</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="145645">MC-104812</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="146222">MC-105156</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="146555">MC-105353</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="171819">MC-118032</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="192551">MC-125149</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="194832">MC-126740</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="205589">MC-132376</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="213016">MC-136549</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="181289" name="2018-08-29_04.15.51.png" size="185683" author="Oval" created="Thu, 30 Aug 2018 03:54:42 +0200"/>
                            <attachment id="181287" name="2018-08-29_04.18.00.png" size="552818" author="Oval" created="Thu, 30 Aug 2018 03:54:39 +0200"/>
                            <attachment id="106984" name="Debug-test-15w51b.zip" size="818514" author="plng" created="Sat, 19 Dec 2015 12:40:07 +0100"/>
                            <attachment id="24239" name="LightBug.zip" size="136984" author="ds84182" created="Mon, 11 Mar 2013 22:37:21 +0100"/>
                            <attachment id="181288" name="MC-136549.mp4" size="7984297" author="Oval" created="Thu, 30 Aug 2018 03:54:40 +0200"/>
                            <attachment id="24237" name="crash-2013-03-11_17.26.29-client.txt" size="2776" author="ds84182" created="Mon, 11 Mar 2013 22:28:39 +0100"/>
                            <attachment id="24227" name="decoded.log" size="6124" author="ds84182" created="Mon, 11 Mar 2013 20:46:28 +0100"/>
                            <attachment id="147000" name="screenshot-1.png" size="271802" author="McModknower" created="Wed, 13 Sep 2017 20:26:10 +0200"/>
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