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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-535] Random 1-2 sec Freezes SSP New World in 1.4.2</title>
                <link>https://bugs.mojang.com/browse/MC-535</link>
                <project id="10400" key="MC">Minecraft: Java Edition</project>
                    <description>&lt;p&gt;random 1-2sec freezes, in new world (1.4.2) &quot;single player mode&quot;, no mods.&lt;br/&gt;
On freeze: java occupie 100% CPU usage at all 8 Logical cores.&lt;/p&gt;

&lt;p&gt;following message in console: &lt;br/&gt;
&quot;WARNING: Can&apos;t keep up! Did the system time change, or is the server overloaded?&quot;&lt;/p&gt;

&lt;p&gt;Seems related to un-allocating of memory.(According to F3 Debug information), (might be an issue with GC?)&lt;/p&gt;

&lt;p&gt;UPDATE: &lt;br/&gt;
Configured java arguments manually so that &quot;-Xmx4096M -Xms4096M&quot;, problem still persist, so it&apos;s not related to java memory allocation changes.&lt;/p&gt;

&lt;p&gt;Also tried with OpenJRE 1.7, with no change.&lt;/p&gt;

&lt;p&gt;No related messages in syslog.&lt;/p&gt;

&lt;p&gt;appending bug description:&lt;br/&gt;
if it freezes while &quot;Minecraft Music&quot; is playing; when freeze ends the music does not continue to play. &lt;/p&gt;

&lt;p&gt;UPDATE 2:&lt;/p&gt;

&lt;p&gt;Ok, so it may be a memory leak, chunk unloading or something wrong with garbage collecting,&lt;/p&gt;

&lt;p&gt;Before freeze, memory usage builds up from around ~400MB to &amp;gt;1050-1500MB of total the total 3500ish MB, then it freezes for 1-2 secounds and jumps down to ~400MB.&lt;/p&gt;
</description>
                <environment>Linux Fedora 17 x64 - Oracle Java (JRE) 1.7.0_u9-b05</environment>
        <key id="11802">MC-535</key>
            <summary>Random 1-2 sec Freezes SSP New World in 1.4.2</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="7">Invalid</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="johneh87">John-Erik Haugen</reporter>
                        <labels>
                    </labels>
                <created>Thu, 25 Oct 2012 20:39:25 +0200</created>
                <updated>Wed, 28 Nov 2012 22:31:48 +0100</updated>
                            <resolved>Sun, 25 Nov 2012 19:20:07 +0100</resolved>
                                    <version>Minecraft 1.4.2</version>
                                                                        <votes>4</votes>
                                    <watches>2</watches>
                                                                            <comments>
                            <comment id="25582" author="johneh87" created="Wed, 28 Nov 2012 22:31:48 +0100"  >&lt;p&gt;@Tails&lt;br/&gt;
No, this IS Vanilla Minecraft, NOT modded minecraft, i do NOT have any plugins installed when i experience this issue.&lt;/p&gt;

&lt;p&gt;I use the 100% standard Minecraft downloaded from Minecraft.net when this issue appears.&lt;/p&gt;

&lt;p&gt;However, i DID try to add unofficial plugins (Optifine) to resolve the issue, without success.&lt;/p&gt;</comment>
                            <comment id="24874" author="last_username" created="Sun, 25 Nov 2012 19:47:39 +0100"  >&lt;p&gt;I&apos;m still experiencing this in unmodified 1.4.5 client+server. Not sure why the bug was closed.&lt;/p&gt;</comment>
                            <comment id="24866" author="bljat" created="Sun, 25 Nov 2012 19:15:49 +0100"  >&lt;p&gt;This ticket is invalid as it relates to a modded or 3rd party client/server.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.&lt;/li&gt;
	&lt;li&gt;Any plugin issues need to be addressed to the plugin creator.&lt;/li&gt;
	&lt;li&gt;This site is for addressing issues related to the base unmodded MineCraft.&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="18163" author="mstiles92" created="Sun, 4 Nov 2012 21:41:17 +0100"  >&lt;p&gt;I have this problem as well. It appears to be related to sounds loading. It seems to only be certain sounds (cow, minecart, ladder, a few step sounds, and especially a certain ambient sound that plays occasionally), but the game freezes for a couple seconds right before/while playing them. Pressing escape to pause the game and then unpausing it immediately fixes the lag (and causes the sound to stop).&lt;/p&gt;</comment>
                            <comment id="18158" author="last_username" created="Sun, 4 Nov 2012 21:32:11 +0100"  >&lt;p&gt;I have definitely noticed a new and distinctive freeze lasting about a second and happening every few minutes. I just noticed it in 1.4.3 but it may have also been in 1.4.2. It&apos;s not much older than that though. It happens in both the Overworld and the Nether, and I can&apos;t correlate it with any particular activity or game event. I&apos;ll let you know if I figure anything else out.&lt;/p&gt;</comment>
                            <comment id="17400" author="johneh87" created="Fri, 2 Nov 2012 23:05:16 +0100"  >&lt;p&gt;Regarding message posted: 27/Oct/12 by me.&lt;/p&gt;


&lt;p&gt;I still have the issue. but not as frequently as before.&lt;/p&gt;

&lt;p&gt;It defiantly have something related with &quot;memory release&quot; or allocation.&lt;img class=&quot;emoticon&quot; src=&quot;https://bugs.mojang.com/images/icons/emoticons/help_16.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="14326" author="johneh87" created="Sat, 27 Oct 2012 11:29:32 +0200"  >&lt;p&gt;No i dont think its texture packs that cause this. because i only use the vanilla textures. nothing else.&lt;/p&gt;</comment>
                            <comment id="14248" author="ordinaryman" created="Sat, 27 Oct 2012 04:06:53 +0200"  >&lt;p&gt;I&apos;ve discovered that going 100% vanilla fixes the problem... I think there&apos;s something wrong with how people make texture packs.... as trying several different packs reproduced the problem, but vanilla always works fine. Talking version 1.4.2 &lt;/p&gt;</comment>
                            <comment id="14234" author="johneh87" created="Sat, 27 Oct 2012 03:04:15 +0200"  >&lt;p&gt;For information: &lt;br/&gt;
I tested about 15 minutes on snapshot 12w42b, and could NOT recreate the issue. weird..&lt;/p&gt;

&lt;p&gt;Update:&lt;br/&gt;
Very weird, somehow i cant recreate the issue in 1.4.2, so maybe a java issue.&lt;/p&gt;

&lt;p&gt;I have reinstalled java 1.7.0u9, (used tar.gz instead of rpm), manually updated lwjgl (2.8.4)), changed the &quot;driver&quot; and &quot;device&quot; options in /etc/openal/alsoft.conf, and added the following command line options to java &quot;-XX:+UseG1GC -XX:MaxGCPauseMillis=100&quot;. i&apos;ll test more tomorrow to confirm that the issue has been resolved.&lt;/p&gt;</comment>
                            <comment id="14221" author="johneh87" created="Sat, 27 Oct 2012 01:53:14 +0200"  >&lt;p&gt;Tested with optifine 1.4.2, did not solve the issue.&lt;/p&gt;

&lt;p&gt;However:&lt;br/&gt;
Added some additional debug info that is displayed.&lt;br/&gt;
The messages are printed to console right after a freeze.&lt;br/&gt;
when debug is activated in Optifine.&lt;/p&gt;</comment>
                            <comment id="14036" author="johneh87" created="Fri, 26 Oct 2012 17:59:16 +0200"  >&lt;p&gt;Tried downgrading java to version 1.7.0_u7, did not fix the problem.&lt;/p&gt;</comment>
                            <comment id="13669" author="ordinaryman" created="Fri, 26 Oct 2012 00:15:42 +0200"  >&lt;p&gt;Yes, I have noticed a &quot;freeze&quot; when any sound file initiates. Turning off the music helps immensely with that aspect of our problem. I hope this info helps a little, trying to think of everything related to this.&lt;/p&gt;

&lt;p&gt;(BTW... I have given java up to 12gb of RAM... makes absolutely no difference)&lt;/p&gt;</comment>
                            <comment id="13498" author="johneh87" created="Thu, 25 Oct 2012 21:56:13 +0200"  >&lt;p&gt;will try to update ljwgl. and give feedback if that solves the problem.&lt;br/&gt;
Update: it did not.&lt;/p&gt;</comment>
                            <comment id="13425" author="ordinaryman" created="Thu, 25 Oct 2012 20:49:45 +0200"  >&lt;p&gt;I have this issue too... however for some unknown reason, my system recovers from the issue before the CPU usage hits 100%... on the other hand, the &quot;lag&quot; spikes come quite often.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="11105" name="debuginfo.txt" size="17415" author="johneh87" created="Sat, 27 Oct 2012 01:53:14 +0200"/>
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