OOM during unifont font loading

[gioyous-it]

----- Minosoft Crash Report -----
// //TODO: What the hell is causing this?

-- General information --
    Time: 2026-08-28 15:17:21 (1787923041)
    Thread: RenderingPool#0
    Notes: -/-

-- Stacktrace --
    java.lang.Exception: Exception in rendering: 14
    	at de.bixilon.minosoft.gui.rendering.RenderLoader$load$$inlined$runAsync$default$2.run(RenderUtil.kt:39)
    	at de.bixilon.kutil.concurrent.pool.ThreadPoolExecutor.execute(ThreadPoolExecutor.kt:26)
    	at de.bixilon.kutil.concurrent.pool.threads.ThreadPoolThread.loop(ThreadPoolThread.kt:49)
    	at de.bixilon.kutil.concurrent.pool.threads.ThreadPoolThread.run(ThreadPoolThread.kt:31)
    Caused by: java.lang.OutOfMemoryError: Cannot reserve 4194304 bytes of direct buffer memory (allocated: 863774982, limit: 864026624)
    	at java.base/java.nio.Bits.reserveMemory(Bits.java:188)
    	at java.base/java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:109)
    	at java.base/java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:367)
    	at de.bixilon.minosoft.gui.rendering.system.base.texture.data.buffer.RGBA8Buffer.<init>(RGBA8Buffer.kt:33)
    	at de.bixilon.minosoft.gui.rendering.system.base.texture.data.buffer.RGBA8Buffer.<init>(RGBA8Buffer.kt)
    	at de.bixilon.minosoft.gui.rendering.font.types.unicode.unihex.UnifontTexture.<init>(UnifontTexture.kt:37)
    	at de.bixilon.minosoft.gui.rendering.font.types.unicode.unihex.UnifontRasterizer.createTexture(UnifontRasterizer.kt:60)
    	at de.bixilon.minosoft.gui.rendering.font.types.unicode.unihex.UnifontRasterizer.forceAdd(UnifontRasterizer.kt:50)
    	at de.bixilon.minosoft.gui.rendering.font.types.unicode.unihex.UnifontRasterizer.add(UnifontRasterizer.kt:38)
    	at de.bixilon.minosoft.gui.rendering.font.types.unicode.unihex.UnihexFontType$Companion.load(UnihexFontType.kt:75)
    	at de.bixilon.minosoft.gui.rendering.font.types.unicode.unihex.UnihexFontType$Companion.load(UnihexFontType.kt:66)
    	at de.bixilon.minosoft.gui.rendering.font.types.unicode.unihex.UnihexFontType$Companion.build(UnihexFontType.kt:49)
    	at de.bixilon.minosoft.gui.rendering.font.types.unicode.unihex.UnihexFontType$Companion.build(UnihexFontType.kt:42)
    	at de.bixilon.minosoft.gui.rendering.font.loader.FontLoader.load$lambda$1(FontLoader.kt:51)
    	at de.bixilon.kutil.concurrent.worker.unconditional.UnconditionalWorker.run(UnconditionalWorker.kt:62)
    	at de.bixilon.kutil.concurrent.worker.unconditional.UnconditionalWorker.work(UnconditionalWorker.kt:96)
    	at de.bixilon.minosoft.gui.rendering.font.loader.FontLoader.load(FontLoader.kt:54)
    	at de.bixilon.minosoft.gui.rendering.font.manager.FontManager.load(FontManager.kt:55)
    	at de.bixilon.minosoft.gui.rendering.font.types.ReferenceFontType.build(ReferenceFontType.kt:28)
    	at de.bixilon.minosoft.gui.rendering.font.loader.FontLoader.load$lambda$1(FontLoader.kt:51)
    	at de.bixilon.kutil.concurrent.worker.unconditional.UnconditionalWorker.run(UnconditionalWorker.kt:62)
    	at de.bixilon.kutil.concurrent.worker.unconditional.UnconditionalWorker.work(UnconditionalWorker.kt:96)
    	at de.bixilon.minosoft.gui.rendering.font.loader.FontLoader.load(FontLoader.kt:54)
    	at de.bixilon.minosoft.gui.rendering.font.manager.FontManager.load(FontManager.kt:55)
    	at de.bixilon.minosoft.gui.rendering.font.manager.FontManager$Companion.create(FontManager.kt:67)
    	at de.bixilon.minosoft.gui.rendering.RenderLoader$load$$inlined$runAsync$default$2.run(RenderUtil.kt:65)
    	... 3 more
    

-- Runtime details --
    Start arguments: []
    JVM flags: []
    Environment: {KDE_SESSION_UID=1000, XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session1, MANAGERPIDFDID=5680, KONSOLE_DBUS_ACTIVATION_COOKIE=/lUfmMW7g5jZpfFZlX/rNg69WspZiSy2s6t7puEDeEU=, KDE_APPLICATIONS_AS_SCOPE=1, LC_TIME=it_IT.UTF-8, XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0, IM_CONFIG_ENTRY=profile, _JAVA_AWT_WM_NONREPARENTING=1, XKB_DEFAULT_VARIANT=scn, PATH=/home/sortino/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/sortino/.local/bin:/home/sortino/.local/bin, LESSCLOSE=/usr/bin/lesspipe %s %s, LOGNAME=sortino, XDG_MENU_PREFIX=plasma-, LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=00:su=37;41:sg=30;43:ca=00:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.avif=01;35:*.jpg=01;35:*.jpeg=01;35:*.mjpg=01;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.webp=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.m4a=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.oga=00;36:*.opus=00;36:*.spx=00;36:*.xspf=00;36:*~=00;90:*#=00;90:*.bak=00;90:*.old=00;90:*.orig=00;90:*.part=00;90:*.rej=00;90:*.swp=00;90:*.tmp=00;90:*.dpkg-dist=00;90:*.dpkg-old=00;90:*.ucf-dist=00;90:*.ucf-new=00;90:*.ucf-old=00;90:*.rpmnew=00;90:*.rpmorig=00;90:*.rpmsave=00;90:, XDG_CONFIG_DIRS=/home/sortino/.config/kdedefaults:/etc/xdg:/usr/share/kubuntu-default-settings/kf5-settings, WAYLAND_DISPLAY=wayland-0, SSH_ASKPASS=/usr/bin/ksshaskpass, XAUTHORITY=/run/user/1000/xauth_lDMOOE, LC_PAPER=it_IT.UTF-8, LC_MEASUREMENT=it_IT.UTF-8, XDG_SESSION_ID=3, SSH_ASKPASS_REQUIRE=prefer, KONSOLE_DBUS_WINDOW=/Windows/1, QT_ACCESSIBILITY=1, XKB_DEFAULT_LAYOUT=it, XDG_SEAT=seat0, XDG_VTNR=2, XDG_SESSION_DESKTOP=KDE, DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus, LC_TELEPHONE=it_IT.UTF-8, INVOCATION_ID=3a5d10e8266f40fabcc090a2d7053c84, LC_ADDRESS=it_IT.UTF-8, SHLVL=1, ICEAUTHORITY=/run/user/1000/iceauth_oQswkj, XDG_DATA_DIRS=/home/sortino/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share:/var/lib/snapd/desktop, SHELL=/bin/bash, XDG_SESSION_CLASS=user, COLORTERM=truecolor, SESSION_MANAGER=local/gioyous-it:@/tmp/.ICE-unix/3045,unix/gioyous-it:/tmp/.ICE-unix/3045, LC_IDENTIFICATION=it_IT.UTF-8, DISPLAY=:0, HOME=/home/sortino, MEMORY_PRESSURE_WATCH=/sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/session.slice/plasma-plasmashell.service/memory.pressure, COLORFGBG=15;0, XDG_CURRENT_DESKTOP=KDE, DEBUGINFOD_URLS=https://debuginfod.ubuntu.com , TERM=xterm-256color, KONSOLE_DBUS_SESSION=/Sessions/1, KDE_SESSION_VERSION=6, LC_NUMERIC=it_IT.UTF-8, LC_NAME=it_IT.UTF-8, GTK_RC_FILES=/etc/gtk/gtkrc:/home/sortino/.gtkrc:/home/sortino/.config/gtkrc, LANG=en_US.UTF-8, LESSOPEN=| /usr/bin/lesspipe %s, PROFILEHOME=, WINDOWID=110413210307280, GTK2_RC_FILES=/etc/gtk-2.0/gtkrc:/home/sortino/.gtkrc-2.0:/home/sortino/.config/gtkrc-2.0, KONSOLE_VERSION=251203, LANGUAGE=, QT_WAYLAND_RECONNECT=1, MEMORY_PRESSURE_WRITE=c29tZSAyMDAwMDAgMjAwMDAwMAA=, SYSTEMD_EXEC_PID=3093, OPENROUTER_API_KEY=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, XDG_RUNTIME_DIR=/run/user/1000, KONSOLE_DBUS_SERVICE=:1.70, XKB_DEFAULT_MODEL=pc105, SSH_AUTH_SOCK=/run/user/1000/openssh_agent, PAM_KWALLET5_LOGIN=/run/user/1000/kwallet5.socket, GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1, MANAGERPID=2718, DESKTOP_SESSION=plasma, USER=sortino, KDE_FULL_SESSION=true, XDG_SESSION_TYPE=wayland, LC_MONETARY=it_IT.UTF-8, PWD=/home/sortino, _=/usr/bin/java, JOURNAL_STREAM=10:22181, SHELL_SESSION_ID=bd704eeedec84c658320e51ee72f8d84}
    Home path: /home/sortino/.local/share/minosoft
    Profiles path: /home/sortino/.config/minosoft

-- System information --
    Operating system: Linux: Ubuntu 64bit
    Platform os: linux
    Platform architecture: amd64
    Java: 26.0.1+8-2-26.04.2-Ubuntu 64bit
    Memory: 3.2 GiB
    Processor: 2x AMD 3020e with Radeon Graphics

-- Graphic Cards --
    #0
        Name: Picasso/Raven 2 [Radeon Vega Series / Radeon Vega Mobile Series]
        Device id: 0x15d8
        VRam: 0
        Vendor: Advanced Micro Devices, Inc. [AMD/ATI] (0x1002)
        Version info: Rev:	df

-- Sessions --
    #0
        Id: 3
        Version: 1.8.9
        Account: gioyous
        Address: forums.hypixel.net
        Brand: unknown
        Events: 46
        State: DISCONNECTED
        Network state: null
        Compression threshold: -1
        Encrypted: false
        Was connected: true
        Rendering: true
        Error: de.bixilon.minosoft.protocol.network.network.client.netty.exceptions.PacketHandleException
    #1
        Id: 14
        Version: 1.20.4
        Account: gioyous
        Address: alt3.6b6t.org
        Brand: unknown
        Events: 18
        State: DISCONNECTED
        Network state: null
        Compression threshold: null
        Encrypted: null
        Was connected: false
        Rendering: true
        Error: java.lang.OutOfMemoryError: Cannot reserve 4194304 bytes of direct buffer memory (allocated: 863774982, limit: 864026624)
    #2
        Id: 5
        Version: 1.20.4
        Account: gioyous
        Address: play.boholmc.net
        Brand: unknown
        Events: 47
        State: DISCONNECTED
        Network state: null
        Compression threshold: -1
        Encrypted: false
        Was connected: true
        Rendering: true
        Error: io.netty.handler.codec.EncoderException: PacketEncoder must produce at least one message.
    #3
        Id: 6
        Version: 1.20.4
        Account: gioyous
        Address: play.boholmc.net
        Brand: unknown
        Events: 47
        State: DISCONNECTED
        Network state: null
        Compression threshold: -1
        Encrypted: false
        Was connected: true
        Rendering: true
        Error: io.netty.handler.codec.EncoderException: PacketEncoder must produce at least one message.
    #4
        Id: 7
        Version: 1.20.4
        Account: gioyous
        Address: play.boholmc.net
        Brand: unknown
        Events: 47
        State: DISCONNECTED
        Network state: null
        Compression threshold: -1
        Encrypted: false
        Was connected: true
        Rendering: true
        Error: io.netty.handler.codec.EncoderException: PacketEncoder must produce at least one message.

-- Properties --
    Version name: 7c82b9516d
    Stable: false

-- Git --
    Commit: 7c82b9516dec505bf8affe2e70751855aa857bb8
    Branch: master
    Dirty: false

[Bixilon]

Might be a memory leak for font/texture buffers when the connection is terminated. But somehow there is a 800M memory cap for direct buffers?

[Bixilon]

While 18a17f3 should massively reduce the direct allocations (at least if font compression was not disabled), the issue is somewhere deeper. The memory is allocated using javas ByteBuffer.allocateDirect function. Somehow the memory it is capped at 800M, but most likely only due to temporary loading memory, that should be freed automatically (well, at least two cycles later). Not sure, maybe the memory is still referenced or so. This needs further investigation. This only happends on modern versions (with unifont assets), not server releated.