I tested both launchers you mentioned above. Both MultiMC and ATLauncher both immediately crash on startup. I attached the game log before it crashed however
MultiMC version: 0.7.0-4248
Launched instance in online mode
sessionserver.mojang.com resolves to:
[2620:1ec:46::40, 2620:1ec:bdf::40, 13.107.246.40, 13.107.213.40]
textures.minecraft.net resolves to:
[2620:1ec:46::40, 2620:1ec:bdf::40, 13.107.246.40, 13.107.213.40]
api.minecraftservices.com resolves to:
[2620:1ec:46::40, 2620:1ec:bdf::40, 13.107.246.40, 13.107.213.40]
Minecraft folder is:
C:/Users/hcgar/Documents/MultiMC/instances/1.21.11/.minecraft
Java path is:
C:/Program Files/Common Files/Oracle/Java/javapath/javaw.exe
Checking Java version...
Java is version 21.0.10, using amd64 architecture, from Oracle Corporation.
Main Class:
net.minecraft.client.main.Main
Native path:
C:/Users/hcgar/Documents/MultiMC/instances/1.21.11/natives
Traits:
traits XR:Initial
traits FirstThreadOnMacOS
Libraries:
C:/Users/hcgar/Documents/MultiMC/libraries/at/yawk/lz4/lz4-java/1.8.1/lz4-java-1.8.1.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/azure/azure-json/1.4.0/azure-json-1.4.0.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/github/oshi/oshi-core/6.9.0/oshi-core-6.9.0.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/google/code/gson/gson/2.13.2/gson-2.13.2.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/google/guava/failureaccess/1.0.3/failureaccess-1.0.3.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/google/guava/guava/33.5.0-jre/guava-33.5.0-jre.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/ibm/icu/icu4j/77.1/icu4j-77.1.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/microsoft/azure/msal4j/1.23.1/msal4j-1.23.1.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/mojang/authlib/7.0.61/authlib-7.0.61.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/mojang/blocklist/1.0.10/blocklist-1.0.10.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/mojang/brigadier/1.3.10/brigadier-1.3.10.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/mojang/datafixerupper/9.0.19/datafixerupper-9.0.19.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/mojang/jtracy/1.0.37/jtracy-1.0.37.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/mojang/jtracy/1.0.37/jtracy-1.0.37-natives-windows.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/mojang/logging/1.6.11/logging-1.6.11.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/mojang/patchy/2.2.10/patchy-2.2.10.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/mojang/text2speech/1.18.11/text2speech-1.18.11.jar
C:/Users/hcgar/Documents/MultiMC/libraries/commons-codec/commons-codec/1.19.0/commons-codec-1.19.0.jar
C:/Users/hcgar/Documents/MultiMC/libraries/commons-io/commons-io/2.20.0/commons-io-2.20.0.jar
C:/Users/hcgar/Documents/MultiMC/libraries/io/netty/netty-buffer/4.2.7.Final/netty-buffer-4.2.7.Final.jar
C:/Users/hcgar/Documents/MultiMC/libraries/io/netty/netty-codec-base/4.2.7.Final/netty-codec-base-4.2.7.Final.jar
C:/Users/hcgar/Documents/MultiMC/libraries/io/netty/netty-codec-compression/4.2.7.Final/netty-codec-compression-4.2.7.Final.jar
C:/Users/hcgar/Documents/MultiMC/libraries/io/netty/netty-codec-http/4.2.7.Final/netty-codec-http-4.2.7.Final.jar
C:/Users/hcgar/Documents/MultiMC/libraries/io/netty/netty-common/4.2.7.Final/netty-common-4.2.7.Final.jar
C:/Users/hcgar/Documents/MultiMC/libraries/io/netty/netty-handler/4.2.7.Final/netty-handler-4.2.7.Final.jar
C:/Users/hcgar/Documents/MultiMC/libraries/io/netty/netty-resolver/4.2.7.Final/netty-resolver-4.2.7.Final.jar
C:/Users/hcgar/Documents/MultiMC/libraries/io/netty/netty-transport-classes-epoll/4.2.7.Final/netty-transport-classes-epoll-4.2.7.Final.jar
C:/Users/hcgar/Documents/MultiMC/libraries/io/netty/netty-transport-classes-kqueue/4.2.7.Final/netty-transport-classes-kqueue-4.2.7.Final.jar
C:/Users/hcgar/Documents/MultiMC/libraries/io/netty/netty-transport-native-unix-common/4.2.7.Final/netty-transport-native-unix-common-4.2.7.Final.jar
C:/Users/hcgar/Documents/MultiMC/libraries/io/netty/netty-transport/4.2.7.Final/netty-transport-4.2.7.Final.jar
C:/Users/hcgar/Documents/MultiMC/libraries/it/unimi/dsi/fastutil/8.5.18/fastutil-8.5.18.jar
C:/Users/hcgar/Documents/MultiMC/libraries/net/java/dev/jna/jna-platform/5.17.0/jna-platform-5.17.0.jar
C:/Users/hcgar/Documents/MultiMC/libraries/net/java/dev/jna/jna/5.17.0/jna-5.17.0.jar
C:/Users/hcgar/Documents/MultiMC/libraries/net/sf/jopt-simple/jopt-simple/5.0.4/jopt-simple-5.0.4.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/apache/commons/commons-compress/1.28.0/commons-compress-1.28.0.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/apache/commons/commons-lang3/3.19.0/commons-lang3-3.19.0.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/apache/logging/log4j/log4j-api/2.25.2/log4j-api-2.25.2.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/apache/logging/log4j/log4j-core/2.25.2/log4j-core-2.25.2.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/apache/logging/log4j/log4j-slf4j2-impl/2.25.2/log4j-slf4j2-impl-2.25.2.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/jcraft/jorbis/0.0.17/jorbis-0.0.17.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/joml/joml/1.10.8/joml-1.10.8.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/jspecify/jspecify/1.0.0/jspecify-1.0.0.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-freetype/3.3.3/lwjgl-freetype-3.3.3.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-freetype/3.3.3/lwjgl-freetype-3.3.3-natives-windows.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-freetype/3.3.3/lwjgl-freetype-3.3.3-natives-windows-arm64.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-freetype/3.3.3/lwjgl-freetype-3.3.3-natives-windows-x86.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-glfw/3.3.3/lwjgl-glfw-3.3.3.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-glfw/3.3.3/lwjgl-glfw-3.3.3-natives-windows.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-glfw/3.3.3/lwjgl-glfw-3.3.3-natives-windows-arm64.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-glfw/3.3.3/lwjgl-glfw-3.3.3-natives-windows-x86.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-jemalloc/3.3.3/lwjgl-jemalloc-3.3.3.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-jemalloc/3.3.3/lwjgl-jemalloc-3.3.3-natives-windows.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-jemalloc/3.3.3/lwjgl-jemalloc-3.3.3-natives-windows-arm64.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-jemalloc/3.3.3/lwjgl-jemalloc-3.3.3-natives-windows-x86.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-openal/3.3.3/lwjgl-openal-3.3.3.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-openal/3.3.3/lwjgl-openal-3.3.3-natives-windows.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-openal/3.3.3/lwjgl-openal-3.3.3-natives-windows-arm64.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-openal/3.3.3/lwjgl-openal-3.3.3-natives-windows-x86.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-opengl/3.3.3/lwjgl-opengl-3.3.3.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-opengl/3.3.3/lwjgl-opengl-3.3.3-natives-windows.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-opengl/3.3.3/lwjgl-opengl-3.3.3-natives-windows-arm64.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-opengl/3.3.3/lwjgl-opengl-3.3.3-natives-windows-x86.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-stb/3.3.3/lwjgl-stb-3.3.3.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-stb/3.3.3/lwjgl-stb-3.3.3-natives-windows.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-stb/3.3.3/lwjgl-stb-3.3.3-natives-windows-arm64.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-stb/3.3.3/lwjgl-stb-3.3.3-natives-windows-x86.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-tinyfd/3.3.3/lwjgl-tinyfd-3.3.3.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-tinyfd/3.3.3/lwjgl-tinyfd-3.3.3-natives-windows.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-tinyfd/3.3.3/lwjgl-tinyfd-3.3.3-natives-windows-arm64.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl-tinyfd/3.3.3/lwjgl-tinyfd-3.3.3-natives-windows-x86.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl/3.3.3/lwjgl-3.3.3.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl/3.3.3/lwjgl-3.3.3-natives-windows.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl/3.3.3/lwjgl-3.3.3-natives-windows-arm64.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/lwjgl/lwjgl/3.3.3/lwjgl-3.3.3-natives-windows-x86.jar
C:/Users/hcgar/Documents/MultiMC/libraries/org/slf4j/slf4j-api/2.0.17/slf4j-api-2.0.17.jar
C:/Users/hcgar/Documents/MultiMC/libraries/com/mojang/minecraft/1.21.11/minecraft-1.21.11-client.jar
Native libraries:
Params:
--username Hudson_458 --version 1.21.11 --gameDir C:/Users/hcgar/Documents/MultiMC/instances/1.21.11/.minecraft --assetsDir C:/Users/hcgar/Documents/MultiMC/assets --assetIndex 29 --uuid <PROFILE ID> --accessToken <ACCESS TOKEN> --versionType release
Window size: 854 x 480
Java Arguments:
[-XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump, -Xms512m, -Xmx1024m, -Duser.language=en]
Minecraft process ID: 5792
Using onesix launcher.
[19:57:17] [Datafixer Bootstrap/INFO]: 287 Datafixer optimizations took 458 milliseconds
[19:57:21] [Render thread/INFO]: Environment: Environment[sessionHost=https://sessionserver.mojang.com, servicesHost=https://api.minecraftservices.com, profilesHost=https://api.mojang.com, name=PROD]
[19:57:21] [Render thread/INFO]: Setting user: Hudson_458
[19:57:21] [Render thread/INFO]: Backend library: LWJGL version 3.3.3+5
[19:57:22] [Render thread/INFO]: Using optional rendering extensions: GL_ARB_buffer_storage, GL_KHR_debug, GL_ARB_vertex_attrib_binding, GL_ARB_direct_state_access, GL_EXT_texture_filter_anisotropic
[19:57:22] [Render thread/INFO]: Reloading ResourceManager: vanilla
[19:57:22] [Worker-Main-3/INFO]: Found unifont_pua-17.0.01.hex, loading
[19:57:22] [Worker-Main-2/INFO]: Found unifont_all_no_pua-17.0.01.hex, loading
[19:57:22] [Worker-Main-12/INFO]: Found unifont_jp_patch-17.0.01.hex, loading
Process crashed with exit code -1073740791 (0xffffffffc0000409).
Below is an analysis of the exit code. THIS MAY BE INCORRECT AND SHOULD BE TAKEN WITH A GRAIN OF SALT!
System exit code name: STATUS_STACK_BUFFER_OVERRUN
System exit code description: The system detected an overrun of a stack-based buffer in this application. This overrun could potentially allow a malicious user to gain control of this application.
Please note that usually neither the exit code, nor its description are enough to diagnose issues!
Always upload the entire log and not just the exit code.
Clipboard copy at: 15 Mar 2026 19:57:51 -0400
By
hudson_458 ·