Affects Version/s: Minecraft 18w31a, Minecraft 1.13.1, Minecraft 1.13.2, Minecraft 18w45a, 1.14.4, 1.15 Pre-release 6, 1.15.2
Fix Version/s: None
When LWJGL is in debug mode, it checks for null pointers. This breaks the forced JVM crash, which uses MemoryUtil.memSet(0L, 0, 1L) which performs such a check.
- Add -Dorg.lwjgl.util.Debug=true to the JVM arguments to enable LWJGL debug mode.
- Hold right control+F3+C
- The game will crash with the attached report with an java.lang.IllegalArgumentException. The JVM will not crash.
(note: if you get a regular "Manually triggered debug crash", then the forced JVM crash did not trigger due to
MC-135509; that is not this issue).
Use a memory address other than 0. For instance, 1 would be fine, and in this case memPutByte could be used (which normally wouldn't work as memPutByte always checks for null pointers, which is why I assume memSet was used). Alternatively, 0xDEADBEEF would be recognizable as an intended debug value.