SIGSEGV when accessing a Language

[ObserverOfTime]

Regarding the Arena.ofConfined() usage: I tested it now in a Linux Docker container and it is crashing there as well with a SIGSEGV. To be safe, could you please try as well?
My code looked like this:

Language language;
try (Arena arena = Arena.ofConfined()) {
    SymbolLookup symbols = SymbolLookup.libraryLookup(Path.of("libtree-sitter-java.so"), arena);
    language = Language.load(symbols, "tree_sitter_java");
}
try (var parser = new Parser(language)) {
    try (var tree = parser.parse(source).get()) {
        var rootNode = tree.getRootNode();
    }
}

The language pointer is copied into the library arena anyway, so the initial arena shouldn't affect it.

Do you mean this code in the Language constructor?

java-tree-sitter/src/main/java/io/github/treesitter/jtreesitter/Language.java

Lines 42 to 43 in 364154c

	public Language(MemorySegment self) throws IllegalArgumentException {
	this.self = self.reinterpret(LIBRARY_ARENA, TreeSitter::ts_language_delete);

The documentation of reinterpret says (emphasis mine):

Returns a new memory segment with the same address and size as this segment, but with the provided scope.

So maybe this is not actually performing a copy, and therefore after the library was unloaded still refers to that (now unloaded) memory area?
(maybe applies to the other reinterpret calls in this library as well then)

Originally posted by @Marcono1234 in #24 (comment)

[ObserverOfTime]

https://docs.oracle.com/en/java/javase/22/docs/api/java.base/java/lang/foreign/SymbolLookup.html#libraryLookup(java.lang.String,java.lang.foreign.Arena)

Loads a library with the given name (if not already loaded) and creates a symbol lookup for symbols in that library. The lifetime of the returned library lookup is controlled by the provided arena. For instance, if the provided arena is a confined arena, the library associated with the returned lookup will be unloaded when the provided confined arena is closed.