Merge pull request #59 from r33drichards/claude/fix-v8-init-ordering-Zq26M

Configure Rust tests to run sequentially

Author: r33drichards

server/.cargo/config.toml

@@ -0,0 +1,2 @@
+[env]
+RUST_TEST_THREADS = "1"

server/fuzz/Cargo.toml

@@ -17,6 +17,9 @@ serde = ">=1.0,<1.0.220"
 [dependencies.server]
 path = ".."
 
+[dependencies.deno_core]
+version = "0.381"
+
 # Override rmcp to use the same git source as the server crate
 [patch.crates-io]
 rmcp = { git = "https://github.com/modelcontextprotocol/rust-sdk", rev = "787cc015b719773f66d4ac32e695b9a0079e12ef" }

server/fuzz/fuzz_targets/fuzz_execute_stateful.rs

@@ -8,6 +8,9 @@ static INIT: Once = Once::new();
 
 fn ensure_v8() {
     INIT.call_once(|| {
+        // Disable V8 background threads (Maglev JIT, TurboFan, concurrent GC)
+        // to prevent cumulative memory exhaustion across fuzz iterations.
+        deno_core::v8::V8::set_flags_from_string("--single-threaded");
         server::engine::initialize_v8();
     });
 }

server/fuzz/fuzz_targets/fuzz_execute_stateless.rs

@@ -8,6 +8,9 @@ static INIT: Once = Once::new();
 
 fn ensure_v8() {
     INIT.call_once(|| {
+        // Disable V8 background threads (Maglev JIT, TurboFan, concurrent GC)
+        // to prevent cumulative memory exhaustion across fuzz iterations.
+        deno_core::v8::V8::set_flags_from_string("--single-threaded");
         server::engine::initialize_v8();
     });
 }

server/fuzz/fuzz_targets/fuzz_snapshot_deserialization.rs

@@ -6,6 +6,9 @@ static INIT: Once = Once::new();
 
 fn ensure_v8() {
     INIT.call_once(|| {
+        // Disable V8 background threads (Maglev JIT, TurboFan, concurrent GC)
+        // to prevent cumulative memory exhaustion across fuzz iterations.
+        deno_core::v8::V8::set_flags_from_string("--single-threaded");
         server::engine::initialize_v8();
     });
 }

server/fuzz/fuzz_targets/fuzz_wasm_compile.rs

@@ -7,6 +7,12 @@ static INIT: Once = Once::new();
 
 fn ensure_v8() {
     INIT.call_once(|| {
+        // Disable V8 background threads (Maglev JIT, TurboFan, concurrent GC)
+        // to prevent cumulative memory exhaustion across fuzz iterations.
+        // Without this, background compilation threads accumulate memory that
+        // isn't freed between iterations, causing fatal OOM after ~2500 runs.
+        // WASM compilation still works synchronously on the main thread.
+        deno_core::v8::V8::set_flags_from_string("--single-threaded");
         server::engine::initialize_v8();
     });
 }