fix: shared queue requires aligned buffer (#2816)

1 files changed, 4 insertions, 1 deletions

diff --git a/cli/ops/dispatch_json.rs b/cli/ops/dispatch_json.rs
index a575aedb3..77d76f39f 100644
--- a/cli/ops/dispatch_json.rs
+++ b/cli/ops/dispatch_json.rs
@@ -37,7 +37,10 @@ fn serialize_result(
     Ok(v) => json!({ "ok": v, "promiseId": promise_id }),
     Err(err) => json!({ "err": json_err(err), "promiseId": promise_id }),
   };
-  let vec = serde_json::to_vec(&value).unwrap();
+  let mut vec = serde_json::to_vec(&value).unwrap();
+  debug!("JSON response pre-align, len={}", vec.len());
+  // Align to 32bit word, padding with the space character.
+  vec.resize((vec.len() + 3usize) & !3usize, b' ');
   vec.into_boxed_slice()
 }