diff --git a/crates/wasi-preview1-component-adapter/src/lib.rs b/crates/wasi-preview1-component-adapter/src/lib.rs
index 7ce52c6..ed23010 100644
--- a/crates/wasi-preview1-component-adapter/src/lib.rs
+++ b/crates/wasi-preview1-component-adapter/src/lib.rs
@@ -129,6 +129,11 @@ pub extern "C" fn run() -> u32 {
     unsafe extern "C" {
         safe fn _start();
     }
+    // Reserve adapter state before Go snapshots the linear-memory heap extent.
+    // Lazy memory.grow allocations otherwise overlap Go's sbrk allocator.
+    let state = State::ptr();
+    eprint!("before _start: ");
+    state.trace();
     _start();
     0
 }
@@ -2852,8 +2857,24 @@ unsafe extern "C" {
 }
 
 impl State {
+    fn trace(&self) {
+        eprint!("ptr=");
+        crate::macros::eprint_u32(self as *const Self as u32);
+        eprint!(" magic1=");
+        crate::macros::eprint_u32(self.magic1);
+        eprint!(" magic2=");
+        crate::macros::eprint_u32(self.magic2);
+        eprint!(" memory_pages=");
+        crate::macros::eprint_u32(core::arch::wasm32::memory_size::<0>() as u32);
+        eprintln!("");
+    }
+
     fn with(f: impl FnOnce(&State) -> Result<(), Errno>) -> Errno {
         let state_ref = State::ptr();
+        if state_ref.magic1 != MAGIC || state_ref.magic2 != MAGIC {
+            eprint!("corrupt state: ");
+            state_ref.trace();
+        }
         assert_eq!(state_ref.magic1, MAGIC);
         assert_eq!(state_ref.magic2, MAGIC);
         let ret = f(state_ref);
diff --git a/crates/wasi-preview1-component-adapter/src/macros.rs b/crates/wasi-preview1-component-adapter/src/macros.rs
index d5649f4..3b5adf4 100644
--- a/crates/wasi-preview1-component-adapter/src/macros.rs
+++ b/crates/wasi-preview1-component-adapter/src/macros.rs
@@ -40,7 +40,7 @@ pub fn eprint_unreachable(line: u32) {
     crate::macros::eprint_u32(line);
 }
 
-fn eprint_u32(x: u32) {
+pub(crate) fn eprint_u32(x: u32) {
     if x == 0 {
         eprint!("0");
     } else {