Allow bypass poisoned mutex. This is ok because sandbox is single-threaded

Signed-off-by: Ludvig Liljenberg <[email protected]>

Author: ludfjig

src/hyperlight_host/src/func/host_functions.rs

@@ -179,9 +179,25 @@ macro_rules! impl_host_function {
                 let func = Mutex::new(func);
                 HostFunction {
                     func: Arc::new(move |args: ($($P,)*)| {
-                        func.try_lock()
-                            .map_err(|e| new_error!("Error locking at {}:{}: {}", file!(), line!(), e))?
-                            (args)
+                        match func.try_lock() {
+                            Ok(mut guard) => {
+                                let result = guard(args);
+                                drop(guard);
+                                result
+                            },
+                            Err(poison_err) => {
+                                match poison_err {
+                                    // The previous call to this host function panicked, poisoning the lock.
+                                    // We can clear the poison safely.
+                                    std::sync::TryLockError::Poisoned(guard) => {
+                                        guard.into_inner()(args)
+                                    }
+                                    std::sync::TryLockError::WouldBlock => {
+                                        Err(new_error!("Error locking at {}:{}: mutex would block", file!(), line!()))
+                                    }
+                                }
+                            }
+                        }
                     })
                 }
             }