diff --git a/afl/src/executors/inmemory.rs b/afl/src/executors/inmemory.rs
index 6acca6b8b3..5963a52d14 100644
--- a/afl/src/executors/inmemory.rs
+++ b/afl/src/executors/inmemory.rs
@@ -1,11 +1,10 @@
-use alloc::rc::Rc;
-use core::cell::RefCell;
 use core::ffi::c_void;
 use core::ptr;
 
 use crate::executors::{Executor, ExitKind};
 use crate::inputs::Input;
 use crate::metamap::NamedAnyMap;
+use crate::observers::Observer;
 use crate::AflError;
 
 type HarnessFunction<I> = fn(&dyn Executor<I>, &[u8]) -> ExitKind;
@@ -15,7 +14,7 @@ where
     I: Input,
 {
     harness: HarnessFunction<I>,
-    observers: NamedAnyMap,
+    observers: NamedAnyMap<dyn Observer>,
 }
 
 static mut CURRENT_INMEMORY_EXECUTOR_PTR: *const c_void = ptr::null();
@@ -35,6 +34,14 @@ where
         }
         Ok(ret)
     }
+
+    fn observers(&self) -> &NamedAnyMap<dyn Observer> {
+        &self.observers
+    }
+
+    fn observers_mut(&mut self) -> &mut NamedAnyMap<dyn Observer> {
+        &mut self.observers
+    }
 }
 
 impl<I> InMemoryExecutor<I>
@@ -48,6 +55,7 @@ where
         }
         Self {
             harness: harness_fn,
+            observers: NamedAnyMap::new(),
         }
     }
 }
diff --git a/afl/src/executors/mod.rs b/afl/src/executors/mod.rs
index aaf98385b5..e17d13b146 100644
--- a/afl/src/executors/mod.rs
+++ b/afl/src/executors/mod.rs
@@ -1,8 +1,8 @@
 pub mod inmemory;
 
 use crate::inputs::Input;
-use crate::observers::Observer;
 use crate::metamap::NamedAnyMap;
+use crate::observers::Observer;
 use crate::AflError;
 
 pub enum ExitKind {
@@ -22,29 +22,33 @@ where
     fn run_target(&mut self, input: &I) -> Result<ExitKind, AflError>;
 
     /// Get the linked observers
-    fn observers(&self) -> &NamedAnyMap;
+    fn observers(&self) -> &NamedAnyMap<dyn Observer>;
 
     /// Get the linked observers
-    fn observers_mut(&mut self) -> &mut NamedAnyMap;
+    fn observers_mut(&mut self) -> &mut NamedAnyMap<dyn Observer>;
 
     /// Add a linked observer
-    fn add_observer(&mut self, observer: Box<dyn Observer>, name: &'static str) {
-        self.observers_mut().push(observer);
+    fn add_observer(&mut self, observer: Box<dyn Observer>) {
+        self.observers_mut().insert(observer, observer.name());
     }
 
     /// Reset the state of all the observes linked to this executor
     fn reset_observers(&mut self) -> Result<(), AflError> {
-        for observer in self.observers_mut() {
-            observer.reset()?;
+        for typeid in self.observers().all_typeids() {
+            for observer in self.observers_mut().all_by_typeid_mut(typeid).unwrap() {
+                observer.reset()?;
+            }
         }
         Ok(())
     }
 
     /// Run the post exec hook for all the observes linked to this executor
     fn post_exec_observers(&mut self) -> Result<(), AflError> {
-        self.observers_mut()
-            .iter()
-            .map(|x| x.post_exec())
-            .fold(Ok(()), |acc, x| if x.is_err() { x } else { acc })
+        for typeid in self.observers().all_typeids() {
+            for observer in self.observers_mut().all_by_typeid_mut(typeid).unwrap() {
+                observer.post_exec()?;
+            }
+        }
+        Ok(())
     }
 }
diff --git a/afl/src/feedbacks/mod.rs b/afl/src/feedbacks/mod.rs
index c3cb878b80..7fe07f7efd 100644
--- a/afl/src/feedbacks/mod.rs
+++ b/afl/src/feedbacks/mod.rs
@@ -7,6 +7,7 @@ use num::Integer;
 use serde::{Deserialize, Serialize};
 
 use crate::corpus::{Testcase, TestcaseMetadata};
+use crate::executors::Executor;
 use crate::inputs::Input;
 use crate::observers::MapObserver;
 use crate::serde_anymap::SerdeAny;
@@ -17,7 +18,7 @@ where
     I: Input,
 {
     /// is_interesting should return the "Interestingness" from 0 to 255 (percent times 2.55)
-    fn is_interesting(&mut self, input: &I) -> Result<u32, AflError>;
+    fn is_interesting(&mut self, input: &I, executor: &dyn Executor<I>) -> Result<u32, AflError>;
 
     /// Append to the testcase the generated metadata in case of a new corpus item
     fn append_metadata(&mut self, _testcase: &mut Testcase<I>) -> Result<(), AflError> {
@@ -28,6 +29,8 @@ where
     fn discard_metadata(&mut self, _input: &I) -> Result<(), AflError> {
         Ok(())
     }
+
+    fn name(&self) -> &'static str;
 }
 
 /// A Reducer function is used to aggregate values for the novelty search
@@ -78,16 +81,6 @@ where
     }
 }
 
-/// Returns a usable history map of the given size
-pub fn create_history_map<T>(map_size: usize) -> Rc<RefCell<Vec<T>>>
-where
-    T: Default + Clone,
-{
-    {
-        Rc::new(RefCell::new(vec![T::default(); map_size]))
-    }
-}
-
 /// The most common AFL-like feedback type
 pub struct MapFeedback<T, R, O>
 where
@@ -96,11 +89,11 @@ where
     O: MapObserver<T>,
 {
     /// Contains information about untouched entries
-    history_map: Rc<RefCell<Vec<T>>>,
-    /// The observer this feedback struct observes
-    map_observer: Rc<RefCell<O>>,
+    history_map: Vec<T>,
+    /// Name identifier of this instance
+    name: &'static str,
     /// Phantom Data of Reducer
-    phantom: PhantomData<R>,
+    phantom: PhantomData<(R, O)>,
 }
 
 impl<T, R, O, I> Feedback<I> for MapFeedback<T, R, O>
@@ -110,9 +103,8 @@ where
     O: MapObserver<T>,
     I: Input,
 {
-    fn is_interesting(&mut self, _input: &I) -> Result<u32, AflError> {
+    fn is_interesting(&mut self, _input: &I, executor: &dyn Executor<I>) -> Result<u32, AflError> {
         let mut interesting = 0;
-
         // TODO optimize
         let size = self.map_observer.borrow().map().len();
         let mut history_map = self.history_map.borrow_mut();
@@ -129,6 +121,10 @@ where
 
         Ok(interesting)
     }
+
+    fn name(&self) -> &'static str {
+        self.name
+    }
 }
 
 impl<T, R, O> MapFeedback<T, R, O>
@@ -137,11 +133,11 @@ where
     R: Reducer<T>,
     O: MapObserver<T>,
 {
-    /// Create new MapFeedback using a map observer
-    pub fn new(map_observer: Rc<RefCell<O>>, map_size: usize) -> Self {
+    /// Create new MapFeedback
+    pub fn new(name: &'static str, map_size: usize) -> Self {
         Self {
-            map_observer: map_observer,
-            history_map: create_history_map::<T>(map_size),
+            history_map: vec![T::default(); map_size],
+            name: name,
             phantom: PhantomData,
         }
     }
@@ -155,13 +151,10 @@ where
 {
     /// Create new MapFeedback using a map observer, and a map.
     /// The map can be shared.
-    pub fn with_history_map(
-        map_observer: Rc<RefCell<O>>,
-        history_map: Rc<RefCell<Vec<T>>>,
-    ) -> Self {
+    pub fn with_history_map(name: &'static str, history_map: Vec<T>) -> Self {
         Self {
-            map_observer: map_observer,
             history_map: history_map,
+            name: name,
             phantom: PhantomData,
         }
     }
@@ -206,11 +199,11 @@ where
     O: MapObserver<T>,
 {
     /// Contains information about untouched entries
-    history_map: Rc<RefCell<Vec<T>>>,
-    /// The observer this feedback struct observes
-    map_observer: Rc<RefCell<O>>,
+    history_map: Vec<T>,
+    /// Name identifier of this instance
+    name: &'static str,
     /// Phantom Data of Reducer
-    phantom: PhantomData<R>,
+    phantom: PhantomData<(R, O)>,
     /// Track novel entries indexes
     novelties: Vec<usize>,
 }
@@ -254,6 +247,10 @@ where
         self.novelties.clear();
         Ok(())
     }
+
+    fn name(&self) -> &'static str {
+        self.name
+    }
 }
 
 impl<T, R, O> MapTrackerFeedback<T, R, O>
diff --git a/afl/src/metamap.rs b/afl/src/metamap.rs
index 979e641fcf..42d5dc23c1 100644
--- a/afl/src/metamap.rs
+++ b/afl/src/metamap.rs
@@ -2,7 +2,7 @@ use alloc::boxed::Box;
 use alloc::vec::Vec;
 use core::any::{Any, TypeId};
 use core::slice::{Iter, IterMut};
-use hashbrown::hash_map::{Values, ValuesMut};
+use hashbrown::hash_map::{Keys, Values, ValuesMut};
 use hashbrown::HashMap;
 
 pub struct MetaMap {
@@ -241,11 +241,22 @@ impl MetaInstanceMap {
     }
 }
 
-pub struct NamedAnyMap {
-    map: HashMap<TypeId, HashMap<&'static str, Box<dyn Any>>>,
+pub trait AsAny {
+    fn as_any(&self) -> &dyn Any;
+    fn as_any_mut(&mut self) -> &mut dyn Any;
 }
 
-impl NamedAnyMap {
+pub struct NamedAnyMap<B>
+where
+    B: ?Sized + Any + AsAny,
+{
+    map: HashMap<TypeId, HashMap<&'static str, Box<B>>>,
+}
+
+impl<B> NamedAnyMap<B>
+where
+    B: ?Sized + Any + AsAny,
+{
     pub fn get<T>(&self, name: &'static str) -> Option<&T>
     where
         T: Any,
@@ -254,7 +265,14 @@ impl NamedAnyMap {
             None => None,
             Some(h) => h
                 .get(&name)
-                .map(|x| x.as_ref().downcast_ref::<T>().unwrap()),
+                .map(|x| x.as_any().downcast_ref::<T>().unwrap()),
+        }
+    }
+
+    pub fn by_typeid(&self, name: &'static str, typeid: &TypeId) -> Option<&B> {
+        match self.map.get(typeid) {
+            None => None,
+            Some(h) => h.get(&name).map(|x| x.as_ref()),
         }
     }
 
@@ -266,27 +284,42 @@ impl NamedAnyMap {
             None => None,
             Some(h) => h
                 .get_mut(&name)
-                .map(|x| x.as_mut().downcast_mut::<T>().unwrap()),
+                .map(|x| x.as_any_mut().downcast_mut::<T>().unwrap()),
+        }
+    }
+
+    pub fn by_typeid_mut(&mut self, name: &'static str, typeid: &TypeId) -> Option<&mut B> {
+        match self.map.get_mut(typeid) {
+            None => None,
+            Some(h) => h.get(&name).map(|x| x.as_mut()),
         }
     }
 
     pub fn get_all<T>(
         &self,
-    ) -> Option<core::iter::Map<Values<'_, &'static str, Box<dyn Any>>, fn(&Box<dyn Any>) -> &T>>
+    ) -> Option<core::iter::Map<Values<'_, &'static str, Box<B>>, fn(&Box<B>) -> &T>>
     where
         T: Any,
     {
         match self.map.get(&TypeId::of::<T>()) {
             None => None,
-            Some(h) => Some(h.values().map(|x| x.as_ref().downcast_ref::<T>().unwrap())),
+            Some(h) => Some(h.values().map(|x| x.as_any().downcast_ref::<T>().unwrap())),
+        }
+    }
+
+    pub fn all_by_typeid(
+        &self,
+        typeid: &TypeId,
+    ) -> Option<core::iter::Map<Values<'_, &'static str, Box<B>>, fn(&Box<B>) -> &B>> {
+        match self.map.get(typeid) {
+            None => None,
+            Some(h) => Some(h.values().map(|x| x.as_ref())),
         }
     }
 
     pub fn get_all_mut<T>(
         &mut self,
-    ) -> Option<
-        core::iter::Map<ValuesMut<'_, &'static str, Box<dyn Any>>, fn(&mut Box<dyn Any>) -> &mut T>,
-    >
+    ) -> Option<core::iter::Map<ValuesMut<'_, &'static str, Box<B>>, fn(&mut Box<B>) -> &mut T>>
     where
         T: Any,
     {
@@ -294,23 +327,32 @@ impl NamedAnyMap {
             None => None,
             Some(h) => Some(
                 h.values_mut()
-                    .map(|x| x.as_mut().downcast_mut::<T>().unwrap()),
+                    .map(|x| x.as_any_mut().downcast_mut::<T>().unwrap()),
             ),
         }
     }
 
-    pub fn insert<T>(&mut self, t: T, name: &'static str)
-    where
-        T: Any,
+    pub fn all_by_typeid_mut(
+        &mut self,
+        typeid: &TypeId,
+    ) -> Option<core::iter::Map<ValuesMut<'_, &'static str, Box<B>>, fn(&mut Box<B>) -> &mut B>>
     {
-        let typeid = TypeId::of::<T>();
+        match self.map.get_mut(typeid) {
+            None => None,
+            Some(h) => Some(h.values_mut().map(|x| x.as_mut())),
+        }
+    }
+
+    pub fn all_typeids(&self) -> Keys<'_, TypeId, HashMap<&'static str, Box<B>>> {
+        self.map.keys()
+    }
+
+    pub fn insert(&mut self, val: Box<B>, name: &'static str) {
+        let typeid = val.type_id();
         if !self.map.contains_key(&typeid) {
             self.map.insert(typeid, HashMap::default());
         }
-        self.map
-            .get_mut(&typeid)
-            .unwrap()
-            .insert(name, Box::new(t));
+        self.map.get_mut(&typeid).unwrap().insert(name, val);
     }
 
     pub fn len(&self) -> usize {
diff --git a/afl/src/observers/mod.rs b/afl/src/observers/mod.rs
index f790e6a15e..54ae4097e4 100644
--- a/afl/src/observers/mod.rs
+++ b/afl/src/observers/mod.rs
@@ -1,16 +1,15 @@
 extern crate num;
 
-use alloc::rc::Rc;
-use core::cell::RefCell;
-use core::slice::from_raw_parts_mut;
 use core::any::Any;
+use core::slice::from_raw_parts_mut;
 use num::Integer;
 
+use crate::metamap::AsAny;
 use crate::AflError;
 
 /// Observers observe different information about the target.
 /// They can then be used by various sorts of feedback.
-pub trait Observer: Any {
+pub trait Observer: Any + AsAny {
     fn flush(&mut self) -> Result<(), AflError> {
         Ok(())
     }
@@ -20,6 +19,8 @@ pub trait Observer: Any {
     fn post_exec(&mut self) -> Result<(), AflError> {
         Ok(())
     }
+
+    fn name(&self) -> &'static str;
 }
 
 /// A MapObserver observes the static map, as oftentimes used for afl-like coverage information
@@ -52,24 +53,41 @@ where
     }
 }
 
-pub struct StdMapObserver<'a, T>
+pub struct StdMapObserver<T>
 where
-    T: Integer + Copy,
+    T: Integer + Copy + 'static,
 {
-    map: &'a mut [T],
+    map: &'static mut [T],
     initial: T,
+    name: &'static str,
 }
 
-impl<'a, T> Observer for StdMapObserver<'a, T>
+impl<T> Observer for StdMapObserver<T>
 where
     T: Integer + Copy,
 {
     fn reset(&mut self) -> Result<(), AflError> {
         self.reset_map()
     }
+
+    fn name(&self) -> &'static str {
+        self.name
+    }
 }
 
-impl<'a, T> MapObserver<T> for StdMapObserver<'a, T>
+impl<T> AsAny for StdMapObserver<T>
+where
+    T: Integer + Copy,
+{
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+    fn as_any_mut(&mut self) -> &mut dyn Any {
+        self
+    }
+}
+
+impl<T> MapObserver<T> for StdMapObserver<T>
 where
     T: Integer + Copy,
 {
@@ -94,36 +112,29 @@ where
     }
 }
 
-impl<'a, T> StdMapObserver<'a, T>
+impl<T> StdMapObserver<T>
 where
     T: Integer + Copy,
 {
     /// Creates a new MapObserver
-    pub fn new(map: &'a mut [T]) -> Self {
+    pub fn new(name: &'static str, map: &'static mut [T]) -> Self {
         let initial = if map.len() > 0 { map[0] } else { T::zero() };
         Self {
             map: map,
             initial: initial,
+            name: name,
         }
     }
 
     /// Creates a new MapObserver from a raw pointer
-    pub fn new_from_ptr(map_ptr: *mut T, len: usize) -> Self {
+    pub fn new_from_ptr(name: &'static str, map_ptr: *mut T, len: usize) -> Self {
         unsafe {
             let initial = if len > 0 { *map_ptr } else { T::zero() };
             StdMapObserver {
                 map: from_raw_parts_mut(map_ptr, len),
                 initial: initial,
+                name: name,
             }
         }
     }
 }
-
-impl<'a, T> Into<Rc<RefCell<Self>>> for StdMapObserver<'a, T>
-where
-    T: Integer + Copy,
-{
-    fn into(self) -> Rc<RefCell<Self>> {
-        Rc::new(RefCell::new(self))
-    }
-}