diff --git a/lgtm.yml b/lgtm.yml
new file mode 100644
index 00000000..821793e5
--- /dev/null
+++ b/lgtm.yml
@@ -0,0 +1,6 @@
+queries:
+  - exclude: py/clear-text-logging-sensitive-data
+
+path_classifiers:
+  examples:
+    - examples/
diff --git a/manticore/core/plugin.py b/manticore/core/plugin.py
index df8356fc..18e780ee 100644
--- a/manticore/core/plugin.py
+++ b/manticore/core/plugin.py
@@ -129,7 +129,6 @@ class ExtendedTracer(Plugin):
     def did_write_memory_callback(self, state, where, value, size):
         if self.current_pc == where:
             raise Exception
-            return
 
         entry = {"type": "mem_write", "where": where, "value": value, "size": size}
         state.context.setdefault(self.context_key, []).append(entry)
diff --git a/manticore/core/smtlib/constraints.py b/manticore/core/smtlib/constraints.py
index dbbc1802..37240996 100644
--- a/manticore/core/smtlib/constraints.py
+++ b/manticore/core/smtlib/constraints.py
@@ -326,7 +326,7 @@ class ConstraintSet:
                         name=migrated_name,
                     ).array
                 else:
-                    raise NotImplemented(
+                    raise NotImplementedError(
                         f"Unknown expression type {type(foreign_var)} encountered during expression migration"
                     )
                 # Update the var to var mapping
diff --git a/manticore/core/smtlib/solver.py b/manticore/core/smtlib/solver.py
index ec77e474..c6f23436 100644
--- a/manticore/core/smtlib/solver.py
+++ b/manticore/core/smtlib/solver.py
@@ -274,7 +274,6 @@ class Z3Solver(Solver):
             # self._proc.wait()
         except Exception as e:
             logger.error(str(e))
-            pass
 
     def _reset(self, constraints=None):
         """Auxiliary method to reset the smtlib external solver to initial defaults"""
diff --git a/manticore/core/state.py b/manticore/core/state.py
index b3623f72..d5a8927d 100644
--- a/manticore/core/state.py
+++ b/manticore/core/state.py
@@ -61,7 +61,7 @@ class SerializeState(Concretize):
         disk so that analysis can later be resumed from this point.
     """
 
-    def setstate(self, state, _value):
+    def _setstate(self, state, _value):
         with open(self.filename, "wb") as statef:
             PickleSerializer().serialize(state, statef)
 
@@ -69,7 +69,7 @@ class SerializeState(Concretize):
         super().__init__(
             f"Saving state to {filename}",
             BitVecConstant(32, 0),
-            setstate=self.setstate,
+            setstate=self._setstate,
             policy="ONE",
             **kwargs,
         )
diff --git a/manticore/ethereum/abi.py b/manticore/ethereum/abi.py
index 710973c2..dfbcab45 100644
--- a/manticore/ethereum/abi.py
+++ b/manticore/ethereum/abi.py
@@ -264,7 +264,7 @@ class ABI:
                 result.append(ABI._deserialize(ty[2], buf, dyn_offset))
                 dyn_offset += ty_size
         else:
-            raise NotImplemented
+            raise NotImplementedError(f"Could not deserialize type: {ty[0]}")
 
         return result
 
diff --git a/manticore/ethereum/manticore.py b/manticore/ethereum/manticore.py
index 43f7302e..5bc7c650 100644
--- a/manticore/ethereum/manticore.py
+++ b/manticore/ethereum/manticore.py
@@ -513,7 +513,7 @@ class ManticoreEVM(ManticoreBase):
             for _ in range(rep):
                 result.append(self._make_symbolic_arguments(ty[2]))
         else:
-            raise NotImplemented
+            raise NotImplementedError(f"Could not produce symbolic argument of type {ty[0]}")
 
         return result
 
diff --git a/manticore/native/cpu/aarch64.py b/manticore/native/cpu/aarch64.py
index 139b8a0d..2957c5fb 100644
--- a/manticore/native/cpu/aarch64.py
+++ b/manticore/native/cpu/aarch64.py
@@ -2837,9 +2837,7 @@ class Aarch64Cpu(Cpu):
         insn_rx += "1{5}"
 
         assert re.match(insn_rx, cpu.insn_bit_str)
-
         # XXX: Assumes sequential execution.
-        pass
 
     # XXX: Support DUP (element).
     @instruction
diff --git a/manticore/native/cpu/arm.py b/manticore/native/cpu/arm.py
index 0def2f98..6d87aea8 100644
--- a/manticore/native/cpu/arm.py
+++ b/manticore/native/cpu/arm.py
@@ -4,6 +4,7 @@ import logging
 import struct
 
 import capstone as cs
+import operator as ops
 
 from .abstractcpu import Abi, Cpu, Interruption, Operand, RegisterFile, SyscallAbi
 from .abstractcpu import instruction as abstract_instruction
@@ -763,8 +764,8 @@ class Armv7Cpu(Cpu):
                 return "ASR"
         return OP_NAME_MAP.get(name, name)
 
-    def _wrap_operands(self, ops):
-        return [Armv7Operand(self, op) for op in ops]
+    def _wrap_operands(self, operands):
+        return [Armv7Operand(self, op) for op in operands]
 
     def should_commit_flags(cpu):
         # workaround for a capstone bug (issue #980);
@@ -1515,7 +1516,8 @@ class Armv7Cpu(Cpu):
             op2_val, carry = op2.read(with_carry=True)
             result = operation(op1.read(), op2_val)
         else:
-            op1_val, carry = op1.read(with_carry=True)
+            # We _do_ use this form, contrary to what LGTM says
+            op1_val, carry = op1.read(with_carry=True)  # lgtm [py/call/wrong-arguments]
             result = operation(op1_val)
         if dest is not None:
             dest.write(result)
@@ -1524,9 +1526,9 @@ class Armv7Cpu(Cpu):
     @instruction(can_take_denormalized_mod_imm=True)
     def ORR(cpu, dest, op1, op2=None):
         if op2 is not None:
-            cpu._bitwise_instruction(lambda x, y: x | y, dest, op1, op2)
+            cpu._bitwise_instruction(ops.or_, dest, op1, op2)
         else:
-            cpu._bitwise_instruction(lambda x, y: x | y, dest, dest, op1)
+            cpu._bitwise_instruction(ops.or_, dest, dest, op1)
 
     @instruction(can_take_denormalized_mod_imm=True)
     def ORN(cpu, dest, op1, op2=None):
@@ -1538,20 +1540,20 @@ class Armv7Cpu(Cpu):
     @instruction(can_take_denormalized_mod_imm=True)
     def EOR(cpu, dest, op1, op2=None):
         if op2 is not None:
-            cpu._bitwise_instruction(lambda x, y: x ^ y, dest, op1, op2)
+            cpu._bitwise_instruction(ops.xor, dest, op1, op2)
         else:
-            cpu._bitwise_instruction(lambda x, y: x ^ y, dest, dest, op1)
+            cpu._bitwise_instruction(ops.xor, dest, dest, op1)
 
     @instruction(can_take_denormalized_mod_imm=True)
     def AND(cpu, dest, op1, op2=None):
         if op2 is not None:
-            cpu._bitwise_instruction(lambda x, y: x & y, dest, op1, op2)
+            cpu._bitwise_instruction(ops.and_, dest, op1, op2)
         else:
-            cpu._bitwise_instruction(lambda x, y: x & y, dest, dest, op1)
+            cpu._bitwise_instruction(ops.and_, dest, dest, op1)
 
     @instruction(can_take_denormalized_mod_imm=True)
     def TEQ(cpu, op1, op2=None):
-        cpu._bitwise_instruction(lambda x, y: x ^ y, None, op1, op2)
+        cpu._bitwise_instruction(ops.xor, None, op1, op2)
         cpu.commit_flags()
 
     @instruction(can_take_denormalized_mod_imm=True)
diff --git a/manticore/native/memory.py b/manticore/native/memory.py
index 761b4a9c..5ccc14e4 100644
--- a/manticore/native/memory.py
+++ b/manticore/native/memory.py
@@ -63,6 +63,7 @@ class ConcretizeMemory(MemoryException):
             self.message = f"Concretizing memory address {address} size {size}"
         else:
             self.message = message
+        super().__init__(self.message, address)
         self.mem = mem
         self.address = address
         self.size = size
diff --git a/manticore/platforms/decree.py b/manticore/platforms/decree.py
index 6fb8633f..130b4ce7 100644
--- a/manticore/platforms/decree.py
+++ b/manticore/platforms/decree.py
@@ -1082,12 +1082,8 @@ class SDecree(Decree):
 
         data = []
         for i in range(count):
-            if False:
-                # Too slow for the new age.
-                value = self.constraints.new_bitvec(8, name="RANDOM_%04d" % self.random)
-                self.constraints.add(symb == cgcrandom.stream[self.random])
-            else:
-                value = cgcrandom.stream[self.random]
+            # TODO - should value be symbolic?
+            value = cgcrandom.stream[self.random]
             data.append(value)
             self.random += 1
 
diff --git a/manticore/platforms/linux.py b/manticore/platforms/linux.py
index faab019c..357b5956 100644
--- a/manticore/platforms/linux.py
+++ b/manticore/platforms/linux.py
@@ -161,8 +161,11 @@ class File:
         return
 
 
-class ProcSelfMaps(File):
+# TODO - we should consider refactoring File so that we don't have to mute these errors
+class ProcSelfMaps(File):  # lgtm [py/missing-call-to-init]
     def __init__(self, flags: int, linux):
+        # WARN: Does not call File.__init__. Should have the File API, but we manually
+        # manage the underlying file and mode
         self.file = tempfile.NamedTemporaryFile(mode="w", delete=False)
         self.file.write(linux.current.memory.__proc_self__)
         self.file.close()
@@ -172,8 +175,10 @@ class ProcSelfMaps(File):
         self.file = open(self.file.name, mode)
 
 
-class Directory(File):
+class Directory(File):  # lgtm [py/missing-call-to-init]
     def __init__(self, path: str, flags: int):
+        # WARN: Does not call File.__init__ because we don't want to open the directory,
+        # even though we still want it to present the same API as File
         assert os.path.isdir(path)
 
         self.fd = os.open(path, flags)
diff --git a/manticore/wasm/executor.py b/manticore/wasm/executor.py
index 7bc14c98..ccb2ef5f 100644
--- a/manticore/wasm/executor.py
+++ b/manticore/wasm/executor.py
@@ -1454,8 +1454,8 @@ class Executor(Eventful):
             stack.push(F32.cast(c1))
             return
         raise NotImplementedError("f32_demote_f64")
-        c1 = struct.unpack("f", struct.pack("d", c1)[:4])[0]
-        stack.push(F32.cast(c1))
+        # c1 = struct.unpack("f", struct.pack("d", c1)[:4])[0]
+        # stack.push(F32.cast(c1))
 
     def f64_convert_s_i32(self, store, stack):
         stack.has_type_on_top(I32, 1)
diff --git a/manticore/wasm/structure.py b/manticore/wasm/structure.py
index 172d14c3..81ca79a7 100644
--- a/manticore/wasm/structure.py
+++ b/manticore/wasm/structure.py
@@ -1082,7 +1082,7 @@ class ModuleInstance(Eventful):
         ty = f.type
         assert len(ty.result_types) <= 1
         local_vars: typing.List[Value] = []
-        for v in [stack.pop() for _t in ty.param_types][::-1]:
+        for v in [stack.pop() for _ in ty.param_types][::-1]:
             assert not isinstance(v, (Label, Activation))
             local_vars.append(v)
 
@@ -1846,7 +1846,7 @@ class Stack(Eventful):
         raise RuntimeError("Couldn't find a frame on the stack")
 
 
-class AtomicStack(Stack):
+class AtomicStack(Stack):  # lgtm [py/missing-call-to-init]
     """
     Allows for the rolling-back of the stack in the event of a concretization exception.
     Inherits from Stack so that the types will be correct, but never calls `super`.
diff --git a/scripts/gdb.py b/scripts/gdb.py
index 6079353f..81b1c747 100644
--- a/scripts/gdb.py
+++ b/scripts/gdb.py
@@ -95,7 +95,6 @@ def getM(m):
         return int(correspond(f"x/xg {m}\n").strip().split("\t")[-1], 0)
     except Exception as e:
         raise e
-        return 0
 
 
 def getPid():
@@ -138,5 +137,5 @@ def get_arch():
         _arch = "armv7"
     else:
         print(infotarget)
-        raise NotImplemented
+        raise NotImplementedError
     return _arch
diff --git a/scripts/prof.py b/scripts/prof.py
index b77c76a2..3f1ef7f6 100644
--- a/scripts/prof.py
+++ b/scripts/prof.py
@@ -7,15 +7,19 @@ from __future__ import print_function
 from sys import argv, exit
 
 from manticore.native import Manticore
+from manticore.core.plugin import Profiler
 
 
 def profile(program, sort="cumulative"):
     print(f'[*] Profiling program "{program}"')
 
     m = Manticore(program)
-    m.run(should_profile=True)
+    profiler = Profiler()
+    m.register_plugin(profiler)
+    m.run()
+    m.finalize()
 
-    stats = m.get_profiling_stats()
+    stats = profiler.get_profiling_data()
     print(f"[*] Loaded profiling data.")
 
     if stats is None:
diff --git a/tests/auto_generators/make_dump.py b/tests/auto_generators/make_dump.py
index 269924f6..259342ad 100644
--- a/tests/auto_generators/make_dump.py
+++ b/tests/auto_generators/make_dump.py
@@ -158,7 +158,7 @@ def read_operand(o):
     elif o.type == X86_OP_REG:
         reg_name = str(instruction.reg_name(o.reg).upper())
         return gdb.getR(reg_name)
-    raise NotImplemented
+    raise NotImplementedError(f"Unknown operand typ: {o.type}")
 
 
 STACK_INSTRUCTIONS = [