snes-reset the libsnes core (with whatever serious re-initialization logic we've currently written in libsnes) every time loadstate occurs; and add memsetting to that re-initialization logic, under the theory that if there is a savestate nondeterminism due to fundamental serialization bugs, at least loadstates will be deterministically buggy, decreasing the odds that anyone will ever notice them. of course, i would rather increase the odds that we'll notice them to 100%, so we can fix them, instead of just masking them. but i don't make the rules, i just stfu the nags

BizHawk.Emulation/Consoles/Nintendo/SNES/LibsnesCore.cs

@@ -951,7 +951,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
 		{
 			int size = LibsnesDll.snes_serialize_size();
 			if (data.Length != size)
-				throw new Exception("Libsnes internal savestate size mismatch!");		
+				throw new Exception("Libsnes internal savestate size mismatch!");
+			LibsnesDll.snes_init();
 			fixed (byte* pbuf = &data[0])
 				LibsnesDll.snes_unserialize(new IntPtr(pbuf), size);
 		}

libsnes/bsnes/target-libsnes/libsnes.cpp

@@ -161,6 +161,7 @@ void snes_set_cartridge_basename(const char *basename) {
 
 template<typename T> inline void reconstruct(T* t) { 
 	t->~T();
+	memset(t,0,sizeof(*t));
 	new(t) T();
 }