Fix errors on python3

src/python/bcc/__init__.py

@@ -72,7 +72,7 @@ class KernelSymbolCache(object):
         psym = ct.pointer(sym)
         if lib.bcc_symcache_resolve(self.cache, addr, psym) < 0:
             return "[unknown]", 0
-        return sym.name, sym.offset
+        return sym.name.decode(), sym.offset
 
     def resolve_name(self, name):
         addr = ct.c_ulonglong()
@@ -437,11 +437,12 @@ class BPF(object):
     def _check_path_symbol(cls, module, symname, addr):
         sym = bcc_symbol()
         psym = ct.pointer(sym)
-        if lib.bcc_resolve_symname(module, symname, addr or 0x0, psym) < 0:
+        if lib.bcc_resolve_symname(module.encode("ascii"),
+                symname.encode("ascii"), addr or 0x0, psym) < 0:
             if not sym.module:
                 raise Exception("could not find library %s" % module)
             raise Exception("could not determine address of symbol %s" % symname)
-        return sym.module, sym.offset
+        return sym.module.decode(), sym.offset
 
     @staticmethod
     def find_library(libname):

tests/python/test_stackid.py

@@ -47,7 +47,7 @@ int kprobe__htab_map_lookup_elem(struct pt_regs *ctx, struct bpf_map *map, u64 *
         stackid = stack_entries[k]
         self.assertIsNotNone(stackid)
         stack = stack_traces[stackid].ip
-        self.assertEqual(b.ksym(stack[0]), "htab_map_lookup_elem")
+        self.assertEqual(b.ksym(stack[0]), b"htab_map_lookup_elem")
 
 
 if __name__ == "__main__":