Index: Lib/os.py
===================================================================
--- Lib/os.py	(révision 80889)
+++ Lib/os.py	(copie de travail)
@@ -355,7 +355,14 @@
         return
     last_exc = saved_exc = None
     saved_tb = None
-    for dir in get_exec_path(env):
+    path_list = get_exec_path(env)
+    if name != "nt":
+        if isinstance(file, str):
+            file = file.encode(sys.getfilesystemencoding(), 'surrogateescape')
+        path_list = (
+            dir.encode(sys.getfilesystemencoding(), 'surrogateescape')
+            for dir in path_list)
+    for dir in path_list:
         fullname = path.join(dir, file)
         try:
             exec_func(fullname, *argrest)
Index: Lib/test/test_subprocess.py
===================================================================
--- Lib/test/test_subprocess.py	(révision 80889)
+++ Lib/test/test_subprocess.py	(copie de travail)
@@ -825,7 +825,21 @@
             stdout = stdout.rstrip(b'\n\r')
             self.assertEquals(stdout.decode('ascii'), repr(value))
 
+    def test_bytes_program(self):
+        def fs_encode(filename):
+            return filename.encode(sys.getfilesystemencoding(), "surrogateescape")
 
+        # bytes program, unicode PATH
+        path, program = os.path.split(sys.executable)
+        program = fs_encode(program)
+        env = os.environ.copy()
+        env["PATH"] = path
+        exitcode = subprocess.call(
+            [program, "-c", "pass"],
+            env=env)
+        self.assertEquals(exitcode, 0)
+
+
 @unittest.skipUnless(mswindows, "Windows specific tests")
 class Win32ProcessTestCase(BaseTestCase):
 
Index: Lib/subprocess.py
===================================================================
--- Lib/subprocess.py	(révision 80889)
+++ Lib/subprocess.py	(copie de travail)
@@ -1102,10 +1102,10 @@
                         else:
                             # This matches the behavior of os._execvpe().
                             path_list = os.get_exec_path(env)
-                            executable_list = (os.path.join(dir, executable)
-                                               for dir in path_list)
-                            executable_list = tuple(fs_encode(exe)
-                                                    for exe in executable_list)
+                            executable = fs_encode(executable)
+                            executable_list = tuple(
+                                os.path.join(fs_encode(dir), executable)
+                                for dir in path_list)
                         self.pid = _posixsubprocess.fork_exec(
                                 args, executable_list,
                                 close_fds, cwd, env_list,