diff --git a/poky/bitbake/lib/bb/server/process.py b/poky/bitbake/lib/bb/server/process.py
index 28b8eb9..80a7875 100644
--- a/poky/bitbake/lib/bb/server/process.py
+++ b/poky/bitbake/lib/bb/server/process.py
@@ -499,6 +499,7 @@
                 except IOError as e:
                     if e.errno == errno.EWOULDBLOCK:
                         pass
+                    raise
         finally:
             os.chdir(cwd)