Avoid weird named fifo race condition in tracediff.
diff --git a/scripts/tracediff.py b/scripts/tracediff.py
index 7237da0..f4f86e3 100755
--- a/scripts/tracediff.py
+++ b/scripts/tracediff.py
@@ -32,6 +32,7 @@
 import subprocess
 import sys
 import tempfile
+import time
 
 
 def stripdump(trace, fifo):
@@ -60,6 +61,9 @@
         universal_newlines = True,
     )
 
+    # XXX: Avoid a weird race condition
+    time.sleep(0.01)
+
 
 def diff(traces):
     fifodir = tempfile.mkdtemp()