If you stash away jtreg test results in a specific JTwork directory this can causes problem creating a jib source bundle. Simple fix is to add a wildcard to the JTwork and JTreport exclude entries:

diff --git a/make/conf/jib-profiles.js b/make/conf/jib-profiles.js
index df2241b259d..b254cbe0cd8 100644
--- a/make/conf/jib-profiles.js
+++ b/make/conf/jib-profiles.js
@@ -205,7 +205,7 @@ var getJibProfiles = function (input) {
 
     // Exclude list to use when Jib creates a source bundle
     data.src_bundle_excludes = [
- "build", "{,**/}webrev*", "{,**/}.hg", "{,**/}JTwork", "{,**/}JTreport",
+ "build", "{,**/}webrev*", "{,**/}.hg", "{,**/}JTwork*", "{,**/}JTreport*",
         "{,**/}.git"
     ];
     // Include list to use when creating a minimal jib source bundle which