ocfs2: dump lockres info before we BUG() on a bad reference

Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 9c5ef405bb39..427c0af0d219 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -619,6 +619,28 @@ static void dlm_lockres_release(struct kref *kref)
         mlog(0, "destroying lockres %.*s\n", res->lockname.len,
              res->lockname.name);
 
+        if (!hlist_unhashed(&res->hash_node) ||
+            !list_empty(&res->granted) ||
+            !list_empty(&res->converting) ||
+            !list_empty(&res->blocked) ||
+            !list_empty(&res->dirty) ||
+            !list_empty(&res->recovering) ||
+            !list_empty(&res->purge)) {
+                mlog(ML_ERROR,
+                     "Going to BUG for resource %.*s."
+                     "  We're on a list! [%c%c%c%c%c%c%c]\n",
+                     res->lockname.len, res->lockname.name,
+                     !hlist_unhashed(&res->hash_node) ? 'H' : ' ',
+                     !list_empty(&res->granted) ? 'G' : ' ',
+                     !list_empty(&res->converting) ? 'C' : ' ',
+                     !list_empty(&res->blocked) ? 'B' : ' ',
+                     !list_empty(&res->dirty) ? 'D' : ' ',
+                     !list_empty(&res->recovering) ? 'R' : ' ',
+                     !list_empty(&res->purge) ? 'P' : ' ');
+
+                dlm_print_one_lock_resource(res);
+        }
+
         /* By the time we're ready to blow this guy away, we shouldn't
          * be on any lists. */
         BUG_ON(!hlist_unhashed(&res->hash_node));