added recursion limit for stats gathering, sometimes it did >1000 loops which lead to python throwing max recursion depth exceeded error.

ref  #642

rhodecode/controllers/summary.py

@@ -140,7 +140,9 b' class SummaryController(BaseRepoControll'
         if dbrepo.enable_statistics:
             c.show_stats = True
             c.no_data_msg = _('No data loaded yet')
-            run_task(get_commits_stats, c.dbrepo.repo_name, ts_min_y, ts_max_y)
+            recurse_limit = 500  # don't recurse more than 500 times when parsing
+            run_task(get_commits_stats, c.dbrepo.repo_name, ts_min_y,
+                     ts_max_y, recurse_limit)
         else:
             c.show_stats = False
             c.no_data_msg = _('Statistics are disabled for this repository')

rhodecode/lib/celerylib/tasks.py

@@ -87,7 +87,7 b' def whoosh_index(repo_location, full_ind'
 
 @task(ignore_result=True)
 @dbsession
-def get_commits_stats(repo_name, ts_min_y, ts_max_y):
+def get_commits_stats(repo_name, ts_min_y, ts_max_y, recurse_limit=100):
     log = get_logger(get_commits_stats)
     DBS = get_session()
     lockkey = __get_lockkey('get_commits_stats', repo_name, ts_min_y,
@@ -240,8 +240,12 b' def get_commits_stats(repo_name, ts_min_'
         lock.release()
 
         # execute another task if celery is enabled
-        if len(repo.revisions) > 1 and CELERY_ON:
-            run_task(get_commits_stats, repo_name, ts_min_y, ts_max_y)
+        if len(repo.revisions) > 1 and CELERY_ON and recurse_limit > 0:
+            recurse_limit -= 1
+            run_task(get_commits_stats, repo_name, ts_min_y, ts_max_y,
+                     recurse_limit)
+        if recurse_limit <= 0:
+            log.debug('Breaking recursive mode due to reach of recurse limit')
         return True
     except LockHeld:
         log.info('LockHeld')