Testing rauhryan/huboard gets hung up.  Running taskd manually and hitting ctrl-c let me see where it was at that point in time:
  File "/home/dbrondsema/dbrondsema-1019/forge/ForgeImporters/forgeimporters/base.py", line 122, in import_tool
    mount_point=mount_point, mount_label=mount_label, **kw)
  File "/home/dbrondsema/dbrondsema-1019/forge/ForgeImporters/forgeimporters/github/tracker.py", line 131, in import_tool
    self.process_comments(extractor, ticket, issue)
  File "/home/dbrondsema/dbrondsema-1019/forge/ForgeImporters/forgeimporters/github/tracker.py", line 182, in process_comments
    body, attachments = self._get_attachments(comment['body'])
  File "/home/dbrondsema/dbrondsema-1019/forge/ForgeImporters/forgeimporters/github/tracker.py", line 256, in _get_attachments
    for i, match in enumerate(found_matches):
  File "/var/local/env-allura/lib/python2.7/site-packages/async-0.6.1-py2.7-linux-x86_64.egg/async/__init__.py", line 20, in thread_interrupt_handler
    prev_handler(signum, frame)
KeyboardInterrupt
https://github.com/rauhryan/huboard/issues/48#issuecomment-5396859 is consistently the last comment to be saved to mongo. So something in the next one?
Closed #501.
je/42cc_6922Fixed that error (and couple of others along the way) on that repo.
Encountered other bug - imported attachments doesn't attach to comments (at least, they're not displayed on UI). Tested in master branch. I think you need another ticket for that.