RecursionError when embedding metadata into PDF

[Typhon]

I get the following error when trying to embed metadata into some PDF entries. I'm not sure which entries cause this or why. Will update with more information if I do.

calibre 6.11 embedded-python: True
Traceback (most recent call last):
  File "calibre/gui2/actions/embed.py", line 127, in do_one
  File "calibre/db/cache.py", line 77, in call_func_with_lock
  File "calibre/db/cache.py", line 2654, in embed_metadata
  File "calibre/db/cache.py", line 934, in get_metadata
  File "calibre/db/locking.py", line 281, in acquire
  File "calibre/db/locking.py", line 230, in acquire
  File "calibre/db/locking.py", line 100, in acquire
  File "calibre/db/locking.py", line 160, in _acquire_shared
RecursionError: maximum recursion depth exceeded

[Kovid Goyal (kovid)]

What actions are you taking to trigger this error?

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every alternate Friday.

 status fixreleased