Dead unbreakable bzr locks?

[Dmitry Antipov]

Although I see no locks:

$ bzr info bzr+ssh://address@hidden/emacs
Shared repository (format: unnamed)
Location:
  shared repository: bzr+ssh://address@hidden/emacs/

there is one:

$ bzr push
Using saved push location: bzr+ssh://address@hidden/emacs/trunk/
Unable to obtain lock  held by Dmitry Antipov <address@hidden> on 
vcs.savannah.gnu.org (process #29533), acquired 1 hour, 41 minutes ago.
See "bzr help break-lock" for more.
bzr: ERROR: Could not acquire lock "(remote lock)": 
bzr+ssh://address@hidden/emacs/

and I can't break it with 'bzr break-lock bzr+ssh://address@hidden/emacs',
even with --force.

This happens from time to time. Why, and how to avoid it?

Dmitry