Comment 4 for bug 896728

The problem persists despite my last impressions: Here's a longer backlog with verbosity=5:

Error accessing possibly locked file /lost+found
Error accessing possibly locked file /root
Cleanup of temporary file /home/$USER/.cache/deja-dup/b46a916b73394f83c5a77cd450ead9b9/duplicity-u2A9yE-tempdir/mktemp-tzl_EL-1 failed
Cleanup of temporary file /home/$USER/.cache/deja-dup/b46a916b73394f83c5a77cd450ead9b9/duplicity-8Ihkbv-tempdir/mktemp-P253Cq-1 failed
AsyncScheduler: running task synchronously (asynchronicity disabled)
Writing sftp://backup@HOST/mnt/backup/duplicity-inc.20111212T004634Z.to.20111212T182905Z.vol1.difftar.gpg
Deleting /tmp/duplicity-TlYUdU-tempdir/mktemp-3qPCXA-3
AsyncScheduler: task completed successfully
Processed volume 1
Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1377, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1370, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1352, in main
    incremental_backup(sig_chain)
  File "/usr/bin/duplicity", line 575, in incremental_backup
    new_sig_outfp.to_remote()
  File "/usr/lib/python2.7/site-packages/duplicity/dup_temp.py", line 181, in to_remote
    gpg.GPGWriteFile(src_iter, tgt.name, globals.gpg_profile, size = sys.maxint)
  File "/usr/lib/python2.7/site-packages/duplicity/gpg.py", line 313, in GPGWriteFile
    file = GPGFile(True, path.Path(filename), profile)
  File "/usr/lib/python2.7/site-packages/duplicity/gpg.py", line 143, in __init__
    'logger': self.logger_fp})
  File "/usr/lib/python2.7/site-packages/duplicity/GnuPGInterface.py", line 365, in run
    create_fhs, attach_fhs)
  File "/usr/lib/python2.7/site-packages/duplicity/GnuPGInterface.py", line 407, in _attach_fork_exec
    process.pid = os.fork()
OSError: [Errno 12] Cannot allocate memory