tahoe backup sometimes fails

[vikarti]

Mac OS X 10.7 gateway,

mutable.format is set to mdmf

sometimes tahou backup process several files fine and later stops if it stops - it's always same place like this

skipping "/Users/vikarti/Calibre Library/Zooko Wilcox-O'Hearn_ Brian Warner/Tahoe - The Least-Authority Filesystem (1347)/Tahoe - The Least-Authority Filesystem - Zooko Wilcox-O'Hearn_ Brian Warner.pdf"..
 re-using old directory for "/Users/vikarti/Calibre Library/Zooko Wilcox-O'Hearn_ Brian Warner/Tahoe - The Least-Authority Filesystem (1347)"
 re-using old directory for "/Users/vikarti/Calibre Library/Zooko Wilcox-O'Hearn_ Brian Warner"
 re-using old directory for '/Users/vikarti/Calibre Library'
Traceback (most recent call last):
  File "/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/support/bin/tahoe", line 9, in <module>
    load_entry_point('allmydata-tahoe==1.9.1', 'console_scripts', 'tahoe')()
  File "/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/src/allmydata/scripts/runner.py", line 113, in run
    rc = runner(sys.argv[1:], install_node_control=install_node_control)
  File "/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/src/allmydata/scripts/runner.py", line 99, in runner
    rc = cli.dispatch[command](so)
  File "/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/src/allmydata/scripts/cli.py", line 569, in backup
    rc = tahoe_backup.backup(options)
  File "/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/src/allmydata/scripts/tahoe_backup.py", line 325, in backup
    return bu.run()
  File "/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/src/allmydata/scripts/tahoe_backup.py", line 123, in run
    put_child(archives_url, now, new_backup_dircap)
  File "/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/src/allmydata/scripts/tahoe_backup.py", line 57, in put_child
    raise HTTPError("Error during put_child", resp)
allmydata.scripts.common_http.HTTPError: Error during put_child: 500 Internal Server Error
"Traceback (most recent call last):
  File \"/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/base.py\", line 793, in runUntilCurrent
    call.func(*call.args, **call.kw)
  File \"/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/support/lib/python2.7/site-packages/foolscap-0.6.3-py2.7.egg/foolscap/eventual.py\", line 26, in _turn
    cb(*args, **kwargs)\x0a  File \"/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/defer.py\", line 361, in callback
    self._startRunCallbacks(result)\x0a  File \"/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/defer.py\", line 455, in _startRunCallbacks
    self._runCallbacks()
--- <exception caught here> ---
  File \"/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/defer.py\", line 542, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File \"/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/src/allmydata/mutable/filenode.py\", line 855, in <lambda>\x0a    self._modify_once(modifier, first_time))\x0a  File \"/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/src/allmydata/mutable/filenode.py\", line 881, in _modify_once
    d = self._try_to_download_data()
  File \"/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/src/allmydata/mutable/filenode.py\", line 959, in _try_to_download_data
    d = self._read(c, fetch_privkey=True)
  File \"/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/src/allmydata/mutable/filenode.py\", line 980, in _read
    d = r.download(consumer, offset, size)
  File \"/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/src/allmydata/mutable/retrieve.py\", line 237, in download
    self._setup_download()
  File \"/Users/vikarti/tahoe-new/allmydata-tahoe-1.9.1/src/allmydata/mutable/retrieve.py\", line 277, in _setup_download\x0a    shares = versionmap[self.verinfo]\x0aexceptions.KeyError: (5, '\\x11c\\x1c\\xf7\\xc9\\xae1e\\xa2\\xdaF\\xaf\\xb6S\\x03IH\\x84\\x11#\\xb5\\xf2TS\\xfb\\xde\\x08\\x81\\x01\\xf0\\xd3\\xec', None, 131073, 1080, 3, 10, '\\x01\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x05\\x11c\\x1c\\xf7\\xc9\\xae1e\\xa2\\xdaF\\xaf\\xb6S\\x03IH\\x84\\x11#\\xb5\\xf2TS\\xfb\\xde\\x08\\x81\\x01\\xf0\\xd3\\xec\\x03\\n\\x00\\x00\\x00\\x00\\x00\\x02\\x00\\x01\\x00\\x00\\x00\\x00\\x00\\x00\\x048', (('EOF', 2575), ('verification_key', 1729), ('enc_privkey', 123), ('share_data', 2167), ('signature', 1473), ('block_hash_tree', 2543), ('share_hash_chain', 1337), ('verification_key_end', 2021)))\x0a"

[vikarti]

possible related incident file 1

[vikarti]

possible related incident file 2

[vikarti]

possible related incident file 3

[davidsarah]

reformat description