AF saw this bug -- it happened nondeterministically:
time tahoe cp /tmp/zeros-100m tahoe:zeros3
Error during PUT: 500 Internal Server Error
"Traceback (most recent call last):
File \"/root/allmydata-tahoe-1.10.0/support/lib/python2.7/site-packages/Twisted-13.0.0-py2.7-linux-x86_64.egg/twisted/internet/base.py\", line 824, in runUntilCurrent
call.func(*call.args, **call.kw)
File \"/root/allmydata-tahoe-1.10.0/support/lib/python2.7/site-packages/foolscap-0.6.4-py2.7.egg/foolscap/eventual.py\", line 26, in _turn
cb(*args, **kwargs)
File \"/root/allmydata-tahoe-1.10.0/support/lib/python2.7/site-packages/Twisted-13.0.0-py2.7-linux-x86_64.egg/twisted/internet/defer.py\", line 380, in callback
self._startRunCallbacks(result)
File \"/root/allmydata-tahoe-1.10.0/support/lib/python2.7/site-packages/Twisted-13.0.0-py2.7-linux-x86_64.egg/twisted/internet/defer.py\", line 488, in _startRunCallbacks
self._runCallbacks()
--- <exception caught here> ---
File \"/root/allmydata-tahoe-1.10.0/support/lib/python2.7/site-packages/Twisted-13.0.0-py2.7-linux-x86_64.egg/twisted/internet/defer.py\", line 575, in _runCallbacks
current.result = callback(current.result, *args, **kw)
File \"/root/allmydata-tahoe-1.10.0/src/allmydata/mutable/filenode.py\", line 854, in <lambda>
self._modify_once(modifier, first_time))
File \"/root/allmydata-tahoe-1.10.0/src/allmydata/mutable/filenode.py\", line 880, in _modify_once
d = self._try_to_download_data()
File \"/root/allmydata-tahoe-1.10.0/src/allmydata/mutable/filenode.py\", line 958, in _try_to_download_data
d = self._read(c, fetch_privkey=True)
File \"/root/allmydata-tahoe-1.10.0/src/allmydata/mutable/filenode.py\", line 980, in _read
d = r.download(consumer, offset, size)
File \"/root/allmydata-tahoe-1.10.0/src/allmydata/mutable/retrieve.py\", line 244, in download
self._setup_download()
File \"/root/allmydata-tahoe-1.10.0/src/allmydata/mutable/retrieve.py\", line 284, in _setup_download
shares = versionmap[self.verinfo]
exceptions.KeyError: (9, '\\x9b\\xb9\\xaa\\xa5\\xfa\\x88\\x9bX\\x03\\x99HK\\x06\\xed\\xa5V\\x12\\xd6f\\x97l^\\x9f\\x06\\x98\\xac\\xe7\\xb4\\xcdn\\x82\\xa8', 'V\\x97\\x15\\\\\\xf8[7\\rZ\\x9bZ\\xf1\\x93\\xe2\\xdb\\xc2', 2145, 2144, 3, 10, '\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\t\\x9b\\xb9\\xaa\\xa5\\xfa\\x88\\x9bX\\x03\\x99HK\\x06\\xed\\xa5V\\x12\\xd6f\\x97l^\\x9f\\x06\\x98\\xac\\xe7\\xb4\\xcdn\\x82\\xa8V\\x97\\x15\\\\\\xf8[7\\rZ\\x9bZ\\xf1\\x93\\xe2\\xdb\\xc2\\x03\\n\\x00\\x00\\x00\\x00\\x00\\x00\\x08a\\x00\\x00\\x00\\x00\\x00\\x00\\x08\`', (('enc_privkey', 1538), ('EOF', 2753), ('share_data', 823), ('signature', 399), ('block_hash_tree', 791), ('share_hash_chain', 655)))
"
(Presumably it is happening on the update of the tahoe:zeros3 directory.)
Notice that this is using Tahoe-LAFS v1.10.
