exception from attempt to parse leases

[zooko]

From twistd.log on prodtahoe17 data6:

2009/09/25 13:00 -0700 [-] Log opened.
2009/09/25 13:00 -0700 [-] twistd 2.5.0 (/usr/bin/python 2.5.2) starting up
2009/09/25 13:00 -0700 [-] reactor class: <class 'twisted.internet.selectreactor.SelectReactor'>
2009/09/25 13:00 -0700 [-] Loading tahoe-client.tac...
2009-09-25 20:01:14.954Z [-] Loaded.
2009-09-25 20:01:14.956Z [-] foolscap.pb.Listener starting on 39324
2009-09-25 20:01:14.956Z [-] twisted.conch.manhole_ssh.ConchFactory starting on 8226
2009-09-25 20:01:14.956Z [-] Starting factory <twisted.conch.manhole_ssh.ConchFactory instance at 0x8bfe2cc>
2009-09-25 20:01:14.957Z [-] nevow.appserver.NevowSite starting on 9006
2009-09-25 20:01:14.957Z [-] Starting factory <nevow.appserver.NevowSite instance at 0x8db516c>
2009-09-25 20:01:14.957Z [-] Manhole listening via SSH on port 8226
2009-09-25 20:01:14.958Z [-] twisted.internet.protocol.DatagramProtocol starting on 35896
2009-09-25 20:01:14.958Z [-] Starting protocol <twisted.internet.protocol.DatagramProtocol instance at 0x8db576c>
2009-09-25 20:01:14.960Z [-] (Port 35896 Closed)
2009-09-25 20:01:14.961Z [-] Stopping protocol <twisted.internet.protocol.DatagramProtocol instance at 0x8db576c>
2009-09-27 12:57:40.124Z [-] lease-checker error processing /data6/storage/storage/shares/g6/g6rvkc5jdkgoqhljuxgkquzhvq/5
2009-09-27 12:57:40.130Z [-] Unhandled Error
        Traceback (most recent call last):
          File "/usr/lib/python2.5/site-packages/twisted/internet/base.py", line 561, in runUntilCurrent
            call.func(*call.args, **call.kw)
          File "/usr/lib/python2.5/site-packages/allmydata/storage/crawler.py", line 262, in start_slice
            self.start_current_prefix(start_slice)
          File "/usr/lib/python2.5/site-packages/allmydata/storage/crawler.py", line 321, in start_current_prefix
            buckets, start_slice)
          File "/usr/lib/python2.5/site-packages/allmydata/storage/crawler.py", line 361, in process_prefixdir
            self.process_bucket(cycle, prefix, prefixdir, bucket)
        --- <exception caught here> ---
          File "/usr/lib/python2.5/site-packages/allmydata/storage/expirer.py", line 128, in process_bucket
            wks = self.process_share(sharefile)
          File "/usr/lib/python2.5/site-packages/allmydata/storage/expirer.py", line 171, in process_share
            for li in sf.get_leases():
          File "/usr/lib/python2.5/site-packages/allmydata/storage/mutable.py", line 242, in get_leases
            for i, lease in self._enumerate_leases(f):
          File "/usr/lib/python2.5/site-packages/allmydata/storage/mutable.py", line 247, in _enumerate_leases
            for i in range(self._get_num_lease_slots(f)):
          File "/usr/lib/python2.5/site-packages/allmydata/storage/mutable.py", line 227, in _get_num_lease_slots
            num_extra_leases = self._read_num_extra_leases(f)
          File "/usr/lib/python2.5/site-packages/allmydata/storage/mutable.py", line 129, in _read_num_extra_leases
            (num_extra_leases,) = struct.unpack(">L", f.read(4))
          File "/usr/lib/python2.5/struct.py", line 87, in unpack
            return o.unpack(s)
        struct.error: unpack requires a string argument of length 4

$ tahoe --version
tahoe-server: 1.4.1, foolscap: 0.4.2, pycryptopp: 0.5.16-r669, zfec: 1.4.0-4, Twisted: 2.5.0, Nevow: 0.9.26, zope.interface: 3.3.1, python: 2.5.2, platform: Linux-Ubuntu_8.04-i686-32bit, pyutil: 1.3.20, simplejson: 1.7.3, argparse: 0.8.0, pyOpenSSL: 0.6, z-base-32: 1.0.1, setuptools: 0.6c8

No incident logs.