Mysterious quota poltergeist

[GreenGecko]

We are running cyrus imap and having odd problems with quotas resetting to
low levels. We actually would be happy having no quotas, but that doesn't
seem to be an option. So, they are set as high as possible:

localhost> lqr user/crowston
user/crowston STORAGE 58816/2147483647 (0.00273883342870457%)

However, from time to time I get an error moving email into a folder and the
imap log shows messages such as the following:

Feb 21 21:53:48 nanobot imaps[14790]: quota set to 131072 for mailbox
user.crowston
Feb 21 21:53:52 nanobot imaps[14790]: quota set to "unlimited" for mailbox
user.crowston
Feb 21 21:58:36 nanobot imaps[14859]: quota set to 131072 for mailbox
user.crowston
Feb 21 22:00:19 nanobot imaps[14888]: quota set to 131072 for mailbox
user.crowston
Feb 21 22:08:37 nanobot imaps[14984]: quota set to 131072 for mailbox
user.crowston
Feb 21 22:14:10 nanobot imaps[15048]: quota set to 131072 for mailbox
user.crowston
Feb 21 22:18:27 nanobot imaps[15119]: quota set to 131072 for mailbox
user.crowston

Yes, it's flipping between unlimited and 131072. I noticed that the limit
and amount used are stored in the same file, and the file is constantly
being updated, and wondered if there was some problem with that, so I tried
changing the quota store from files to Berkeley db, but the same problem
reoccurred. Resetting the quota to a big number helps for a transaction or
two, but it then goes back down.

Here's the version info:

localhost> version
name       : Cyrus IMAPD
version    : v2.2.12-OS X 10.4.0 2005/05/12 16:57:46
vendor     : Project Cyrus
support-url: http://asg.web.cmu.edu/cyrus
os         : Darwin
os-version : 8.2.1
environment: Built w/Cyrus SASL 2.1.21
             Running w/Cyrus SASL 2.1.18
             Built w/Sleepycat Software: Berkeley DB 4.3.28: (April 22,
2005)
             Running w/Sleepycat Software: Berkeley DB 4.3.28: (April 22,
2005)
             Built w/OpenSSL 0.9.7d 17 Mar 2004
             Running w/OpenSSL 0.9.7g 11 Apr 2005
             CMU Sieve 2.2
             TCP Wrappers
             mmap = shared
             lock = fcntl
             nonblock = fcntl
             auth = krb
             idle = poll

Anyone have any ideas?
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