[Zope] ZODB Storage Error

[Anthony Baxter]

Several times lately, we've seen our development Zope server (running
CVS of a few days ago) go into a mode where all requests return back
this:

Error Type: TransactionError
Error Value: A serious error, which was probably a system error, occurred
in a previous database transaction. This application may be in an invalid
state and must be restarted before database updates can be allowed. Beware
though that if the error was due to a serious system problem, such as
a disk full condition, then the application may not come up until you
deal with the system problem. See your application log for information
on the error that lead to this problem.

The only thing in the log is this:

1999-11-24T05:51:23 PANIC(300) ZODB An storage error occurred in the last 
phase of a two-phase commit.  This shouldn't happen. The application may 
be in a hosed state, so we will not allow transactions to commit from here on


How can I debug this further???

Help?

Anthony