[Dovecot] mbox sync assertion failed?

[ddalton]

freebsd 6.0
Dovecot v1.0.rc25


dovecot: Apr 14 17:06:25 Error: IMAP(ddalton): file mbox-sync-rewrite.c: 
line 408 (mbox_sync_read_and_move): assertion failed: (need_space == 
(uoff_t)-mails[idx].space)
dovecot: Apr 14 17:06:26 Error: child 60712 (imap) killed with signal 6


Core was generated by `imap'.
Program terminated with signal 6, Aborted.
Reading symbols from /usr/local/lib/libiconv.so.3...(no debugging 
symbols found)...done.
Loaded symbols for /usr/local/lib/libiconv.so.3
Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /usr/local/lib/dovecot/imap/drac.so...done.
Loaded symbols for /usr/local/lib/dovecot/imap/drac.so
Reading symbols from /usr/local/lib/nss_dns.so.1...done.
Loaded symbols for /usr/local/lib/nss_dns.so.1
Reading symbols from /libexec/ld-elf.so.1...done.
Loaded symbols for /libexec/ld-elf.so.1
#0  0x1821d4b3 in kill () from /lib/libc.so.6
(gdb) bt full
#0  0x1821d4b3 in kill () from /lib/libc.so.6
No symbol table info available.
#1  0x182124f0 in raise () from /lib/libc.so.6
No symbol table info available.
#2  0x1828cc5c in abort () from /lib/libc.so.6
No symbol table info available.
#3  0x080a7339 in i_set_failure_file ()
No symbol table info available.
#4  0x080a6e9f in i_panic ()
No symbol table info available.
#5  0x0807618b in mbox_sync_rewrite ()
No symbol table info available.
#6  0x080715c8 in mbox_sync_apply_index_syncs ()
No symbol table info available.
#7  0x080735c6 in mbox_sync ()
No symbol table info available.
#8  0x08073a38 in mbox_storage_sync_init ()
No symbol table info available.
#9  0x0805f7b2 in imap_sync_init ()
No symbol table info available.
#10 0x0805fc5f in cmd_sync ()
No symbol table info available.
#11 0x080566db in cmd_check ()
---Type <return> to continue, or q <return> to quit---
No symbol table info available.
#12 0x0805a43e in _client_reset_command ()
No symbol table info available.
#13 0x0805a3d2 in _client_reset_command ()
No symbol table info available.
#14 0x0805a584 in _client_input ()
No symbol table info available.
#15 0x080ac6d4 in io_loop_handler_run ()
No symbol table info available.
#16 0x080abd91 in io_loop_run ()
No symbol table info available.
#17 0x08061330 in main ()
No symbol table info available.
(gdb) quit