[Dovecot] Panic: file mail-index-sync-ext.c: line 212 (sync_ext_reorder): assertion failed: (offset < (uint16_t)-1)

[Sandro Tosi]

Hello,
we are using dovecot v1.2.10 on debian stable (lenny) systems with 
mailboxes on NFS, and we are facing this quite ugly crash:

2010-04-27 10:59:06 IMAP(<mailbox>): Panic: file mail-index-sync-ext.c: 
line 212 (sync_ext_reorder): assertion failed: (offset < (uint16_t)-1)
2010-04-27 10:59:06 dovecot: Error: child 2429 (imap) killed with signal 
6 (core dumps disabled)
2010-04-27 10:59:06 IMAP(<mailbox>): Error: Raw backtrace: imap 
[0x80f2ea1] -> imap [0x80f2f22] -> imap [0x80f2879] -> imap [0x80df6ad] 
-> imap(mail_index_sync_ext_intro+0x25b) [0x80e043b] -> 
imap(mail_index_sync_record+0x164) [0x80ce8e4] -> 
imap(mail_index_sync_map+0x2c3) [0x80cf6d3] -> 
imap(mail_index_map+0x465) [0x80c47f5] -> imap [0x80c1053] -> 
imap(mail_index_open+0x24f) [0x80c150f] -> 
imap(index_storage_mailbox_open+0x72) [0x80acbb2] -> 
imap(index_storage_mailbox_init+0x132) [0x80acf72] -> imap [0x80847f8] 
-> imap [0x8084a9d] -> imap(mailbox_open+0x69) [0x80b71b9] -> 
imap(cmd_select_full+0x1dd) [0x806503d] -> imap(cmd_select+0x19) 
[0x8065999] -> imap [0x8067c7c] -> imap [0x8067d19] -> 
imap(client_handle_input+0x2d) [0x8067e8d] -> imap(client_input+0x5f) 
[0x80687ef] -> imap(io_loop_handler_run+0xe0) [0x80fbc50] -> 
imap(io_loop_run+0x20) [0x80fb0c0] -> imap(main+0x5ea) [0x80712fa] -> 
/lib/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7dbf455] -> imap 
[0x8060361]

the only solution we have found is to delete the dovecot.index* files, 
and let dovecot regenerate them at the next access.

could you please give it a look?

Thanks in advance,
Sandro