[Dovecot] mail_index_sync_map error on 1.1.14

[Mike Abbott]

Seen this error a few times from dovecot-1.1.14, Mac OS X, 64-bit  
Intel.  NFS may have been used.

Panic: IMAP(user): file mail-index-sync-update.c: line 843  
(mail_index_sync_map): assertion failed: (map->hdr.indexid == index- 
 >indexid || map->hdr.indexid == 0)

Two different backtraces to this error are:

0   libSystem.B.dylib             	0x00007fff87b775ea __kill + 10
1   libSystem.B.dylib             	0x00007fff87bf9fc8 abort + 83
2   imap                          	0x0000000100069f3e  
default_fatal_finish + 70
3   imap                          	0x0000000100069f8c  
i_syslog_fatal_handler + 0
4   imap                          	0x00000001000696eb i_info + 0
5   imap                          	0x0000000100051d3a  
mail_index_sync_map + 144
6   imap                          	0x000000010004a22c mail_index_map +  
212
7   imap                          	0x0000000100046a0f  
mail_index_refresh + 14
8   imap                          	0x0000000100016e4b  
maildir_sync_header_refresh + 24
9   imap                          	0x0000000100016ee6  
maildir_sync_quick_check + 61
10  imap                          	0x000000010001796a  
maildir_sync_context + 91
11  imap                          	0x0000000100017d8e  
maildir_storage_sync_init + 104
12  imap                          	0x000000010003eb1b mailbox_sync + 31
13  imap                          	0x00000001000048a8 cmd_select_full  
+ 224
14  imap                          	0x00000001000049f3 cmd_select + 11
15  imap                          	0x000000010000677e  
client_command_input + 33
16  imap                          	0x000000010000693f  
client_command_input + 482
17  imap                          	0x0000000100006a3e  
client_handle_input + 239
18  imap                          	0x0000000100006bc2 client_input + 148
19  imap                          	0x0000000100070f83  
io_loop_handler_run + 272
20  imap                          	0x0000000100070348 io_loop_run + 55
21  imap                          	0x000000010000db95 main + 1635
22  imap                          	0x0000000100001010 start + 52

0   libSystem.B.dylib                   0x00007fff863125ea __kill + 10
1   libSystem.B.dylib                   0x00007fff86394fc8 abort + 83
2   deliver                             0x000000010005f82d  
default_fatal_finish + 70
3   deliver                             0x000000010005f8fb  
i_set_failure_syslog + 0
4   deliver                             0x000000010005efda i_info + 0
5   deliver                             0x000000010004867e  
mail_index_sync_map + 144
6   deliver                             0x0000000100040b70  
mail_index_map + 212
7   deliver                             0x000000010003d353  
mail_index_refresh + 14
8   deliver                             0x0000000100044219  
mail_index_transaction_commit_v + 988
9   deliver                             0x0000000100032e1c  
index_transaction_finish_commit + 90
10  deliver                             0x000000010000fc4d  
maildir_transaction_commit + 130
11  deliver                             0x0000000100032cb9  
index_transaction_commit + 63
12  lib10_quota_plugin.so               0x000000010021efd9  
quota_get_mail_user_quota + 1907
13  deliver                             0x00000001000354ac  
mailbox_transaction_commit + 48
14  deliver                             0x0000000100001844  
deliver_save + 572
15  deliver                             0x0000000100003244 main + 6266
16  deliver                             0x0000000100000948 start + 52