[Dovecot] 2.2.10 - core dumps

[Jernej Porenta]

Heya,

We are occasionally seeing core dumps with dovecot 2.2.10, which are 
mostly like this:
Jan 11 18:31:08 hostname dovecot: imap(username): Panic: file 
mail-index-transaction-update.c: line 19 
(mail_index_transaction_lookup): assertion failed: (seq >= 
t->first_new_seq && seq <= t->last_new_seq)
Jan 11 18:31:08 hostname dovecot: imap(username): Error: Raw backtrace: 
/opt/dovecot-2.2.10/lib/dovecot/libdovecot.so.0 [0x2b657523aa3a] -> 
/opt/dovecot-2.2.10/lib/dovecot/libdovecot.so.0 [0x2b657523aaa6] -> 
/opt/dovecot-2.2.10/lib/dovecot/libdovecot.so.0 [0x2b6575239b83] -> 
/opt/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0 [0x2b6574f83458] 
-> /opt/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0 
[0x2b6574f86458] -> 
/opt/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(mail_cache_decision_state_update+0xbe) 
[0x2b6574f7605e] -> 
/opt/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(mail_cache_lookup_headers+0x87) 
[0x2b6574f77ba7] -> 
/opt/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0 [0x2b6574f64919] 
-> 
/opt/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0(index_mail_get_first_header+0x50) 
[0x2b6574f64e80] -> 
/opt/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0 [0x2b6574f5fda1] 
-> /opt/dovecot-2.2.10/lib/dovecot/libdovecot-storage.so.0 
[0x2b6574f5fee9] -> /opt/dovecot-2.2.10/lib/dovecot/libdove
Jan 11 18:31:08 hostname dovecot: imap(username): Fatal: master: 
service(imap): child 13548 killed with signal 6 (core dumps disabled)

# dovecot -n is available here: http://pastebin.com/RE91aRi5

other raw traces are available here: http://pastebin.com/M1S33NYn

Would you recommend deleting all the index files or rather capturing 
core dump file for further analysis? Or maybe something completely 
different ;)

thank you in advance,

cheers, Jernej