Weird error "SQUAT failed to open index" - but index exist.

[Josef Karliak]

   Good morning,
   I connect to cyrus imap server remotely by Roundcube web client. When 
I tried to connect, I get an error from the syslog on imap server:
Nov  1 11:34:36 servername imap[15980]: login: cl.domain.cz 
[192.168.24.52] mailarchiv plaintext User logged in 
SESSIONID=<servername-15980-1509532476-1>
Nov  1 11:34:36 servername imap[15980]: USAGE mailarchiv user: 0.000000 
sys: 0.002000
Nov  1 11:34:37 servername imap[15979]: open: user mailarchiv opened 
INBOX.Deleted Items
Nov  1 11:34:37 servername imap[15979]: USAGE mailarchiv user: 0.159000 
sys: 0.015000
Nov  1 11:34:37 servername imap[15980]: accepted connection
Nov  1 11:34:37 servername imap[15980]: login: cl.domain.cz 
[192.168.24.52] mailarchiv plaintext User logged in 
SESSIONID=<servername-15980-1509532477-1>
Nov  1 11:34:37 servername imap[15980]: open: user mailarchiv opened 
INBOX
Nov  1 11:34:37 servername imap[15980]: open: user mailarchiv opened 
INBOX
Nov  1 11:34:38 servername imap[15980]: open: user mailarchiv opened 
INBOX
Nov  1 11:34:38 servername imap[15980]: SQUAT failed to open index
Nov  1 11:34:38 servername imap[15980]: SQUAT failed

   The cyrus'es file exists:
servername:~ # l /var/spool/imap/user/mailarchiv/cyrus*
-rw------- 1 cyrus mail 1717911544  1. lis 11.03 
/var/spool/imap/user/mailarchiv/cyrus.cache
-rw------- 1 cyrus mail        200 28. dub  2015 
/var/spool/imap/user/mailarchiv/cyrus.header
-rw------- 1 cyrus mail   75174656  1. lis 11.03 
/var/spool/imap/user/mailarchiv/cyrus.index
-rw------- 1 cyrus mail 3241706569  1. lis 11.02 
/var/spool/imap/user/mailarchiv/cyrus.squat

   Roundcube returns error "Chyba serveru! (Internal Server Error)". BUT 
- the problem is only with main folder, others folders do not return 
error.
   I tried Squirrelmail too, the SM freezes

   Any ideas ? Reconstructing mailbox or handly runned squatter do not 
helped.
   Thanks and best regards
   J.Karliak


-- 
Ma domena pouziva zabezpeceni a kontrolu SPF (www.openspf.org) a
DomainKeys/DKIM (s ADSP) a implementaci DMARC. Pokud mate problemy s
dorucenim emailu, zacnete pouzivat metody overeni puvody emailu
zminene vyse. Dekuji.
My domain use SPF (www.openspf.org) and DomainKeys/DKIM (with ADSP)
policy and implementation of the DMARC. If you've problem with sending
emails to me, start using email origin methods mentioned above. Thank
you.