squat core dump

[Ilya]

Today one of my users complained that the inbox doesnt show any messages.
Upon investigation I saw that messages are still present, however there was an
imapd.core file in that user's dir
any suggestions?
this is gdb trace:
#0  0x8076036 in memconst (s=0x2849cff2 <Address 0x2849cff2 out of bounds>,
len=16, v=0) at squat.c:80
80      squat.c: No such file or directory.
(gdb) where
#0  0x8076036 in memconst (s=0x2849cff2 <Address 0x2849cff2 out of bounds>,
len=16, v=0) at squat.c:80
#1  0x807624a in squat_search_open (fd=14) at squat.c:133
#2  0x8075e2f in search_squat (msg_list=0x8127c00, mailbox=0x810b180,
searchargs=0x812c180) at search_engines.c:257
#3  0x8075fca in search_prefilter_messages (msg_list=0x8127c00,
mailbox=0x810b180, searchargs=0x812c180)
    at search_engines.c:309
#4  0x805c01e in _index_search (msgno_list=0xbfbfebcc, mailbox=0x810b180,
searchargs=0x812c180) at index.c:945
#5  0x805c250 in index_sort (mailbox=0x810b180, sortcrit=0x8129a00,
searchargs=0x812c180, usinguid=1) at index.c:1040
#6  0x805344a in cmd_sort (tag=0x811bb80 "00000006", usinguid=1) at imapd.c:3339
#7  0x804f8c8 in cmdloop () at imapd.c:1496
#8  0x804d755 in service_main (argc=2, argv=0x8114000, envp=0xbfbffdac) at
imapd.c:667
#9  0x804c1ce in main (argc=2, argv=0xbfbffda0, envp=0xbfbffdac) at
service.c:507
#10 0x804b629 in _start ()

localhost.alchemistry.net> ver
name       : Cyrus IMAPD
version    : v2.1.11 2002/12/19 16:58:38
vendor     : Project Cyrus
support-url: http://asg.web.cmu.edu/cyrus
os         : FreeBSD
os-version : 4.7-STABLE
environment: Cyrus SASL 2.1.10
             Sleepycat Software: Berkeley DB 3.3.11: (July 12, 2001)
             OpenSSL 0.9.6g 9 Aug 2002
             CMU Sieve 2.2
             TCP Wrappers
             mmap = shared
             lock = fcntl
             nonblock = fcntl
             auth = unix
             idle = poll
             mboxlist.db = skiplist
             subs.db = skiplist
             seen.db = skiplist
             duplicate.db = skiplist
             tls.db = skiplist