dovecot - Aug 2008 - imap crash with sig 11, backtrace, dovecot 1.1.2

GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
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This GDB was configured as "i486-linux-gnu"...
Reading symbols from /lib/i686/cmov/libdl.so.2...Reading symbols from
/usr/lib/debug/lib/i686/cmov/libdl-2.7.so...done.
done.
Loaded symbols for /lib/i686/cmov/libdl.so.2
Reading symbols from /lib/i686/cmov/libc.so.6...Reading symbols from
/usr/lib/debug/lib/i686/cmov/libc-2.7.so...done.
done.
Loaded symbols for /lib/i686/cmov/libc.so.6
Reading symbols from /lib/ld-linux.so.2...Reading symbols from
/usr/lib/debug/lib/ld-2.7.so...done.
done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /usr/local/lib/dovecot/imap/lib10_quota_plugin.so...done.
Loaded symbols for /usr/local/lib/dovecot/imap/lib10_quota_plugin.so
Reading symbols from
/usr/local/lib/dovecot/imap/lib11_imap_quota_plugin.so...done.
Loaded symbols for /usr/local/lib/dovecot/imap/lib11_imap_quota_plugin.so
Reading symbols from /usr/local/lib/dovecot/imap/lib11_trash_plugin.so...done.
Loaded symbols for /usr/local/lib/dovecot/imap/lib11_trash_plugin.so
Reading symbols from /usr/local/lib/dovecot/imap/lib20_fts_plugin.so...done.
Loaded symbols for /usr/local/lib/dovecot/imap/lib20_fts_plugin.so
Reading symbols from
/usr/local/lib/dovecot/imap/lib20_mail_log_plugin.so...done.
Loaded symbols for /usr/local/lib/dovecot/imap/lib20_mail_log_plugin.so
Reading symbols from
/usr/local/lib/dovecot/imap/lib21_fts_squat_plugin.so...done.
Loaded symbols for /usr/local/lib/dovecot/imap/lib21_fts_squat_plugin.so
Core was generated by `/usr/local/libexec/dovecot/imap'.
Program terminated with signal 11, Segmentation fault.
[New process 22653]
#0  array_idx_modifiable_i (array=0x90ac9ec, idx=0) at array.c:11
11		if (pos >= array->buffer->used) {
#0  array_idx_modifiable_i (array=0x90ac9ec, idx=0) at array.c:11
#1  0x080c4788 in mail_index_sync_ext_reset (ctx=0xbfeca000, u=0xbfec9f70)
    at mail-index-sync-ext.c:518
#2  0x080b65f9 in mail_index_sync_record (ctx=0xbfeca000, hdr=0x90ac348, 
    data=0x90acfb8) at mail-index-sync-update.c:546
#3  0x080b6bef in mail_index_sync_map (_map=0x90ab468, 
    type=MAIL_INDEX_SYNC_HANDLER_HEAD, force=true)
    at mail-index-sync-update.c:828
#4  0x080b048f in mail_index_map (index=0x90ab430, 
    type=MAIL_INDEX_SYNC_HANDLER_HEAD) at mail-index-map.c:953
#5  0x080acec3 in mail_index_try_open (index=0x90ab430) at mail-index.c:290
#6  0x080ad21f in mail_index_open (index=0x90ab430, flags=49, 
    lock_method=FILE_LOCK_METHOD_FCNTL) at mail-index.c:354
#7  0x080a11f2 in index_storage_mailbox_open (ibox=0x90aae50)
    at index-storage.c:383
#8  0x080709ab in maildir_open (storage=0x90a3cc0, name=0x90a86ee
"Drafts",
    flags=0) at maildir-storage.c:448
#9  0x08070b14 in maildir_mailbox_open (_storage=0x90a3cc0, 
    name=0x90a86ee "Drafts", input=0x0, flags=0) at
maildir-storage.c:512
#10 0xb7e301ca in mail_log_mailbox_open (storage=0x90a3cc0, 
    name=0x90a86ee "Drafts", input=0x0, flags=0) at
mail-log-plugin.c:450
#11 0xb7e4166a in quota_mailbox_open (storage=0x90a3cc0, 
    name=0x90a86ee "Drafts", input=0x0, flags=0) at
quota-storage.c:366
#12 0x080a52b9 in mailbox_open (storage=0x90a3cc0, name=0x90a86ee
"Drafts",
    input=0x0, flags=0) at mail-storage.c:459
#13 0x08060cbc in cmd_select_full (cmd=0x90a45f0, readonly=false)
    at cmd-select.c:32
#14 0x08060ea9 in cmd_select (cmd=0x90a45f0) at cmd-select.c:88
#15 0x0806276c in client_command_input (cmd=0x90a45f0) at client.c:580
#16 0x08062803 in client_command_input (cmd=0x90a45f0) at client.c:629
#17 0x08062dbd in client_handle_input (client=<value optimized out>)
    at client.c:670
#18 0x0806323e in client_input (client=0x90a43a8) at client.c:725
#19 0x080dd8d0 in io_loop_handler_run (ioloop=0x90a09b0) at ioloop-epoll.c:203
#20 0x080dcd40 in io_loop_run (ioloop=0x90a09b0) at ioloop.c:320
#21 0x0806b3aa in main (argc=) at main.c:293