corrupted mailboxes.db

Hello,

I run cyrus imap 2.5.11.
Somehow mailboxes.db become corrupted.
running `ctl_mboxlist -d` leads to segfault, backtrace below.

How can I recover mailboxes.db ?

Backtrace
#0  0x0000007d43e12952 in printf (__fmt=0x7d43e143c2 "%s\t%d %s %s\n") 
at /usr/include/bits/stdio2.h:104
#1  dump_cb (rockp=rockp@entry=0x384c65d6e90, key=<optimized out>, 
keylen=<optimized out>,
     data=data@entry=0x23d2177d3d5 <error: Cannot access memory at 
address 0x23d2177d3d5>, datalen=datalen@entry=61) at imap/ctl_mboxlist.c:182
#2  0x0000023d432db22a in myforeach (db=0x7d444012d0, 
prefix=0x7d43e144ec "", prefixlen=0, goodp=0x0, cb=0x7d43e12890 
<dump_cb>, rock=0x384c65d6e90,
     tidptr=<optimized out>) at lib/cyrusdb_twoskip.c:1567
#3  0x0000023d4363bea7 in mboxlist_allmbox (prefix=<optimized out>, 
proc=0x7d43e12890 <dump_cb>, rock=0x384c65d6e90, incdel=1) at 
imap/mboxlist.c:2326
#4  0x0000007d43e12e87 in do_dump (op=DUMP, part=0x0, purge=0) at 
imap/ctl_mboxlist.c:458
#5  0x0000007d43e12548 in main (argc=4, argv=0x384c65d9058) at 
imap/ctl_mboxlist.c:1029


Best, Deniss
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