Core was generated by `dovecot/imap'.
Program terminated with signal 11, Segmentation fault.
#0  0xb745d876 in array_get_modifiable_i (array=0x9de57f8, count_r=0xbfa2f314) at ../../../src/lib/array.h:198
198             *count_r = array->buffer->used / array->element_size;
(gdb) bt full

#0  0xb745d876 in array_get_modifiable_i (array=0x9de57f8, count_r=0xbfa2f314) at ../../../src/lib/array.h:198
198             *count_r = array->buffer->used / array->element_size;
(gdb) bt full
#0  0xb745d876 in array_get_modifiable_i (array=0x9de57f8, count_r=0xbfa2f314) at ../../../src/lib/array.h:198
No locals.
#1  0xb745e8ad in virtual_config_free (mbox=0x9de56a8) at virtual-config.c:393
        bboxes = 0x9de58a0
        i = 3215127352
        count = 3077046260
#2  0xb7460db8 in virtual_mailbox_free (box=0x9de56a8) at virtual-storage.c:326
        mbox = 0x9de56a8
#3  0xb746c5d3 in fts_mailbox_free (box=0x9de56a8) at fts-storage.c:71
        fbox = 0x9de5c88
#4  0xb76a4142 in mailbox_free (_box=0xbfa2f3f0) at mail-storage.c:637
        box = 0x9de56a8
#5  0xb7609374 in cmd_getquotaroot (cmd=0x9ab8c18) at imap-quota-plugin.c:116
        client = 0x9ab8810
        quser = 0x9ab5820
        ns = 0x9ab4550
        box = 0x0
        iter = 0x0
        root = 0x0
        mailbox = 0x9aba4d0 "virtual/ungelesen"
        storage_name = 0x9aba4d8 "ungelesen"
        name = 0x9ab40c0 "user"
        quotaroot_reply = 0x9a92460
        quota_reply = 0x9a92510
#6  0x080581c1 in client_command_input (cmd=0x9ab8c18) at imap-client.c:646
        client = 0x9ab8810
        command = 0x8058eb1
        __FUNCTION__ = "client_command_input"
#7  0x080583f4 in client_command_input (cmd=0x9ab8c18) at imap-client.c:696
        client = 0x9ab8810
        command = 0x9a9ae5c
        __FUNCTION__ = "client_command_input"
#8  0x080584f7 in client_handle_next_command (client=0x9ab8810, remove_io_r=0xbfa2f4ee) at imap-client.c:737
        size = 36
#9  0x08058575 in client_handle_input (client=0x9ab8810) at imap-client.c:749
        _data_stack_cur_id = 3
        ret = 9
        remove_io = false
        handled_commands = false
        __FUNCTION__ = "client_handle_input"
#10 0x080586cc in client_input (client=0x9ab8810) at imap-client.c:788
        cmd = 0x0
        output = 0x9ab1f8c
        bytes = 36
        __FUNCTION__ = "client_input"
#11 0xb7656455 in io_loop_handler_run (ioloop=0x9a9a358) at ioloop-epoll.c:212
        ctx = 0x9a9a478
        events = 0x9a9a4b8
        event = 0x9a9a4b8
        list = 0x9ab45c8
        io = 0x9ab45a0
        tv = {tv_sec = 1799, tv_usec = 999117}
        events_count = 6
        t_id = 2
        msecs = 1800000
        ret = 1
        i = 0
        j = 0
        call = true
#12 0xb7655182 in io_loop_run (ioloop=0x9a9a358) at ioloop.c:350
No locals.
#13 0xb763f254 in master_service_run (service=0x9a9a2a8, callback=0x806302a <client_connected>) at master-service.c:480
No locals.
#14 0x08063277 in main (argc=1, argv=0x9a9a1c0) at main.c:357
        set_roots = {0x8066380, 0x0}
        service_flags = MASTER_SERVICE_FLAG_KEEP_CONFIG_OPEN
        storage_service_flags = MAIL_STORAGE_SERVICE_FLAG_DISALLOW_ROOT
        postlogin_socket_path = 0x0
        username = 0x0
        c = -1