Sample debug backtrace for Dovecot 2.2.13

(gdb) bt full
#0  array_idx_modifiable_i (array=0xc8, idx=1) at array.c:12
        pos = <optimized out>
#1  0x00007fa6acacb540 in antispam_mailbox_allocated (box=0xe0de80) at mailbox.c:241
No locals.
#2  0x00007fa6ade3b491 in hook_mailbox_allocated (box=box@entry=0xe0de80) at mail-storage-hooks.c:344
        hooks__foreach_end = 0xe03758
        hooks = 0xe03748
        ctx = 0xe0ea90
#3  0x00007fa6ade37986 in mailbox_alloc (list=<optimized out>, vname=vname@entry=0x7fa6ade91a0b "INBOX", flags=flags@entry=(unknown: 0)) at mail-storage.c:719
        _data_stack_cur_id = 4
        new_list = 0xe07a20
        storage = 0xe05b60
        box = 0xe0de80
        open_error = MAIL_ERROR_NONE
        errstr = 0x0
        __FUNCTION__ = "mailbox_alloc"
#4  0x00007fa6ade404c2 in mailbox_list_mailbox (list=0xe07a20, name=name@entry=0x7fa6ade91a0b "INBOX", flags_r=flags_r@entry=0x7fff2e0c1e2c) at mailbox-list.c:1417
        box = <optimized out>
        existence = <optimized out>
        ret = <optimized out>
        path = <optimized out>
        fname = <optimized out>
        rootdir = <optimized out>
        dir = <optimized out>
        inbox = <optimized out>
        len = <optimized out>
#5  0x00007fa6ade501d5 in inbox_info_init (namespaces=0xe05a10, ctx=0xe0b260) at mailbox-list-iter.c:726
        flags = <optimized out>
#6  mailbox_list_iter_init_namespaces (namespaces=0xe05a10, patterns=patterns@entry=0xe08bb8,
    type_mask=type_mask@entry=(MAIL_NAMESPACE_TYPE_PRIVATE | MAIL_NAMESPACE_TYPE_SHARED | MAIL_NAMESPACE_TYPE_PUBLIC),
    flags=(MAILBOX_LIST_ITER_RETURN_CHILDREN | MAILBOX_LIST_ITER_RETURN_SPECIALUSE)) at mailbox-list-iter.c:764
        ctx = 0xe0b260
        i = <optimized out>
        count = 1
        pool = 0xe0b240
        __FUNCTION__ = "mailbox_list_iter_init_namespaces"
#7  0x0000000000410ee2 in cmd_list_init (patterns=0xe08bb8, ctx=0xe08b40) at cmd-list.c:303
        type_mask = (MAIL_NAMESPACE_TYPE_PRIVATE | MAIL_NAMESPACE_TYPE_SHARED | MAIL_NAMESPACE_TYPE_PUBLIC)
#8  cmd_list_full (cmd=0xe08a40, lsub=<optimized out>) at cmd-list.c:466
        client = <optimized out>
        args = 0xdf2ac8
        list_args = 0x7fa6ad79411c <__libc_calloc+172>
        arg_count = <optimized out>
        ctx = 0xe08b40
        patterns = {arr = {buffer = 0xe08b80, element_size = 8}, v = 0xe08b80, v_modifiable = 0xe08b80}
        ref = 0xe08b70 ""
        pattern = 0xe08b78 "INBOX"
        patterns_strarr = 0xe08bb8
        str = <optimized out>
#9  0x00000000004184ac in command_exec (cmd=cmd@entry=0xe08a40) at imap-commands.c:158
        hook = 0xdf00e0
        ret = <optimized out>
#10 0x00000000004174f0 in client_command_input (cmd=cmd@entry=0xe08a40) at imap-client.c:778
        client = 0xe08230
        command = <optimized out>
        __FUNCTION__ = "client_command_input"
#11 0x0000000000417584 in client_command_input (cmd=0xe08a40) at imap-client.c:839
        client = 0xe08230
        command = <optimized out>
        __FUNCTION__ = "client_command_input"
#12 0x0000000000417865 in client_handle_next_command (remove_io_r=<synthetic pointer>, client=0xe08230) at imap-client.c:877
No locals.
#13 client_handle_input (client=client@entry=0xe08230) at imap-client.c:889
        _data_stack_cur_id = 3
        ret = 2
        remove_io = false
        handled_commands = false
        __FUNCTION__ = "client_handle_input"
#14 0x0000000000417c12 in client_input (client=0xe08230) at imap-client.c:931
        cmd = <optimized out>
        output = 0xe060a0
        bytes = 19
        __FUNCTION__ = "client_input"
#15 0x00007fa6adb592db in io_loop_call_io (io=0xe06170) at ioloop.c:449
        ioloop = 0xdef730
        t_id = 2
        __FUNCTION__ = "io_loop_call_io"
#16 0x00007fa6adb5a2fb in io_loop_handler_run_internal (ioloop=ioloop@entry=0xdef730) at ioloop-epoll.c:220
        ctx = 0xdf03c0
        events = 0x1
        event = 0xdf1230
        list = 0xdf1e20
        io = <optimized out>
        tv = {tv_sec = 1799, tv_usec = 998831}
        events_count = <optimized out>
        msecs = <optimized out>
        ret = 1
        i = <optimized out>
        call = <optimized out>
        __FUNCTION__ = "io_loop_handler_run_internal"
#17 0x00007fa6adb59369 in io_loop_handler_run (ioloop=ioloop@entry=0xdef730) at ioloop.c:496
No locals.
#18 0x00007fa6adb593e8 in io_loop_run (ioloop=0xdef730) at ioloop.c:473
        __FUNCTION__ = "io_loop_run"
#19 0x00007fa6adb02053 in master_service_run (service=0xdef5c0, callback=callback@entry=0x420d40 <client_connected>) at master-service.c:566
No locals.
#20 0x000000000040c23a in main (argc=1, argv=0xdef390) at main.c:410
        set_roots = {0x428a20 <imap_setting_parser_info>, 0x0}
        login_set = {auth_socket_path = 0xde7048 "\001", postlogin_socket_path = 0x0, postlogin_timeout_secs = 60, callback = 0x420ba0 <login_client_connected>,
          failure_callback = 0x4208d0 <login_client_failed>, request_auth_token = 1}
        service_flags = <optimized out>
        storage_service_flags = <optimized out>
        username = 0x0
        c = <optimized out>