#0  0x00007f4a53e03405 in raise () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007f4a53e06680 in abort () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#2  0x00007f4a541a4aa8 in default_fatal_finish (type=LOG_TYPE_PANIC, status=0) at failures.c:187
        backtrace = 0x1d9f5f8 "/usr/local/lib/dovecot/libdovecot.so.0(+0x4fa81) [0x7f4a541a4a81] -> /usr/local/lib/dovecot/libdovecot.so.0(+0x50d67) [0x7f4a541a5d67] -> /usr/local/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7f4a541a4"...
#3  0x00007f4a541a5d67 in i_internal_fatal_handler (ctx=0x7fff2e5cfc50, format=0x7f4a5470a310 "file %s: line %d (%s): assertion failed: (%s)", args=0x7fff2e5cfc38) at failures.c:645
        status = 0
#4  0x00007f4a541a4d91 in i_panic (format=0x7f4a5470a310 "file %s: line %d (%s): assertion failed: (%s)") at failures.c:259
        ctx = {type = LOG_TYPE_PANIC, exit_status = 0, timestamp = 0x0}
        args = {{gp_offset = 40, fp_offset = 48, overflow_arg_area = 0x7fff2e5cfd20, reg_save_area = 0x7fff2e5cfc60}}
#5  0x00007f4a5464de71 in mail_user_ref (user=0x1de7130) at mail-user.c:128
        __FUNCTION__ = "mail_user_ref"
#6  0x00007f4a54648720 in mail_storage_obj_ref (storage=0x1dec780) at mail-storage.c:439
        __FUNCTION__ = "mail_storage_obj_ref"
#7  0x00007f4a54649074 in mailbox_alloc (list=0x1deb140, vname=0x1df5b50 "Sent", flags=MAILBOX_FLAG_READONLY) at mail-storage.c:664
        new_list = 0x1deb140
        storage = 0x1dec780
        box = 0x1deeae0
        __FUNCTION__ = "mailbox_alloc"
#8  0x00007f4a52d6ef16 in quota_count_mailbox (root=0x1ddfe10, ns=0x1ddfed0, vname=0x1df5b50 "Sent", bytes_r=0x7fff2e5cff20, count_r=0x7fff2e5cff18) at quota-count.c:30
        rule = 0x0
        box = 0x7fff2e5cfe40
        trans = 0x0
        ctx = 0x1dfca00
        mail = 0x1dfa500
        search_args = 0x1dfa3b0
        error = 32586
        size = 1421264208
        ret = 0
#9  0x00007f4a52d6f0ce in quota_count_namespace (root=0x1ddfe10, ns=0x1ddfed0, bytes=0x7fff2e5cff20, count=0x7fff2e5cff18) at quota-count.c:78
        ctx = 0x1dfa330
        info = 0x1dfa508
        ret = 0
#10 0x00007f4a52d6f1df in quota_count (root=0x1ddfe10, bytes_r=0x7fff2e5cff20, count_r=0x7fff2e5cff18) at quota-count.c:106
        namespaces = 0x1de0e80
        i = 0
        count = 1
        ret = 0
#11 0x00007f4a52d70e76 in dict_quota_count (root=0x1ddfe10, want_bytes=true, value_r=0x7fff2e5cff50) at quota-dict.c:113
        dt = 0x4
        bytes = 0
        count = 0
#12 0x00007f4a52d710cc in dict_quota_update_callback (ret=0, context=0x1ddfe10) at quota-dict.c:178
        root = 0x1ddfe10
        value = 0
#13 0x00007f4a541769f5 in client_dict_finish_transaction (dict=0x1dec370, id=1, ret=0) at dict-client.c:265
        ctx = 0x1e27200
        __FUNCTION__ = "client_dict_finish_transaction"
#14 0x00007f4a54176df0 in client_dict_read_one_line (dict=0x1dec370, line_r=0x7fff2e5cfff8) at dict-client.c:356
        id = 1
        line = 0x1dfca00 "AN1"
        ret = 0
        __FUNCTION__ = "client_dict_read_one_line"
#15 0x00007f4a5417748f in client_dict_wait (_dict=0x1dec370) at dict-client.c:520
        dict = 0x1dec370
        line = 0x0
        ret = 0
#16 0x00007f4a54175c7c in dict_wait (dict=0x1dec370) at dict.c:101
No locals.
#17 0x00007f4a52d70df6 in dict_quota_deinit (_root=0x1ddfe10) at quota-dict.c:90
        root = 0x1ddfe10
#18 0x00007f4a52d6c5ce in quota_root_deinit (root=0x1ddfe10) at quota.c:238
        pool = 0x1dec140
#19 0x00007f4a52d6ca40 in quota_deinit (_quota=0x1de82c8) at quota.c:333
        quota = 0x1de1d00
        roots = 0x1de1360
        i = 0
        count = 1
#20 0x00007f4a52d74b96 in quota_user_deinit (user=0x1de7130) at quota-storage.c:403
        quser = 0x1de82c0
        quota_set = 0x1deb950
#21 0x00007f4a5464df12 in mail_user_unref (_user=0x1daf0b8) at mail-user.c:141
        user = 0x1de7130
        __FUNCTION__ = "mail_user_unref"
#22 0x0000000000407246 in client_input_data_write_local (client=0x1daefb0, input=0x1dca7f0) at commands.c:670
        session = 0x1de1930
        src_mail = 0x1de2910
        old_uid = 0
        first_uid = 4294967295
        __FUNCTION__ = "client_input_data_write_local"
#23 0x000000000040763c in client_input_data_write (client=0x1daefb0) at commands.c:771
        input = 0x1dca7f0
        ret = true
#24 0x00000000004079cc in client_input_data_handle (client=0x1daefb0) at commands.c:865
        data = 0x1ddb710 ""
        size = 679
        ret = -1
#25 0x0000000000407a09 in client_input_data (client=0x1daefb0) at commands.c:874
No locals.
#26 0x00007f4a541b753f in io_loop_call_io (io=0x1dafa50) at ioloop.c:377
        ioloop = 0x1da6620
        t_id = 2
#27 0x00007f4a541b9070 in io_loop_handler_run (ioloop=0x1da6620) at ioloop-epoll.c:213
        ctx = 0x1dad500
        events = 0x1dad570
        event = 0x1dad570
        list = 0x1dae2a0
        io = 0x1dafa50
        tv = {tv_sec = 299, tv_usec = 975435}
        events_count = 6
        msecs = 299976
        ret = 1
        i = 0
        j = 0
        call = true
#28 0x00007f4a541b75e2 in io_loop_run (ioloop=0x1da6620) at ioloop.c:396
No locals.
#29 0x00007f4a5419c85e in master_service_run (service=0x1da64e0, callback=0x404144 <client_connected>) at master-service.c:499
No locals.
#30 0x0000000000404395 in main (argc=2, argv=0x1da6370) at main.c:120
        set_roots = {0x60b860, 0x409d20, 0x0}
        service_flags = MASTER_SERVICE_FLAG_KEEP_CONFIG_OPEN
        storage_service_flags = 739
        c = -1