#0  0xf57fe416 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb74f1a1a in raise () from /lib/libc.so.6
No symbol table info available.
#2  0xb74f3014 in abort () from /lib/libc.so.6
No symbol table info available.
#3  0xb76911c5 in default_fatal_finish (type=<optimized out>, status=<optimized out>) at failures.c:191
        backtrace = 0x8df75a8 "/usr/lib/dovecot/libdovecot.so.0(+0x451b1) [0xb76911b1] -> /usr/lib/dovecot/libdovecot.so.0(+0x4521f) [0xb769121f] -> /usr/lib/dovecot/libdovecot.so.0(i_fatal+0) [0xb7660d4e] -> /usr/lib/dovecot/libdo"...
#4  0xb769121f in i_internal_fatal_handler (ctx=0xbfaff584,
    format=0xb7767320 "file %s: line %d (%s): assertion failed: (%s)", args=0xbfaff5a4 "ϥv\267Z")
    at failures.c:649
        status = 0
#5  0xb7660d4e in i_panic (format=0xb7767320 "file %s: line %d (%s): assertion failed: (%s)")
    at failures.c:263
        ctx = {type = LOG_TYPE_PANIC, exit_status = 0, timestamp = 0x0}
        args = 0xbfaff5a4 "ϥv\267Z"
#6  0xb770a845 in mail_search_args_init_sub (args=<optimized out>, arg=0x8e6cee8, change_uidsets=false,
    search_saved_uidset=0x0) at mail-search.c:90
        thread_args = <optimized out>
        keywords = {0x8e6cf40 "lists", 0x0}
        __FUNCTION__ = "mail_search_args_init_sub"
#7  0xb77320d3 in search_result_update_search (changed_uids_arr=0x8e87030, result=0x8e58ed0)
    at index-search-result.c:69
        search_ctx = <optimized out>
        changed_uids = 0x8e46b30
        next_uid = 29224
        ret = <optimized out>
        t = <optimized out>
        mail = <optimized out>
        changed_count = 1
        changed_idx = 0
#8  index_search_result_update_flags (result=0x8e58ed0, uids=0x8e87030) at index-search-result.c:131
        search_arg = {next = 0x8e6cee8, type = SEARCH_UIDSET, value = {subargs = 0x0, seqset = {arr = {
                buffer = 0x8e740e8, element_size = 8}, v = 0x8e740e8, v_modifiable = 0x8e740e8}, str = 0x0,
            time = 0, size = 0, flags = 0, search_flags = 0, date_type = 0, thread_type = MAIL_THREAD_NONE,
            keywords = 0x0, modseq = 0x0, search_args = 0x0, search_result = 0x0, mailbox_glob = 0x0},
          context = 0x0, hdr_field_name = 0x0, match_not = 0, match_always = 0, nonmatch_always = 0,
          fuzzy = 0, result = 0}
        ret = 0
        __FUNCTION__ = "index_search_result_update_flags"
#9  0xb77394f9 in search_result_update (result=0x8e58ed0, ctx=0x8e87010) at index-sync-search.c:75
No locals.
#10 index_sync_search_results_update (ctx=0x8e87010) at index-sync-search.c:88
        results = 0x9060740
        i = <optimized out>
        count = 3
#11 0xb7738855 in index_mailbox_sync_deinit (_ctx=0x8e87010, status_r=0xbfaffa3c) at index-sync.c:386
        ctx = 0x8e87010
        sync_rec = {seq1 = 3077094660, seq2 = 148987872, type = 0}
        delayed_expunges = false
        ret = 0
#12 0xb74970a6 in fts_sync_deinit (ctx=0x8e87010, status_r=0xbfaffa3c) at fts-storage.c:584
        box = 0x9060580
        fbox = 0x9060898
        flist = 0x8e16060
        ret = 0
#13 0xb770f7fa in mailbox_sync_deinit (_ctx=0xbfaffa40, status_r=0xbfaffa3c) at mail-storage.c:1347
        ctx = <optimized out>
        box = 0x9060580
        errormsg = <optimized out>
        error = <optimized out>
        ret = <optimized out>
#14 0xb7487ac2 in virtual_sync_backend_box_sync (sync_flags=<optimized out>, bbox=0x8e632a8, ctx=0x8e8dda8)
    at virtual-sync.c:973
        uidmap = <optimized out>
        sync_rec = {seq1 = 22114, seq2 = 22114, type = MAILBOX_SYNC_TYPE_FLAGS}
        idx1 = <optimized out>
        vuid = <optimized out>
        sync_ctx = 0x0
        sync_status = {sync_delayed_expunges = 0}
        idx2 = <optimized out>
        vseq = 149273152
#15 virtual_sync_backend_box (bbox=0x8e632a8, ctx=0x8e8dda8) at virtual-sync.c:1067
        sync_flags = <optimized out>
        status = {messages = 3077174859, recent = 148890672, unseen = 152726112, uidvalidity = 3215980904,
          uidnext = 3077353460, first_unseen_seq = 149046960, first_recent_uid = 149450720,
          last_cached_seq = 543664, highest_modseq = 13217152038154990465, keywords = 0x8df63a0,
          permanent_flags = 3077174635, nonpermanent_modseqs = 0, permanent_keywords = 0,
          allow_new_keywords = 1}
        ret = <optimized out>
#16 virtual_sync_backend_boxes (ctx=0x8e8dda8) at virtual-sync.c:1399
        bboxes = 0x9079798
        i = <optimized out>
        count = 1
#17 virtual_sync (flags=0, mbox=0x8e62e18) at virtual-sync.c:1496
        ctx = 0x8e8dda8
        index_sync_flags = <optimized out>
        ret = <optimized out>
#18 virtual_storage_sync_init (box=0x8e62e18, flags=0) at virtual-sync.c:1516
        mbox = 0x8e62e18
        sync_ctx = <optimized out>
        ret = <optimized out>
#19 0xb770f769 in mailbox_sync_init (box=0x8e62e18, flags=0) at mail-storage.c:1324
        _data_stack_cur_id = 4
        ctx = <optimized out>
#20 0x08060294 in imap_sync_init (client=0x8e17628, box=0x8e62e18, imap_flags=0, flags=0) at imap-sync.c:142
        ctx = 0x8e5ba40
        __FUNCTION__ = "imap_sync_init"
#21 0x08052262 in idle_sync_now (box=<optimized out>, ctx=0x8e17eb8) at cmd-idle.c:145
        __FUNCTION__ = "idle_sync_now"
#22 0x080523f3 in cmd_idle (cmd=0x8e17e30) at cmd-idle.c:276
        client = 0x8e17628
        ctx = 0x8e17eb8
#23 0x080591cd in command_exec (cmd=0x8e17e30) at imap-commands.c:148
        hook = 0x8dff260
        ret = <optimized out>
#24 0x0805815f in client_command_input (cmd=0x8e17e30) at imap-client.c:682
        client = 0x8e17628
        command = <optimized out>
        __FUNCTION__ = "client_command_input"
#25 0x08058230 in client_command_input (cmd=0x8e17e30) at imap-client.c:733
        client = 0x8e17628
        command = <optimized out>
        __FUNCTION__ = "client_command_input"
#26 0x0805847d in client_handle_next_command (remove_io_r=<optimized out>, client=0x8e17628)
    at imap-client.c:774
        size = 12
#27 client_handle_input (client=0x8e17628) at imap-client.c:786
        _data_stack_cur_id = 3
        ret = false
        remove_io = false
        handled_commands = false
        __FUNCTION__ = "client_handle_input"
#28 0x08058daf in client_input (client=0x8e17628) at imap-client.c:825
        cmd = <optimized out>
        output = 0x8e16bfc
        bytes = 12
        __FUNCTION__ = "client_input"
#29 0xb769ff92 in io_loop_call_io (io=0x8f49090) at ioloop.c:379
        ioloop = 0x8dfe400
        t_id = 2
#30 0xb76a0f43 in io_loop_handler_run (ioloop=0x8dfe400) at ioloop-epoll.c:213
        ctx = 0x8dfe5e0
        events = <optimized out>
        event = 0x8dfe620
        list = 0x8e16c90
        io = <optimized out>
        tv = {tv_sec = 1791, tv_usec = 756031}
        events_count = 148991120
        msecs = 1
        ret = 1
        i = <optimized out>
        j = <optimized out>
        call = <optimized out>
#31 0xb769fa30 in io_loop_run (ioloop=0x8dfe400) at ioloop.c:398
No locals.
#32 0xb768880d in master_service_run (service=0x8dfe330, callback=0x80612f0 <client_connected>)
    at master-service.c:543
No locals.
#33 0x08061c71 in main (argc=1, argv=0x8dfe1c0) at main.c:389
        set_roots = {0x80645e0, 0x0}
        login_set = {auth_socket_path = 0x8df6060 "/var/run/dovecot/auth-master",
          postlogin_socket_path = 0x0, postlogin_timeout_secs = 60,
          callback = 0x8061720 <login_client_connected>, failure_callback = 0x8061430 <login_client_failed>}
        service_flags = <optimized out>
        storage_service_flags = <optimized out>
        username = <optimized out>
        c = <optimized out>