#0  0x00007ff2b6e16405 in raise () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007ff2b6e19680 in abort () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#2  0x00007ff2b71b7e08 in default_fatal_finish (type=LOG_TYPE_PANIC, status=0) at failures.c:187
        backtrace = 0x1ffe7f8 "/usr/local/lib/dovecot/libdovecot.so.0(+0x4fde1) [0x7ff2b71b7de1] -> /usr/local/lib/dovecot/libdovecot.so.0(+0x510c7) [0x7ff2b71b90c7] -> /usr/local/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7ff2b71b8"...
#3  0x00007ff2b71b90c7 in i_internal_fatal_handler (ctx=0x7fff28ca9070, format=0x7ff2b71efb38 "file %s: line %d (%s): assertion failed: (%s)", args=0x7fff28ca9058) at failures.c:645
        status = 0
#4  0x00007ff2b71b80f1 in i_panic (format=0x7ff2b71efb38 "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 = 0x7fff28ca9140, reg_save_area = 0x7fff28ca9080}}
#5  0x00007ff2b71d52b7 in o_stream_sendv (stream=0x20350c8, iov=0x7fff28ca91b0, iov_count=1) at ostream.c:173
        _stream = 0x2035040
        i = 1
        total_size = 1
        ret = -1
        __FUNCTION__ = "o_stream_sendv"
#6  0x00007ff2b71d51ad in o_stream_send (stream=0x20350c8, data=0x7fff28ca9207, size=1) at ostream.c:150
        iov = {iov_base = 0x7fff28ca9207, iov_len = 1}
#7  0x0000000000417ff4 in imap_fetch_send (ctx=0x202e598, output=0x20350c8, input=0x20bfc90, cr_skipped=false, virtual_size=908982, add_missing_eoh=false, last_cr=0x202e640) at imap-fetch-body.c:163
        msg = 0x20c6418 "\nofGng…8<[snipped]>8…zfMNW4nyRyK4"...
        i = 77
        size = 1314
        vsize_left = 688658
        sent = 220323
        ret = 77
        add = 13 '\r'
        blocks = false
#8  0x000000000041823c in fetch_stream_send (ctx=0x202e598) at imap-fetch-body.c:219
        ret = 4291850
#9  0x00000000004185ec in fetch_stream (ctx=0x202e598, size=0x7fff28ca9340) at imap-fetch-body.c:299
        input = 0x400000064
#10 0x00000000004187a3 in fetch_data (ctx=0x202e598, body=0x20a7af0, size=0x7fff28ca9340) at imap-fetch-body.c:332
        str = 0x1ffe4a0
#11 0x0000000000418952 in fetch_body (ctx=0x202e598, mail=0x20a8d40, body=0x20a7af0) at imap-fetch-body.c:375
        fetch_size = 0x7fff28ca9340
        input = 0x20bfc90
        hdr_size = {physical_size = 140733877752720, virtual_size = 4286334, lines = 684364688}
        body_size = {physical_size = 897166, virtual_size = 908982, lines = 0}
#12 0x0000000000416b34 in imap_fetch_more_int (ctx=0x202e598) at imap-fetch.c:461
        h = 0x202e938
        _data_stack_cur_id = 4
        client = 0x202d8c0
        handlers = 0x202e8e8
        count = 3
        ret = 1
        __FUNCTION__ = "imap_fetch_more_int"
#13 0x0000000000416d8e in imap_fetch_more (ctx=0x202e598) at imap-fetch.c:513
        ret = 0
        __FUNCTION__ = "imap_fetch_more"
#14 0x000000000040b816 in cmd_fetch (cmd=0x202e450) at cmd-fetch.c:224
        client = 0x202d8c0
        ctx = 0x202e598
        args = 0x2030ca8
        next_arg = 0x2030cf8
        list_arg = 0x7fff28ca9870
        search_args = 0x20a9f20
        messageset = 0x2030dd8 "21:98,100:104,131:191,201:202,206:332"
        ret = 1
#15 0x00000000004144d8 in command_exec (cmd=0x202e450) at imap-commands.c:147
        hook = 0x2007ca0
        ret = false
#16 0x00000000004117d9 in cmd_uid (cmd=0x202e450) at cmd-uid.c:27
        command = 0x2007980
        cmd_name = 0x2030dd0 "fetch"
#17 0x00000000004144d8 in command_exec (cmd=0x202e450) at imap-commands.c:147
        hook = 0x2007ca0
        ret = false
#18 0x00000000004134f0 in client_command_input (cmd=0x202e450) at imap-client.c:673
        client = 0x202d8c0
        command = 0x7fff28ca9560
        __FUNCTION__ = "client_command_input"
#19 0x000000000041374f in client_command_input (cmd=0x202e450) at imap-client.c:724
        client = 0x202d8c0
        command = 0x2007938
        __FUNCTION__ = "client_command_input"
#20 0x000000000041387a in client_handle_next_command (client=0x202d8c0, remove_io_r=0x7fff28ca95fd) at imap-client.c:765
        size = 82
#21 0x00000000004138fa in client_handle_input (client=0x202d8c0) at imap-client.c:777
        _data_stack_cur_id = 3
        ret = false
        remove_io = false
        handled_commands = false
        __FUNCTION__ = "client_handle_input"
#22 0x0000000000413a70 in client_input (client=0x202d8c0) at imap-client.c:816
        cmd = 0x2022dc8
        output = 0x20350c8
        bytes = 82
        __FUNCTION__ = "client_input"
#23 0x00007ff2b71ca8ff in io_loop_call_io (io=0x209ce00) at ioloop.c:377
        ioloop = 0x2006660
        t_id = 2
#24 0x00007ff2b71cc430 in io_loop_handler_run (ioloop=0x2006660) at ioloop-epoll.c:213
        ctx = 0x20069b0
        events = 0x2006a20
        event = 0x2006a20
        list = 0x202e3b0
        io = 0x209ce00
        tv = {tv_sec = 4, tv_usec = 970081}
        events_count = 6
        msecs = 4971
        ret = 1
        i = 0
        j = 0
        call = true
#25 0x00007ff2b71ca9a2 in io_loop_run (ioloop=0x2006660) at ioloop.c:396
No locals.
#26 0x00007ff2b71afb92 in master_service_run (service=0x2006510, callback=0x41faff <client_connected>) at master-service.c:507
No locals.
#27 0x000000000041fd89 in main (argc=1, argv=0x2006370) at main.c:375
        set_roots = {0x423120, 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