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    <font size="-1"><font face="Calibri">Hi everyone,<br>
        <br>
        I am running into a problem when trying to use fts_squat in a
        virtual folder. Without fts_squat plugin the search (from,
        subject...) works in all folders. With activated fts the search
        on the inbox folders works expectedly well but any attempt to
        search anything in any virtual folder leads to the following
        error. Similarly when attempting "doveadm fts lookup". I also
        noticed that no search index for the virtual folders gets build
        - is this expected behaviour?<br>
      </font></font>
    <blockquote><font size="-1"><font face="Calibri">Mar 14 23:14:58 ***
          dovecot: service=imap, user=***, ip=[::1]. Panic: file
          mail-storage.c: line 1913 (mailbox_get_open_status): assertion
          failed: (box->opened)</font></font><br>
      <font size="-1"><font face="Calibri">Mar 14 23:14:58 *** dovecot:
          service=imap, user=***, ip=[::1]. Error: Raw backtrace:
          /usr/lib/x86_64-linux-gnu/dovecot/libdovecot.so.0(+0xba731)
          [0x7f553a7ff731] ->
          /usr/lib/x86_64-linux-gnu/dovecot/libdovecot.so.0(+0xba7fa)
          [0x7f553a7ff7fa] ->
          /usr/lib/x86_64-linux-gnu/dovecot/libdovecot.so.0(i_fatal+0)
          [0x7f553a771638] ->
/usr/lib/x86_64-linux-gnu/dovecot/libdovecot-storage.so.0(mailbox_get_open_status+0x68)
          [0x7f553aae4a78] ->
          /usr/lib/dovecot/modules/lib21_fts_squat_plugin.so(+0x3684)
          [0x7f553677a684] ->
          /usr/lib/dovecot/modules/lib21_fts_squat_plugin.so(+0x3820)
          [0x7f553677a820] ->
/usr/lib/dovecot/modules/lib20_fts_plugin.so(fts_backend_lookup_multi+0x163)
          [0x7f5539b016a3] ->
          /usr/lib/dovecot/modules/lib20_fts_plugin.so(+0xd728)
          [0x7f5539b06728] ->
          /usr/lib/dovecot/modules/lib20_fts_plugin.so(fts_search_lookup+0xeb)
          [0x7f5539b06bbb] ->
          /usr/lib/dovecot/modules/lib20_fts_plugin.so(+0xf8b8)
          [0x7f5539b088b8] -> dovecot/imap(imap_search_start+0x6a)
          [0x5654cb5a0d6a] -> dovecot/imap(cmd_sort+0x293)
          [0x5654cb593553] -> dovecot/imap(command_exec+0x64)
          [0x5654cb599874] -> dovecot/imap(+0x1bd22) [0x5654cb597d22]
          -> dovecot/imap(+0x1bdbc) [0x5654cb597dbc] ->
          dovecot/imap(client_handle_input+0x1b5) [0x5654cb5981c5] ->
          dovecot/imap(client_input+0xa4) [0x5654cb5987e4] ->
          /usr/lib/x86_64-linux-gnu/dovecot/libdovecot.so.0(io_loop_call_io+0x69)
          [0x7f553a8174a9] ->
/usr/lib/x86_64-linux-gnu/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x12e)
          [0x7f553a818d1e] ->
/usr/lib/x86_64-linux-gnu/dovecot/libdovecot.so.0(io_loop_handler_run+0x4c)
          [0x7f553a8175ac] ->
          /usr/lib/x86_64-linux-gnu/dovecot/libdovecot.so.0(io_loop_run+0x38)
          [0x7f553a8177b8] ->
/usr/lib/x86_64-linux-gnu/dovecot/libdovecot.so.0(master_service_run+0x13)
          [0x7f553a7940a3] -> dovecot/imap(main+0x339)
          [0x5654cb58a539] ->
          /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)
          [0x7f553a375b97] -> dovecot/imap(_start+0x2a)
          [0x5654cb58a71a]</font></font><br>
      <font size="-1"><font face="Calibri">Mar 14 23:14:58 *** dovecot:
          service=imap, user=***, ip=[::1]. Fatal: master:
          service(imap): child 6436 killed with signal 6 (core dumps
          disabled)<br>
        </font></font></blockquote>
    <font size="-1"><font face="Calibri">This is my config:<br>
      </font></font>
    <blockquote><font size="-1"><font face="Calibri"># 2.3.0.1
          (ffd8a29): /etc/dovecot/dovecot.conf<br>
          # Pigeonhole version 0.5.0.1 (d33dca20)<br>
          # OS: Linux 4.15.0-46-generic x86_64 Ubuntu 18.04.2 LTS ext4<br>
          auth_mechanisms = plain login digest-md5 cram-md5 apop<br>
          auth_username_chars =
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890&.-_@'<br>
          default_vsz_limit = 8096 M<br>
          disable_plaintext_auth = no<br>
          first_valid_uid = 30<br>
          imap_client_workarounds = delay-newmail<br>
          imap_logout_format = rcvd=%i, sent=%o<br>
          mail_home = /var/qmail/mailnames/%Ld/%Ln<br>
          mail_location = maildir:/var/qmail/mailnames/%Ld/%Ln/Maildir<br>
          mail_log_prefix = "service=%s, user=%u, ip=[%r]. "<br>
          mail_max_userip_connections = 100<br>
          mail_plugins = quota fts fts_squat virtual<br>
          managesieve_logout_format = rcvd=%i, sent=%o<br>
          managesieve_notify_capability = mailto<br>
          managesieve_sieve_capability = fileinto reject envelope
          encoded-character vacation subaddress
          comparator-i;ascii-numeri$<br>
          namespace inbox {<br>
            inbox = yes<br>
            location =<br>
            prefix = INBOX.<br>
            separator = .<br>
          }<br>
          namespace virtual {<br>
            hidden = no<br>
            inbox = no<br>
            list = yes<br>
            location =
virtual:/var/qmail/mailnames/%Ld/%Ln/virtual/:INDEX=/var/qmail/mailnames/%Ld/%Ln/virtual/<br>
            prefix =<br>
            separator = .<br>
          }<br>
          passdb {<br>
            driver = plesk<br>
          }<br>
          plugin {<br>
            fts = squat<br>
            fts_squat = partial=4 full=10<br>
            quota = maildir:User quota<br>
            quota_grace = 0<br>
            sieve = ~/.dovecot.sieve<br>
            sieve_dir = ~/sieve<br>
            sieve_extensions = +notify +imapflags<br>
          }<br>
          pop3_client_workarounds = outlook-no-nuls oe-ns-eoh<br>
          pop3_logout_format = rcvd=%i, sent=%o, top=%t/%p, retr=%r/%b,
          del=%d/%m, size=%s<br>
          protocols = imap pop3 sieve<br>
          service auth-worker {<br>
            group =<br>
            user =<br>
          }<br>
          service auth {<br>
            group =<br>
            unix_listener auth-userdb {<br>
              group = popuser<br>
              mode = 0600<br>
              user = popuser<br>
            }<br>
            user =<br>
          }<br>
          service imap-login {<br>
            process_limit = 2048<br>
            service_count = 1<br>
          }<br>
          service imap {<br>
            process_limit = 2048<br>
            service_count = 1<br>
          }<br>
          service pop3-login {<br>
            process_limit = 2048<br>
            service_count = 1<br>
          }<br>
          service pop3 {<br>
            process_limit = 2048<br>
            service_count = 1<br>
          }<br>
          ssl_cert = </etc/dovecot/private/dovecot.pem<br>
          ssl_cipher_list = HIGH:!aNULL:!MD5<br>
          ssl_dh =  # hidden, use -P to show it<br>
          ssl_key =  # hidden, use -P to show it<br>
          ssl_prefer_server_ciphers = yes<br>
          userdb {<br>
            args = uid=popuser gid=popuser<br>
            driver = static<br>
          }<br>
          protocol imap {<br>
            mail_plugins = quota fts fts_squat virtual imap_quota<br>
          }<br>
          protocol pop3 {<br>
            pop3_uidl_format = UID%u-%v<br>
          }<br>
          protocol sieve {<br>
            mail_plugins = quota fts fts_squat virtual<br>
          }<br>
          protocol lda {<br>
            mail_plugins = quota fts fts_squat virtual sieve<br>
          }<br>
        </font></font></blockquote>
    <font size="-1"><font face="Calibri">dovecot --version -> 2.3.0.1
        (ffd8a29)<br>
        <br>
        I will be greatful for any tips hinting me on how to resolve
        this behaviour. Thank you very much in advance<br>
        Benjamin<br>
      </font></font><br>
    <br>
    <br>
    <br>
    <font size="-1"><font face="Calibri"><br>
        <br>
      </font></font>
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