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    <p>Hi,</p>
    <p>I have the same error in my replica server, it appears many times
      per day.</p>
    <p>Log:</p>
    <p><font size="2"><i>Dec 13 13:01:23 Error:
          doveadm(xxx)<25513><vsFCF5w1t2GpYwAAbKtC3g>:
          read(xxx.xxx.xxx) failed: EOF (last sent=mailbox, last
          recv=mailbox)</i><i><br>
        </i><i>Dec 13 13:34:43 Warning:
          doveadm(xxx)<26277><9e2rJOM9t2GlZgAAbKtC3g>:
          /mnt/mail-storage-lv0003/xxx/Maildir/dovecot-uidlist:
          Duplicate file entry at line 2162:
          1639396906.M258993P16725.xxx,S=7304,W=7467 (uid 71966 ->
          71970)</i><i><br>
        </i><i>Dec 13 14:26:20 Error: doveadm(27294): write(xxx) failed:
          Timed out after 60 seconds</i><i><br>
        </i><i>Dec 13 14:26:20 Panic: doveadm(27294): file ioloop.c:
          line 865 (io_loop_destroy): assertion failed: (ioloop ==
          current_ioloop)</i><i><br>
        </i><i>Dec 13 14:26:20 Error: doveadm(27294): Raw backtrace:
          /usr/lib/dovecot/libdovecot.so.0(backtrace_append+0x3d)
          [0x7f74d96f96ed] ->
          /usr/lib/dovecot/libdovecot.so.0(backtrace_get+0x1e)
          [0x7f74d96f980e] ->
          /usr/lib/dovecot/libdovecot.so.0(+0xff5cb) [0x7f74d97065cb]
          -> /usr/lib/dovecot/libdovecot.so.0(+0xff661)
          [0x7f74d9706661] ->
          /usr/lib/dovecot/libdovecot.so.0(+0x54a45) [0x7f74d965ba45]
          -> /usr/lib/dovecot/libdovecot.so.0(+0x57d95)
          [0x7f74d965ed95] -> dovecot/doveadm-server(+0x4af0f)
          [0x556a7a4b4f0f] ->
          dovecot/doveadm-server(doveadm_print_flush+0x1f)
          [0x556a7a4ae7af] ->
          dovecot/doveadm-server(doveadm_cmd_ver2_to_mail_cmd_wrapper+0x32b)
          [0x556a7a49dbcb] ->
          dovecot/doveadm-server(doveadm_cmd_run_ver2+0x4f7)
          [0x556a7a4ae307] -> dovecot/doveadm-server(+0x4874a)
          [0x556a7a4b274a] ->
          /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x69)
          [0x7f74d971c679] ->
          /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x131)
          [0x7f74d971dc61] ->
          /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x4c)
          [0x7f74d971c71c] ->
          /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x40)
          [0x7f74d971c8a0] ->
          /usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13)
          [0x7f74d96903d3] -> dovecot/doveadm-server(main+0x102)
          [0x556a7a48d9f2] ->
          /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb)
          [0x7f74d92e709b] -> dovecot/doveadm-server(_start+0x2a)
          [0x556a7a48da7a]</i><i><br>
        </i><i>Dec 13 14:26:20 Fatal: doveadm(27294): master:
          service(doveadm): child 27294 killed with signal 6 (core dumps
          disabled - <a class="moz-txt-link-freetext" href="https://dovecot.org/bugreport.html#coredumps">https://dovecot.org/bugreport.html#coredumps</a>)</i><i><br>
        </i><i>Dec 13 14:29:06 Error: doveadm(27364): write(xxx) failed:
          Timed out after 60 seconds</i><i><br>
        </i><i>Dec 13 14:29:06 Panic: doveadm(27364): file ioloop.c:
          line 865 (io_loop_destroy): assertion failed: (ioloop ==
          current_ioloop)</i><i><br>
        </i><i>Dec 13 14:29:06 Error: doveadm(27364): Raw backtrace:
          /usr/lib/dovecot/libdovecot.so.0(backtrace_append+0x3d)
          [0x7f05717756ed] ->
          /usr/lib/dovecot/libdovecot.so.0(backtrace_get+0x1e)
          [0x7f057177580e] ->
          /usr/lib/dovecot/libdovecot.so.0(+0xff5cb) [0x7f05717825cb]
          -> /usr/lib/dovecot/libdovecot.so.0(+0xff661)
          [0x7f0571782661] ->
          /usr/lib/dovecot/libdovecot.so.0(+0x54a45) [0x7f05716d7a45]
          -> /usr/lib/dovecot/libdovecot.so.0(+0x57d95)
          [0x7f05716dad95] -> dovecot/doveadm-server(+0x4af0f)
          [0x558edcd93f0f] ->
          dovecot/doveadm-server(doveadm_print_flush+0x1f)
          [0x558edcd8d7af] ->
          dovecot/doveadm-server(doveadm_cmd_ver2_to_mail_cmd_wrapper+0x32b)
          [0x558edcd7cbcb] ->
          dovecot/doveadm-server(doveadm_cmd_run_ver2+0x4f7)
          [0x558edcd8d307] -> dovecot/doveadm-server(+0x4874a)
          [0x558edcd9174a] ->
          /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x69)
          [0x7f0571798679] ->
          /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x131)
          [0x7f0571799c61] ->
          /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x4c)
          [0x7f057179871c] ->
          /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x40)
          [0x7f05717988a0] ->
          /usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13)
          [0x7f057170c3d3] -> dovecot/doveadm-server(main+0x102)
          [0x558edcd6c9f2] ->
          /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb)
          [0x7f057136309b] -> dovecot/doveadm-server(_start+0x2a)
          [0x558edcd6ca7a]</i><i><br>
        </i><i>Dec 13 14:29:06 Fatal: doveadm(27364): master:
          service(doveadm): child 27364 killed with signal 6 (core dumps
          disabled - <a class="moz-txt-link-freetext" href="https://dovecot.org/bugreport.html#coredumps">https://dovecot.org/bugreport.html#coredumps</a>)</i></font></p>
    <p>My 'dovecot.conf':<font size="2"><i><br>
        </i></font></p>
    <p><font size="1"><i># 2.3.17.1 (476cd46418):
          /etc/dovecot/dovecot.conf<br>
          # Pigeonhole version 0.5.17.1 (a1a0b892)<br>
          # OS: Linux 4.19.0-18-amd64 x86_64 Debian 10.11 <br>
          # Hostname: xxx<br>
          auth_mechanisms = plain login<br>
          default_vsz_limit = 1 G<br>
          doveadm_password = # hidden, use -P to show it<br>
          doveadm_port = xxx<br>
          mail_gid = 501<br>
          mail_location = <a class="moz-txt-link-freetext" href="maildir:~/Maildir:INDEX=/var/indexes/%n">maildir:~/Maildir:INDEX=/var/indexes/%n</a><br>
          mail_max_userip_connections = 50<br>
          mail_plugins = " notify replication"<br>
          mail_privileged_group = vmail<br>
          mail_uid = 501<br>
          managesieve_notify_capability = mailto<br>
          managesieve_sieve_capability = fileinto reject envelope
          encoded-character vacation subaddress
          comparator-i;ascii-numeric relational regex imap4flags copy
          include variables body enotify environment mailbox date index
          ihave duplicate mime foreverypart extracttext vacation-seconds
          imapflags notify<br>
          namespace inbox {<br>
            inbox = yes<br>
            location = <br>
            mailbox Drafts {<br>
              special_use = \Drafts<br>
            }<br>
            mailbox Junk {<br>
              special_use = \Junk<br>
            }<br>
            mailbox "Posta inviata" {<br>
              special_use = \Sent<br>
            }<br>
            mailbox Sent {<br>
              special_use = \Sent<br>
            }<br>
            mailbox "Sent Messages" {<br>
              special_use = \Sent<br>
            }<br>
            mailbox Trash {<br>
              special_use = \Trash<br>
            }<br>
            prefix = <br>
          }<br>
          passdb {<br>
            args = /etc/dovecot/dovecot-ldap.conf<br>
            driver = ldap<br>
          }<br>
          plugin {<br>
            mail_replica = <a class="moz-txt-link-freetext" href="tcp:xxx">tcp:xxx</a><br>
            sieve =
          <a class="moz-txt-link-freetext" href="file:/var/www/html/ooo/%n;active=/var/www/html/ooo/%n/script">file:/var/www/html/ooo/%n;active=/var/www/html/ooo/%n/script</a><br>
            sieve_default = /var/www/html/ooo/default.sieve<br>
            sieve_duplicate_default_period = 14d<br>
            sieve_duplicate_max_period = 7d<br>
            sieve_extensions = +duplicate +notify +imapflags
          +vacation-seconds<br>
            sieve_user_log = /var/www/html/ooo/%n/sieve_error.log<br>
          }<br>
          protocols = " imap lmtp sieve pop3"<br>
          replication_max_conns = 1<br>
          service aggregator {<br>
            fifo_listener replication-notify-fifo {<br>
              user = vmail<br>
            }<br>
            unix_listener replication-notify {<br>
              user = vmail<br>
            }<br>
          }<br>
          service auth {<br>
            unix_listener /var/spool/postfix/private/auth {<br>
              group = postfix<br>
              mode = 0660<br>
              user = postfix<br>
            }<br>
            unix_listener auth-master {<br>
              group = vmail<br>
              mode = 0660<br>
              user = vmail<br>
            }<br>
          }<br>
          service doveadm {<br>
            inet_listener {<br>
              port = 12345<br>
            }<br>
          }<br>
          service imap-login {<br>
            process_limit = 200<br>
          }<br>
          service lmtp {<br>
            process_min_avail = 5<br>
            unix_listener /var/spool/postfix/private/dovecot-lmtp {<br>
              group = postfix<br>
              mode = 0600<br>
              user = postfix<br>
            }<br>
            user = vmail<br>
          }<br>
          service managesieve-login {<br>
            inet_listener sieve {<br>
              port = 4190<br>
            }<br>
            process_min_avail = 10<br>
            service_count = 1<br>
          }<br>
          service replicator {<br>
            process_min_avail = 1<br>
            unix_listener replicator-doveadm {<br>
              mode = 0666<br>
              user = vmail<br>
            }<br>
          }<br>
          service stats {<br>
            unix_listener stats-reader {<br>
              group = vmail<br>
              mode = 0666<br>
              user = vmail<br>
            }<br>
            unix_listener stats-writer {<br>
              group = vmail<br>
              mode = 0666<br>
              user = vmail<br>
            }<br>
          }<br>
          ssl_cert = </etc/dovecot/private/chain-star_xxx.pem<br>
          ssl_cipher_list =
          <a class="moz-txt-link-freetext" href="ALL:!LOW:!aNULL:!eNULL:!SSLv2:!RC4:!MD5:!DES:!EXP:!SEED:!IDEA:!3DES">ALL:!LOW:!aNULL:!eNULL:!SSLv2:!RC4:!MD5:!DES:!EXP:!SEED:!IDEA:!3DES</a><br>
          ssl_dh = # hidden, use -P to show it<br>
          ssl_key = # hidden, use -P to show it<br>
          userdb {<br>
            args = /etc/dovecot/dovecot-ldap.conf<br>
            driver = ldap<br>
          }<br>
          protocol lmtp {<br>
            mail_plugins = " notify replication sieve quota"<br>
            postmaster_address = postmaster@xxx<br>
          }<br>
          protocol lda {<br>
            auth_socket_path = /var/run/dovecot/auth-master<br>
            hostname = xxx<br>
            mail_plugins = " notify replication sieve quota"<br>
          }<br>
          protocol sieve {<br>
            mail_max_userip_connections = 10<br>
            managesieve_implementation_string = Dovecot Pigeonhole<br>
            managesieve_logout_format = bytes=%i/%o<br>
            managesieve_max_compile_errors = 5<br>
            managesieve_max_line_length = 64 k<br>
          }</i></font><br>
    </p>
    <p>My 'dovecot-ldap.conf':</p>
    <p><i><font size="2">hosts = xxx<br>
          base = dc=xxx,dc=lan<br>
          ldap_version=3<br>
          auth_bind = yes<br>
          dn = cn=xxx,cn=xxx,dc=xxx,dc=lan<br>
          dnpass = #hidden<br>
          scope = subtree<br>
          #user_attrs =
          sAMAccountName=home=/mnt/mail-storage-lv0003/%$,=uid=501,=gid=501<br>
          user_attrs =
          sAMAccountName=user,=home=/mnt/mail-storage-lv0003/%n,=uid=501,=gid=501<br>
          pass_attrs = sAMAccountName=user<br>
          user_filter = (&(objectclass=person)(samaccountname=%n))<br>
          pass_filter= (&(objectclass=person)(samaccountname=%n))<br>
          iterate_attrs = sAMAccountName=user<br>
          # With following filter we exclude all objects without an
          email address, all computers and all inactive accounts<br>
          iterate_filter =
(&(objectCategory=person)(mail=*)(objectClass=user)(!(<a class="moz-txt-link-freetext" href="userAccountControl:1.2.840.113556.1.4.803:=2">userAccountControl:1.2.840.113556.1.4.803:=2</a>)))</font></i><br>
    </p>
    <p>Regards<br>
    </p>
    <div class="moz-cite-prefix">On 19/11/21 10:27, Andreas Piper wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:03ee3069-bcb2-b9b3-96c7-d5af6c8b1efc@hrz.uni-marburg.de">Hello,
      <br>
      <br>
      as these 'Panic'-Events continue to appear every few minutes in my
      replicator-log, I would like to ask, if you have any hints how to
      repair the correlated mailbox?
      <br>
      <br>
      Andreas
      <br>
      <br>
      Am 11.11.21 um 15:04 schrieb Piper Andreas:
      <br>
      <blockquote type="cite">Hello,
        <br>
        <br>
        <blockquote type="cite">Can you install dovecot debug symbols
          and redo the gdb backtrace? Package name is likely
          `dovecot-dbg`.
          <br>
          <br>
        </blockquote>
        <br>
        done, thanks for the hint.
        <br>
        <br>
        Andreas
        <br>
        <br>
        (gdb) bt
        <br>
        #0  __GI_raise (sig=sig@entry=6) at
        ../sysdeps/unix/sysv/linux/<a class="moz-txt-link-freetext" href="raise.c:51">raise.c:51</a>
        <br>
        #1  0x00007f4e58be0921 in __GI_abort () at <a class="moz-txt-link-freetext" href="abort.c:79">abort.c:79</a>
        <br>
        #2  0x00007f4e59427a11 in default_fatal_finish (status=0,
        type=LOG_TYPE_PANIC) at <a class="moz-txt-link-freetext" href="failures.c:459">failures.c:459</a>
        <br>
        #3  fatal_handler_real (ctx=<optimized out>,
        format=<optimized out>, args=<optimized out>) at
        <a class="moz-txt-link-freetext" href="failures.c:471">failures.c:471</a>
        <br>
        #4  0x00007f4e59427b01 in i_internal_fatal_handler
        (ctx=<optimized out>, format=<optimized out>,
        args=<optimized out>)
        <br>
             at <a class="moz-txt-link-freetext" href="failures.c:872">failures.c:872</a>
        <br>
        #5  0x00007f4e593744a7 in i_panic
        (format=format@entry=0x7f4e5946ab88 "file %s: line %d (%s):
        assertion failed: (%s)")
        <br>
             at <a class="moz-txt-link-freetext" href="failures.c:524">failures.c:524</a>
        <br>
        #6  0x00007f4e5944121c in io_loop_destroy
        (_ioloop=_ioloop@entry=0x7ffd0e203e68) at <a class="moz-txt-link-freetext" href="ioloop.c:865">ioloop.c:865</a>
        <br>
        #7  0x0000563d0150ffb6 in doveadm_print_server_flush () at
        <a class="moz-txt-link-freetext" href="doveadm-print-server.c:106">doveadm-print-server.c:106</a>
        <br>
        #8  0x0000563d01508fb7 in doveadm_print (
        <br>
             value=0x563d0269ced8
        "AQAAAFoYRziwaStNyDEAAEKX94joZK5JAwAAAAQ", 'A' <repeats 20
        times>, "DAAAAMu73BjjBalfFPQAANPIMJnB2rkkBAAAAAg", 'A'
        <repeats 20 times>,
        "EAAAD3Gkc4sGkrTcgxAABCl/eI02OuSQIAAAAD", 'A' <repeats 21
        times>, "gAAAD4SNQYx691evBkAANXM"...)
        <br>
             at <a class="moz-txt-link-freetext" href="doveadm-print.c:87">doveadm-print.c:87</a>
        <br>
        #9  0x0000563d014f4427 in cmd_dsync_run (_ctx=0x563d01fc7cc8,
        user=<optimized out>) at <a class="moz-txt-link-freetext" href="doveadm-dsync.c:713">doveadm-dsync.c:713</a>
        <br>
        #10 0x0000563d014f6a44 in doveadm_mail_next_user
        (ctx=ctx@entry=0x563d01fc7cc8,
        error_r=error_r@entry=0x7ffd0e204108)
        <br>
             at <a class="moz-txt-link-freetext" href="doveadm-mail.c:462">doveadm-mail.c:462</a>
        <br>
        #11 0x0000563d014f76be in doveadm_mail_single_user
        (ctx=ctx@entry=0x563d01fc7cc8,
        error_r=error_r@entry=0x7ffd0e204108)
        <br>
             at <a class="moz-txt-link-freetext" href="doveadm-mail.c:493">doveadm-mail.c:493</a>
        <br>
        #12 0x0000563d014f7c6f in doveadm_mail_cmd_exec
        (wildcard_user=0x0, ctx=0x563d01fc7cc8) at <a class="moz-txt-link-freetext" href="doveadm-mail.c:654">doveadm-mail.c:654</a>
        <br>
        #13 doveadm_cmd_ver2_to_mail_cmd_wrapper (cctx=<optimized
        out>) at <a class="moz-txt-link-freetext" href="doveadm-mail.c:983">doveadm-mail.c:983</a>
        <br>
        #14 0x0000563d01508c1b in doveadm_cmd_run_ver2
        (argc=argc@entry=9, argv=argv@entry=0x563d01f6b3d0,
        cctx=cctx@entry=0x7ffd0e204260)
        <br>
             at <a class="moz-txt-link-freetext" href="doveadm-cmd.c:465">doveadm-cmd.c:465</a>
        <br>
        #15 0x0000563d0150d612 in doveadm_cmd_server_run_ver2
        (cctx=0x7ffd0e204260, argv=0x563d01f6b3d0, argc=9,
        conn=0x563d01fc1988)
        <br>
             at <a class="moz-txt-link-freetext" href="client-connection-tcp.c:187">client-connection-tcp.c:187</a>
        <br>
        #16 doveadm_cmd_handle (cctx=0x7ffd0e204260, argv=<optimized
        out>, argc=<optimized out>, cmd_name=<optimized
        out>,
        <br>
             conn=0x563d01fc1988) at <a class="moz-txt-link-freetext" href="client-connection-tcp.c:214">client-connection-tcp.c:214</a>
        <br>
        #17 client_handle_command (args=<optimized out>,
        conn=0x563d01fc1988) at <a class="moz-txt-link-freetext" href="client-connection-tcp.c:284">client-connection-tcp.c:284</a>
        <br>
        #18 client_connection_tcp_input (conn=0x563d01fc1988) at
        <a class="moz-txt-link-freetext" href="client-connection-tcp.c:436">client-connection-tcp.c:436</a>
        <br>
        #19 0x00007f4e594406d9 in io_loop_call_io (io=0x563d01fc5950) at
        <a class="moz-txt-link-freetext" href="ioloop.c:737">ioloop.c:737</a>
        <br>
        #20 0x00007f4e59442034 in io_loop_handler_run_internal
        (ioloop=ioloop@entry=0x563d01f73ed0) at <a class="moz-txt-link-freetext" href="ioloop-epoll.c:222">ioloop-epoll.c:222</a>
        <br>
        #21 0x00007f4e594407e0 in io_loop_handler_run
        (ioloop=<optimized out>) at <a class="moz-txt-link-freetext" href="ioloop.c:789">ioloop.c:789</a>
        <br>
        #22 0x00007f4e59440a18 in io_loop_run (ioloop=0x563d01f73ed0) at
        <a class="moz-txt-link-freetext" href="ioloop.c:762">ioloop.c:762</a>
        <br>
        #23 0x00007f4e593a6a23 in master_service_run
        (service=0x563d01f73d30, callback=<optimized out>) at
        <a class="moz-txt-link-freetext" href="master-service.c:863">master-service.c:863</a>
        <br>
        #24 0x0000563d014e6922 in main (argc=<optimized out>,
        argv=<optimized out>) at <a class="moz-txt-link-freetext" href="main.c:124">main.c:124</a>
        <br>
        <br>
      </blockquote>
      <br>
      <br>
    </blockquote>
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