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    <p>Hi,</p>
    <p>after the upgrade to Dovecot 2.3.11.3, from 2.3.10.1, I see
      frequently these errors from different users:</p>
    <p>Aug 18 11:02:35 Panic: indexer-worker(<a
        class="moz-txt-link-abbreviated" href="mailto:info@domain.com"
        moz-do-not-send="true">info@domain.com</a>)
      session=<g71KISOttvS5LNVj:O3ahCyuZO18cYAAAEPCW+w>: file
      http-client-request.c: line 1232 (http_client_request_send_more):
      assertion failed: (req->payload_input != NULL)<br>
      Aug 18 11:02:35 Error: indexer-worker(<a
        class="moz-txt-link-abbreviated" href="mailto:info@domain.com"
        moz-do-not-send="true">info@domain.com</a>)
      session=<g71KISOttvS5LNVj:O3ahCyuZO18cYAAAEPCW+w>: Raw
      backtrace:
      /usr/lib64/dovecot/libdovecot.so.0(backtrace_append+0x2f)
      [0x7f0ee3c828bf] ->
      /usr/lib64/dovecot/libdovecot.so.0(backtrace_get+0x26)
      [0x7f0ee3c829d6] ->
      /usr/lib64/dovecot/libdovecot.so.0(+0xeb7ba) [0x7f0ee3c8d7ba]
      -> /usr/lib64/dovecot/libdovecot.so.0(+0xeb801)
      [0x7f0ee3c8d801] ->
      /usr/lib64/dovecot/libdovecot.so.0(+0x42ff1) [0x7f0ee3be4ff1]
      ->
      /usr/lib64/dovecot/libdovecot.so.0(http_client_request_send_more+0x415)
      [0x7f0ee3c2ba25] ->
      /usr/lib64/dovecot/libdovecot.so.0(http_client_connection_output+0x114)
      [0x7f0ee3c30994] ->
      /usr/lib64/dovecot/libdovecot.so.0(+0x115470) [0x7f0ee3cb7470]
      -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_call_io+0x55)
      [0x7f0ee3ca4eb5] ->
      /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0xdc)
      [0x7f0ee3ca6ebc] ->
      /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0x5c)
      [0x7f0ee3ca4fac] ->
      /usr/lib64/dovecot/libdovecot.so.0(io_loop_run+0x38)
      [0x7f0ee3ca51f8] ->
      /usr/lib64/dovecot/libdovecot.so.0(+0x8a955) [0x7f0ee3c2c955]
      ->
/usr/lib64/dovecot/libdovecot.so.0(http_client_request_finish_payload+0x21)
      [0x7f0ee3c2cbd1] ->
/usr/lib64/dovecot/lib21_fts_solr_plugin.so(solr_connection_post_end+0x45)
      [0x7f0ee1c85d15] ->
      /usr/lib64/dovecot/lib21_fts_solr_plugin.so(+0x3fa0)
      [0x7f0ee1c81fa0] ->
      /usr/lib64/dovecot/lib20_fts_plugin.so(+0x86cc) [0x7f0ee297f6cc]
      ->
      /usr/lib64/dovecot/lib20_fts_plugin.so(fts_backend_update_deinit+0x2c)
      [0x7f0ee297f74c] ->
      /usr/lib64/dovecot/lib20_fts_plugin.so(+0xfd04) [0x7f0ee2986d04]
      -> /usr/lib64/dovecot/lib20_fts_plugin.so(+0xff3f)
      [0x7f0ee2986f3f] ->
      /usr/lib64/dovecot/lib10_quota_plugin.so(+0xf64b) [0x7f0ee2dc764b]
      -> /usr/lib64/dovecot/lib01_acl_plugin.so(+0xde43)
      [0x7f0ee2fdce43] ->
/usr/lib64/dovecot/libdovecot-storage.so.0(mailbox_transaction_commit_get_changes+0x54)
      [0x7f0ee3f91db4] ->
/usr/lib64/dovecot/libdovecot-storage.so.0(mailbox_transaction_commit+0x16)
      [0x7f0ee3f91e76] -> dovecot/indexer-worker [<a
        class="moz-txt-link-abbreviated" href="mailto:info@domain.com"
        moz-do-not-send="true">info@domain.com</a> INBOX](+0x291c)
      [0x557584acb91c] -> dovecot/indexer-worker [<a
        class="moz-txt-link-abbreviated" href="mailto:info@domain.com"
        moz-do-not-send="true">info@domain.com</a> INBOX](+0x2e54)
      [0x557584acbe54] ->
      /usr/lib64/dovecot/libdovecot.so.0(io_loop_call_io+0x55)
      [0x7f0ee3ca4eb5] ->
      /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0xdc)
      [0x7f0ee3ca6ebc] ->
      /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0x5c)
      [0x7f0ee3ca4fac] ->
      /usr/lib64/dovecot/libdovecot.so.0(io_loop_run+0x38)
      [0x7f0ee3ca51f8]<br>
      Aug 18 11:02:35 Error: indexer: Indexer worker disconnected,
      discarding 1 requests for <a class="moz-txt-link-abbreviated"
        href="mailto:info@domain.com" moz-do-not-send="true">info@domain.com</a><br>
      Aug 18 11:02:35 Error: imap(<a class="moz-txt-link-abbreviated"
        href="mailto:info@domain.com" moz-do-not-send="true">info@domain.com</a>)
      session=<g71KISOttvS5LNVj>: indexer failed to index mailbox
      INBOX<br>
      Aug 18 11:02:35 Fatal: indexer-worker(<a
        class="moz-txt-link-abbreviated" href="mailto:info@domain.com"
        moz-do-not-send="true">info@domain.com</a>)
      session=<g71KISOttvS5LNVj:O3ahCyuZO18cYAAAEPCW+w>: master:
      service(indexer-worker): child 24604 killed with signal 6 (core
      dumps disabled - <a class="moz-txt-link-freetext"
        href="https://dovecot.org/bugreport.html#coredumps"
        moz-do-not-send="true">https://dovecot.org/bugreport.html#coredumps</a>)</p>
    <p>I'm using FTS with Solr 6.6.5. What is it?<br>
    </p>
    <p>Thanks<br>
    </p>
    <pre class="moz-signature" cols="72">-- 
Alessio Cecchi
Postmaster @ <a class="moz-txt-link-freetext" href="http://www.qboxmail.it" moz-do-not-send="true">http://www.qboxmail.it</a>
<a class="moz-txt-link-freetext" href="https://www.linkedin.com/in/alessice" moz-do-not-send="true">https://www.linkedin.com/in/alessice</a></pre>
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