Crash in qc_sqlite.

2020-07-16 17:09:21 error : (2011593) Lost connection to the master server 'server1', closing session. Lost connection to master server while connection was idle. Connection has been idle for 2996.6 seconds. Error caused by: #HY000: Lost connection to backend server: network error. Last close reason: <none>

2020-07-16 17:09:34 alert : (2142538) Fatal: MaxScale 2.3.19 received fatal signal 11. Attempting backtrace.

2020-07-16 17:09:34 alert : (2142538) Commit ID: 87328228f8605cebab84b11f909c5a4dc976be4e System name: Linux Release string: NAME="CentOS Linux"

2020-07-16 17:09:34 alert : (2142538) /usr/lib64/maxscale/libqc_sqlite.so(+0x18f51): query_classifier/qc_sqlite/qc_sqlite.cc:1410

2020-07-16 17:09:34 alert : (2142538) /usr/lib64/maxscale/libqc_sqlite.so(+0x15108): query_classifier/qc_sqlite/qc_sqlite.cc:2062

2020-07-16 17:09:34 alert : (2142538) /usr/lib64/maxscale/libqc_sqlite.so(+0x7571e): _build/sqlite-bld-3110100/sqlite3.c:132692

2020-07-16 17:09:34 alert : (2142538) /usr/lib64/maxscale/libqc_sqlite.so(+0x7ab69): _build/sqlite-bld-3110100/sqlite3.c:135772

2020-07-16 17:09:34 alert : (2142538) /usr/lib64/maxscale/libqc_sqlite.so(+0x7afd4): _build/sqlite-bld-3110100/sqlite3.c:110333

2020-07-16 17:09:34 alert : (2142538) /usr/lib64/maxscale/libqc_sqlite.so(+0x7b4ab): _build/sqlite-bld-3110100/sqlite3.c:110432

2020-07-16 17:09:34 alert : (2142538) /usr/lib64/maxscale/libqc_sqlite.so(+0x7b539): _build/sqlite-bld-3110100/sqlite3.c:110498

2020-07-16 17:09:34 alert : (2142538) /usr/lib64/maxscale/libqc_sqlite.so(+0xcfb4): query_classifier/qc_sqlite/qc_sqlite.cc:3596

2020-07-16 17:09:34 alert : (2142538) /usr/lib64/maxscale/libqc_sqlite.so(+0xe657): query_classifier/qc_sqlite/qc_sqlite.cc:3768

2020-07-16 17:09:34 alert : (2142538) /usr/lib64/maxscale/libmaxscale-common.so.1.0.0(qc_get_type_mask+0x4f): /usr/include/c++/4.8.2/bits/basic_string.h:293

2020-07-16 17:09:34 alert : (2142538) /usr/lib64/maxscale/libmaxscale-common.so.1.0.0(_ZN8maxscale15QueryClassifier17update_route_infoENS0_16current_target_tEP5gwbuf+0x21e): server/core/queryclassifier.cc:1041

2020-07-16 17:09:35 alert : (2142538) /usr/lib64/maxscale/libreadwritesplit.so(_ZN14RWSplitSession10routeQueryEP5gwbuf+0x218): server/modules/routing/readwritesplit/rwsplitsession.cc:167

2020-07-16 17:09:35 alert : (2142538) /usr/lib64/maxscale/libreadwritesplit.so(_ZN8maxscale6RouterI7RWSplit14RWSplitSessionE10routeQueryEP10mxs_routerP18mxs_router_sessionP5gwbuf+0x1e): include/maxscale/router.hh:181

2020-07-16 17:09:35 alert : (2142538) /usr/lib64/maxscale/libmaxscale-common.so.1.0.0(session_route_query+0x18): server/core/session.cc:999

2020-07-16 17:09:35 alert : (2142538) /usr/lib64/maxscale/libmariadbclient.so(+0x65ed): server/modules/protocol/MySQL/mariadbclient/mysql_client.cc:1858

2020-07-16 17:09:35 alert : (2142538) /usr/lib64/maxscale/libmaxscale-common.so.1.0.0(+0x7efc8): server/core/dcb.cc:3174

2020-07-16 17:09:35 alert : (2142538) /usr/lib64/maxscale/libmaxscale-common.so.1.0.0(+0x7f101): server/core/dcb.cc:3266

2020-07-16 17:09:35 alert : (2142538) /usr/lib64/maxscale/libmaxscale-common.so.1.0.0(_ZN7maxbase6Worker15poll_waiteventsEv+0x1b5): maxutils/maxbase/src/worker.cc:854

2020-07-16 17:09:35 alert : (2142538) /usr/lib64/maxscale/libmaxscale-common.so.1.0.0(_ZN7maxbase6Worker3runEPNS_9SemaphoreE+0x51): maxutils/maxbase/src/worker.cc:555

2020-07-16 17:09:35 alert : (2142538) /lib64/libstdc++.so.6(+0xb5070): ??:?

2020-07-16 17:09:35 alert : (2142538) /lib64/libpthread.so.0(+0x7ea5): pthread_create.c:?

2020-07-16 17:09:35 alert : (2142538) /lib64/libc.so.6(clone+0x6d): ??:?