The PoC is generated by my DBMS fuzzer. It can also be reproduced in the beta docker image.
```SQL
CREATE TABLE v0 ( v1 INT ) ;
 SELECT '{a: 1, b: [2, 3] }' AS negative_value FROM v0 GROUP BY rollup ( v1 , v1 ) ;
```

backtrace:
```c
#0 0x7acda2 (qi_inst_state_free+0x52)
#1 0x7ae062 (qi_free+0x372)
#2 0x7adc91 (qi_kill+0x2c1)
#3 0x7c0f96 (qr_exec+0x1926)
#4 0x7ce1d6 (sf_sql_execute+0x11a6)
#5 0x7cecde (sf_sql_execute_w+0x17e)
#6 0x7d799d (sf_sql_execute_wrapper+0x3d)
#7 0xe214bc (future_wrapper+0x3fc)
#8 0xe28dbe (_thread_boot+0x11e)
#9 0x7fbe77c96609 (start_thread+0xd9)
#10 0x7fbe77a66133 (clone+0x43)
```

ways to reproduce (write poc to the file /tmp/test.sql first):
```bash
# remove the old one
docker container rm virtdb_test -f
# start virtuoso through docker
docker run --name virtdb_test -itd --env DBA_PASSWORD=dba  pkleef/virtuoso-opensource-7
# wait the server starting
sleep 10
# check whether the simple query works
echo "SELECT 1;" | docker exec -i virtdb_test isql 1111 dba
# run the poc
cat /tmp/test.sql | docker exec -i virtdb_test isql 1111 dba
```
Fuzzer: Virtuoso 7.2.11 crashed at `qi_inst_state_free`
This is a GitHub Issue
repo:virtuoso-opensource
owner:openlink
Title : Fuzzer: Virtuoso 7.2.11 crashed at `qi_inst_state_free`
Issue date:

--- start body ---
The PoC is generated by my DBMS fuzzer. It can also be reproduced in the beta docker image.
```SQL
CREATE TABLE v0 ( v1 INT ) ;
 SELECT '{a: 1, b: [2, 3] }' AS negative_value FROM v0 GROUP BY rollup ( v1 , v1 ) ;
```

backtrace:
```c
#0 0x7acda2 (qi_inst_state_free+0x52)
#1 0x7ae062 (qi_free+0x372)
#2 0x7adc91 (qi_kill+0x2c1)
#3 0x7c0f96 (qr_exec+0x1926)
#4 0x7ce1d6 (sf_sql_execute+0x11a6)
#5 0x7cecde (sf_sql_execute_w+0x17e)
#6 0x7d799d (sf_sql_execute_wrapper+0x3d)
#7 0xe214bc (future_wrapper+0x3fc)
#8 0xe28dbe (_thread_boot+0x11e)
#9 0x7fbe77c96609 (start_thread+0xd9)
#10 0x7fbe77a66133 (clone+0x43)
```

ways to reproduce (write poc to the file /tmp/test.sql first):
```bash
# remove the old one
docker container rm virtdb_test -f
# start virtuoso through docker
docker run --name virtdb_test -itd --env DBA_PASSWORD=dba  pkleef/virtuoso-opensource-7
# wait the server starting
sleep 10
# check whether the simple query works
echo "SELECT 1;" | docker exec -i virtdb_test isql 1111 dba
# run the poc
cat /tmp/test.sql | docker exec -i virtdb_test isql 1111 dba
```
--- end body ---
