The PoC is generated by my DBMS fuzzer. It can also be reproduced in the beta docker image.
```SQL
CREATE TABLE v0 ( v1 INT ) ;

 UPDATE v0 SET v1 = 16 WHERE v1 = v1 + ( SELECT v1 FROM v0 WHERE v1 / ( CASE WHEN v1 NOT IN ( 59 ) AND ( ( 0 , 255 ) , ( 21 , 127 ) ) THEN ( SELECT * FROM v0 WHERE v1 NOT IN ( SELECT v1 FROM v0 WHERE v1 IN ( ( ( 82694108.000000 , 9307368.000000 ) , ( 77644510.000000 , 10822800.000000 ) ) , 0 , 'x' , 4 ) ORDER BY v1 [ 84 ] , v1 [ 84 ] ) ) ELSE v1 + 87 END ) ) ;
```

backtrace:
```c
#0 0xc999a2 (sqlg_place_dpipes+0x2e2)
#1 0x749cc8 (sqlg_dt_query_1+0x17a8)
#2 0x74a9e7 (sqlg_top_1+0x107)
#3 0x7101c1 (sqlo_query_spec+0x1b1)
#4 0x7e0258 (sqlc_update_searched+0x548)
#5 0x6b9ac2 (sql_stmt_comp+0x812)
#6 0x6bc9d2 (sql_compile_1+0x1a62)
#7 0x7cba60 (stmt_set_query+0x340)
#8 0x7cd952 (sf_sql_execute+0x922)
#9 0x7cecde (sf_sql_execute_w+0x17e)
#10 0x7d799d (sf_sql_execute_wrapper+0x3d)
#11 0xe214bc (future_wrapper+0x3fc)
#12 0xe28dbe (_thread_boot+0x11e)
#13 0x7fa3f0d5d609 (start_thread+0xd9)
#14 0x7fa3f0b2d133 (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 `sqlg_place_dpipes`
This is a GitHub Issue
repo:virtuoso-opensource
owner:openlink
Title : Fuzzer: Virtuoso 7.2.11 crashed at `sqlg_place_dpipes`
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 ) ;

 UPDATE v0 SET v1 = 16 WHERE v1 = v1 + ( SELECT v1 FROM v0 WHERE v1 / ( CASE WHEN v1 NOT IN ( 59 ) AND ( ( 0 , 255 ) , ( 21 , 127 ) ) THEN ( SELECT * FROM v0 WHERE v1 NOT IN ( SELECT v1 FROM v0 WHERE v1 IN ( ( ( 82694108.000000 , 9307368.000000 ) , ( 77644510.000000 , 10822800.000000 ) ) , 0 , 'x' , 4 ) ORDER BY v1 [ 84 ] , v1 [ 84 ] ) ) ELSE v1 + 87 END ) ) ;
```

backtrace:
```c
#0 0xc999a2 (sqlg_place_dpipes+0x2e2)
#1 0x749cc8 (sqlg_dt_query_1+0x17a8)
#2 0x74a9e7 (sqlg_top_1+0x107)
#3 0x7101c1 (sqlo_query_spec+0x1b1)
#4 0x7e0258 (sqlc_update_searched+0x548)
#5 0x6b9ac2 (sql_stmt_comp+0x812)
#6 0x6bc9d2 (sql_compile_1+0x1a62)
#7 0x7cba60 (stmt_set_query+0x340)
#8 0x7cd952 (sf_sql_execute+0x922)
#9 0x7cecde (sf_sql_execute_w+0x17e)
#10 0x7d799d (sf_sql_execute_wrapper+0x3d)
#11 0xe214bc (future_wrapper+0x3fc)
#12 0xe28dbe (_thread_boot+0x11e)
#13 0x7fa3f0d5d609 (start_thread+0xd9)
#14 0x7fa3f0b2d133 (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 ---
