MySQL Bugs: #111406: MySQL Server encounters Assertion Failure when executing query

Bug #111406	MySQL Server encounters Assertion Failure when executing query
Submitted:	13 Jun 2023 19:08	Modified:	14 Jun 2023 5:21
Reporter:	Yu Liang	Email Updates:
Status:	Verified	Impact on me:	None
Category:	MySQL Server: DML	Severity:	S6 (Debug Builds)
Version:	8.0.33	OS:	Ubuntu (20.04 LTS)
Assigned to:		CPU Architecture:	x86 (Intel(R) Core(TM) i7-10700 CPU)

Description:
The latest version of the MySQL Server (version 8.0.33) (git commit hash: ea7087d8850) crashes with Assertion Failure when executing the following query:

Config from "/etc/mysql/conf.d/mysql.cnf":

```
[mysqld]
sql_mode = "NO_ENGINE_SUBSTITUTION"
```

```sql
drop database if exists test123;
create database test123;
use test123;
create table v0(c1 INT);
CREATE TABLE v2 ( PRIMARY KEY i3 ( c1 ) ) TABLE v0 ;
UPDATE ( v2 NATURAL LEFT JOIN v0 ) SET c1 = DEFAULT ORDER BY c1 ;
```

In the debug build, the server crashes with the following stack trace: 

```
mysql> UPDATE ( v2 NATURAL LEFT JOIN v0 ) SET c1 = DEFAULT ORDER BY c1 ;
mysqld: /home/mysql/mysql-server/sql/sql_update.cc:2083: bool safe_update_on_fly(const QEP_TAB *, const Table_ref *, Table_ref *): Assertion `false' failed.
2023-06-13T19:06:00Z UTC - mysqld got signal 6 ;
Most likely, you have hit a bug, but this error can also be caused by malfunctioning hardware.
BuildID[sha1]=1d55d4671b7469352fc317efb0121b604c26443d
Thread pointer: 0xffff08001040
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = ffffac69c538 thread_stack 0x100000
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(my_print_stacktrace(unsigned char const*, unsigned long)+0x60) [0x4e6bc30]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(print_fatal_signal(int)+0x340) [0x1a89320]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(handle_fatal_signal+0x16c) [0x1a896dc]
linux-vdso.so.1(__kernel_rt_sigreturn+0) [0xffffb15407a0]
/lib/aarch64-linux-gnu/libc.so.6(gsignal+0xe0) [0xffffb0bb4d78]
/lib/aarch64-linux-gnu/libc.so.6(abort+0x114) [0xffffb0ba1aac]
/lib/aarch64-linux-gnu/libc.so.6(+0x2d490) [0xffffb0bae490]
/lib/aarch64-linux-gnu/libc.so.6(+0x2d4f4) [0xffffb0bae4f4]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(GetImmediateUpdateTable(JOIN const*, bool)+0x9b8) [0x18d3a24]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(JOIN::attach_access_path_for_update_or_delete(AccessPath*)+0x384) [0x155e140]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(JOIN::create_access_paths()+0x64) [0x155e284]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(JOIN::optimize(bool)+0x6114) [0x15bbb48]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(Query_block::optimize(THD*, bool)+0x268) [0x173f4c4]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(Query_expression::optimize(THD*, TABLE*, bool, bool)+0x278) [0x18ae580]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(Sql_cmd_dml::execute_inner(THD*)+0x54) [0x1739d98]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(Sql_cmd_update::execute_inner(THD*)+0x168) [0x18c96c8]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(Sql_cmd_dml::execute(THD*)+0x7a0) [0x1737e1c]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(mysql_execute_command(THD*, bool)+0x3884) [0x162cd40]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(dispatch_sql_command(THD*, Parser_state*)+0x1124) [0x16252c0]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(dispatch_command(THD*, COM_DATA const*, enum_server_command)+0x5434) [0x161e224]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld(do_command(THD*)+0xb8c) [0x16228f4]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld() [0x1a59a64]
/home/mysql/mysql-server/bld/runtime_output_directory/mysqld() [0x655c1a0]
/lib/aarch64-linux-gnu/libpthread.so.0(+0x7624) [0xffffb14e6624]
/lib/aarch64-linux-gnu/libc.so.6(+0xd149c) [0xffffb0c5249c]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (ffff0822da90): UPDATE ( v2 NATURAL LEFT JOIN v0 ) SET c1 = DEFAULT ORDER BY c1
Connection ID (thread ID): 8
Status: NOT_KILLED
```

How to repeat:
Steps to repeat the Assertion Failure:
1. Download the MySQL Server source code from the official github repo: `https://github.com/mysql/mysql-server`
2. Checkout to the latest mysql released version: 8.0.33 (hash: `ea7087d8850`)
3. Compile MySQL using the command: 

```
mkdir -p bld
cd bld
cmake .. -DDOWNLOAD_BOOST=1 -DWITH_BOOST=../boost -DWITH_UNIT_TESTS=OFF -DUSE_LD_GOLD=1 -DWITH_DEBUG=1
make
```

4. Run the MySQL Server with command: 

```
./bin/mysqld --basedir=$(pwd) --datadir=$(pwd)/data_all/ori_data --port=7000  --socket=/tmp/mysql_0.sock --mysqlx=OFF --performance_schema=OFF
```

5. Setup the MySQL Server config in the path: "/etc/mysql/conf.d/mysql.cnf"

```
[mysqld]
sql_mode = "NO_ENGINE_SUBSTITUTION"
```

6. Run the MySQL Client with the PoC:

```
./bin/mysql --port=7000 --user=root --socket=/tmp/mysql_0.sock < poc_0.sql
```

where `poc_0.sql` is:

```sql
drop database if exists test123;
create database test123;
use test123;
create table v0(c1 INT);
CREATE TABLE v2 ( PRIMARY KEY i3 ( c1 ) ) TABLE v0 ;
UPDATE ( v2 NATURAL LEFT JOIN v0 ) SET c1 = DEFAULT ORDER BY c1 ;
```

Suggested fix:
The server should continue running instead of crashing by Assertion Failure.

Hello Yu Liang,

Thank you for the report and test case.
Observed that 8.0.33 only debug build is affected.

regards,
Umesh

-- release build
 ./mtr bug111406 --nocheck-testcases
Logging: ./mtr  bug111406 --nocheck-testcases
MySQL Version 8.0.33
Checking supported features
Using 'all' suites
Collecting tests
Checking leftover processes
Removing old var directory
 - WARNING: Using the 'mysql-test/var' symlink
Creating var directory '/export/home/tmp/ushastry/mysql-8.0.33/mysql-test/var'
Installing system database
Using parallel: 1

==============================================================================
                  TEST NAME                       RESULT  TIME (ms) COMMENT
------------------------------------------------------------------------------
drop database if exists test123;
Warnings:
Note    1008    Can't drop database 'test123'; database doesn't exist
create database test123;
use test123;
create table v0(c1 INT);
CREATE TABLE v2 ( PRIMARY KEY i3 ( c1 ) ) TABLE v0 ;
UPDATE ( v2 NATURAL LEFT JOIN v0 ) SET c1 = DEFAULT ORDER BY c1 ;
[ 50%] main.bug111406                            [ pass ]     10
[100%] shutdown_report                           [ pass ]

-- debug build - affected

./mtr bug111406 --nocheck-testcases  --debug-server
Logging: ./mtr  bug111406 --nocheck-testcases --debug-server
MySQL Version 8.0.33
Checking supported features
 - Binaries are debug compiled
Using 'all' suites
Collecting tests
Checking leftover processes
Removing old var directory
 - WARNING: Using the 'mysql-test/var' symlink
Creating var directory '/export/home/tmp/ushastry/mysql-8.0.33/mysql-test/var'
Installing system database
Using parallel: 1

==============================================================================
                  TEST NAME                       RESULT  TIME (ms) COMMENT
------------------------------------------------------------------------------
drop database if exists test123;
Warnings:
Note    1008    Can't drop database 'test123'; database doesn't exist
create database test123;
use test123;
create table v0(c1 INT);
CREATE TABLE v2 ( PRIMARY KEY i3 ( c1 ) ) TABLE v0 ;
UPDATE ( v2 NATURAL LEFT JOIN v0 ) SET c1 = DEFAULT ORDER BY c1 ;
[ 50%] main.bug111406                            [ fail ]
        Test ended at 2023-06-14 07:20:22

CURRENT_TEST: main.bug111406
mysqltest: At line 6: Query 'UPDATE ( v2 NATURAL LEFT JOIN v0 ) SET c1 = DEFAULT ORDER BY c1 ' failed.
ERROR 2013 (HY000): Lost connection to MySQL server during query

#0  0x00007f15707bdaa1 in pthread_kill () from /lib64/libpthread.so.0
#1  0x0000000003f9296e in my_write_core(int) ()
#2  0x00000000032365f5 in handle_fatal_signal ()
#3  <signal handler called>
#4  0x00007f156e9f7387 in raise () from /lib64/libc.so.6
#5  0x00007f156e9f8a78 in abort () from /lib64/libc.so.6
#6  0x00007f156e9f01a6 in __assert_fail_base () from /lib64/libc.so.6
#7  0x00007f156e9f0252 in __assert_fail () from /lib64/libc.so.6
#8  0x0000000003193a28 in safe_update_on_fly(QEP_TAB const*, Table_ref const*, Table_ref*) ()
#9  0x0000000003193ab7 in GetImmediateUpdateTable(JOIN const*, bool) ()
#10 0x00000000030735d7 in JOIN::attach_access_path_for_update_or_delete(AccessPath*) ()
#11 0x000000000307ec19 in JOIN::create_access_paths() ()
#12 0x00000000030b537e in JOIN::optimize(bool) ()
#13 0x000000000311a4b1 in Query_block::optimize(THD*, bool) ()
#14 0x000000000319107f in Query_expression::optimize(THD*, TABLE*, bool, bool) ()
#15 0x000000000311a0d5 in Sql_cmd_dml::execute_inner(THD*) ()
#16 0x000000000319b363 in Sql_cmd_update::execute_inner(THD*) ()
#17 0x0000000003123873 in Sql_cmd_dml::execute(THD*) ()
#18 0x00000000030c24af in mysql_execute_command(THD*, bool) ()
#19 0x00000000030c5dc9 in dispatch_sql_command(THD*, Parser_state*) ()
#20 0x00000000030c752b in dispatch_command(THD*, COM_DATA const*, enum_server_command) ()
#21 0x00000000030c926e in do_command(THD*) ()
#22 0x0000000003227bb7 in handle_connection ()
#23 0x0000000004743af9 in pfs_spawn_thread ()
#24 0x00007f15707b8ea5 in start_thread () from /lib64/libpthread.so.0
#25 0x00007f156eabfb2d in clone () from /lib64/libc.so.6