Details
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Bug
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Status: Closed (View Workflow)
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Critical
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Resolution: Duplicate
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10.8.3
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Ubuntu 20.04
Description
I used my fuzzing tool to test MariaDB and found a transaction-related bug that make the crashes.
Mariadb installation
1) cd mariadb-10.8.3
2) mkdir build; cd build
3) cmake .. -DCMAKE_BUILD_TYPE=Debug -DWITH_ASAN=ON
4) make -j12 && sudo make install
Setup the environment
1) export ASAN_OPTIONS=detect_leaks=0
2) /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql &
3) /usr/local/mysql/bin/mysql -uroot -Dtestdb < mysql_bk.sql (attached) # set up the database
Reproduce bug
Note: must in READ COMMITTED isolation level
/usr/local/mysql/bin/mysql -uroot -Dtestdb # set up connection conn_0
/usr/local/mysql/bin/mysql -uroot -Dtestdb # set up connection conn_1
conn_0> SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
conn_1> SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
conn_1> START TRANSACTION;
conn_0> START TRANSACTION;
conn_1> delete from t_swbayb;
conn_0> insert into t_swbayb (wkey, pkey) values (88, 74000);
conn_1> insert into t_8fjoxb (wkey, pkey, c_yecif) values
(110, 115000, case when exists (
select
ref_0.wkey as c14
from
t_swbayb as ref_0
where (ref_0.pkey > (
select distinct
ref_1.wkey as c0
from
t_swbayb as ref_1
))) then 'vxg_w' else null end
); --- This INSERT is blocked
conn_0> insert into t_swbayb (wkey, pkey, c_ywdp4d) values (90, 83000, 'vyenkd');
conn_0> COMMIT; --- this COMMIT make the above INSERT in conn_1 crash the MariaDB server
conn_1> COMMIT;
I have simplified the content of the test case, and I hope this report can help you reproduce and fix the bug. In addition, I attached the failure report (which has its stack trace).
Attachments
Issue Links
- is duplicated by
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MDEV-15656 Assertion `is_last_prefix <= 0' failed in QUICK_GROUP_MIN_MAX_SELECT::get_next
- Closed