Details
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Bug
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Status: Confirmed (View Workflow)
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Major
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Resolution: Unresolved
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10.5, 10.6, 10.8.3, 10.3(EOL), 10.4(EOL), 10.7(EOL), 10.8(EOL), 10.9(EOL)
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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
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
/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> START TRANSACTION;
conn_1> START TRANSACTION;
conn_1> insert into t_yynypc (wkey, pkey, c_acfajc) values
(89, 188000, 40),
(89, 189000, 5),
(89, 190000, 49),
(89, 191000, 39),
(89, 192000, 50),
(97, 227000, 86),
(97, 228000, 19),
(97, 229000, 3),
(97, 230000, 9);
conn_0> delete from t_qrsdpb where
exists (
select
ref_0.c_bkmkf as c2
from
t_zefkic as ref_0
where t_qrsdpb.c_hhsy0b not in (
select
ref_3.wkey as c0
from
(t_yynypc as ref_2
left outer join t_zefkic as ref_3
on (ref_2.wkey = ref_3.wkey ))
where ref_3.pkey >= ref_2.wkey)); --- this DELETE blocks
conn_1> update t_zefkic set wkey = 99; --- this UPDATE make the above DELETE crash the maridb server
conn_0> ROLLBACK;
conn_1> ROLLBACK;
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
- relates to
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MDEV-20666 Assertion failures prebuilt->sql_stat_start ... in row_search / index_read upon concurrent INSERT and CREATE .. SELECT
- Stalled