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MDEV-28124 Server crashes in Explain_aggr_filesort::print_json_members

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SHOW EXPLAIN/ANALYZE FORMAT=JSON tries to access items that have already been
freed by a call to free_items() during THD::cleanup_after_query().
The solution is to disallow APC calls including SHOW EXPLAIN/ANALYZE
just before the call to free_items().
This commit is contained in:
Oleg Smirnov
2022-03-27 11:58:27 +07:00
committed by Sergei Petrunia
parent a0475cb9ca
commit 02c3babdec
22 changed files with 303 additions and 87 deletions
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20
mysql-test/main/show_explain_json.test
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@ -470,6 +470,26 @@ set names default;
drop table if exists t0,t1,t2;
--echo #
--echo # MDEV-28124: Server crashes in Explain_aggr_filesort::print_json_members
--echo # upon SHOW ANALYZE/EXPLAIN FORMAT=JSON
--echo #
let $wait_condition= select State='show_explain_trap' from information_schema.processlist where id=$thr2;
connection con1;
set @show_explain_probe_query= 'SELECT count(*) - count(*) FROM sys.waits_by_user_by_latency';
set debug_dbug='+d,log_slow_statement_end';
# Statement guarantees to produce 0 on every run
send SELECT count(*) - count(*) FROM sys.waits_by_user_by_latency;
connection default;
--source include/wait_condition.inc
--error ER_TARGET_NOT_EXPLAINABLE
evalp SHOW EXPLAIN FORMAT=JSON FOR $thr2;
connection con1;
reap;
--echo # End
connection default;
disconnect con1;