As usual I concentrate mostly on InnoDB, replication and optimizer bugs. Here is the list, starting from the oldest:
- Bug #96374 - "binlog rotation deadlock when innodb concurrency limit setted". This bug was reported by Jia Liu, who used gdb to show threads deadlock details. I admit that recently more bug reporters use gdb and sysbench with custom(ized) Lua scripts to prove the point, and I am happy to see this happening!
- Bug #96378 - "Subquery with parameter is exponentially slower than hard-coded value". In my primitive test with user variables replaced by constants (on MariaDB 10.3.7) I get the same plan for the query, so I am not 100% sure that the analysis by my dear friend Sinisa Milivojevic was right and it's about optimization (and not comparing values with different collations, for example). But anyway, this problem reported by Jeff Johnson ended up as a verified feature request. Let's see what may happen to it next.
- Bug #96379 - "First query successful, second - ERROR 1270 (HY000): Illegal mix of collations ". This really funny bug was reported by Владислав Сокол.
- Bug #96400 - "MTS STOP SLAVE takes over a minute when master crashed during event logging". Nice bug report by Przemyslaw Malkowski from Percona, who used sysbench and dbdeployer to demonstrate the problem. Later Przemysław Skibiński (also from Percona) provided a patch to resolve the problem.
- Bug #96412 - "Mess usages of latch meta data for InnoDB latches (mutex and rw_lock)". Fungo Wang had to make a detailed code analysis to get this bug verified. I am not sure why it ended up with severity S6 (Debug Builds) though.
- Bug #96414 - "CREATE TABLE events in wrong order in a binary log.". This bug was reported by Iwo P. His test case to demonstarte the problem included small source code modification, but (unlike with some other bug reports) this had NOT prevented accepting it as a true, verified bug. The bug not affect MySQL 8.0.3+ thanks to WL#6049 "Meta-data locking for FOREIGN KEY tables" implemented there.
- Bug #96472 - "Memory leak after 'innodb.alter_crash'". Yet another bug affecting only MySQL 4.7 and not MySQL 8.0. It was reported by Yura Sorokin from Percona.
- Bug #96475 - "ALTER TABLE t IMPORT TABLESPACE blocks SELECT on I_S.tables.". Clear and simple "How to repeat" instructions (using dbdeployer) by Jean-François Gagné. See also his related Bug #96477 - "FLUSH TABLE t FOR EXPORT or ALTER TABLE t2 IMPORT TABLESPACE broken in 8.0.17" for MySQL 8. The latter is a regression bug (without a regression tag), and I just do not get how the GA releases with such new bugs introduced may happen.
- Bug #96504 - "Refine atomics and barriers for weak memory order platform". Detailed analysis, with links to code etc from Cai Yibo.
- Bug #96525 - "Huge malloc when open file limit is high". Looks more like a systemd problem (in versions < 240) to me. Anyway, useful report from Andreas Hasenack.
- Bug #96615 - "mysql server cannot handle write operations after set system time to the past". A lot of arguments were needed to get this verified, but Shangshang Yu was not going to give up. First time I see gstack used in the bug report to get a stack trace quickly. It's a part of gdb RPM on CentOS 6+. I have to try it vs gdb and pstack one day and decide what is the easiest and most efficient way to get backtraces of all threads in production...
- Bug #96637 - "Clone fails on just upgraded server from 5.7". I had not used MySQL 8 famous clone plugin yet in practice, but I already know that it has bugs. This bug was reported by Satya Bodapati, who also suggested a patch.
- Bug #96644 - "Set read_only on a master waiting for semi-sync ACK blocked on global read lock". Yet another problem (documented limitation) report from Przemyslaw Malkowski. Not sure why it was not verified on MySQL 8.0. Without a workaround to set master to read only it is unsafe to use long rpl_semi_sync_master_timeout values, as we may end up with that long downtime.
- Bug #96677 - ""SELECT ... INTO var_name FOR UPDATE" not working in MySQL 8". This regression bug was reported by Vinodh Krish. Some analysis and patch were later suggested by Zsolt Parragi.
- Bug #96690 - "sql_require_primary_key should not apply to temporary tables". This bug was also reported by Przemyslaw Malkowski from Percona. It ended up as a verified feature request, but not everyone in community is happy with this. Let me quote:
"[30 Aug 8:08] Jean-François Gagné
Could we know what was the original severity of this bug as reported by Przemyslaw ? This is now hidden as it has been reclassified as S4 (Feature Request).
From my point of view, this is actually a bug, not a feature request and it should be classified as S2. A perfectly working application would break for no reason when a temporary table does not have a Primary Key, so this is actually a big hurdle for using sql_require_primary_key, hence serious bug in the implementation of this otherwise very nice and useful feature."
|Winter is coming, so why not to remember nice warm sunny days and interesting MySQL bugs reported back then.|
- We still see some strange "games" played during bugs processing and trend to decrease severity of reports. I think this is a waste of time for both Oracle engineers and community bug reporters.
- I am still not sure if Oracle's QA does not use ASan or just ignore problems reported for MTR test cases. Anyway, Percona engineers do this for them, and report related bugs :)
- dbdeployer and sysbench are really popular among MySQL bug reporters recently!
- Importing of InnoDB tablespaces is broken in MySQL 8.0.17+ at least.
- There are many interesting MySQL bugs reported during last 3 months, so I epxect more posts in this series soon.