[MDEV-18684] mysql_thread_end memory leak in compat libmysqlclient.so.18 - Jira

Details

Type: Bug
Status: Open (View Workflow)
Priority: Major
Resolution: Unresolved
Affects Version/s: 5.5(EOL), 10.0(EOL), 10.1(EOL)
Fix Version/s: 5.5(EOL), 10.1(EOL)
Component/s: Scripts & Clients
Labels:
None

Description

https://bugs.mysql.com/bug.php?id=66740 describes a memory leak in older versions of libmysqlclient (from MySQL). I have an app suffering from this leak on CentOS 7 with the mariadb-libs 5.5.60 package it ships. I noticed that the -compat packages from downloads.mariadb.org offer a dropin libmysqlclient.so.18, but to my surprise, those also have the leak!

libmariadb.so.3 from MariaDB-shared does not leak (when compiled against, it's not a drop in replacement apparently).

Would it be possible to backport the fix for that leak from libmariadb to compat/libmysqlclient?

Attachments

Issue Links

links to

Bug #66740 Fix the mysql_thread_end cleanup bug in libmysql

Activity

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Peter van Dijk created issue - 2019-02-21 15:55

Michal Schorm added a comment - 2019-05-03 22:51

There's another confirmed user affected, on RHEL7.

Example of memory leak :

==179== 2,080 bytes in 10 blocks are definitely lost in loss record 300 of 320

==179==    at 0x4C2B955: calloc (vg_replace_malloc.c:711)

==179==    by 0x9C50A36: ??? (in /usr/lib64/mysql/libmysqlclient.so.18.0.0)

==179==    by 0x9C15BC4: mysql_server_init (in /usr/lib64/mysql/libmysqlclient.so.18.0.0)

==179==    by 0x9C1CE96: mysql_init (in /usr/lib64/mysql/libmysqlclient.so.18.0.0)

==179==    by 0x99EAC9D: SMySQL::connect() (in /usr/lib64/pdns/libgmysqlbackend.so)

Michal Schorm added a comment - 2019-05-03 22:51 There's another confirmed user affected, on RHEL7. Example of memory leak : ==179== 2,080 bytes in 10 blocks are definitely lost in loss record 300 of 320 ==179== at 0x4C2B955: calloc (vg_replace_malloc.c:711) ==179== by 0x9C50A36: ??? ( in /usr/lib64/mysql/libmysqlclient .so.18.0.0) ==179== by 0x9C15BC4: mysql_server_init ( in /usr/lib64/mysql/libmysqlclient .so.18.0.0) ==179== by 0x9C1CE96: mysql_init ( in /usr/lib64/mysql/libmysqlclient .so.18.0.0) ==179== by 0x99EAC9D: SMySQL::connect() ( in /usr/lib64/pdns/libgmysqlbackend .so)