Description:
# valgrind --track-origins=yes --trace-children=yes /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --log-error=/var/log/mysqld.log --open-files-limit=2048 --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock --port=3306
==10645== Memcheck, a memory error detector
==10645== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==10645== Using Valgrind-3.6.0 and LibVEX; rerun with -h for copyright info
==10645== Command: /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --log-error=/var/log/mysqld.log --open-files-limit=2048 --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock --port=3306
==10645==
==10645== Conditional jump or move depends on uninitialised value(s)
==10645== at 0x81CE2D: chk_del (in /usr/libexec/mysqld)
==10645== by 0x7F9DAD: ha_myisam::check(THD*, st_ha_check_opt*) (in /usr/libexec/mysqld)
==10645== by 0x7F9749: ha_myisam::check_and_repair(THD*) (in /usr/libexec/mysqld)
==10645== by 0x6013C5: ??? (in /usr/libexec/mysqld)
==10645== by 0x605078: open_table(THD*, TABLE_LIST*, st_mem_root*, bool*, unsigned int) (in /usr/libexec/mysqld)
==10645== by 0x605C2F: open_tables(THD*, TABLE_LIST**, unsigned int*, unsigned int) (in /usr/libexec/mysqld)
==10645== by 0x605E39: open_and_lock_tables_derived(THD*, TABLE_LIST*, bool) (in /usr/libexec/mysqld)
==10645== by 0x65F761: acl_reload(THD*) (in /usr/libexec/mysqld)
==10645== by 0x660AA2: acl_init(bool) (in /usr/libexec/mysqld)
==10645== by 0x5BE02E: main (in /usr/libexec/mysqld)
==10645== Uninitialised value was created by a stack allocation
==10645== at 0x81CCA7: chk_del (in /usr/libexec/mysqld)
How to repeat:
# valgrind --track-origins=yes --trace-children=yes /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --log-error=/var/log/mysqld.log --open-files-limit=2048 --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock --port=3306
Suggested fix:
Not sure why there is an UNINIT_VAR() macro wrapping the old_link, but valgrind complains.
{{{
int chk_del(MI_CHECK *param, register MI_INFO *info, uint test_flag)
{
reg2 ha_rows i;
uint delete_link_length;
my_off_t empty,next_link,UNINIT_VAR(old_link);
}}}
Description: # valgrind --track-origins=yes --trace-children=yes /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --log-error=/var/log/mysqld.log --open-files-limit=2048 --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock --port=3306 ==10645== Memcheck, a memory error detector ==10645== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al. ==10645== Using Valgrind-3.6.0 and LibVEX; rerun with -h for copyright info ==10645== Command: /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --log-error=/var/log/mysqld.log --open-files-limit=2048 --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock --port=3306 ==10645== ==10645== Conditional jump or move depends on uninitialised value(s) ==10645== at 0x81CE2D: chk_del (in /usr/libexec/mysqld) ==10645== by 0x7F9DAD: ha_myisam::check(THD*, st_ha_check_opt*) (in /usr/libexec/mysqld) ==10645== by 0x7F9749: ha_myisam::check_and_repair(THD*) (in /usr/libexec/mysqld) ==10645== by 0x6013C5: ??? (in /usr/libexec/mysqld) ==10645== by 0x605078: open_table(THD*, TABLE_LIST*, st_mem_root*, bool*, unsigned int) (in /usr/libexec/mysqld) ==10645== by 0x605C2F: open_tables(THD*, TABLE_LIST**, unsigned int*, unsigned int) (in /usr/libexec/mysqld) ==10645== by 0x605E39: open_and_lock_tables_derived(THD*, TABLE_LIST*, bool) (in /usr/libexec/mysqld) ==10645== by 0x65F761: acl_reload(THD*) (in /usr/libexec/mysqld) ==10645== by 0x660AA2: acl_init(bool) (in /usr/libexec/mysqld) ==10645== by 0x5BE02E: main (in /usr/libexec/mysqld) ==10645== Uninitialised value was created by a stack allocation ==10645== at 0x81CCA7: chk_del (in /usr/libexec/mysqld) How to repeat: # valgrind --track-origins=yes --trace-children=yes /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --log-error=/var/log/mysqld.log --open-files-limit=2048 --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock --port=3306 Suggested fix: Not sure why there is an UNINIT_VAR() macro wrapping the old_link, but valgrind complains. {{{ int chk_del(MI_CHECK *param, register MI_INFO *info, uint test_flag) { reg2 ha_rows i; uint delete_link_length; my_off_t empty,next_link,UNINIT_VAR(old_link); }}}