Comment 1 for bug 1102776

Testcase is easy:

$ cat start_mtr98
cd /ssd/Percona-Server-5.5.28-rel29.3-415.Linux.x86_64/mysql-test/
perl lib/v1/mysql-test-run.pl --start-and-exit --valgrind --mysqld=--relay-log=slave-relay-bin --mysqld=--abort-slave-event-count=10 --mysqld=--log-queries-not-using-indexes --mysqld=--secure-file-priv= --mysqld=--max-allowed-packet=16Mb --mysqld=--loose-innodb-status-file=1 --mysqld=--master-retry-count=65535 --mysqld=--loose-debug-assert-if-crashed-table --mysqld=--loose-debug-assert-on-error --mysqld=--skip-name-resolve --vardir=/ssd/775838/vardir1_98 --master_port=17001--mysqld="--log-output=none" --mysqld="--sql_mode=ONLY_FULL_GROUP_BY" --mysqld="--innodb-max-bitmap-file-size=4095" --mysqld="--innodb-changed-pages-limit=-1" 1st 2>&1
$ cat stop_mtr98
/ssd/Percona-Server-5.5.28-rel29.3-415.Linux.x86_64/bin/mysqladmin -uroot -S/ssd/775838/vardir1_98/tmp/master.sock shutdown
$ ./start_mtr98;./stop_mtr98
$ vi /ssd/775838/vardir1_98/log/master.err # And see Valgrind error

This seems to have something to do with the length of the startup command & option parsing. For example, though the server does not start with the following command, it/this also produces the same Valgrind warning :

$ cat start_mtr98.safe.2
cd /ssd/Percona-Server-5.5.28-rel29.3-415.Linux.x86_64/mysql-test/
perl lib/v1/mysql-test-run.pl --start-and-exit --valgrind --mysqld=--relay-log=slave-relay-bin --mysqld=--aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa --mysqld=--secure-file-priv= --mysqld=--max-allowed-packet=16Mb --mysqld=--loose-innodb-status-file=1 --mysqld=--master-retry-count=
65535 --mysqld=--loose-debug-assert-if-crashed-table --mysqld=--loose-debug-assert-on-error --mysqld=--skip-name-resolve --vardir=/ssd/775838/vardir1_98 --master_port=17001 --mysqld="--log-output=none" --mysqld="--sql_mode=ONLY_FULL_GROUP_BY" --mysqld="--innodb-max-bitmap-file-size=4095" --mysqld="--innodb-changed-pages-limit=-1" 1st 2>&1

However, when reducing the length of 'aaaaa..aaaaa' the Valgrind error disappears.