IN DICT0STATS.CC 3049

Problem:

When the information schema table information_schema.innodb_cmp_per_index
is queried, an in-memory heap table is dynamically created and required
data is populated.  The data is collected from the dictionary and populated
in the heap table.  When the heap table becomes larger then it is converted to
an on-disk InnoDB intrinsic temporary table.

When the information is collected from data dictionary and populated in the
in-memory heap table the dict_sys->mutex is taken.  This mutex will be released
when the heap table is completely populated.  When the transition happens from
in-memory heap table to on-disk InnoDB intrinsic temporary table, the
dict_sys->mutex is being held.  So when the InnoDB intrinsic temporary table
is created the dict_sys->mutex is being held.  This causes the assert.

Solution:

Before creating the InnoDB intrinsic temporary table release the
dict_sys->mutex.  Reacquire the dict_sys->mutex after creating the InnoDB
intrinsic temporary table.

rb#11106 approved by Bin Su and Marc Alff.