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mariadb/extra
Vladislav Vaintroub 7cdf759c86 MDEV-14485 Server hangs on startup in THD::init
Solve 3 way deadlock between plugin_initialiaze(), THD::init() and
mysql_sys_var_char().

The deadlock exists because of the lock order inversion between
LOCK_global_system_variables mutex and LOCK_system_variables_hash
read-write lock-

In this case, it is enough to change LOCK_system_variables_hash to prefer
reads to fix the deadlock, i.e change it to mysql_prlock_t
2018-01-29 07:33:52 +00:00
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