Bug#14234028 - CRASH DURING SHUTDOWN WITH BACKGROUND PURGE THREAD
Analysis --------- my_stat() calls stat() and if the stat() call fails we try to set the variable my_errno which is actually a thread specific data . We try to get the address of this thread specific data using my_pthread_getspecifc(),but for the purge thread we have not defined any thread specific data so it returns null and when dereferencing null we get a segmentation fault. init_available_charsets() seen in the core stack is invoked through pthread_once() .pthread_once is used for one time initialization.Since free_charsets() is called before innodb plugin shutdown ,purge thread calls init_avaliable_charsets() which leads to the crash. Fix --- Call free_charsets() after the innodb plugin shutdown,since purge threads are still using the charsets.
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