Commit 7a8c93e6 authored by Aditya A's avatar Aditya A

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. 
parent 078d7a87
......@@ -1340,7 +1340,6 @@ void clean_up(bool print_message)
lex_free(); /* Free some memory */
item_create_cleanup();
set_var_free();
free_charsets();
if (!opt_noacl)
{
#ifdef HAVE_DLOPEN
......@@ -1390,6 +1389,7 @@ void clean_up(bool print_message)
#ifdef USE_REGEX
my_regex_end();
#endif
free_charsets();
#if defined(ENABLED_DEBUG_SYNC)
/* End the debug sync facility. See debug_sync.cc. */
debug_sync_end();
......
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