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BUG#14485479: INSTALL AUDIT PLUGIN HANGS IF WE TRY TO

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DISABLE AND ENABLED DURING DDL OPERATION

PROBLEM: Same thread trying to acquire the same mutex
         second time leads to hang/server crash.
         While [un]installing audit_log plugin
         a thread acquires the LOCK_plugin mutex
         and after successful initialization tries
         to write in mysql.plugin table. It holds
         this mutex for a long time. If some how
         plugin table is corrupted then a write to 
         plugin table will throw an error, thread try
         to log this error in the audit_log plugin,
         doing so it tries to acquire the mutex
         again and results is server hang/crash.

SOLUTION: Releasing the LOCK_plugin mutex before
          writing in mysql.plugin table. We dont
          need to hold this mutex as thread already
          acquired a TL_WRITE lock on mysql.plugin
          table.
This commit is contained in:
Ashish Agarwal
2012-10-31 12:40:48 +05:30
parent fa3e181d62
commit 147be51f20
3 changed files with 26 additions and 2 deletions
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1
mysql-test/include/plugin.defs
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@ -40,3 +40,4 @@ ha_blackhole storage/blackhole BLACKHOLE_PLUGIN
ha_federated storage/federated FEDERATED_PLUGIN
mypluglib plugin/fulltext SIMPLE_PARSER
libdaemon_example plugin/daemon_example DAEMONEXAMPLE
adt_null plugin/audit_null AUDIT_NULL