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MYSQLD. DESCRIPTION =========== Crash occurs when daemon_example plugin is uninstalled immediately after its installed. This can be reproduced by installing and uninstalling the plugin repeatedly. ANALYSIS ======== The daemon_example_plugin_deinit() function of the daemon example plugin calls pthread_cancel() but doesn't wait for the worker thread to actually complete before deallocating the data buffer and closing the file that it writes to. This is causing SEGFAULT! FIX === Added a pthread_join() to wait for the thread to complete before doing the cleanup work. Removed a stray 'x' variable from the example code. NOTE ==== Have made an entry in .opt file as given below: --plugin-dir=$DAEMONEXAMPLE_DIR This is done so that the program takes plugin directory as ../<dbg>/plugin/daemon_example/ instead of ../lib/plugin/