Hi guys, i was trying the mariadb with lower value of thread_pool_max_threads to 3 and after my fourth connection i got a error and server crashed, it's a new server, i downloaded the 32bits version of mariadb, unziped and run this command line: C:\Program Files\mariadb-10.0.4-win32\bin>mysqld --datadir=..\data\ --log_error=..\log --port=3306 --thread_pool_max_threads=3 the error output at log was: 130915 21:43:37 [ERROR] mysqld got exception 0x80000003 ; This could be because you hit a bug. It is also possible that this binary or one of the libraries it was linked against is corrupt, improperly built, or misconfigured. This error can also be caused by malfunctioning hardware. To report this bug, see http://kb.askmonty.org/en/reporting-bugs We will try our best to scrape up some info that will hopefully help diagnose the problem, but since we have already crashed, something is definitely wrong and this may fail. Server version: 10.0.4-MariaDB key_buffer_size=134217728 read_buffer_size=131072 max_used_connections=0 max_threads=4 thread_count=0 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 141750 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x0x0 Attempting backtrace. You can use the following information to find out where mysqld died. If you see no messages after this, something went terribly wrong... mysqld.exe!os_aio_windows_handle()[os0file.cc:4786] mysqld.exe!fil_aio_wait()[fil0fil.cc:5396] mysqld.exe!io_handler_thread()[srv0start.cc:477] kernel32.dll!BaseThreadInitThunk() ntdll.dll!RtlInitializeExceptionChain() ntdll.dll!RtlInitializeExceptionChain() The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains information that should help you find out what is causing the crash. any help is wellcome, maybe the max_threads is bigger than thread_pool_max_threads? that's could be the problem? i didn't checked the source yet -- Roberto Spadim SPAEmpresarial