Форум пользователей MySQL

Решил поднять на сервере query_cache_size c 4096M до 6144M. Через некоторое время mysql перегружается с ошибкой
mysqld got signal 11
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. 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.

key_buffer_size=536870912
read_buffer_size=4190208
max_used_connections=41
max_connections=600
threads_connected=4

It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_connections = 7894683 K bytes of memory Hope that's ok; if not, decrease some variables in the equation.

Если опустить до 4096M, то все работает нормально. На серваке 24Gb оперативы, Quad Core.

Есть идеи в чем проблема?