MySQL crashing with signal 11, please help....

I can`t find why my MySQL crashing every day few times with signal 11 error, I hope so that somebody of you know how I can fix this...
This is on Dual Opteron server with Centos 4.2 64 bit...

This is error:
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=19922944
read_buffer_size=2093056
max_used_connections=7
max_connections=1300
threads_connected=6
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_connections = 533904
5 K
bytes of memory
Hope that's ok; if not, decrease some variables in the equation.


Number of processes running now: 1
060223 23:50:28 mysqld restarted
/usr/sbin/mysqld: ready for connections.
Version: '4.0.25-standard' socket: '/var/lib/mysql/mysql.sock' port: 3306 Off
icial MySQL RPM


my.cnf (but I must tell that this MySQL also crashing with default my.cnf with only 3 lines):

[mysqld]
safe-show-database
skip-innodb
max_connections = 1300
key_buffer = 19M
myisam_sort_buffer_size = 64M
join_buffer_size = 1M
read_buffer_size = 2M
sort_buffer_size = 2M
table_cache = 1024
thread_cache_size = 64
wait_timeout = 30
connect_timeout = 10
tmp_table_size = 32M
max_allowed_packet = 16M
max_connect_errors = 10000
query_cache_limit = 1M
query_cache_size = 32M
query_cache_type = 1
query_prealloc_size = 16384
query_alloc_block_size = 16384

[mysqld_safe]
open_files_limit = 8192

[mysqldump]
quick
max_allowed_packet = 16M

[myisamchk]
key_buffer = 64M
sort_buffer = 64M
read_buffer = 16M
write_buffer = 16M

STATUS:
+--------------------------+------------+
| Variable_name | Value |
+--------------------------+------------+
| Aborted_clients | 860 |
| Aborted_connects | 0 |
| Bytes_received | 251366911 |
| Bytes_sent | 1990495877 |
| Com_admin_commands | 0 |
| Com_alter_table | 0 |
| Com_analyze | 0 |
| Com_backup_table | 0 |
| Com_begin | 0 |
| Com_change_db | 883260 |
| Com_change_master | 0 |
| Com_check | 0 |
| Com_commit | 0 |
| Com_create_db | 0 |
| Com_create_function | 0 |
| Com_create_index | 0 |
| Com_create_table | 0 |
| Com_delete | 37644 |
| Com_delete_multi | 0 |
| Com_drop_db | 0 |
| Com_drop_function | 0 |
| Com_drop_index | 0 |
| Com_drop_table | 0 |
| Com_flush | 10 |
| Com_grant | 0 |
| Com_ha_close | 0 |
| Com_ha_open | 0 |
| Com_ha_read | 0 |
| Com_insert | 44678 |
| Com_insert_select | 0 |
| Com_kill | 0 |
| Com_load | 0 |
| Com_load_master_data | 0 |
| Com_load_master_table | 0 |
| Com_lock_tables | 715 |
| Com_optimize | 0 |
| Com_purge | 0 |
| Com_rename_table | 0 |
| Com_repair | 0 |
| Com_replace | 0 |
| Com_replace_select | 0 |
| Com_reset | 0 |
| Com_restore_table | 0 |
| Com_revoke | 0 |
| Com_rollback | 0 |
| Com_savepoint | 0 |
| Com_select | 678875 |
| Com_set_option | 540 |
| Com_show_binlog_events | 0 |
| Com_show_binlogs | 1 |
| Com_show_create | 125 |
| Com_show_databases | 5 |
| Com_show_fields | 130 |
| Com_show_grants | 17 |
| Com_show_keys | 0 |
| Com_show_logs | 0 |
| Com_show_master_status | 0 |
| Com_show_new_master | 0 |
| Com_show_open_tables | 0 |
| Com_show_processlist | 150 |
| Com_show_slave_hosts | 0 |
| Com_show_slave_status | 0 |
| Com_show_status | 1 |
| Com_show_innodb_status | 0 |
| Com_show_tables | 137 |
| Com_show_variables | 5 |
| Com_slave_start | 0 |
| Com_slave_stop | 0 |
| Com_truncate | 0 |
| Com_unlock_tables | 715 |
| Com_update | 321714 |
| Com_update_multi | 10 |
| Connections | 172564 |
| Created_tmp_disk_tables | 16421 |
| Created_tmp_tables | 27824 |
| Created_tmp_files | 0 |
| Delayed_insert_threads | 0 |
| Delayed_writes | 0 |
| Delayed_errors | 0 |
| Flush_commands | 1 |
| Handler_commit | 0 |
| Handler_delete | 49015 |
| Handler_read_first | 119496 |
| Handler_read_key | 5317588 |
| Handler_read_next | 293391361 |
| Handler_read_prev | 99410 |
| Handler_read_rnd | 106652588 |
| Handler_read_rnd_next | 236453381 |
| Handler_rollback | 0 |
| Handler_update | 1088668 |
| Handler_write | 898223 |
| Key_blocks_used | 17808 |
| Key_read_requests | 34633104 |
| Key_reads | 19941 |
| Key_write_requests | 1574977 |
| Key_writes | 440179 |
| Max_used_connections | 15 |
| Not_flushed_key_blocks | 0 |
| Not_flushed_delayed_rows | 0 |
| Open_tables | 171 |
| Open_files | 301 |
| Open_streams | 0 |
| Opened_tables | 227 |
| Questions | 2938936 |
| Qcache_queries_in_cache | 5781 |
| Qcache_inserts | 650719 |
| Qcache_hits | 798052 |
| Qcache_lowmem_prunes | 7081 |
| Qcache_not_cached | 28156 |
| Qcache_free_memory | 22677256 |
| Qcache_free_blocks | 3399 |
| Qcache_total_blocks | 15227 |
| Rpl_status | NULL |
| Select_full_join | 11121 |
| Select_full_range_join | 41 |
| Select_range | 135524 |
| Select_range_check | 0 |
| Select_scan | 30531 |
| Slave_open_temp_tables | 0 |
| Slave_running | OFF |
| Slow_launch_threads | 0 |
| Slow_queries | 1 |
| Sort_merge_passes | 0 |
| Sort_range | 18455 |
| Sort_rows | 106655932 |
| Sort_scan | 31414 |
| Table_locks_immediate | 1141234 |
| Table_locks_waited | 2593 |
| Threads_cached | 13 |
| Threads_created | 16 |
| Threads_connected | 3 |
| Threads_running | 1 |
| Uptime | 45158 |
+--------------------------+------------+
133 rows in set (0.00 sec)


On this server I have only two DB`s with ~30 MB DATA....

I hope so that somebody can help me, is this problem with 64 bit or...

Thanks.