MySQL 4.0.20 usage 95-100% CPU :(

[Maxim V]

Hi All!

There was a problem,
MYSQL 4.0.20 approximately in day of work starts to load CPU on 95-100 %
Helps only:
#./mysql.sh stop
#./mysql.sh start

MySQL answers all inquiries, in process a sheet is not present what active processes which can so to load CPU.

What can it be?


OS: FreeBSD 4.10
MySQL 4.0.20 (src)
(CC=gcc CFLAGS="-O2 -fno-strength-reduce" \
CXX=gcc CXXFLAGS="-O2 -fno-rtti -fno-exceptions -felide-constructors \
-fno-strength-reduce" \
./configure --prefix=/usr/local/mysql --enable-assembler
)

Hardware:
CPU: Intel® XENON™ HTT 2.4 GHz х2
RAM: 1024MB
Chipset: Intel® E7501

my.cnt:
***
[mysqld]
port = 3306
socket = /tmp/mysql.sock
skip-locking
key_buffer = 384M
max_allowed_packet = 1M
table_cache = 512
sort_buffer_size = 2M
read_buffer_size = 2M
myisam_sort_buffer_size = 64M
thread_cache = 8
query_cache_size = 32M
max_connections = 1000
thread_concurrency = 8
skip-bdb
skip-innodb
***