Thanks all,
[b]1. Get the core dump, use gdb to print the stacktrace.[/b]
I have no idea how to do this,i will try later

[b]2. Print your Nginx version: ./nginx -V[/b]

[color=#9933FF]nginx version: nginx/0.8.40
TLS SNI support disabled
configure arguments: --user=nginx --group=nginx --prefix=/usr/local/nginx-0.8.40 --sbin-path=/usr/local/nginx-0.8.40/bin/nginx --conf-path=/usr/local/nginx-0.8.40/conf/nginx.conf --pid-path=/var/run/nginx.pid --with-pcre=../pcre-7.8 --with-http_stub_status_module --with-http_sub_module --with-http_ssl_module --add-module=../nginx_http_push_module-0.692/ --add-module=../agentzh-chunkin-nginx-module-0f492bf/[/color]

[b]3. Put your Nginx's config file.[/b]

[color=#9933FF]user nobody nobody;

worker_processes 10;

#error_log /var/logs/error.log;
#error_log /var/logs/error.log notice;
#error_log /var/logs/error.log info;
pid /var/run/nginx.pid;

#Specifies the value for maximum file descriptors that can be opened by this process.
worker_rlimit_nofile 51200;

events
{
use epoll;
#maxclient = worker_processes * worker_connections / cpu_number
worker_connections 51200;
}

http
{
include mime.types;
default_type application/octet-stream;

log_format main '$remote_addr - $remote_user [$time_local] $request '
'"$status" $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"'
'"$gzip_ratio"';

log_format download '$remote_addr - $remote_user [$time_local] '
'"$request" $status $bytes_sent '
'"$http_referer" "$http_user_agent" '
'"$http_range" "$sent_http_content_range"';

sendfile on;
tcp_nopush on;
tcp_nodelay on;
#send_lowat 12000;


keepalive_timeout 75 20;
request_pool_size 4k;
connection_pool_size 256;

client_header_timeout 3m;
client_body_timeout 3m;
send_timeout 3m;

client_header_buffer_size 1k;
large_client_header_buffers 4 2k;

output_buffers 4 32k;
postpone_output 1460;
client_max_body_size 10m;
client_body_buffer_size 256k;
client_body_temp_path /dev/shm/client_body_temp;
proxy_temp_path /usr/local/nginx/proxy_temp;
fastcgi_temp_path /usr/local/nginx/fastcgi_temp;

#gzip
gzip on;
gzip_http_version 1.1;
gzip_comp_level 2;
gzip_proxied any;
gzip_types text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript;
gzip_min_length 1100;
gzip_buffers 4 8k;

# The following includes are specified for virtual hosts
include vhosts/host1.conf;
}[/color]

###############################################################
[b]host1.conf:[/b]

[color=#9933FF]###host1 setting start,add by script###########
server {
listen 80;
server_name host1 www.dhaxx.com;
index index.html index.htm index.php;
root /data/wwwroot/host1/webroot;

#error_page 404 /404error/404.html;
#error_page 500 502 503 504 /404error/50x.html;
location = /favicon.ico {
log_not_found off;
}

location ~ .*\.php?$
{
include fastcgi_params;
fastcgi_pass 127.0.0.1:10080;
#fastcgi_pass unix:/usr/local/php/etc/php-cgi.socket;
fastcgi_index index.php;
fastcgi_connect_timeout 60;
fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
fastcgi_buffer_size 128k;
fastcgi_buffers 4 256k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 256k;
fastcgi_intercept_errors on;
fastcgi_param SCRIPT_FILENAME /data/wwwroot/host1/webroot$fastcgi_script_name;
}

location /intime {
push_channel_group pushmodule_chat;

location /intime/publish {
set $push_channel_id $arg_id; #static channel id
push_publisher;
push_message_timeout 5m;
push_message_buffer_length 0;
}
location /intime/subscribe {
#push_authorized_channels_only on;
set $push_channel_id $arg_id; #static channel id
push_subscriber;
send_timeout 3600; #so that nginx won't drop connections willy-nilly
}
}
location ~* ^/(?!intime) {
if (!-e $request_filename) {
rewrite ^/(.+)$ /index.php?kohana_uri=$1 last;
}
}
location ~ ^/upload/ {
root /data/upload/host1/upload;
expires 30d;
}

location ~* /upload/.*\.php$ {
deny all;
}

location ~ ^/cache/ {
root /data/upload/host1/upload;
}

location ~ ^/weblogs/ {
root /data/weblogs/host1;
allow 218.5.2.219;
allow 220.250.21.82;
allow 121.207.254.240/28;
deny all;
auth_basic "Restricted";
auth_basic_user_file passwd/weblogs;
}

location ~* \.(gif|jpg|jpeg|css|js|bmp|png)$ {
expires max;
}


if (-d $request_filename) {
rewrite ^/(.*)([^/])$ http://$host/$1$2/ permanent;
}
rewrite ^/slr/([0-9A-Za-z]+)/?$ /slr/yourls-go.php?id=$1 last;
rewrite ^/slr/([0-9A-Za-z]+)\+/?$ /slr/yourls-infos.php?id=$1 last;
rewrite ^/slr/([0-9A-Za-z]+)\+all/?$ /slr/yourls-infos.php?id=$1&all=1 last;

error_log /data/httplogs/host1-error.log;
access_log /data/httplogs/host1-aceess.log main;

}
###setting start,add by script###########
server {
listen 443;
server_name host1 momo.im www.momo.im;
index index.html index.htm index.php;
root /data/wwwroot/host1/webroot;
ssl on;
#ssl_protocols SSLv3 TLSv1;
#ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
#ssl_prefer_server_ciphers on;
ssl_session_timeout 5m;
ssl_certificate /usr/local/nginx/conf/ssl/momo_im.pem;
ssl_certificate_key /usr/local/nginx/conf/ssl/momo.im.new.key;
#error_page 404 /404error/404.html;
#error_page 500 502 503 504 /404error/50x.html;
location = /favicon.ico {
log_not_found off;
}

location ~ .*\.php?$
{
include fastcgi_params;
fastcgi_pass 127.0.0.1:10080;
#fastcgi_pass unix:/usr/local/php/etc/php-cgi.socket;
fastcgi_index index.php;
fastcgi_connect_timeout 60;
fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
fastcgi_buffer_size 128k;
fastcgi_buffers 4 256k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 256k;
fastcgi_intercept_errors on;
fastcgi_param SCRIPT_FILENAME /data/wwwroot/host1/webroot$fastcgi_script_name;
}

location /intime {
push_channel_group pushmodule_chat;

location /intime/publish {
set $push_channel_id $arg_id; #static channel id
push_publisher;
push_message_timeout 5m;
push_message_buffer_length 0;
}
location /intime/subscribe {
#push_authorized_channels_only on;
set $push_channel_id $arg_id; #static channel id
push_subscriber;
send_timeout 3600; #so that nginx won't drop connections willy-nilly
}
}
location ~* ^/(?!intime) {
if (!-e $request_filename) {
rewrite ^/(.+)$ /index.php?kohana_uri=$1 last;
}
}
location ~ ^/upload/ {
root /data/upload/host1/upload;
expires 30d;
}

location ~* /upload/.*\.php$ {
deny all;
}

location ~ ^/cache/ {
root /data/upload/host1/upload;
}

location ~ ^/weblogs/ {
root /data/weblogs/host1;
allow 218.5.2.219;
allow 220.250.21.82;
allow 121.207.254.240/28;
deny all;
auth_basic "Restricted";
auth_basic_user_file passwd/weblogs;
}

location ~* \.(gif|jpg|jpeg|css|js|bmp|png)$ {
expires max;
}


if (-d $request_filename) {
rewrite ^/(.*)([^/])$ http://$host/$1$2/ permanent;
}
rewrite ^/slr/([0-9A-Za-z]+)/?$ /slr/yourls-go.php?id=$1 last;
rewrite ^/slr/([0-9A-Za-z]+)\+/?$ /slr/yourls-infos.php?id=$1 last;
rewrite ^/slr/([0-9A-Za-z]+)\+all/?$ /slr/yourls-infos.php?id=$1&all=1 last;

error_log /data/httplogs/host1-error.log;
access_log /data/httplogs/host1-aceess.log main;

}[/color]