It turns out that removing the "max_size=1000m inactive=1m" attributes for the proxy_cache_path directive removes the constant core-dumping crashiness that we have been experiencing.

Any thoughts as to why this may be the case would be interesting.

phil.

On Nov 18, 2010, at 3:52 PM, Philip Jacob wrote:

> Forgot the config file.
>
> phil.
>
> user nobody;
> worker_processes 1;
>
> #error_log logs/error.log;
> #error_log logs/error.log notice;
> #error_log logs/error.log info;
>
> #pid logs/nginx.pid;
>
> worker_rlimit_nofile 65535;
> working_directory /opt/local/nginx/cores/;
> worker_rlimit_core 500M;
>
> events {
> worker_connections 10240;
> }
>
> http {
>
> server_tokens off;
>
> 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"';
>
> access_log logs/access.log main;
>
> sendfile on;
> #tcp_nopush on;
>
> #keepalive_timeout 0;
> keepalive_timeout 5;
>
> gzip on;
>
> # Only for pre-production testing
> include xxx-network.include;
>
> proxy_cache_path /var/www/cache levels=1:2 keys_zone=myhostname-cache:8m max_size=1000m inactive=1m;
> proxy_temp_path /var/www/cache/tmp;
> proxy_cache_methods GET;
>
> server {
> listen 80 default;
> server_name www.myhostname.com secure.myhostname.com www.myhostname.com.xxx.net;
>
> proxy_cache_use_stale updating;
> proxy_cache_valid 200 1m;
> proxy_cache_key "$scheme://$proxy_host$request_uri $cookie_a $cookie_JSESSIONID $cookie_b $cookie_c";
> proxy_buffer_size 64k;
> proxy_buffers 32 64k;
>
> charset utf-8;
>
> access_log logs/www.myhostname.com.access.log main;
>
> # This turns out to be critically important. Otherwise, it sends Nginx in a loop on the homepage
> # and it SSIs the homepage into itself over 200 times. This seems like a bug in Nginx, so be aware
> # of it during upgrades.
> location /foo {
> ssi off;
> proxy_pass http://127.0.0.1:8080/foo;
> }
>
> location / {
> ssi on;
> ssi_silent_errors off;
> log_subrequest on;
>
> ########################################################################################
> # NOTE / IMPORTANT / URGENT / README / ATTENTION / ACHTUNG / ATTENZIONE /
> ########################################################################################
> #
> # These settings MUST be changed together. If you turn caching off by commenting out the
> # proxy cache directive, you MUST to change X-Caching-Mode to "Off". Valid values for this
> # header are On/Off. FooCode, foo.jsp, the /foo controller and the
> # esi.tag all rely on this being handled properly.
> #
>
> proxy_set_header X-Caching-Mode On;
> proxy_cache myhostname-cache;
>
> #
> ########################################################################################
>
>
> proxy_pass http://127.0.0.1:8080/;
> root html;
> index index.html index.htm;
>
> # For the ESI-like webhit-recording servlet to know what the original URI is.
> proxy_set_header X-Original-Request-URI $request_uri;
> proxy_set_header X-Original-Request-Method $request_method;
>
> # First added for spring security to redirect correctly for protected pages
> proxy_set_header Host $http_host;
>
> # http://wiki.nginx.org/NginxLikeApache
> proxy_set_header X-Forwarded-Host $host;
> proxy_set_header X-Forwarded-Server $host;
> proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
>
> # Make things served up by this nginx instance totally non-cacheable to the outside world.
> # This is complex and has implications if you change it. Discuss laboriously with your teammates.
> expires epoch;
>
> # Pre-launch stuff.
> # error_page 403 http://x.myhostname.com/;
>
> satisfy any;
>
> # For blocking access to everything except the xxx net.
> # include xxx-network.include; <-- this file format needs redone.
>
> # Open up to xxx
> include xxx-network.include;
>
> # Open up to xxx
> allow xxx;
> allow xxx;
>
> # Leave these in always - the local net and xxx.
> allow xxx;
> allow xxx;
>
> # xxx box for load testing
> allow xxx;
>
> # Otherwise block.
> deny all;
>
> # Put a password on stuff, per xxx.
> auth_basic "myhostname";
> auth_basic_user_file .htpasswd;
>
> # redirect server error pages to the static page /50x.html
> #
> error_page 500 502 503 504 /50x.html;
> location = /50x.html {
> root html;
> }
>
> }
> }
>
>
> # myhostname.com - perm redirect to www
> server {
> server_name myhostname.com;
> rewrite ^/(.*) http://www.myhostname.com/$1 permanent;
> }
>
> # static assets
> server {
> server_name semi-1.prod.xxx.net xxx.prod.xxx.net;
> root /var/www/domains/prod.xxx.net/semi-1/htdocs/;
> expires max;
>
> location ~ /.svn/* {
> deny all;
> }
>
> }
>
> }
>
> On Nov 18, 2010, at 2:55 PM, Philip Jacob wrote:
>
>> I'm experiencing a problem with Nginx 0.8.53 crashing under moderate load. It's configured as a proxy with ssi enabled. Config file, backtrace, et al are below (the only modifications are hostnames to protect the innocent). I don't have a debug log, but I have a lot of other useful info.
>>
>> phil.
>>
>> ##################################################################
>> 2010/11/16 14:55:19 [alert] 7568#0: worker process 7569 exited on signal 11 (core dumped)
>>
>> ####################################################################
>> [phil@web01 nginx]$ /opt/local/nginx/sbin/nginx -V
>> nginx version: nginx/0.8.53
>> built by gcc 4.1.2 20080704 (Red Hat 4.1.2-48)
>> configure arguments: --prefix=/opt/local/nginx --with-http_realip_module
>>
>> ####################################################################
>> sudo gdb /opt/local/nginx/sbin/nginx /tmp/core.27113
>> [sudo] password for phil:
>> GNU gdb (GDB) Red Hat Enterprise Linux (7.0.1-23.el5_5.2)
>> Copyright (C) 2009 Free Software Foundation, Inc.
>> License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
>> This is free software: you are free to change and redistribute it.
>> There is NO WARRANTY, to the extent permitted by law. Type "show copying"
>> and "show warranty" for details.
>> This GDB was configured as "i386-redhat-linux-gnu".
>> For bug reporting instructions, please see:
>> http://www.gnu.org/software/gdb/bugs/...
>> Reading symbols from /opt/local/nginx-0.8.53/sbin/nginx...done.
>>
>> warning: .dynamic section for "/lib/libc.so.6" is not at the expected address
>>
>> warning: difference appears to be caused by prelink, adjusting expectations
>> Reading symbols from /lib/libcrypt.so.1...(no debugging symbols found)...done.
>> Loaded symbols for /lib/libcrypt.so.1
>> Reading symbols from /lib/libpcre.so.0...(no debugging symbols found)...done.
>> Loaded symbols for /lib/libpcre.so.0
>> Reading symbols from /lib/libcrypto.so.6...(no debugging symbols found)...done.
>> Loaded symbols for /lib/libcrypto.so.6
>> Reading symbols from /usr/lib/libz.so.1...(no debugging symbols found)...done.
>> Loaded symbols for /usr/lib/libz.so.1
>> Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done.
>> Loaded symbols for /lib/libc.so.6
>> Reading symbols from /lib/libdl.so.2...(no debugging symbols found)...done.
>> Loaded symbols for /lib/libdl.so.2
>> Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done.
>> Loaded symbols for /lib/ld-linux.so.2
>> Reading symbols from /lib/libnss_files.so.2...(no debugging symbols found)...done.
>> Loaded symbols for /lib/libnss_files.so.2
>> Core was generated by `nginx: worker process '.
>> Program terminated with signal 11, Segmentation fault.
>> #0 ngx_rbtree_min (tree=0xb778c040, node=0xb778d380) at src/core/ngx_rbtree.h:75
>> 75 while (node->left != sentinel) {
>> (gdb) bt
>> #0 ngx_rbtree_min (tree=0xb778c040, node=0xb778d380) at src/core/ngx_rbtree.h:75
>> #1 ngx_rbtree_delete (tree=0xb778c040, node=0xb778d380) at src/core/ngx_rbtree.c:178
>> #2 0x080856e0 in ngx_http_file_cache_free (c=0x85bbe9c, tf=0x0) at src/http/ngx_http_file_cache.c:941
>> #3 0x0807be76 in ngx_http_upstream_finalize_request (r=0x85c7fa0, u=0x85bbc0c, rc=499) at src/http/ngx_http_upstream.c:3002
>> #4 0x0807e005 in ngx_http_upstream_next (r=0x85c7fa0, u=0x85bbc0c, ft_type=4) at src/http/ngx_http_upstream.c:2834
>> #5 0x0807e0fb in ngx_http_upstream_process_header (r=0x85c7fa0, u=0x85bbc0c) at src/http/ngx_http_upstream.c:1459
>> #6 0x0807c965 in ngx_http_upstream_handler (ev=0x0) at src/http/ngx_http_upstream.c:895
>> #7 0x0805df3f in ngx_event_expire_timers () at src/event/ngx_event_timer.c:149
>> #8 0x0805de76 in ngx_process_events_and_timers (cycle=0x85b5e08) at src/event/ngx_event.c:261
>> #9 0x08063913 in ngx_worker_process_cycle (cycle=0x85b5e08, data=0x0) at src/os/unix/ngx_process_cycle.c:795
>> #10 0x08062201 in ngx_spawn_process (cycle=0x85b5e08, proc=0x806385b <ngx_worker_process_cycle>, data=0x0,
>> name=0x80a3a81 "worker process", respawn=-3) at src/os/unix/ngx_process.c:196
>> #11 0x08062f22 in ngx_start_worker_processes (cycle=0x85b5e08, n=1, type=-3) at src/os/unix/ngx_process_cycle.c:355
>> #12 0x08063e97 in ngx_master_process_cycle (cycle=0x85b5e08) at src/os/unix/ngx_process_cycle.c:136
>> #13 0x0804b4ff in main (argc=3, argv=0xbfd5b294) at src/core/nginx.c:401
>>
>>
>>
>

--
Philip Jacob
http://www.whirlycott.com/phil/





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