ngx_slab_alloc() failed: no memory

[wandenberg]

ngx_slab_alloc() failed: no memory

[wandenberg]

Hi. First you have to check if this message is coming from the push stream
module or not generally the module write a specific message for its errors.
And check the configuration for shared memory size.
On Sep 19, 2016 17:39, "GoodGame" [email protected] wrote:

Hello!

We use a module with alot of server's config's.
After nginx start we have in error.log:

ngx_slab_alloc() failed: no memory

Nginx stop immediately.

On the server we have 128G memory.

What's wrong?

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[GoodGame]

Thanks for fast answer.

Error definitely associated with selective-cache-purge-module.

The error appears when i write line:
selective_cache_purge_redis_host "127.0.0.1";

And check the configuration for shared memory size.

How?

[GoodGame]

I have a lot of config's files:
$ ls -lah /etc/nginx/conf.d/ | wc -l
159

When i remove ~150 config's and i have 8 config's, nginx start.
If i add one more config, nginx refuse to start with previous error.

It only happens when i have line:
selective_cache_purge_redis_host "127.0.0.1";
in one config.

Debug version fail's to. With nothing than:
ngx_slab_alloc() failed: no memory
in error.log

nginx -V
nginx version: nginx/1.11.4 built by gcc 4.8.5 20150623 (Red Hat 4.8.5-4) (GCC) built with OpenSSL 1.0.1e-fips 11 Feb 2013 TLS SNI support enabled configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --with-threads --user=nginx --group=nginx --add-module=/builddir/build/BUILD/ngx_devel_kit --add-module=/builddir/build/BUILD/nginx-module-vts --add-module=/builddir/build/BUILD/headers-more-nginx-module --add-module=/builddir/build/BUILD/set-misc-nginx-module --add-module=/builddir/build/BUILD/redis2-nginx-module --add-module=/builddir/build/BUILD/nginx-vod-module --add-module=/builddir/build/BUILD/lua-nginx-module --add-module=/builddir/build/BUILD/nginx-upstream-dynamic-servers --add-module=/builddir/build/BUILD/nginx-selective-cache-purge-module --with-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_stub_status_module --with-http_dav_module --with-http_image_filter_module --with-http_mp4_module --with-http_secure_link_module --with-file-aio --with-http_v2_module --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic'

[GoodGame]

@wandenberg Sorry, could you help in this issue?

[wandenberg]

@GoodGame can you use the debuging branch and send me the log messages ?

[GoodGame]

Sure, but nothing in debug log, nginx just does not start ((

[GoodGame]

It's easy to reproduce:

Create one config file with many proxy_cache_path locations:

proxy_cache_path /tmp/xxx1 levels=1:2 keys_zone=xxx1:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
proxy_cache_path /tmp/xxx2 levels=1:2 keys_zone=xxx2:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
...
proxy_cache_path /tmp/xxx100 levels=1:2 keys_zone=xxx100:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;

And try to start nginx.
It will crush.

It does not matter proxy_cache_path will be in one file or one proxy_cache_path per one of 100 files.

[GoodGame]

user nginx;
worker_processes auto;
worker_rlimit_nofile 819200;

error_log /var/log/nginx/error.log debug;
pid /var/run/nginx.pid;

events {
  use epoll;
}

http {
  include /etc/nginx/mime.types;

  default_type application/octet-stream;

  server_tokens off;

  tcp_nopush on;
  tcp_nodelay on;
  sendfile on;

  proxy_cache_path /tmp/xxx1 levels=1:2 keys_zone=xxx1:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx2 levels=1:2 keys_zone=xxx2:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx3 levels=1:2 keys_zone=xxx3:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx4 levels=1:2 keys_zone=xxx4:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx5 levels=1:2 keys_zone=xxx5:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx6 levels=1:2 keys_zone=xxx6:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx7 levels=1:2 keys_zone=xxx7:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx8 levels=1:2 keys_zone=xxx8:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx9 levels=1:2 keys_zone=xxx9:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx10 levels=1:2 keys_zone=xxx10:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx11 levels=1:2 keys_zone=xxx11:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx12 levels=1:2 keys_zone=xxx12:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx13 levels=1:2 keys_zone=xxx13:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx14 levels=1:2 keys_zone=xxx14:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx15 levels=1:2 keys_zone=xxx15:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx16 levels=1:2 keys_zone=xxx16:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx17 levels=1:2 keys_zone=xxx17:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx18 levels=1:2 keys_zone=xxx18:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx19 levels=1:2 keys_zone=xxx19:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx20 levels=1:2 keys_zone=xxx20:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx21 levels=1:2 keys_zone=xxx21:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx22 levels=1:2 keys_zone=xxx22:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx23 levels=1:2 keys_zone=xxx23:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx24 levels=1:2 keys_zone=xxx24:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx25 levels=1:2 keys_zone=xxx25:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx26 levels=1:2 keys_zone=xxx26:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx27 levels=1:2 keys_zone=xxx27:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx28 levels=1:2 keys_zone=xxx28:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx29 levels=1:2 keys_zone=xxx29:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx30 levels=1:2 keys_zone=xxx30:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx31 levels=1:2 keys_zone=xxx31:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx32 levels=1:2 keys_zone=xxx32:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx33 levels=1:2 keys_zone=xxx33:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx34 levels=1:2 keys_zone=xxx34:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx35 levels=1:2 keys_zone=xxx35:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx36 levels=1:2 keys_zone=xxx36:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx37 levels=1:2 keys_zone=xxx37:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx38 levels=1:2 keys_zone=xxx38:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;
  proxy_cache_path /tmp/xxx39 levels=1:2 keys_zone=xxx39:10m loader_files=1000 loader_threshold=450 use_temp_path=off inactive=12h;

  selective_cache_purge_redis_host "127.0.0.1";
}

This simple config.

$ nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: [crit] ngx_slab_alloc() failed: no memory
nginx: configuration file /etc/nginx/nginx.conf test failed

[GoodGame]

@wandenberg Could you help?

[GoodGame]

https://github.com/wandenberg/nginx-selective-cache-purge-module/blob/5eecdf50f7c44ddb35e96a83fc809dd35166dbed/src/ngx_selective_cache_purge_module_setup.c#L287

If i set (8 * ngx_pagesize) in this line, nginx starts with config above.

I think there is error in shm_size calculation.

@wandenberg Can you fix it?