Re: After reload, nginx's CPU usage jumped to 100 percent（backtrace provided)

[Maxim Dounin]

Hello!

On Tue, Jul 12, 2011 at 09:31:07PM +0800, 杨镭 wrote:

> After reload, all the worker processes, including newly forked ones, goes
> straight to 100% CPU:

[...]

> Also, we took backtrace for cache manger process:
> 
> 
> Attaching to process 17306
> ngx_http_file_cache_expire (data=<value optimized out>) at
> src/http/ngx_http_file_cache.c:1096
> 1096            if (fcn->count == 0) {
> (gdb) bt
> #0  ngx_http_file_cache_expire (data=<value optimized out>) at
> src/http/ngx_http_file_cache.c:1096

Could you please show

p *fcn

?

I think I see the problem, but just to make sure.

If you are able to reproduce the problem please try the following 
patch:

diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -1099,7 +1099,8 @@ ngx_http_file_cache_expire(ngx_http_file
         }

         if (fcn->deleting) {
-            continue;
+            wait = 1;
+            break;
         }

         p = ngx_hex_dump(key, (u_char *) &fcn->node.key,


Maxim Dounin