nginx worker process hang,cpu load 100%

[Maxim Dounin]

Hello!

On Sun, Nov 13, 2011 at 08:28:49PM -0500, Long Wan wrote:

> Hello Maxim,Thanks for your reply, I tried gdb as you tolde me , it
> reported something :

[...]

> (gdb) bt
> #0  ngx_http_upstream_get_round_robin_peer (pc=0x78166f0, data=<value
> optimized out>) at src/http/ngx_http_upstream_round_robin.c:413
> #1  0x000000000041a8fc in ngx_event_connect_peer (pc=0x78166f0) at
> src/event/ngx_event_connect.c:24
> #2  0x000000000043d1e8 in ngx_http_upstream_connect (r=0x7cf6310,
> u=0x78166e0) at src/http/ngx_http_upstream.c:1089
[...]
> (gdb) n
> 
> there is no output when type 'n', should i recompile nginx with
> '--with-debug' configure option ?

This looks very similar to this problem, fixed in 1.1.1/1.0.7:

    *) Bugfix: nginx hogged CPU if all servers in an upstream were marked as
       "down".

Are you sure you see the same problem in 1.0.9?

Maxim Dounin