Hello!

On Sun, Nov 13, 2011 at 07:06:02AM -0500, Long Wan wrote:

> I have faced a trouble with nginx runs as a http revers proxy server,the
> worker process sometimes hanging there, cpu usage up to 100%,it's never
> recovey until i kill the process,below is the detail informations:

[...]

> trouble:
> [root@host-22 ~]# ps aux|grep -e CPU -e nginx
> USER PID %CPU %MEM VSZ RSS TTY STAT START TIME
> COMMAND
> root 936 0.0 0.0 49328 7572 ? Ss Nov11 2:37 nginx:
> master process /usr/local/nginx/sbin/nginx
> www 1130 99.9 0.0 55764 13472 ? R Nov11 2664:28 nginx:
> worker process
> www 1216 99.9 0.0 53668 11092 ? R Nov11 2660:23 nginx:
> worker process
> www 31057 0.0 0.0 50816 8820 ? S 19:40 0:00 nginx:
> worker process

[...]

> two nginx worker processes(pid 1130,1216) are hanging. there is nothing
> significant message i can found in error.log or strace (-p 1130|1216).

Please try attaching to a runaway process with gdb and check where
it loops, i.e.

gdb /path/to/nginx <pid>
bt
n
.... (repeat 'n' several times to see loop)

Maxim Dounin

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