Any hanging/error should be available in your log files.

Cross-check access and error logs and you will probably find unusual
entries you seek for.
---
*B. R.*

On Fri, Sep 19, 2014 at 9:50 PM, igorhmm <nginx-forum@nginx.us> wrote:

> Hi BR,
>
> I don't known how to reproduce, not yet :-)
>
> I couldn't identify which worker was responding too, but I can see with
> strace warnings in the old wolker about EAGAIN (Resource temporarily
> unavailable). I can see that because old workers still running:
>
> USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
> nginx 6009 0.0 0.2 71020 18532 ? S Sep18 0:37 nginx:
> worker process is shutting down
> nginx 6010 0.0 0.2 71028 18496 ? S Sep18 0:12 nginx:
> worker process is shutting down
> nginx 6289 0.2 0.3 75672 23188 ? S 07:54 0:58 nginx:
> worker process is shutting down
> nginx 6290 0.0 0.2 71932 19248 ? S 07:54 0:15 nginx:
> worker process is shutting down
> nginx 9182 0.0 0.2 70872 18380 ? S 10:20 0:02 nginx:
> worker process is shutting down
> nginx 9295 0.0 0.2 70952 18380 ? S 10:26 0:02 nginx:
> worker process is shutting down
> nginx 9297 0.0 0.2 70368 17856 ? S 10:26 0:02 nginx:
> worker process is shutting down
> nginx 9302 0.0 0.2 70804 18296 ? S 10:26 0:01 nginx:
> worker process is shutting down
> nginx 10132 0.2 0.2 74776 22280 ? S 10:53 0:47 nginx:
> worker process is shutting down
> nginx 10133 0.0 0.2 71484 18972 ? S 10:53 0:09 nginx:
> worker process is shutting down
> nginx 13690 0.2 0.2 72876 20296 ? S 14:22 0:10 nginx:
> worker process
> nginx 13691 0.1 0.2 71492 19088 ? S 14:22 0:07 nginx:
> worker process
> nginx 13692 0.0 0.0 57292 3180 ? S 14:22 0:00 nginx:
> cache manager process
> root 29863 0.0 0.0 57292 4048 ? Ss Sep11 0:00 nginx:
> master process /usr/sbin/nginx -c /etc/nginx/nginx.conf
> nginx 30956 0.0 0.2 72924 20336 ? S Sep18 0:23 nginx:
> worker process is shutting down
> [/code]
>
> Looking for our user's usage, this workers will stay online for more few
> hours :)
>
> The difference between old and new configuration is just a "down" flag in
> one of our servers from our websockets pool (upstream). You can see a
> simplified version of config on: http://pastebin.com/02GQQ22r
>
> Really thanks for your attention.
>
> Igor
>
> Posted at Nginx Forum:
> http://forum.nginx.org/read.php?2,221591,253431#msg-253431
>
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