Following an upgrade from nginx 1.0.2 to 1.0.11 I've experienced a problem with worker processes that are not shutting down. When looking in the list of running processes the worker processes appears to be shutting down but never actually exits.

I've been using the ubuntu nginx ppa's for maverick.

As the worker processes doesn't shut down nginx ends up consuming to much memory and is ultimately unable to spawn new worker processes.

Below is a list of processes showing the problem:

www-data 560 0.5 4.2 376376 321760 ? S 20:04 0:07 nginx: worker process is shutting down
www-data 562 0.1 4.2 376376 321720 ? S 20:04 0:01 nginx: worker process is shutting down
www-data 1029 0.2 4.2 377712 323092 ? S 20:10 0:02 nginx: worker process is shutting down
www-data 1030 0.0 4.2 377712 322992 ? S 20:10 0:00 nginx: worker process is shutting down
www-data 1093 0.2 4.2 377972 323300 ? S 20:11 0:02 nginx: worker process is shutting down
www-data 1094 0.0 4.2 377972 323260 ? S 20:11 0:00 nginx: worker process is shutting down
www-data 1095 0.0 4.2 377972 323300 ? S 20:11 0:00 nginx: worker process is shutting down
www-data 1158 0.0 4.2 377972 323272 ? S 20:12 0:00 nginx: worker process is shutting down
www-data 1342 0.4 4.2 377972 323300 ? S 20:14 0:03 nginx: worker process is shutting down
www-data 1879 0.1 4.2 376928 322220 ? S 20:21 0:00 nginx: worker process is shutting down
www-data 1881 0.4 4.2 376928 322260 ? S 20:21 0:01 nginx: worker process is shutting down
www-data 2190 0.1 4.2 377972 323052 ? S 20:25 0:00 nginx: worker process is shutting down
www-data 2193 2.4 4.2 377972 323348 ? S 20:25 0:04 nginx: worker process is shutting down
www-data 2194 0.5 4.2 377972 323272 ? S 20:25 0:01 nginx: worker process is shutting down
www-data 2376 0.3 4.1 375884 321060 ? S 20:28 0:00 nginx: worker process
www-data 2377 0.5 4.1 375884 320320 ? S 20:28 0:00 nginx: worker process
www-data 2378 0.2 4.1 375884 319780 ? S 20:28 0:00 nginx: worker process
www-data 2379 4.0 4.1 375884 321192 ? S 20:28 0:02 nginx: worker process
ubuntu 2576 0.0 0.0 7964 900 pts/1 R+ 20:29 0:00 grep --color=auto nginx
root 3185 8.2 4.1 373960 318980 ? Rs Jan09 1854:37 nginx: master process nginx
www-data 25687 0.1 4.2 377420 322804 ? S 18:28 0:12 nginx: worker process is shutting down
www-data 25688 0.1 4.2 377420 322768 ? S 18:28 0:10 nginx: worker process is shutting down
www-data 25689 0.2 4.2 377420 322804 ? S 18:28 0:17 nginx: worker process is shutting down
www-data 26682 0.1 4.2 377676 323076 ? S 18:41 0:10 nginx: worker process is shutting down
www-data 27287 0.2 4.2 377004 322344 ? S 18:49 0:15 nginx: worker process is shutting down
www-data 27289 0.0 4.2 377004 322276 ? S 18:49 0:04 nginx: worker process is shutting down
www-data 27290 0.1 4.2 377004 322356 ? S 18:49 0:10 nginx: worker process is shutting down
www-data 29293 0.0 4.2 376608 322116 ? S 19:15 0:04 nginx: worker process is shutting down
www-data 29619 0.0 4.2 376608 322076 ? S 19:20 0:02 nginx: worker process is shutting down
www-data 29620 0.1 4.2 376608 322116 ? S 19:20 0:04 nginx: worker process is shutting down
www-data 30116 0.0 4.2 376608 322068 ? S 19:26 0:02 nginx: worker process is shutting down
www-data 30497 0.0 4.2 376608 322064 ? S 19:31 0:03 nginx: worker process is shutting down
www-data 31235 0.1 4.2 376536 321904 ? S 19:41 0:05 nginx: worker process is shutting down
www-data 31817 0.0 4.2 376544 321896 ? S 19:49 0:01 nginx: worker process is shutting down
www-data 31938 0.1 4.2 376460 321848 ? S 19:50 0:03 nginx: worker process is shutting down
www-data 31939 0.0 4.2 376460 321724 ? S 19:50 0:01 nginx: worker process is shutting down
www-data 32368 0.5 4.2 376412 321800 ? S 19:56 0:10 nginx: worker process is shutting down