HUP signal to nginx doesn't work Ubuntu14

[Kunal Pariani]

Hello, 
Am seeing an issue while sending HUP signal to nginx (for config reload) on Ubuntu14. It just kills the master process & doesn't start the new worker processes. The same works just fine on CentOS 6.6 64-bit 

$ ps -eaf | grep nginx 
zimbra 10860 1 0 16:05 ? 00:00:00 nginx: master process /opt/zimbra/nginx/sbin/nginx -c /opt/zimbra/conf/nginx.conf 
zimbra 10861 10860 0 16:05 ? 00:00:00 nginx: worker process 
zimbra 10862 10860 0 16:05 ? 00:00:00 nginx: worker process 
zimbra 10863 10860 0 16:05 ? 00:00:00 nginx: worker process 
zimbra 10864 10860 0 16:05 ? 00:00:00 nginx: worker process 
zimbra 18638 25945 0 16:22 pts/0 00:00:00 grep nginx 
zimbra 19994 1 0 Jun02 ? 00:01:51 /usr/bin/perl -w /opt/zimbra/libexec/zmstat-nginx 
$ 
$ kill -HUP 10860 
$ 
$ ps -eaf | grep nginx 
zimbra 10861 1 0 16:05 ? 00:00:00 nginx: worker process <------ same old worker processes & master process is killed 
zimbra 10862 1 0 16:05 ? 00:00:00 nginx: worker process 
zimbra 10863 1 0 16:05 ? 00:00:00 nginx: worker process 
zimbra 10864 1 0 16:05 ? 00:00:00 nginx: worker process 
zimbra 18666 18641 0 16:22 pts/1 00:00:00 tail -f log/nginx.log 
zimbra 18986 25945 0 16:23 pts/0 00:00:00 grep nginx 
zimbra 19994 1 0 Jun02 ? 00:01:51 /usr/bin/perl -w /opt/zimbra/libexec/zmstat-nginx 
$ 

>From nginx.log, i can see the SIGHUP is received 
2015/06/03 16:23:14 [notice] 10860#0: signal 1 (SIGHUP) received, reconfiguring 
2015/06/03 16:23:14 [debug] 10860#0: wake up, sigio 0 
2015/06/03 16:23:14 [notice] 10860#0: reconfiguring 
2015/06/03 16:23:14 [debug] 10860#0: posix_memalign: 00000000021EAA50:16384 @16 
2015/06/03 16:23:14 [debug] 10860#0: posix_memalign: 000000000223D570:32768 @16 

Any ideas on why this doesn't work on ubuntu only ? 

Thanks 
-Kunal 
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