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Sometimes when I try to do a graceful restart by sending HUP to Nginx, I end up with a master process that never dies, it sticks around forever, and eventually my app becomes unresponsive and I have to do a hard restart.

There are never redundant worker processes.

It doesn't always happen and I can't figure out how to reproduce reliably.

I am running Nginx with Phusion Passenger.

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migrated from stackoverflow.com Mar 12 '12 at 20:27

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Such behaviour may be caused by third party module, for example passenger. –  CyberDem0n Feb 24 '12 at 3:30

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