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Start the server if another user has a PID matching our stale pidfile.

If unicorn doesn't get terminated cleanly (for example if the machine
has its power interrupted) and the pid in the pidfile gets used by
another process, the current unicorn code will exit and not start a
server. This tiny patch fixes that behaviour.

Acked-by: Eric Wong <>
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bleach authored and Eric Wong committed Feb 29, 2012
1 parent b6a154e commit 2ce57950e0f61eb6f325a93cef9b7e0e598fc109
Showing with 1 addition and 1 deletion.
  1. +1 −1 lib/unicorn/http_server.rb
@@ -656,7 +656,7 @@ def valid_pid?(path)
wpid <= 0 and return
Process.kill(0, wpid)
- rescue Errno::ESRCH, Errno::ENOENT
+ rescue Errno::ESRCH, Errno::ENOENT, Errno::EPERM
# don't unlink stale pid files, racy without non-portable locking...

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