Nginx crashing with sigtimedwait in error logs

My nginx server has crashed about 4 times over the past 2 days. MySQL,
php-cgi, etc continues to run, just the nginx server itself crashes.

When I look in the nginx error logs, I see this line when it crashes:
sigtimedwait() failed (4: Interrupted system call)

Any ideas what this is? I tried searching Google and it came up with a
couple foreign sites, so it doesn’t seem to be a common issue.

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,55828,55828#msg-55828

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