php-cgi frozen with sbwait when SMP enable

[Ken Chen]

Hello,

I have 4 web servers with lighttpd to serve one web site with DNS load
sharing.  On the 2 SMP-enable web servers, there will be many php-cgi frozen
in 'sbwait' state every day. It means the php-cgi stay in 'sbwait' state,
and never be back to 'accept' or other state. If I restart them, there will
be frozen php-cgi appear some hours later.

There is no problem on the other single CPU web servers which running same
php scripts and same configuration and version of PHP.

Why and any solution?

Thanks!


Regards,
Ken