Spender I'm not abler to understand the problem.
I've found out that with grsecurity-1.9.5-2.4.18 patch when I chroot apache by doing
chroot /www /apache/bin/apachectl startssl
It can't find the /lib/i686/libm.so.6
but that s.o. is in the /www/lib/i686/libm.so.6 directory!!!!!
with grsecurity 1.9.4 this not happens!