I've searched in httpd.conf, but there is no p'am_free_data
some more info:
ldd /lib/libpam.so.0
libc.so.6 => /lib/libc.so.6 (0x40011000)
libdl.so.2 => /lib/libdl.so.2 (0x40146000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)
ldd /etc/httpd/modules/libphp4.so
libpam.so.0 => /lib/libpam.so.0 (0x40199000)
libdl.so.2 => /lib/libdl.so.2 (0x401a1000)
libltdl.so.3 => /usr/lib/libltdl.so.3 (0x401a5000)
libpspell-modules.so.1 => /usr/lib/libpspell-modules.so.1 (0x401ab000)
libstdc++-libc6.2-2.so.3 => /usr/lib/libstdc++-libc6.2-2.so.3 (0x401ad000)
libc.so.6 => /lib/libc.so.6 (0x401ef000)
libcrypt.so.1 => /lib/libcrypt.so.1 (0x40325000)
libpng.so.2 => /usr/lib/libpng.so.2 (0x40352000)
libz.so.1 => /usr/lib/libz.so.1 (0x40373000)
libcrypto.so.2 => /lib/libcrypto.so.2 (0x40381000)
libssl.so.2 => /lib/libssl.so.2 (0x40444000)
libresolv.so.2 => /lib/libresolv.so.2 (0x40471000)
libexpat.so.0 => /usr/lib/libexpat.so.0 (0x40483000)
libmm.so.11 => /usr/lib/libmm.so.11 (0x404a1000)
libpspell.so.4 => /usr/lib/libpspell.so.4 (0x404a6000)
libncurses.so.5 => /usr/lib/libncurses.so.5 (0x404c0000)
libgmp.so.3 => /usr/lib/libgmp.so.3 (0x40501000)
libgd.so.1.8 => /usr/lib/libgd.so.1.8 (0x40522000)
libxml2.so.2 => /usr/lib/libxml2.so.2 (0x40554000)
libdb-3.2.so => /lib/libdb-3.2.so (0x405f5000)
libgdbm.so.2 => /usr/lib/libgdbm.so.2 (0x4069c000)
libcurl.so.1 => /usr/lib/libcurl.so.1 (0x406a3000)
libbz2.so.1 => /usr/lib/libbz2.so.1 (0x406be000)
libm.so.6 => /lib/libm.so.6 (0x406ce000)
libttf.so.2 => /usr/lib/libttf.so.2 (0x406f0000)
libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x4071a000)
libjpeg.so.62 => /usr/lib/libjpeg.so.62 (0x4074f000)
libnsl.so.1 => /lib/libnsl.so.1 (0x4076e000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)
looks normal
any other thoughs