I found out who the culprit is. It's the platform.
The following patch disables the broken sendfile() implementation
on s390-ibm-linux-gnu (see attachment).
After that patch, httpd-2.0 works both threaded and preforked.
Thanks,
Martin
--
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Index: srclib/apr/configure.in
===================================================================
RCS file: /home/cvs/apache/apr/configure.in,v
retrieving revision 1.231
diff -u -r1.231 configure.in
--- srclib/apr/configure.in 2001/02/20 03:03:34 1.231
+++ srclib/apr/configure.in 2001/02/21 13:56:52
@@ -648,6 +648,9 @@
*alpha*-dec-osf* )
sendfile="0"
;;
+ s390-*-linux-gnu)
+ sendfile="0"
+ ;;
esac
if test "$orig_sendfile" != "$sendfile"; then
echo "sendfile support disabled to avoid system problem"