2.4.x patch: http://people.apache.org/~minfrin/httpd-mod_dav-errorhandling.patch
+1: minfrin
+ * event MPM: Provide error handling for ThreadStackSize. PR 54311
+ trunk patch: http://svn.apache.org/r1433682
+ 2.4.x patch: http://people.apache.org/~minfrin/httpd-event-ThreadStackSize-error.patch
+ +1: minfrin
+
A list of further possible backports can be found at:
http://people.apache.org/~rjung/patches/possible-backports-httpd-trunk-2_4.txt