DO NOT UPGRADE !!!
It's because it has some FD_OPEN limits that prevents it from starting with more than about 300 domains
As soon I've upgrade all pages are down and log is getting something like this:
[Mon Apr 28 21:31:36 2014] [notice] child pid 17967 exit signal Segmentation fault (11)
[Mon Apr 28 21:31:36 2014] [notice] child pid 17995 exit signal Segmentation fault (11)
[Mon Apr 28 21:31:38 2014] [notice] child pid 18081 exit signal Segmentation fault (11)
[Mon Apr 28 21:31:40 2014] [notice] child pid 18164 exit signal Segmentation fault (11)
[Mon Apr 28 21:31:42 2014] [notice] child pid 18246 exit signal Segmentation fault (11)
[Mon Apr 28 21:31:43 2014] [notice] child pid 18301 exit signal Segmentation fault (11)
[Mon Apr 28 21:31:43 2014] [notice] child pid 18329 exit signal Segmentation fault (11)
[Mon Apr 28 21:31:45 2014] [notice] child pid 18412 exit signal Segmentation fault (11)
[Mon Apr 28 21:31:46 2014] [notice] child pid 18467 exit signal Segmentation fault (11)
[Mon Apr 28 21:31:46 2014] [notice] child pid 18504 exit signal Segmentation fault (11)
[Mon Apr 28 21:31:48 2014] [notice] child pid 18592 exit signal Segmentation fault (11)
[Mon Apr 28 21:31:50 2014] [notice] child pid 18675 exit signal Segmentation fault (11)
[Mon Apr 28 21:31:52 2014] [notice] child pid 18759 exit signal Segmentation fault (11)
[Mon Apr 28 21:31:54 2014] [notice] child pid 18859 exit signal Segmentation fault (11)
httpd.event[15555]: segfault at 2fc ip 00007f98a5519fdc sp 00007f989bffeb50 error 4 in mod_fastcgi.so[7f98a5512000+13000]
httpd.event[15696]: segfault at 2001196c ip 00007f98a5519fdc sp 00007f989b7fdb50 error 4 in mod_fastcgi.so[7f98a5512000+13000]
httpd.event[15722]: segfault at 82c ip 00007f98a5519fdc sp 00007f98a0eafb50 error 4 in mod_fastcgi.so[7f98a5512000+13000]
httpd.event[16501]: segfault at 411c2c ip 00007f98a5519fdc sp 00007f9899ffab50 error 4 in mod_fastcgi.so[7f98a5512000+13000]
httpd.event[17156]: segfault at 385c01194c ip 00007f98a5519fdc sp 00007f98987f7b50 error 4 in mod_fastcgi.so[7f98a5512000+13000]
httpd.event[17405]: segfault at cc ip 00007f98a5519fdc sp 00007f989a7fbb50 error 4 in mod_fastcgi.so[7f98a5512000+13000]
httpd.event[18961]: segfault at 82c01217c ip 00007f98a5519fdc sp 00007f98937edb50 error 4 in mod_fastcgi.so[7f98a5512000+13000]
httpd.event[19128]: segfault at 16001191c ip 00007f98a5519fdc sp 00007f9898ff8b50 error 4
httpd.event[19138]: segfault at 20118ec ip 00007f98a5519fdc sp 00007f9893feeb50 error 4 in mod_fastcgi.so[7f98a5512000+13000]
in mod_fastcgi.so[7f98a5512000+13000]
httpd.event[19186]: segfault at 3c0118fc ip 00007f98a5519fdc sp 00007f98987f7b50 error 4 in mod_fastcgi.so[7f98a5512000+13000]
httpd.event[19533]: segfault at 3801196c ip 00007f98a5519fdc sp 00007f9894ff0b50 error 4 in mod_fastcgi.so[7f98a5512000+13000]
httpd.event[19610]: segfault at 1001196c ip 00007f98a5519fdc sp 00007f98997f9b50 error 4 in mod_fastcgi.so[7f98a5512000+13000]
httpd.event[20646]: segfault at 1801187c ip 00007f98a5519fdc sp 00007f9896ff4b50 error 4 in mod_fastcgi.so[7f98a5512000+13000]
httpd.event[20809]: segfault at 20118fc ip 00007f98a5519fdc sp 00007f98987f7b50 error 4 in mod_fastcgi.so[7f98a5512000+13000]
httpd.event[21066]: segfault at 2118fc ip 00007f98a5519fdc sp 00007f989a7fbb50 error 4
httpd.event[21071]: segfault at 10118fc ip 00007f98a5519fdc sp 00007f9897ff6b50 error 4 in mod_fastcgi.so[7f98a5512000+13000] in mod_fastcgi.so[7f98a5512000+13000]