Httpd – Apache 2.2.4: problems chroot with modsecurity

I've been installed mod_security. If i simply include in the httpd the configuration files of mod_security, it starts normally. Indeed, if i try to add SecChrootDir /mnt/chr , httpd will start, but at the request of the page it returns either 404 error or The connection was reset error (Firefox). The httpd error log reports continuously:

libgcc_s.so.1 must be installed for pthread_cancel to work
libgcc_s.so.1 must be installed for pthread_cancel to work
libgcc_s.so.1 must be installed for pthread_cancel to work
libgcc_s.so.1 must be installed for pthread_cancel to work
[Fri Jun 21 23:29:09.672309 2013] [core:notice] [pid 4591:tid 140152074479488] AH00052: child pid 16365 exit signal Aborted (6)
[Fri Jun 21 23:29:09.672396 2013] [core:notice] [pid 4591:tid 140152074479488] AH00052: child pid 16366 exit signal Aborted (6)
[Fri Jun 21 23:29:09.672423 2013] [core:notice] [pid 4591:tid 140152074479488] AH00052: child pid 16367 exit signal Aborted (6)
[Fri Jun 21 23:29:09.672446 2013] [core:notice] [pid 4591:tid 140152074479488] AH00052: child pid 16369 exit signal Aborted (6)
libgcc_s.so.1 must be installed for pthread_cancel to work
[Fri Jun 21 23:29:11.675957 2013] [core:notice] [pid 4591:tid 140152074479488] AH00052: child pid 16488 exit signal Aborted (6)
libgcc_s.so.1 must be installed for pthread_cancel to work
libgcc_s.so.1 must be installed for pthread_cancel to work
[Fri Jun 21 23:29:12.678989 2013] [core:notice] [pid 4591:tid 140152074479488] AH00052: child pid 16518 exit signal Aborted (6)
[Fri Jun 21 23:29:12.679099 2013] [core:notice] [pid 4591:tid 140152074479488] AH00052: child pid 16519 exit signal Aborted (6)

I checked for this file and i have this in /lib , /lib32 and lib64.
I also can't understand the 404 error if i have an index page.
How can i fix these problems?