求助，分析日志，是不是被攻击？

wllhc

系统中产生不少僵死的http进程，以至于apache无法访问，在apache的error_log里有相当多的类似于
Tue Apr 18 16:31:42 2006] [notice] child pid 8035 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:42 2006] [notice] child pid 8037 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:43 2006] [notice] child pid 8039 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:43 2006] [notice] child pid 8040 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:43 2006] [notice] child pid 8041 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:43 2006] [notice] child pid 8042 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:43 2006] [notice] child pid 8043 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:43 2006] [notice] child pid 8044 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:43 2006] [notice] child pid 8045 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:43 2006] [notice] child pid 8053 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:43 2006] [notice] child pid 8055 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:44 2006] [notice] child pid 8057 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:44 2006] [notice] child pid 8058 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:44 2006] [notice] child pid 8059 exit signal File size limit exceeded (25)
[Tue Apr 18 16:31:45 2006] [notice] child pid 8060 exit signal File size limit exceeded (25)
的记录，请大家帮忙分析一下。是不是被攻击了？