php or memory?

Get this messages:

Oct 18 08:29:51 h1 kernel: php[23554]: segfault at 0000000003d69ef8 rip 00000037ac068ea4 rsp 00007fffffffe320 error 4
Oct 18 08:30:14 h1 kernel: php[23374]: segfault at 0000000003d710c8 rip 00000037ac068ea4 rsp 00007fffffffe320 error 4
Oct 18 08:44:26 h1 kernel: php[18617]: segfault at 0000000003d40968 rip 00000037ac068ea4 rsp 00007fffffffe320 error 4
Oct 18 08:44:33 h1 kernel: php[20059]: segfault at 0000000003d791c8 rip 00000037ac068ea4 rsp 00007fffffffe320 error 4
Oct 18 08:45:43 h1 kernel: php[20073]: segfault at 0000000003275f98 rip 00000037ac069dd1 rsp 00007fffffffea30 error 4
Oct 18 08:53:44 h1 kernel: php[20207]: segfault at 0000000003d8c6d8 rip 00000037ac068ea4 rsp 00007fffffffe320 error 4