[exim] Exim kernel segfaults - Error 4

Does anyone know what would cause Exim to segfault with Error 4? What is
error 4?

Mar 6 14:02:41 pascal kernel: exim[26817]: segfault at 0000000000000000
rip 0000003254278eb0 rsp 00007fff0dd7f178 error 4
Mar 6 14:02:53 pascal kernel: exim[18416]: segfault at 0000000000000000
rip 0000003254278eb0 rsp 00007fff0dd7f178 error 4
Mar 6 14:02:56 pascal kernel: exim[23424]: segfault at 0000000000000000
rip 0000003254278eb0 rsp 00007fff0dd7f178 error 4

I'm getting a lot of these.

I'm running 64 bit fedora 8 with latest stock Fedora kernel and the 4.68
version of Exim.

Thanks in advance.