Unable to read from thread kernel pipe Apache fails when sending mail.

[Phara0h]

I get this from my http-error log :

[Wed Jan 19 18:47:05 2005] [notice] child pid 1850 exit signal Abort trap (6)
Fatal error 'Unable to read from thread kernel pipe' at line 1100 in file /usr/src/lib/libc_r/uthread/uthread_kern.c (errno = 0)
[Wed Jan 19 18:47:19 2005] [notice] child pid 1858 exit signal Abort trap (6)

This happends everytime I try to use the mail() function in php.

I run

FreeBSD :
FreeBSD box1.siteman.no 5.3-RELEASE-p5 FreeBSD 5.3-RELEASE-p5 #1: Wed Jan 19 15:43:49 CET 2005 martin@box1.siteman.no:/usr/obj/usr/src/sys/custom i386

Apache 2.0.0.52
PHP 4.3.9

Any help is much apriciated...