FreeBSD 5.4-STABLE, some core dumps

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Hi,

Lately my dual xeon server has been core dumping with signal 10 with a 
lot of programs:

18:06:21 SRV_NAME kernel: pid 22681 (proxymap), uid 125: exited on signal 10
18:06:29 SRV_NAME kernel: pid 22683 (pipe), uid 125: exited on signal 10
18:06:29 SRV_NAME kernel: pid 22688 (virtual), uid 125: exited on signal 10
18:07:42 SRV_NAME kernel: pid 26501 (sshd), uid 22: exited on signal 10
18:07:45 SRV_NAME kernel: pid 26497 (httpd), uid 80: exited on signal 10
18:07:45 SRV_NAME kernel: pid 26498 (httpd), uid 80: exited on signal 10
18:07:45 SRV_NAME kernel: pid 25855 (httpd), uid 80: exited on signal 10
18:07:45 SRV_NAME kernel: pid 45341 (httpd), uid 80: exited on signal 10
18:07:45 SRV_NAME kernel: pid 25854 (httpd), uid 80: exited on signal 10
18:07:45 SRV_NAME kernel: pid 26496 (httpd), uid 80: exited on signal 10
18:07:45 SRV_NAME kernel: pid 57507 (httpd), uid 0: exited on signal 10 
(core dumped)
18:08:10 SRV_NAME kernel: pid 22680 (smtpd), uid 125: exited on signal 10
18:08:17 SRV_NAME kernel: pid 22682 (cleanup), uid 125: exited on signal 10
18:09:30 SRV_NAME kernel: pid 21292 (pickup), uid 125: exited on signal 10
18:09:49 SRV_NAME kernel: pid 6795 (webalizer), uid 0: exited on signal 
10 (core dumped)
18:09:49 SRV_NAME kernel: pid 6656 (postdrop), uid 0: exited on signal 10
18:09:49 SRV_NAME kernel: pid 6649 (sendmail), uid 0: exited on signal 
10 (core dumped)
18:13:09 SRV_NAME kernel: pid 22394 (trivial-rewrite), uid 125: exited 
on signal 10
18:16:53 SRV_NAME kernel: pid 26503 (sshd), uid 9001: exited on signal 10
18:16:53 SRV_NAME kernel: pid 26500 (sshd), uid 0: exited on signal 10
23:02:04 SRV_NAME kernel: pid 22478 (smtpd), uid 125: exited on signal 10
06:43:46 SRV_NAME kernel: pid 22393 (anvil), uid 125: exited on signal 10
SRV_NAME kernel: pid 22043 (sshd), uid 22: exited on signal 10
SRV_NAME kernel: pid 74788 (tlsmgr), uid 125: exited on signal 10
SRV_NAME kernel: pid 78093 (qmgr), uid 125: exited on signal 10
SRV_NAME kernel: pid 75084 (verify), uid 125: exited on signal 10
SRV_NAME kernel: pid 22045 (sshd), uid 9001: exited on signal 10
SRV_NAME kernel: pid 22042 (sshd), uid 0: exited on signal 10
SRV_NAME kernel: pid 24432 (sshd), uid 22: exited on signal 10
SRV_NAME kernel: pid 24434 (sshd), uid 9001: exited on signal 10
SRV_NAME kernel: pid 24431 (sshd), uid 0: exited on signal 10

I'm running a SMP system, apache is 1.3.33, postfix is 2.2.3_1,1

Could this be a sign of bad hardware ?