osx - OS X Server 10.6.8 keeps crashing -

i have os x server 10.4 started kernel panicking on me late december. had mail, web , sql services turned on.
switched mac, problem persisted. updated 10.6.8, no difference. switched third mac, no difference.
in short; gets 1-3 kernel panics per day.

i have noticed cpu load rises until panics.

so during weekend turned off services except mail. worked during weekend. today 1500 (15pm) turned on web services, , after cpu load started rise...

among processes found more 300 perl processes owned _www user. clamavd (owned amisvd if remember correctly) eating lot of memory.

clamavd anti virus , spam processes, right? have tried turn them off in os x server admin app. won't turn off. regarding perl processes don't know used. info panel doesn't give me idea. think means 1 of sites (i have 20) using perl, don't know one.

so, questions:
- safe upgrade os x el capitan server? should i?
- how can kill perl processes @ 1 time? (i have googled couldn't find working tips)
- idea of what's going on?

as may tell i'm not skilled apache, still think it's funny , educating this.

graph
perl processes

how can kill perl processes @ 1 time? killall available on os x. try

killall -9 perl 

hth

btw - apologies thissuitisblacknot -- see referred in comments.