I installed this rpm upgrade on my 4.2 box, and restarted
the crond daemon.  Soon afterwards, zombie crond processes
began appearing, roughly 1 per minute:

root       724  0.0  1.3   896   408  ?  S    11:02   0:00
crond
root       733  0.0  0.0     0     0  ?  Z    11:04   0:00
(crond <zombie>)
root       734  0.0  0.0     0     0  ?  Z    11:04   0:00
(crond <zombie>)
root       832  0.0  0.0     0     0  ?  Z    11:05   0:00
(crond <zombie>)

Eventually, the number of processes increases to the point
where no more processes can be started, and the system
becomes unusable.

I regressed to the version of vixie-cron that shipped
with the system and things are fine now.  I have
repeated this bug several times on this box.  It is
running kernel 2.0.36, and I have kept up with all pertinent
RH upgrades from the errata page.

Thanks for investigating this,

Kevin Tyle
MESO, Inc.