That was it. The values are too small. Thanks, you all are great. So now I'm using:

MX_MAX_RSS=100000   # 100MB
MX_MAX_AS=250000    # 250MB

Can anyone recommend some values for these on a new SMP 64bit server with about 6GB of memory and 8GB of swap? I don't know what to put here now. Maybe leave it unlimited?

uname: Linux central 3.10.18 #11 SMP Wed Dec 4 22:07:20 EST 2013 x86_64 Intel(R) Xeon(R) CPU E5520 @ 2.27GHz GenuineIntel GNU/Linux

ulimit -a gives:
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 16038
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 16038
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited


On 12/6/2013 11:43 AM, David F. Skoll wrote:
On Fri, 06 Dec 2013 09:46:13 -0500

The values you specify must be too low, then.  If it fails when
you *don't* specify resource limits, maybe the default limits are
too low --- check the output of ulimit -a
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