fork: Resource temporarily unavailable / cant start new threads

From: mark
Date: Tue May 20 2008 - 14:27:01 EST

I upgraded to fedora core 9, now I get this
error when I try to login to the box, kill a pr start a python app, or
do anything on a regular basis.

fork: Resource temporarily unavailable

I have over 10GB RAM free, and zero swap spaced used. The box is a
dual quad core Intel Xeon 5405 with 16GB RAM.

There is no error message in /var/log/messages or dmesg ...
how do I identify the problem?

uname -a
Linux XXX #1 SMP Tue May 13 04:54:47 EDT 2008
x86_64 x86_64 x86_64 GNU/Linux

free -m
total used free shared buffers cached
Mem: 16086 3189 12896 0 42 666
-/+ buffers/cache: 2481 13605
Swap: 1983 0 1983

have only 505 processes running
ps aux | wc -l

11:24:15 up 39 min, 1 user, load average: 3.54, 3.47, 2.87

ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 137216
max locked memory (kbytes, -l) 32
max memory size (kbytes, -m) unlimited
open files (-n) 32768
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 1024
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
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