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cannot set user id: Resource temporarily unavailable (not open file/open process related)

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Operating Systems Linux Red Hat cannot set user id: Resource temporarily unavailable (not open file/open process related)
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cannot set user id: Resource temporarily unavailable (not open file/open process related)

First post, sorry to be a bother but this one has been dogging me. I have a process user (java application server) that trips a resource limit every couple weeks and need help finding what limit we're hitting.

First, this is what's running:

cat /etc/redhat-release
Enterprise Linux Enterprise Linux Server release 5.2 (Carthage)

uname -a
Linux host 2.6.18- #1 SMP Tue Jun 30 23:08:49 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
This is the error when jobs are run or the administrator tries to log in:
cannot set user id: Resource temporarily unavailable
I've checked the usual suspects:

# ps -eLf | grep seejcaps | wc -l
# lsof | grep seejcaps | wc -l
Here is what the user has for limits:

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) 64
max memory size (kbytes, -m) unlimited
open files (-n) 65536
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 15360
cpu time (seconds, -t) unlimited
max user processes (-u) 16384
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
I've set syslog to trap *.kernel and *.* and this is all I get when trying to SU:

Apr 26 09:35:29 host su: pam_unix(su-l:session): session opened for user seejcaps by katahdin(uid=0)
Apr 26 09:35:29 host su: pam_unix(su-l:session): session closed for user seejcaps
Any ideas on where else to look or trap what limit is being tripped?

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