Segfault is pbs_sched in next_job()

Hello All,

	In working at a customers site today, I ran into an issue where  
pbs_sched would segfault and die after a relatively short period of  
time. A large amount of jobs are in the queued and several jobs run  
nicely until pbs_sched segfaults. I was running TORQUE 2.1.8, and  
after the segfault I upgraded pbs_sched to version 2.1.9 and I still  
see the same behavior.
	According to the segfault below, it occurs in last_job++, which  
simply bumps a integer. I'm curious how simply bumping an int could  
cause a segfault. last_job is a integer offset into an array, but  
even if it was an array out of bounds error, I don't think the  
segfault would occur until the array was accessed.
	Below is a backtrace from GDB, and I've attached the core file. Its  
about 920k or so. I'd appreciate any help with this:
---SNIP---
[root@scyld sched_priv]# gdb pbs_sched core.13973
GNU gdb Red Hat Linux (6.3.0.0-1.143.el4rh)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and  
you are
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conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for  
details.
This GDB was configured as "x86_64-redhat-linux-gnu"...Using host  
libthread_db library "/lib64/tls/libthread_db.so.1".
Core was generated by `pbs_sched'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib64/libtorque.so.0...done.
Loaded symbols for /usr/lib64/libtorque.so.0
Reading symbols from /lib64/tls/libc.so.6...done.
Loaded symbols for /lib64/tls/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib64/libnss_files.so.2...done.
Loaded symbols for /lib64/libnss_files.so.2
Reading symbols from /lib64/libnss_beo.so.2...done.
Loaded symbols for /lib64/libnss_beo.so.2
Reading symbols from /usr/lib64/libbeoconfig.so.0...done.
Loaded symbols for /usr/lib64/libbeoconfig.so.0
Reading symbols from /lib64/libnss_bproc.so.2...done.
Loaded symbols for /lib64/libnss_bproc.so.2
Reading symbols from /usr/lib64/libbproc.so.2...done.
Loaded symbols for /usr/lib64/libbproc.so.2
#0  0x0000000000404cfd in next_job (sinfo=0x646c61636f6c2e64, init=0)  
at fifo.c:689
689           last_job++;
(gdb) bt
#0  0x0000000000404cfd in next_job (sinfo=0x646c61636f6c2e64, init=0)  
at fifo.c:689
#1  0x00000000004052de in scheduling_cycle (sd=1767992687) at fifo.c:432
#2  0x000000000040455d in main (argc=Variable "argc" is not available.
) at pbs_sched.c:1036
---END SNIP---

-Joshua Bernstein
Software Engineer
Penguin Computing