program hangs after calling exit

Hello,

I posted this question on gnu.gcc.help and was asked to try here. I
have included more information based on advice on that group.

I have a program that uses Check Point's OPSEC SDK. I had two instances
of the program running. The programs exit when they detect that a
certain file is not locked. I traced test lock. After running them
overnight, I removed the lock on this file and both processes detected
this and attempted to exit but continued to hang. I used top and saw
that the State was R and that the programs continued to consume CPU
time.

Here is the output of "thread apply all where" after attaching gdb to
process 1:

Thread 1 (Thread -1218497376 (LWP 27039)):
#0 0x00eb7bc6 in _IO_flush_all_lockp () from /lib/tls/libc.so.6
#1 0x00eb7f20 in _IO_cleanup () from /lib/tls/libc.so.6
#2 0x00e74702 in exit () from /lib/tls/libc.so.6
#3 0x00e5f7ff in __libc_start_main () from /lib/tls/libc.so.6
#4 0x08050c21 in _start ()

Here is the output of "thread apply all where" after attaching gdb to
process 2:
Thread 1 (Thread -1218501472 (LWP 28306)):
#0 0x00b47c2e in _IO_flush_all_lockp () from /lib/tls/libc.so.6
#1 0x00b47f20 in _IO_cleanup () from /lib/tls/libc.so.6
#2 0x00b04702 in exit () from /lib/tls/libc.so.6
#3 0x00aef7ff in __libc_start_main () from /lib/tls/libc.so.6
#4 0x08050c21 in _start ()

I ran these programs on RedHat Enterprise Linux 3.0 kernel 2.4.21-20. I
am not sure why these processes are hanging after calling exit. This
does not happen all the time - only after running these programs for a
long time.

I would appreciate any help in this matter.

Thanks

.

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