my system is hanged today and i needed to restart it. then found this loop like memory problem in logs.

Jun 25 16:45:17 ccdrive kernel: CPU: 0
Jun 25 16:45:17 ccdrive kernel: EIP: 0060:[<c01266f9>] Not tainted
Jun 25 16:45:18 ccdrive kernel: EFLAGS: 00010202
Jun 25 16:45:18 ccdrive kernel:
Jun 25 16:45:18 ccdrive kernel: EIP is at free_uid [kernel] 0x29 (2.4.22-1.2199.nptl)
Jun 25 16:45:18 ccdrive kernel: eax: 00000000 ebx: c033f7bc ecx: c033f7c8 edx: 00000000
Jun 25 16:45:18 ccdrive kernel: esi: 00000234 edi: 00000000 ebp: 00000234 esp: f0487f84
Jun 25 16:45:18 ccdrive kernel: ds: 0068 es: 0068 ss: 0068
Jun 25 16:45:18 ccdrive kernel: Process procmail (pid: 22406, stackpage=f0487000)
Jun 25 16:45:19 ccdrive kernel: Stack: 00000000 00000234 f0486000 c012a288 c033f7bc 00000000 00000000 c012a367
Jun 25 16:45:20 ccdrive kernel: 00000234 00000000 00000000 f0486000 0805827e 00000002 bfed0458 c0109747
Jun 25 16:45:21 ccdrive kernel: 00000234 ffffffff 00825238 0805827e 00000002 bfed0458 000000cb 0000002b
Jun 25 16:45:22 ccdrive kernel: Call Trace: [<c012a288>] set_user [kernel] 0x58 (0xf0487f90)
Jun 25 16:45:22 ccdrive kernel: [<c012a367>] sys_setreuid [kernel] 0xc7 (0xf0487fa0)
Jun 25 16:45:23 ccdrive kernel: [<c0109747>] system_call [kernel] 0x33 (0xf0487fc0)
Jun 25 16:45:23 ccdrive kernel:
Jun 25 16:45:23 ccdrive kernel:
Jun 25 16:45:23 ccdrive kernel: Code: 89 50 04 89 02 c7 41 04 00 00 00 00 c7 43 0c 00 00 00 00 a1
Jun 25 16:45:33 ccdrive kernel: <1>Unable to handle kernel NULL pointer dereference at virtual address 00000004
Jun 25 16:45:33 ccdrive kernel: printing eip:
Jun 25 16:45:33 ccdrive kernel: c01266f9
Jun 25 16:45:33 ccdrive kernel: *pde = 2cdc9067
Jun 25 16:45:33 ccdrive kernel: *pte = 00000000
Jun 25 16:45:33 ccdrive kernel: Oops: 0002
Jun 25 16:45:33 ccdrive kernel: iptable_filter ip_tables sis900 microcode keybdev mousedev hid input ehci-hcd usb-ohci usbcore ext3 jbd raid1



is it a hardwar issue or anything wrong in my applications. and how to solve it. (replace RAM or Harddisk)