Server keeps crashing, kernel error

Mar 30 17:39:02 yuri kernel: ------------[ cut here ]------------
Mar 30 17:39:02 yuri kernel: kernel BUG at page_alloc.c:139!
Mar 30 17:39:02 yuri kernel: invalid operand: 0000
Mar 30 17:39:02 yuri kernel: ipt_REJECT iptable_filter ip_tables 8139too mii keybdev mousedev hid input usb-ohci usbcore ext3 jbd
Mar 30 17:39:02 yuri kernel: CPU: 0
Mar 30 17:39:02 yuri kernel: EIP: 0060:[<c013ea6d>] Not tainted
Mar 30 17:39:02 yuri kernel: EFLAGS: 00010202
Mar 30 17:39:02 yuri kernel:
Mar 30 17:39:02 yuri kernel: EIP is at __free_pages_ok [kernel] 0xdd (2.4.20-28.9)
Mar 30 17:39:02 yuri kernel: eax: 01000058 ebx: c1666c70 ecx: c1000030 edx: 367db4f4
Mar 30 17:39:02 yuri kernel: esi: 00000000 edi: 00000000 ebp: 00000000 esp: ea3ffeb4
Mar 30 17:39:02 yuri kernel: ds: 0068 es: 0068 ss: 0068
Mar 30 17:39:02 yuri kernel: Process httpd (pid: 12206, stackpage=ea3ff000)
Mar 30 17:39:02 yuri kernel: Stack: c0311000 00000002 c0310fc4 00000292 c0310d00 c1038030 c0310f4c f67db5f4
Mar 30 17:39:02 yuri kernel: f67db5f4 00100000 c1666c70 f67db5f4 00100000 1d438067 c012edcc c1666c70
Mar 30 17:39:02 yuri kernel: 0009a000 c0131437 f446db00 0809a000 f67db5f4 00000000 00000088 08400000
Mar 30 17:39:02 yuri kernel: Call Trace: [<c012edcc>] __free_pte [kernel] 0x4c (0xea3ffeec))
Mar 30 17:39:02 yuri kernel: [<c0131437>] zap_pte_range [kernel] 0x137 (0xea3ffef8))
Mar 30 17:39:02 yuri kernel: [<c012f43b>] zap_page_range [kernel] 0xcb (0xea3fff20))
Mar 30 17:39:02 yuri kernel: [<c01329cf>] exit_mmap [kernel] 0xaf (0xea3fff60))
Mar 30 17:39:02 yuri kernel: [<c011a42a>] mmput [kernel] 0x4a (0xea3fff84))
Mar 30 17:39:02 yuri kernel: [<c011f911>] do_exit [kernel] 0xf1 (0xea3fff94))
Mar 30 17:39:02 yuri kernel: [<c011fbb4>] do_group_exit [kernel] 0x54 (0xea3fffb0))
Mar 30 17:39:02 yuri kernel: [<c010953f>] system_call [kernel] 0x33 (0xea3fffc0))
Mar 30 17:39:02 yuri kernel:
Mar 30 17:39:02 yuri kernel:
Mar 30 17:39:02 yuri kernel: Code: 0f 0b 8b 00 d7 1c 26 c0 b8 02 00 00 00 0f b3 43 18 b8 04 00
Mar 30 17:47:13 yuri kernel: <2>Page has mapping still set. This is a serious situation. However if you
Mar 30 17:47:13 yuri kernel: are using the NVidia binary only module please report this bug to
Mar 30 17:47:13 yuri kernel: NVidia and not to the linux kernel mailinglist.
Mar 30 17:47:13 yuri kernel: ------------[ cut here ]------------
Mar 30 17:47:13 yuri kernel: kernel BUG at page_alloc.c:122!
Mar 30 17:47:13 yuri kernel: invalid operand: 0000
Mar 30 17:47:13 yuri kernel: ipt_REJECT iptable_filter ip_tables 8139too mii keybdev mousedev hid input usb-ohci usbcore ext3 jbd
Mar 30 17:47:13 yuri kernel: CPU: 0
Mar 30 17:47:13 yuri kernel: EIP: 0060:[<c013ecc3>] Not tainted
Mar 30 17:47:13 yuri kernel: EFLAGS: 00010282
Mar 30 17:47:13 yuri kernel:
Mar 30 17:47:13 yuri kernel: EIP is at __free_pages_ok [kernel] 0x333 (2.4.20-28.9)
Mar 30 17:47:13 yuri kernel: eax: 00000033 ebx: c1d66c70 ecx: 00000001 edx: c3408000
Mar 30 17:47:13 yuri kernel: esi: f675ad28 edi: 00000000 ebp: 00000000 esp: f7fc7f5c
Mar 30 17:47:13 yuri kernel: ds: 0068 es: 0068 ss: 0068
Mar 30 17:47:13 yuri kernel: Process kswapd (pid: 5, stackpage=f7fc7000)
Mar 30 17:47:13 yuri kernel: Stack: c02624a0 0000001e c0144454 c36a3bf8 c1d66c70 c1d66c70 c1d66c8c 00000001
Mar 30 17:47:13 yuri kernel: c013b360 c1d66c70 c1d66c8c c1d66c70 000001d0 00000001 c013c1a8 c1c5ae08
Mar 30 17:47:13 yuri kernel: 000001d0 00000001 0000000a c0311000 00000035 c0311234 c013d2bc c0311000
Mar 30 17:47:13 yuri kernel: Call Trace: [<c0144454>] __pte_chain_free [kernel] 0x24 (0xf7fc7f64))
Mar 30 17:47:13 yuri kernel: [<c013b360>] activate_page_nolock [kernel] 0x190 (0xf7fc7f7c))
Mar 30 17:47:13 yuri kernel: [<c013c1a8>] launder_page [kernel] 0x368 (0xf7fc7f94))
Mar 30 17:47:13 yuri kernel: [<c013d2bc>] rebalance_dirty_zone [kernel] 0x5c (0xf7fc7fb4))
Mar 30 17:47:13 yuri kernel: [<c013d8ec>] kswapd [kernel] 0x15c (0xf7fc7fd4))
Mar 30 17:47:13 yuri kernel: [<c013d790>] kswapd [kernel] 0x0 (0xf7fc7fe4))
Mar 30 17:47:13 yuri kernel: [<c010742d>] kernel_thread_helper [kernel] 0x5 (0xf7fc7ff0))
Mar 30 17:47:13 yuri kernel:
Mar 30 17:47:13 yuri kernel:
Mar 30 17:47:13 yuri kernel: Code: 0f 0b 7a 00 d7 1c 26 c0 e9 0b fd ff ff 0f 0b 69 00 d7 1c 26

Mar 30 23:45:32 yuri kernel: <1>Unable to handle kernel NULL pointer dereference at virtual address 00000074
Mar 30 23:45:32 yuri kernel: printing eip:
Mar 30 23:45:32 yuri kernel: c0144543
Mar 30 23:45:32 yuri kernel: *pde = 00000000
Mar 30 23:45:32 yuri kernel: Oops: 0000
Mar 30 23:45:32 yuri kernel: ipt_REJECT iptable_filter ip_tables 8139too mii keybdev mousedev hid input usb-ohci usbcore ext3 jbd
Mar 30 23:45:32 yuri kernel: CPU: 0
Mar 30 23:45:32 yuri kernel: EIP: 0060:[<c0144543>] Not tainted
Mar 30 23:45:32 yuri kernel: EFLAGS: 00010206
Mar 30 23:45:32 yuri kernel:
Mar 30 23:45:32 yuri kernel: EIP is at page_referenced [kernel] 0xe3 (2.4.20-28.9)
Mar 30 23:45:32 yuri kernel: eax: c17830e8 ebx: 000008fc ecx: 00000000 edx: 000f0617
Mar 30 23:45:32 yuri kernel: esi: 00000001 edi: c15f6c70 ebp: 0000443b esp: f7fc7f74
Mar 30 23:45:32 yuri kernel: ds: 0068 es: 0068 ss: 0068
Mar 30 23:45:32 yuri kernel: Process kswapd (pid: 5, stackpage=f7fc7000)
Mar 30 23:45:32 yuri kernel: Stack: f6128900 00000000 00000001 f7fc7fc0 c15f6c70 c15f6c8c 00000001 c15f6c70
Mar 30 23:45:32 yuri kernel: 0000443b c013c870 f7fc7fbc c013db48 c0310eb4 c0310e34 0000002a fffffffe
Mar 30 23:45:32 yuri kernel: 00000008 00000016 00000a41 00000001 f7fc6000 c0310d00 f7fc6305 00000000
Mar 30 23:45:32 yuri kernel: Call Trace: [<c013c870>] refill_inactive_zone [kernel] 0x430 (0xf7fc7f98))
Mar 30 23:45:32 yuri kernel: [<c013db48>] wakeup_memwaiters [kernel] 0xd8 (0xf7fc7fa0))
Mar 30 23:45:32 yuri kernel: [<c013d87c>] kswapd [kernel] 0xec (0xf7fc7fd4))
Mar 30 23:45:32 yuri kernel: [<c013d790>] kswapd [kernel] 0x0 (0xf7fc7fe4))
Mar 30 23:45:32 yuri kernel: [<c010742d>] kernel_thread_helper [kernel] 0x5 (0xf7fc7ff0))
Mar 30 23:45:32 yuri kernel:
Mar 30 23:45:32 yuri kernel:
Mar 30 23:45:32 yuri kernel: Code: 8b 41 74 39 41 60 b8 01 00 00 00 0f 43 44 24 04 89 44 24 04
Mar 31 00:15:31 yuri syslogd 1.4.1: restart.