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fedora 6 went end-of-life december 2007 so any kernel issues you are experiencing may have been fixed in a more recent kernel release

Fedora Core 6 End of Life
https://www.redhat.com/archives/fedora-announce-list/2007-November/msg00000.html

you could try running a memory check and receding memory modules...

http://www.memtest86.com/

...though if that doesn't work it's probably time to get off that fedora version
fedora 20 is the latest; life cycle is much shorter than regular distributions

http://fedoraproject.org/en/get-fedora

re-install the latest linux distribution again

Duncan

All log.

kernel: BUG: unable to handle kernel paging request at virtual address 00200200
kernel:  printing eip:
kernel: c04e5541
kernel: *pde = 7bcd3067
kernel: Oops: 0000 [#1]
kernel: SMP
kernel: last sysfs file: /class/net/lo/type
kernel: Modules linked in: ipip af_key ip_conntrack_ftp ip_conntrack_netbios_ns ipt_MASQUERADE iptable_nat ip_nat xt_state ip_conntrack nfnetlink iptable_filter ip_tables xfrm4_mode_tunnel deflate zlib_deflate twofish serpent blowfish sha256 crypto_null aes des md5 tunnel4 ipcomp esp4 ah4 xt_tcpudp xt_multiport x_tables dm_multipath video sbs i2c_ec button battery ac parport_pc lp parport joydev sg intel_rng pcspkr tg3(U) ide_cd i2c_i801 i2c_core cdrom bnx2 dm_snapshot dm_zero dm_mirror dm_mod aacraid sd_mod scsi_mod ext3 jbd ehci_hcd ohci_hcd uhci_hcd
kernel: CPU:    0
kernel: EIP:    0060:[<c04e5541>]    Not tainted VLI
kernel: EFLAGS: 00010292   (2.6.18-1.2798.fc6 #1)
kernel: EIP is at list_del+0x9/0x6c
kernel: eax: 00200200   ebx: eb0e8798   ecx: 00000000   edx: 00000000
kernel: esi: eb0e8748   edi: f7db2ac0   ebp: 00000282   esp: f7feff38
kernel: ds: 007b   es: 007b   ss: 0068
kernel: Process events/0 (pid: 8, ti=f7fef000 task=f7d205e0 task.ti=f7fef000)
kernel: Stack: c6cefae4 00000000 c6cefac0 eb0e8740 c04b77ae eb0e8740 eb0e8748 f7db2ac0
kernel:        c04b73f4 c067ece0 c067ece4 c042fa48 00000246 f7db2ac0 f7db2ae0 c04b733d
kernel:        00000000 f7db2ae0 f7db2ac0 f7db2ad8 00000000 c0430340 00000001 00000000
kernel: Call Trace:
kernel:  [<c04b77ae>] keyring_destroy+0x28/0x65
kernel:  [<c04b73f4>] key_cleanup+0xb7/0xd0
kernel:  [<c042fa48>] run_workqueue+0x83/0xc5
kernel:  [<c0430340>] worker_thread+0xd9/0x10d
kernel:  [<c0432807>] kthread+0xc0/0xed
kernel:  [<c0405447>] kernel_thread_helper+0x7/0x10
kernel: DWARF2 unwinder stuck at kernel_thread_helper+0x7/0x10
kernel: Leftover inexact backtrace:
kernel:  =======================
kernel: Code: 8d 46 04 e8 86 00 00 00 8d 4b 0c 8b 51 04 8d 46 0c 83 c4 14 5b 5e 5f e9 72 00 00 00 89 c3 eb e8 90 90 53 89 c3 83 ec 0c 8b 40 04 <8b> 00 39 d8 74 1c 89 5c 24 04 89 44 24 08 c7 04 24 cc 6f 63 c0
kernel: EIP: [<c04e5541>] list_del+0x9/0x6c SS:ESP 0068:f7feff38
kernel:  <3>BUG: soft lockup detected on CPU#0!
kernel:  [<c0405876>] dump_trace+0x69/0x1af
kernel:  [<c04059d4>] show_trace_log_lvl+0x18/0x2c
kernel:  [<c0405f83>] show_trace+0xf/0x11
kernel:  [<c0406080>] dump_stack+0x15/0x17
kernel:  [<c04497ed>] softlockup_tick+0xad/0xc4
kernel:  [<c042a3b5>] update_process_times+0x39/0x5c
kernel:  [<c04148c5>] smp_apic_timer_interrupt+0x5b/0x62
kernel:  [<c040512f>] apic_timer_interrupt+0x1f/0x30
kernel: DWARF2 unwinder stuck at apic_timer_interrupt+0x1f/0x30
kernel: Leftover inexact backtrace:
kernel:  [<c0609947>] __write_lock_failed+0xf/0x20
kernel:  [<c04e5441>] _raw_write_lock+0x5d/0x74
kernel:  [<c04b7cc5>] keyring_publish_name+0x2c/0x6d
kernel:  [<c04b7d14>] keyring_instantiate+0xe/0x13
kernel:  [<c04b6c6c>] __key_instantiate_and_link+0x2f/0xa8
kernel:  [<c04b7ed5>] keyring_alloc+0x53/0x6a
kernel:  [<c04b9550>] alloc_uid_keyring+0x4c/0xb2
kernel:  [<c042a82d>] alloc_uid+0x95/0x13c
kernel:  [<c042d68f>] set_user+0xb/0x8e
kernel:  [<c042ed81>] sys_setuid+0x7a/0x134
kernel:  [<c0404027>] syscall_call+0x7/0xb
kernel:  =======================