Additional info:
kernel BUG at fs/buffer.c:3270!
invalid opcode: 0000 [#1] SMP 
Modules linked in: vfat fat usb_storage hidp ipt_MASQUERADE nf_conntrack_netbios_ns nf_conntrack_broadcast ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 iptable_nat nf_nat_ipv4 nf_nat iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ebtable_filter ebtables ip6table_filter be2iscsi ip6_tables iscsi_boot_sysfs bnx2i cnic uio cxgb4i cxgb4 cxgb3i cxgb3 mdio libcxgbi ib_iser rdma_cm ib_addr iw_cm ib_cm ib_sa ib_mad ib_core iscsi_tcp libiscsi_tcp rfcomm bnep libiscsi scsi_transport_iscsi snd_hda_codec_hdmi snd_hda_codec_realtek btusb arc4 snd_hda_intel snd_usb_audio snd_usbmidi_lib iwldvm mac80211 snd_hda_codec snd_hwdep bluetooth iwlwifi snd_rawmidi snd_seq snd_seq_device uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core snd_pcm cfg80211 tpm_tis iTCO_wdt iTCO_vendor_support mei lpc_ich thinkpad_acpi videodev media snd_page_alloc snd_timer snd coretemp mfd_core i2c_i801 kvm soundcore tpm rfkill tpm_bios joydev microcode uinput dm_crypt crc32c_intel ghash_clmulni_intel i915 sdhci_pci sdhci i2c_algo_bit drm_kms_helper mmc_core e1000e drm i2c_core wmi video sunrpc
CPU 2 
Pid: 63, comm: kswapd0 Not tainted 3.8.3-203.fc18.x86_64 #1 LENOVO 23444AG/23444AG
RIP: 0010:[<ffffffff811ce376>]  [<ffffffff811ce376>] free_buffer_head+0x46/0x50
RSP: 0018:ffff880401cc39c0  EFLAGS: 00010287
RAX: ffff88008bad0388 RBX: ffff88008bad02d8 RCX: 0000000180270022
RDX: 0000000180270023 RSI: 0000000080270022 RDI: ffff88008bad0340
RBP: ffff880401cc39f8 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8803b5c01c50
R13: 0000000000000001 R14: ffff880401cc3aa0 R15: ffffea000210e620
FS:  0000000000000000(0000) GS:ffff88041e280000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6d17e79000 CR3: 0000000001c0c000 CR4: 00000000001407e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process kswapd0 (pid: 63, threadinfo ffff880401cc2000, task ffff880401cbdd80)
Stack:
 ffffffff811ce3f9 ffffea000210e5c0 ffff88008bad0410 ffff880401cc3a08
 ffff880401cc3d90 ffff880401cc3b98 ffffea000210e600 ffff880401cc3a08
 ffffffff81132125 ffff880401cc3b18 ffffffff8114616f ffff880401cc3ac8
Call Trace:
 [<ffffffff811ce3f9>] ? try_to_free_buffers+0x79/0xb0
 [<ffffffff81132125>] try_to_release_page+0x45/0x50
 [<ffffffff8114616f>] shrink_page_list+0x61f/0xa90
 [<ffffffff81146be7>] shrink_inactive_list+0x157/0x410
 [<ffffffff81147601>] shrink_lruvec+0x401/0x5f0
 [<ffffffff81147865>] shrink_zone+0x75/0xa0
 [<ffffffff81148a34>] balance_pgdat+0x484/0x6f0
 [<ffffffff81148e14>] kswapd+0x174/0x440
 [<ffffffff810828c0>] ? wake_up_bit+0x40/0x40
 [<ffffffff81148ca0>] ? balance_pgdat+0x6f0/0x6f0
 [<ffffffff81081fb0>] kthread+0xc0/0xd0
 [<ffffffff81010000>] ? ftrace_define_fields_xen_mc_entry+0xa0/0xf0
 [<ffffffff81081ef0>] ? kthread_create_on_node+0x120/0x120
 [<ffffffff816585ec>] ret_from_fork+0x7c/0xb0
 [<ffffffff81081ef0>] ? kthread_create_on_node+0x120/0x120
Code: 89 e5 e8 1e 63 fb ff 65 ff 0c 25 60 0a 01 00 b8 01 00 00 00 65 0f c1 04 25 64 0a 01 00 3d ff 0f 00 00 7e 05 e8 3c f4 ff ff 5d c3 <0f> 0b 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 55 
RIP  [<ffffffff811ce376>] free_buffer_head+0x46/0x50
 RSP <ffff880401cc39c0>