G: unable to handle kernel NULL pointer dereference at 0000000000000050
IP: [<ffffffffa0fe46e7>] show_protocols+0xf7/0x130 [rc_core]
PGD a580c067 PUD a43b9067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-3/rc/rc0/protocols
CPU 0 
Modules linked in: smsdvb dvb_core rc_rc5_hauppauge_new ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder ir_nec_decoder smsusb smsmdtv rc_core nls_utf8 isofs hidp binfmt_misc vboxnetadp vboxnetflt vboxdrv nfsd lockd nfs_acl auth_rpcgss sunrpc exportfs parport_pc ppdev vesafb rfcomm ip6table_filter sco bnep ip6_tables l2cap btusb bluetooth ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state joydev nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp kvm_intel kvm arc4 nvidia(P) microcode uvcvideo videodev v4l2_compat_ioctl32 snd_hda_codec_idt iwlagn iwlcore snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device mac80211 pcmcia dell_wmi sparse_keymap dell_laptop cfg80211 snd yenta_socket pcmcia_rsrc dcdbas soundcore psmouse pcmcia_core snd_page_alloc serio_raw video lp parport usb_storage usbhid hid uas ahci firewire_ohci sdhci_pci firewire_core crc_itu_t sdhci libahci e1000e

Pid: 3987, comm: cat Tainted: P            2.6.38-10-generic #46-Ubuntu Dell Inc. Latitude E6500                  /      
RIP: 0010:[<ffffffffa0fe46e7>]  [<ffffffffa0fe46e7>] show_protocols+0xf7/0x130 [rc_core]
RSP: 0018:ffff8800a5967e38  EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffffffffa0fe8160 RCX: ffffffffa0fe45f0
RDX: ffff8800a58fb000 RSI: ffffffffa0fe8160 RDI: ffff880036f1e400
RBP: ffff8800a5967e68 R08: ffffffff816507c0 R09: 0000000000059c91
R10: 0000000000000002 R11: 0000000000000001 R12: ffff8800a58fb000
R13: 0000000000008000 R14: 0000000001d43000 R15: ffff8800ad091de0
FS:  00007fe58759a720(0000) GS:ffff8800df200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000050 CR3: 00000000a58fd000 CR4: 00000000000406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process cat (pid: 3987, threadinfo ffff8800a5966000, task ffff8800a3c8adc0)
Stack:
 0000000000000000 ffffffffa0fe8160 ffff8800a5967f48 0000000000008000
 0000000001d43000 ffff8800ad091de0 ffff8800a5967e98 ffffffff813b6df7
 ffff8800a5967e88 ffffffff8111082e ffff8800a5967e98 ffff8800ad091e00
Call Trace:
 [<ffffffff813b6df7>] dev_attr_show+0x27/0x50
 [<ffffffff8111082e>] ? __get_free_pages+0xe/0x50
 [<ffffffff811d3e93>] sysfs_read_file+0xc3/0x190
 [<ffffffff81164f93>] vfs_read+0xc3/0x180
 [<ffffffff811650a1>] sys_read+0x51/0x90
 [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b
Code: 5c 41 5d 41 5e 41 5f c9 c3 0f 1f 00 49 8b 96 e8 70 fe a0 48 c7 c6 23 72 fe a0 eb ac 0f 1f 84 00 00 00 00 00 48 8b 87 b0 02 00 00 <4c> 8b 68 50 e8 c0 19 00 00 48 89 c3 e9 3f ff ff ff 4c 89 e9 48 
RIP  [<ffffffffa0fe46e7>] show_protocols+0xf7/0x130 [rc_core]
 RSP <ffff8800a5967e38>
CR2: 0000000000000050
---[ end trace 38f110c6d33fc22d ]---