BUG: unable to handle kernel paging request at ffffffffffffffb8
IP: [<ffffffffa05a5839>] nfs_have_delegation+0x9/0x40 [nfs]
PGD 1c07067 PUD 1c08067 PMD 0 
Oops: 0000 [#1] SMP 
CPU 0 
Modules linked in: pci_stub vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) bnep rfcomm autofs4 bluetooth binfmt_misc nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc lp snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event ppdev snd_seq edac_core parport_pc parport sp5100_tco edac_mce_amd i2c_piix4 k10temp snd_timer snd_seq_device mac_hid wmi snd fglrx(P) psmouse serio_raw soundcore snd_page_alloc firewire_ohci firewire_core usbhid hid crc_itu_t pata_atiixp r8169

Pid: 2647, comm: pidgin Tainted: P           O 3.2.0-22-generic #35-Ubuntu Gigabyte Technology Co., Ltd. GA-MA78GM-US2H/GA-MA78GM-US2H
RIP: 0010:[<ffffffffa05a5839>]  [<ffffffffa05a5839>] nfs_have_delegation+0x9/0x40 [nfs]
RSP: 0018:ffff8801268e9de8  EFLAGS: 00010246
RAX: 00000000ffffd8ca RBX: 00000000ffffd8ca RCX: 000000018010000e
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8801268e9de8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff880125c5f000
R13: ffff8801268e9e68 R14: ffff880127a193c0 R15: ffff880124916400
FS:  00007fdf33734980(0000) GS:ffff88012fc00000(0000) knlGS:00000000f715e740
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffb8 CR3: 00000001140d6000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process pidgin (pid: 2647, threadinfo ffff8801268e8000, task ffff8801140dc4d0)
Stack:
 ffff8801268e9e38 ffffffffa0594ef1 ffff8800cf25a920 0000000000000000
 0000000000000001 ffff880127a193c0 ffff880127a190c0 0000000000000007
 ffff8801268e9e68 00000000fffffff5 ffff8801268e9eb8 ffffffffa0599378
Call Trace:
 [<ffffffffa0594ef1>] nfs4_handle_exception+0x231/0x2c0 [nfs]
 [<ffffffffa0599378>] nfs4_proc_lock+0xe8/0x200 [nfs]
 [<ffffffffa057a4ad>] do_setlk+0xed/0x110 [nfs]
 [<ffffffffa057a559>] nfs_flock+0x89/0xe0 [nfs]
 [<ffffffff811c3a63>] sys_flock+0x113/0x1c0
 [<ffffffff81664a82>] system_call_fastpath+0x16/0x1b
Code: 8b 65 e0 4c 8b 6d e8 4c 8b 75 f0 4c 8b 7d f8 c9 c3 90 55 48 89 e5 66 66 66 66 90 f0 80 4f 48 04 5d c3 55 48 89 e5 66 66 66 66 90 <48> 8b 57 b8 31 c0 48 85 d2 74 0c 8b 4a 30 83 e6 03 21 f1 39 f1 
RIP  [<ffffffffa05a5839>] nfs_have_delegation+0x9/0x40 [nfs]
 RSP <ffff8801268e9de8>
CR2: ffffffffffffffb8
---[ end trace 11530729683e394d ]---