BUG: soft lockup - CPU#0 stuck for 22s! [kswapd0:31]
Modules linked in: nls_iso8859_1 cdc_acm bnep rfcomm dm_crypt bluetooth gpio_ich ppdev snd_hda_codec_hdmi snd_intel8x0 snd_hda_intel gspca_sn9c20x snd_hda_codec snd_ac97_codec gspca_main ac97_bus snd_hwdep videodev snd_pcm dcdbas snd_page_alloc snd_seq_midi snd_seq_midi_event joydev microcode snd_rawmidi snd_seq snd_seq_device snd_timer psmouse snd serio_raw soundcore lpc_ich parport_pc mac_hid lp parport hid_pl ff_memless hid_microsoft hid_generic radeon e100 i2c_algo_bit usbhid mii ttm usb_storage hid drm_kms_helper drm
CPU: 0 PID: 31 Comm: kswapd0 Tainted: G        W    3.13.0-11-generic #31-Ubuntu
Hardware name: Dell Inc.                 Dimension 4700               /0M3918, BIOS A10 01/04/2006
task: f4544e00 ti: f4708000 task.ti: f4708000
EIP: 0060:[<c1653b13>] EFLAGS: 00000246 CPU: 0
EIP is at _raw_spin_unlock+0x23/0x30
EAX: c1b573a0 EBX: f4412000 ECX: c1b573a0 EDX: 0000201e
ESI: f441203c EDI: 00000400 EBP: f4709e38 ESP: f4709e38
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
CR0: 8005003b CR2: b6193b20 CR3: 01a92000 CR4: 000007f0
Stack:
 f4709e48 c1178191 f4412204 f4709f20 f4709e64 c1178200 00000000 f4412000
 f4412204 f4412204 00000400 f4709ec8 c112e724 f4709e6c f4709e6c f4709e74
 01709e74 f4404400 f4709e94 c116f516 00000000 00000080 0000390b 00000000
Call Trace: