BUG: soft lockup - CPU#0 stuck for 22s! [kswapd0:31]
Modules linked in: veth xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables joydev snd_hda_codec_conexant parport_pc ppdev snd_hda_codec_hdmi acer_wmi rfcomm bnep bluetooth snd_hda_intel kvm_amd arc4 snd_hda_codec kvm snd_hwdep snd_pcm microcode rt2800pci snd_page_alloc asix uvcvideo snd_seq_midi rt2800mmio usbnet videobuf2_vmalloc videobuf2_memops snd_seq_midi_event rt2800lib psmouse videobuf2_core rt2x00pci rts5139(C) rt2x00mmio snd_rawmidi videodev serio_raw snd_seq rt2x00lib k10temp mac80211 radeon snd_seq_device snd_timer cfg80211 eeprom_93cx6 crc_ccitt ttm snd drm_kms_helper sp5100_tco i2c_piix4 drm soundcore i2c_algo_bit ideapad_laptop sparse_keymap video wmi mac_hid lp parport r8169 mii ahci libahci
CPU: 0 PID: 31 Comm: kswapd0 Tainted: G         C   3.13.0-10-generic #30-Ubuntu
Hardware name: LENOVO 1450A7U/Inagua, BIOS 52CN11WW 05/12/2011
task: f5584100 ti: f56b6000 task.ti: f56b6000
EIP: 0060:[<c1648bb6>] EFLAGS: 00000282 CPU: 0
EIP is at _raw_spin_lock+0x16/0x50
EAX: c1b493a0 EBX: f6978000 ECX: c1b493a0 EDX: 0000f2f2
ESI: 00000000 EDI: 51eb851f EBP: f56b7e3c ESP: f56b7e34
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
CR0: 8005003b CR2: bce0d000 CR3: 01a84000 CR4: 000007f0
Stack:
 f6978000 00000000 f56b7e48 c1177655 f6978204 f56b7e64 c1178288 00000000
 f6978000 f6978204 f6978204 00000400 f56b7ec8 c112e724 f56b7e6c f56b7e6c
 f56b7e74 016b7e74 d5cbf000 f56b7e94 c116f516 00000000 00000080 000057e2
Call Trace: