I regularly have blockings of my wifi (iwlwifi).
[ 484.879880] iwlwifi 0000:02:00.0: failed to update MAC 0c:8b:fd:83:ad:4c
[ 484.879890] iwlwifi 0000:02:00.0: failed to update power mode
[ 484.879942] iwlwifi 0000:02:00.0: set key failed
[ 484.879949] iwlwifi 0000:02:00.0: Failed to find station id
[ 484.879955] iwlwifi 0000:02:00.0: set key failed
[ 484.879992] iwlwifi 0000:02:00.0: Failed to send quota: -5
[ 484.879999] iwlwifi 0000:02:00.0: Failed to update quotas after restart (-5)
[ 485.533611] ------------[ cut here ]------------
[ 485.533629] WARNING: CPU: 3 PID: 3046 at /build/buildd/linux-3.11.0/drivers/net/wireless/iwlwifi/pcie/tx.c:1623 iwl_trans_pcie_tx+0x7c0/0x7e0 [iwlwifi]()
[ 485.533631] Modules linked in: dm_crypt(F) joydev(F) parport_pc(F) ppdev(F) rfcomm bnep x86_pkg_temp_thermal coretemp kvm_intel(F) kvm(F) crct10dif_pclmul(F) crc32_pclmul(F) ghash_clmulni_intel(F) aesni_intel(F) aes_x86_64(F) lrw(F) gf128mul(F) glue_helper(F) ablk_helper(F) cryptd(F) arc4(F) ip6t_REJECT(F) xt_hl(F) ip6t_rt(F) nf_conntrack_ipv6(F) nf_defrag_ipv6(F) ipt_REJECT(F) xt_LOG(F) snd_hda_codec_realtek snd_hda_codec_hdmi xt_limit(F) xt_tcpudp(F) microcode(F) xt_addrtype(F) snd_hda_intel snd_hda_codec snd_hwdep(F) nf_conntrack_ipv4(F) nf_defrag_ipv4(F) xt_conntrack(F) uvcvideo videobuf2_vmalloc videobuf2_memops snd_pcm(F) psmouse(F) videobuf2_core serio_raw(F) ip6table_filter(F) rtsx_pci_ms ip6_tables(F) videodev nf_conntrack_netbios_ns(F) nf_conntrack_broadcast(F) nf_nat_ftp(F) snd_page_alloc(F) nf_nat(F) memstick nf_conntrack_ftp(F) nf_conntrack(F) iptable_filter(F) snd_seq_midi(F) ip_tables(F) x_tables(F) snd_seq_midi_event(F) iwlmvm snd_rawmidi(F) mac80211 lpc_ich btusb bluetooth snd_seq(F) iwlwifi cfg80211 snd_seq_device(F) snd_timer(F) snd(F) mei_me mei mac_hid soundcore(F) lp(F) parport(F) hid_generic usbhid hid rtsx_pci_sdmmc i915 i2c_algo_bit drm_kms_helper r8169 ahci(F) libahci(F) mii(F) drm rtsx_pci wmi video(F)
[ 485.533669] CPU: 3 PID: 3046 Comm: Socket Thread Tainted: GF W 3.11.0-12-generic #19-Ubuntu
[ 485.533671] Hardware name: Notebook W54_55SU1,SUW/W54_55SU1,SUW, BIOS 4.6.5 09/25/2013
[ 485.533672] 0000000000000009 ffff8801d9185630 ffffffff816e547a 0000000000000000
[ 485.533674] ffff8801d9185668 ffffffff81061dbd ffff88020e766160 0000000000000002
[ 485.533676] 0000000000000018 ffff8801d88390d4 ffff8801d9322f00 ffff8801d9185678
[ 485.533678] Call Trace:
[ 485.533683] [<ffffffff816e547a>] dump_stack+0x45/0x56
[ 485.533686] [<ffffffff81061dbd>] warn_slowpath_common+0x7d/0xa0
[ 485.533688] [<ffffffff81061e9a>] warn_slowpath_null+0x1a/0x20
[ 485.533693] [<ffffffffa0298a40>] iwl_trans_pcie_tx+0x7c0/0x7e0 [iwlwifi]
[ 485.533705] [<ffffffffa03a1d14>] ? ieee80211_get_tkip_p2k+0x84/0xa0 [mac80211]
[ 485.533711] [<ffffffffa031af51>] iwl_mvm_tx_skb+0x141/0x350 [iwlmvm]
[ 485.533715] [<ffffffffa031552c>] iwl_mvm_mac_tx+0x7c/0xb0 [iwlmvm]
[ 485.533723] [<ffffffffa03ae1d5>] __ieee80211_tx+0x125/0x350 [mac80211]
[ 485.533730] [<ffffffffa03b056f>] ieee80211_tx+0xbf/0xf0 [mac80211]
[ 485.533738] [<ffffffffa03b078d>] ieee80211_xmit+0x9d/0x100 [mac80211]
[ 485.533744] [<ffffffffa03b1744>] ieee80211_subif_start_xmit+0xc24/0xd80 [mac80211]
[ 485.533747] [<ffffffff815f0a28>] dev_hard_start_xmit+0x318/0x570
[ 485.533750] [<ffffffff8160e246>] sch_direct_xmit+0xe6/0x1c0
[ 485.533751] [<ffffffff815f0e81>] dev_queue_xmit+0x201/0x4c0
[ 485.533754] [<ffffffff81627979>] ip_finish_output+0x2c9/0x3b0
[ 485.533756] [<ffffffff81628d48>] ip_output+0x58/0x90
[ 485.533758] [<ffffffff816284b5>] ip_local_out+0x25/0x30
[ 485.533760] [<ffffffff8162880c>] ip_queue_xmit+0x14c/0x3f0
[ 485.533762] [<ffffffff8163f4d9>] tcp_transmit_skb+0x479/0x8e0
[ 485.533763] [<ffffffff8163fad4>] tcp_write_xmit+0x194/0xb50
[ 485.533765] [<ffffffff816406fe>] __tcp_push_pending_frames+0x2e/0xc0
[ 485.533767] [<ffffffff81631c75>] tcp_sendmsg+0x115/0xd80
[ 485.533768] [<ffffffff816335b4>] ? tcp_recvmsg+0x754/0xe50
[ 485.533771] [<ffffffff810925b5>] ? check_preempt_curr+0x75/0xa0
[ 485.533773] [<ffffffff8165b024>] inet_sendmsg+0x64/0xb0
[ 485.533775] [<ffffffff81316817>] ? apparmor_socket_sendmsg+0x17/0x20
[ 485.533777] [<ffffffff815d7c69>] sock_sendmsg+0x99/0xd0
[ 485.533780] [<ffffffff811a91f1>] ? __sb_end_write+0x31/0x60
[ 485.533783] [<ffffffff811c086f>] ? touch_atime+0x10f/0x140
[ 485.533784] [<ffffffff815d8191>] SYSC_sendto+0x121/0x1c0
[ 485.533787] [<ffffffff811b8ba5>] ? do_vfs_ioctl+0x2e5/0x4d0
[ 485.533789] [<ffffffff811a6b97>] ? vfs_read+0xf7/0x170
[ 485.533790] [<ffffffff815d8b7e>] SyS_sendto+0xe/0x10
[ 485.533792] [<ffffffff816f521d>] system_call_fastpath+0x1a/0x1f
[ 485.533794] ---[ end trace 42b1ab9d6b5468e3 ]---
lspci
2:00.0 Network controller: Intel Corporation Wireless 7260 (rev 73)
Subsystem: Intel Corporation Wireless-N 7260
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 46
Region 0: Memory at f7d00000 (64-bit, non-prefetchable) [size=8K]
Capabilities: [c8] Power Management version 3
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Address: 00000000fee0200c Data: 41e1
Capabilities: [40] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, L1 unlimited
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset+
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr+ NoSnoop+ FLReset-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr+ TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <4us, L1 <32us
ClockPM+ Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Range B, TimeoutDis+
DevCtl2: Completion Timeout: 16ms to 55ms, TimeoutDis-
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-, Selectable De-emphasis: -6dB
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
Capabilities: [100 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
AERCap: First Error Pointer: 00, GenCap- CGenEn- ChkCap- ChkEn-
Capabilities: [140 v1] Device Serial Number 0c-8b-fd-ff-ff-83-ad-4c
Capabilities: [14c v1] Latency Tolerance Reporting
Max snoop latency: 71680ns
Max no snoop latency: 71680ns
Capabilities: [154 v1] Vendor Specific Information: ID=cafe Rev=1 Len=014 <?>
Kernel driver in use: iwlwifi
3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
and after I regularly obtain the following messages in console
[ 2477.822725] iwlwifi 0000:02:00.0: Scan failed! status 0x1 ret -5
[ 2494.174581] [UFW BLOCK] IN=eth0 OUT= MAC=01:
[ 2517.360600] [UFW BLOCK] IN=eth0 OUT= MAC=01:
[ 2536.334560] [UFW BLOCK] IN=eth0 OUT= MAC=01: