warning at net/mac80211/driver-ops.h:647 ieee80211_sta_wmm_params

Yesterday I got this warning for the first time while using WLAN in a train, I'm unsure if this warning is worth to be reported or not :

Dec 26 20:26:48 t44 kernel: [45827.647635] cfg80211:   (5490000 KHz - 5710000 KHz @ 160000 KHz), (N/A, 2700 mBm), (0 s)
Dec 26 20:26:48 t44 kernel: [45827.647637] cfg80211:   (57000000 KHz - 66000000 KHz @ 2160000 KHz), (N/A, 4000 mBm), (N/A)
Dec 26 20:26:48 t44 kernel: [45827.700734] ------------[ cut here ]------------
Dec 26 20:26:48 t44 kernel: [45827.700762] WARNING: CPU: 0 PID: 1498 at net/mac80211/driver-ops.h:647 ieee80211_sta_wmm_params+0x3f7/0x410 [mac80211]()
Dec 26 20:26:48 t44 kernel: [45827.700764] wlp3s0: invalid CW_min/CW_max: 127/3
Dec 26 20:26:48 t44 kernel: [45827.700766] Modules linked in: nls_iso8859_1 nls_cp437 vfat fat mmc_block nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables ipt_MASQUERADE nf_nat_masquerade_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_limit ipt_REJECT nf_reject_ipv4 xt_recent xt_tcpudp xt_conntrack iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_filter ip_tables x_tables nfsd auth_rpcgss oid_registry lockd grace ctr ccm sunrpc af_packet bridge stp llc tun uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev arc4 coretemp x86_pkg_temp_thermal kvm_intel kvm rtsx_pci_sdmmc mmc_core evdev jitterentropy_rng hmac drbg aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd psmouse pcspkr atkbd i915 fbcon bitblit i2c_algo_bit softcursor font i2c_i801 iwlmvm snd_hda_codec_generic drm_kms_helper mac80211 cfbfillrect syscopyarea tpm_tis cfbimgblt tpm sysfillrect sysimgblt iwlwifi fb_sys_fops cfbcopyarea drm cfg80211 
i2c_core xhci_pci snd_hda_intel thinkpad_acpi snd_hda_codec nvram ehci_pci hwmon battery intel_gtt snd_hda_core ehci_hcd xhci_hcd rtsx_pci ac agpgart rfkill e1000e video snd_pcm fb fbdev snd_timer lpc_ich usbcore snd mfd_core usb_common soundcore thermal wmi button processor
Dec 26 20:26:48 t44 kernel: [45827.700893] CPU: 0 PID: 1498 Comm: kworker/u8:67 Tainted: G        W       4.3.3-hardened-r2 #1
Dec 26 20:26:48 t44 kernel: [45827.700894] Hardware name: LENOVO 20AQCTO1WW/20AQCTO1WW, BIOS GJET83WW (2.33 ) 03/09/2015
Dec 26 20:26:48 t44 kernel: [45827.700898] Workqueue: phy0 ffffffffc03fdc10
Dec 26 20:26:48 t44 kernel: [45827.700901]  ffffffff81a0584b 0000000000000000 ffffffffc04556dc ffffc9000768b898
Dec 26 20:26:48 t44 kernel: [45827.700904]  ffffffff8138014d ffffc9000768b8e0 ffffc9000768b8d0 ffffffff81061b16
Dec 26 20:26:48 t44 kernel: [45827.700908]  ffffffffc04556dc 0000000000000287 ffffffffc0451ab0 ffff88032c5b0c18
Dec 26 20:26:48 t44 kernel: [45827.700911] Call Trace:
Dec 26 20:26:48 t44 kernel: [45827.700929]  [<ffffffffc04556dc>] ? minstrel_mcs_groups+0xc15c/0xc7b6 [mac80211]
Dec 26 20:26:48 t44 kernel: [45827.700934]  [<ffffffff8138014d>] dump_stack+0x44/0x67
Dec 26 20:26:48 t44 kernel: [45827.700938]  [<ffffffff81061b16>] warn_slowpath_common+0x86/0xc0
Dec 26 20:26:48 t44 kernel: [45827.700950]  [<ffffffffc04556dc>] ? minstrel_mcs_groups+0xc15c/0xc7b6 [mac80211]
Dec 26 20:26:48 t44 kernel: [45827.700961]  [<ffffffffc0451ab0>] ? minstrel_mcs_groups+0x8530/0xc7b6 [mac80211]
Dec 26 20:26:48 t44 kernel: [45827.700965]  [<ffffffff81061bb0>] warn_slowpath_fmt+0x60/0x80
Dec 26 20:26:48 t44 kernel: [45827.700976]  [<ffffffffc0451ab0>] ? minstrel_mcs_groups+0x8530/0xc7b6 [mac80211]
Dec 26 20:26:48 t44 kernel: [45827.700992]  [<ffffffffc0435be4>] ? ieee80211_sta_process_chanswitch+0xa4/0x5d0 [mac80211]
Dec 26 20:26:48 t44 kernel: [45827.701006]  [<ffffffffc0436ce7>] ieee80211_sta_wmm_params+0x3f7/0x410 [mac80211]
Dec 26 20:26:48 t44 kernel: [45827.701020]  [<ffffffffc03f32f5>] ? ieee80211_rx_bss_put+0x25/0x30 [mac80211]
Dec 26 20:26:48 t44 kernel: [45827.701034]  [<ffffffffc043881f>] ieee80211_rx_mgmt_beacon+0xa3f/0x1190 [mac80211]
Dec 26 20:26:48 t44 kernel: [45827.701038]  [<ffffffff81452d62>] ? __domain_mapping+0x202/0x3d0
Dec 26 20:26:48 t44 kernel: [45827.701042]  [<ffffffff8160cd8a>] ? _raw_spin_lock_irqsave+0x1a/0x30
Dec 26 20:26:48 t44 kernel: [45827.701056]  [<ffffffffc043a18f>] ieee80211_sta_rx_queued_mgmt+0x35f/0x760 [mac80211]
Dec 26 20:26:48 t44 kernel: [45827.701065]  [<ffffffffc04b0cb5>] ? iwl_mvm_send_cmd_pdu+0x55/0x70 [iwlmvm]
Dec 26 20:26:48 t44 kernel: [45827.701072]  [<ffffffffc04a666f>] ? iwl_mvm_mc_iface_iterator+0x8f/0xe0 [iwlmvm]
Dec 26 20:26:48 t44 kernel: [45827.701077]  [<ffffffffc04a65e0>] ? iwl_mvm_set_tx_power+0x100/0x100 [iwlmvm]
Dec 26 20:26:48 t44 kernel: [45827.701080]  [<ffffffff81386b6c>] ? rb_erase+0x5ac/0x610
Dec 26 20:26:48 t44 kernel: [45827.701094]  [<ffffffffc041ab09>] ? __iterate_interfaces+0xd9/0x150 [mac80211]
Dec 26 20:26:48 t44 kernel: [45827.701098]  [<ffffffff8109b0aa>] ? set_next_entity+0xaa/0x800
Dec 26 20:26:48 t44 kernel: [45827.701100]  [<ffffffff8109bdb5>] ? dequeue_task_fair+0x575/0x1100
Dec 26 20:26:48 t44 kernel: [45827.701114]  [<ffffffffc03fdeff>] ieee80211_iface_work+0x2ef/0x3b0 [mac80211]
Dec 26 20:26:48 t44 kernel: [45827.701117]  [<ffffffff8107f95b>] process_one_work+0x14b/0x400
Dec 26 20:26:48 t44 kernel: [45827.701121]  [<ffffffff8107ff41>] worker_thread+0x51/0x470
Dec 26 20:26:48 t44 kernel: [45827.701123]  [<ffffffff8107fef0>] ? rescuer_thread+0x2e0/0x2e0
Dec 26 20:26:48 t44 kernel: [45827.701126]  [<ffffffff810858b1>] kthread+0xf1/0x110
Dec 26 20:26:48 t44 kernel: [45827.701129]  [<ffffffff810857c0>] ? kthread_create_on_node+0x190/0x190
Dec 26 20:26:48 t44 kernel: [45827.701132]  [<ffffffff8160d96e>] ret_from_fork+0x3e/0x70
Dec 26 20:26:48 t44 kernel: [45827.701134]  [<ffffffff810857c0>] ? kthread_create_on_node+0x190/0x190
Dec 26 20:26:48 t44 kernel: [45827.701137] ---[ end trace fe948fc0d5825694 ]---
Dec 26 20:26:48 t44 kernel: [45827.701138] wlp3s0: failed to set TX queue parameters for queue 3
Dec 26 20:26:48 t44 kernel: [45827.701142] wlp3s0: Limiting TX power to 20 (20 - 0) dBm as advertised by 46:90:e8:45:8a:51
Dec 26 20:27:56 t44 kernel: [45895.138554] grsec: time set by /usr/sbin/ntpd[ntpd:1582] uid/euid:0/0 gid/egid:0/0, parent /sbin/init[init:1] uid/euid:0/0 gid/egid:0/0
Dec 26 20:54:21 t44 kernel: [47481.883125] grsec: denied resource overstep by requesting 69632 for RLIMIT_MEMLOCK against limit 65536 for /usr/lib64/thunderbird/thunderbird[thunderbird:22842] uid/euid:1000/1000 gid/egid:1000/1000, parent /usr/bin/kdeinit4[kdeinit4:2845] uid/euid:1000/1000 gid/egid:1000/1000
Dec 26 20:54:53 t44 kernel: [47514.126615] wlp3s0: deauthenticating from 46:90:e8:45:8a:51 by local choice (Reason: 3=DEAUTH_LEAVING)
Dec 26 20:54:53 t44 kernel: [47514.137712] cfg80211: World regulatory domain updated:
Dec 26 20:54:53 t44 kernel: [47514.137715] cfg80211:  DFS Master region: unset
Dec 26 20:54:53 t44 kernel: [47514.137716] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
Dec 26 20:54:53 t44 kernel: [47514.137718] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)

Toralf, pgp: C4EACDDE 0076E94E

Hi Toralf,

Johannes is currently on vacation just like many people :) Yes, this kind of WARNING can be triggered by a bad AP and since we now know there are such APs, I think we need to not to WARN but log an error much less noisy error message instead. Usually Johannes says he dislike WARNINGs that can be triggered by an existing (faulty) environment, and that WARNINGs should catch internal kernel bugs. So this should not be a WARNING.

and just for the record : they are named "Telekom_ICE" - the AP in the (german) ICE trains ;)

Toralf, pgp: C4EACDDE 0076E94E

Definitely worth it, thanks!

Ugly. I once met a guy who worked on the train AP network, should dig up his contact info ...

In the meantime, we should catch this bug at a higher layer and do ... something. But what exactly? Use default WMM parameters like we usually do in cases like this?

johannes