On Wed, Sep 26, 2012 at 01:47:18PM +0100, Pedro Francisco wrote: > On Thu, Aug 30, 2012 at 4:58 PM, Pedro Francisco > <pedrogfrancisco@xxxxxxxxx> wrote: > > On Tue, Aug 7, 2012 at 11:22 AM, Stanislaw Gruszka <sgruszka@xxxxxxxxxx> wrote: > >> On Tue, Jul 31, 2012 at 01:54:52PM +0100, Pedro Francisco wrote: > >>> I've noticed in the past few days a pattern: sometimes nm-applet > >>> starts showing empty bars for the signal strength. > >> > >> RSSI reporting problem or maybe NM issue. When you change kernel to > >> older or newer does this problem go away ? > >> > >>> Running the script: > >>> sudo ifconfig wlan0 down; sleep 1 > >>> sudo rmmod hp_wmi; sudo rmmod iwl3945; sudo rmmod iwlegacy; sudo rmmod > >>> mac80211; sudo rmmod cfg80211 > >>> sleep 2; sudo rmmod rfkill; sync > >>> sudo modprobe rfkill; sudo modprobe cfg80211; sudo modprobe mac80211; > >>> sudo modprobe iwlegacy > >>> sudo modprobe iwl3945; sudo modprobe hp_wmi; sleep 1; sudo ifconfig wlan0 up > >> > >> I run a bit modified script (I do not have hp_wmi.ko and rfkill.ko) for few > >> hours, and did not get any WARNING/crash. I used 3.5, can you check if that > >> problem is also fixed on your system on 3.5 or newer. > > > > On 3.5.2-3.fc17.i686.PAE everything seems stable. The problem I had > > described hasn't happened recently. > > I guess it got fixed in the meantime. > > I was wrong, got it again. > > So, to recap: once the network applet shows no signal, but only then, > removing the wireless modules triggers an unrecoverable kernel panic. > I still haven't compiled a relocatable x86 kernel to get a proper > backtrace using kexec/kdump, sorry. > > I found something else as well. Notice this output of "iwconfig" when > everything is _normal_: > $ iwconfig wlan0 > wlan0 IEEE 802.11abg ESSID:"eduroam" > Mode:Managed Frequency:2.437 GHz Access Point: B8:62:1F:XX:XX:XX > Bit Rate=54 Mb/s Tx-Power=15 dBm > Retry long limit:7 RTS thr:off Fragment thr:off > Power Management:off > Link Quality=58/70 Signal level=-52 dBm > Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 > Tx excessive retries:0 Invalid misc:0 Missed beacon:0 > > When I have the "empty signal bars" issue: > $ iwconfig wlan0 > wlan0 IEEE 802.11abg ESSID:off/any > Mode:Managed Access Point: Not-Associated Tx-Power=15 dBm > Retry long limit:7 RTS thr:off Fragment thr:off > Power Management:off > > In case you're wondering, it is connected and streaming stuff :) > > I can sometimes trigger it on purpose: I just have to roam to a 5GHz > AP of the same ESS, cycle around 2GHz and back to 5GHz (using wpa_cli > roam XX:XX:XX:XX:XX ). If I get "SME: Authentication request to the > driver failed", then disabling NetworkManager (not wireless) and > reenabling will _probably_ get the "empty signal bars" (I was just > able to trigger the "empty signal bars" now after a clean boot). > So I'm guessing something gets corrupted, which is why reloading the > modules will crash. We do not stop mac80211 timers on module unload. I reproduced below warnings with iwlwifi on 3.5 kernel with DEBUG_OBJECTS enabled. I forced roaming many times, and then do "modprobe -r iwlwifi". Unfortunately those steps do not trigger warnings anytime, they happened just once. iwlwifi 0000:02:00.0: ACTIVATE a non DRIVER active station id 0 addr 6c:50:4d:3f:79:73 ------------[ cut here ]------------ WARNING: at lib/debugobjects.c:261 debug_print_object+0x8e/0xb0() Hardware name: SandyBridge Platform ODEBUG: free active (active state 0) object type: timer_list hint: ieee80211_sta_conn_mon_timer+0x0/0x40 [mac80211] Modules linked in: autofs4 sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf ipv6 uinput arc4 sg iwlwifi(-) mac80211 cfg80211 rfkill coretemp kvm_intel kvm crc32c_intel ghash_clmulni_intel microcode pcspkr lpc_ich mfd_core i2c_i801 e1000e ext4 mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom aesni_intel cryptd aes_x86_64 aes_generic ahci libahci i915 drm_kms_helper drm i2c_algo_bit i2c_core video dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan] Pid: 3064, comm: modprobe Not tainted 3.5.0 #1 Call Trace: [<ffffffff810535af>] warn_slowpath_common+0x7f/0xc0 [<ffffffff810536a6>] warn_slowpath_fmt+0x46/0x50 [<ffffffff812901be>] debug_print_object+0x8e/0xb0 [<ffffffffa03a09b0>] ? ieee80211_chswitch_timer+0x40/0x40 [mac80211] [<ffffffff81290a0d>] __debug_check_no_obj_freed+0x10d/0x200 [<ffffffff81290b1d>] debug_check_no_obj_freed+0x1d/0x30 [<ffffffff8117a2b0>] kfree+0xc0/0x330 [<ffffffff810b9083>] ? __lock_release+0x133/0x1a0 [<ffffffff815555f0>] ? _raw_spin_unlock_irqrestore+0x40/0x80 [<ffffffff814957c4>] netdev_release+0x44/0x60 [<ffffffff813704b7>] device_release+0x27/0xa0 [<ffffffff8127da42>] kobject_cleanup+0x82/0x1b0 [<ffffffff8127db7d>] kobject_release+0xd/0x10 [<ffffffff8127d8cc>] kobject_put+0x2c/0x60 [<ffffffff8147e371>] netdev_run_todo+0x101/0x180 [<ffffffff8148f5ae>] rtnl_unlock+0xe/0x10 [<ffffffffa0366178>] ieee80211_unregister_hw+0x58/0x120 [mac80211] [<ffffffffa040912b>] iwlagn_mac_unregister+0x2b/0x40 [iwlwifi] [<ffffffffa03fdf59>] iwl_op_mode_dvm_stop+0x49/0xf0 [iwlwifi] [<ffffffffa041f730>] iwl_drv_stop+0x40/0x60 [iwlwifi] [<ffffffffa0430a39>] iwl_pci_remove+0x25/0x3c [iwlwifi] [<ffffffff812aafc2>] pci_device_remove+0x52/0x120 [<ffffffff813741cc>] __device_release_driver+0x7c/0xe0 [<ffffffff81374308>] driver_detach+0xd8/0xe0 [<ffffffff81372f61>] bus_remove_driver+0x91/0x110 [<ffffffff81374fd2>] driver_unregister+0x62/0xa0 [<ffffffff812ab2b4>] pci_unregister_driver+0x44/0xa0 [<ffffffffa041f3d5>] iwl_pci_unregister_driver+0x15/0x20 [iwlwifi] [<ffffffffa0430a01>] iwl_exit+0x9/0x1c [iwlwifi] [<ffffffff810c50f1>] sys_delete_module+0x1d1/0x2c0 [<ffffffff81555855>] ? retint_swapgs+0x13/0x1b [<ffffffff810e169c>] ? __audit_syscall_entry+0xcc/0x210 [<ffffffff812896ce>] ? trace_hardirqs_on_thunk+0x3a/0x3f [<ffffffff8155de69>] system_call_fastpath+0x16/0x1b ---[ end trace 8070f580fc119b8b ]--- ------------[ cut here ]------------ WARNING: at lib/debugobjects.c:261 debug_print_object+0x8e/0xb0() Hardware name: SandyBridge Platform ODEBUG: free active (active state 0) object type: timer_list hint: ieee80211_sta_bcn_mon_timer+0x0/0x40 [mac80211] Modules linked in: autofs4 sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf ipv6 uinput arc4 sg iwlwifi(-) mac80211 cfg80211 rfkill coretemp kvm_intel kvm crc32c_intel ghash_clmulni_intel microcode pcspkr lpc_ich mfd_core i2c_i801 e1000e ext4 mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom aesni_intel cryptd aes_x86_64 aes_generic ahci libahci i915 drm_kms_helper drm i2c_algo_bit i2c_core video dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan] Pid: 3064, comm: modprobe Tainted: G W 3.5.0 #1 Call Trace: [<ffffffff810535af>] warn_slowpath_common+0x7f/0xc0 [<ffffffff810536a6>] warn_slowpath_fmt+0x46/0x50 [<ffffffff812901be>] debug_print_object+0x8e/0xb0 [<ffffffffa03a09f0>] ? ieee80211_sta_conn_mon_timer+0x40/0x40 [mac80211] [<ffffffff81290a0d>] __debug_check_no_obj_freed+0x10d/0x200 [<ffffffff81290b1d>] debug_check_no_obj_freed+0x1d/0x30 [<ffffffff8117a2b0>] kfree+0xc0/0x330 [<ffffffff810b9083>] ? __lock_release+0x133/0x1a0 [<ffffffff815555f0>] ? _raw_spin_unlock_irqrestore+0x40/0x80 [<ffffffff814957c4>] netdev_release+0x44/0x60 [<ffffffff813704b7>] device_release+0x27/0xa0 [<ffffffff8127da42>] kobject_cleanup+0x82/0x1b0 [<ffffffff8127db7d>] kobject_release+0xd/0x10 [<ffffffff8127d8cc>] kobject_put+0x2c/0x60 [<ffffffff8147e371>] netdev_run_todo+0x101/0x180 [<ffffffff8148f5ae>] rtnl_unlock+0xe/0x10 [<ffffffffa0366178>] ieee80211_unregister_hw+0x58/0x120 [mac80211] [<ffffffffa040912b>] iwlagn_mac_unregister+0x2b/0x40 [iwlwifi] [<ffffffffa03fdf59>] iwl_op_mode_dvm_stop+0x49/0xf0 [iwlwifi] [<ffffffffa041f730>] iwl_drv_stop+0x40/0x60 [iwlwifi] [<ffffffffa0430a39>] iwl_pci_remove+0x25/0x3c [iwlwifi] [<ffffffff812aafc2>] pci_device_remove+0x52/0x120 [<ffffffff813741cc>] __device_release_driver+0x7c/0xe0 [<ffffffff81374308>] driver_detach+0xd8/0xe0 [<ffffffff81372f61>] bus_remove_driver+0x91/0x110 [<ffffffff81374fd2>] driver_unregister+0x62/0xa0 [<ffffffff812ab2b4>] pci_unregister_driver+0x44/0xa0 [<ffffffffa041f3d5>] iwl_pci_unregister_driver+0x15/0x20 [iwlwifi] [<ffffffffa0430a01>] iwl_exit+0x9/0x1c [iwlwifi] [<ffffffff810c50f1>] sys_delete_module+0x1d1/0x2c0 [<ffffffff81555855>] ? retint_swapgs+0x13/0x1b [<ffffffff810e169c>] ? __audit_syscall_entry+0xcc/0x210 [<ffffffff812896ce>] ? trace_hardirqs_on_thunk+0x3a/0x3f [<ffffffff8155de69>] system_call_fastpath+0x16/0x1b ---[ end trace 8070f580fc119b8c ]--- Bridge firewalling registered > misc:" is getting 10 "invalid misc" packets in 10 seconds normal? > Several 'VAL=`date`; VAL="$VAL $(iwconfig wlan0 |grep "Invalid > misc")"; echo $VAL' follow: > Seg Set 24 15:06:36 WEST 2012 Tx excessive retries:5 Invalid misc:133 > Missed beacon:0 > Seg Set 24 15:06:46 WEST 2012 Tx excessive retries:5 Invalid misc:143 > Missed beacon:0 > Seg Set 24 15:07:00 WEST 2012 Tx excessive retries:5 Invalid misc:148 > Missed beacon:0 > Seg Set 24 15:21:46 WEST 2012 Tx excessive retries:22 Invalid misc:495 > Missed beacon:0 > Seg Set 24 15:24:41 WEST 2012 Tx excessive retries:24 Invalid misc:593 > Missed beacon:0 I see lot of that. This can be caused by noisy radio environment, but also can be a firmware/driver bug. Unfortunately those kind of bugs are not easy to fix. Stanislaw -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
