Hi Johannes, I am testing the P2P device support patches. Upon stopping the wpa_supplicant I get the following warning and when I unload brcmfmac it hangs resulting in hung_task_timeout message. The whole rcu stuff still needs to settle in my brain. I suspect the warning is related to brcmfmac unload failure, but maybe you have some ideas where I should look. Gr. AvS [ 1634.031570] ------------[ cut here ]------------ [ 1634.039095] WARNING: at kernel/rcutree.c:1960 rcu_process_callbacks+0x469/0x560() [ 1634.049534] Hardware name: Latitude E6410 [ 1634.056474] Modules linked in: brcmfmac(O) brcmutil(O) cfg80211(O) binfmt_misc snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device dell_laptop dell_wmi psmouse coretemp intel_ips serio_raw snd lpc_ich mfd_core sparse_keymap dcdbas soundcore snd_page_alloc microcode nouveau ttm drm_kms_helper drm i2c_algo_bit mxm_wmi sdhci_pci crc32c_intel firewire_ohci ahci sdhci firewire_core libahci crc_itu_t mmc_core e1000e ptp video pps_core intel_agp intel_gtt agpgart [ 1634.120601] Pid: 16, comm: ksoftirqd/2 Tainted: G O 3.9.0-rc1-wl-testing-lockdep-00002-gc181dcd #1 [ 1634.133917] Call Trace: [ 1634.139833] [<c1039c92>] warn_slowpath_common+0x72/0xa0 [ 1634.148659] [<c10c61f9>] ? rcu_process_callbacks+0x469/0x560 [ 1634.157914] [<c10c61f9>] ? rcu_process_callbacks+0x469/0x560 [ 1634.167121] [<c1039ce2>] warn_slowpath_null+0x22/0x30 [ 1634.175725] [<c10c61f9>] rcu_process_callbacks+0x469/0x560 [ 1634.184783] [<c1042217>] __do_softirq+0xb7/0x240 [ 1634.192952] [<c15279e0>] ? restore_all+0xf/0xf [ 1634.200919] [<c10423dd>] run_ksoftirqd+0x3d/0x70 [ 1634.209076] [<c1063605>] smpboot_thread_fn+0x115/0x190 [ 1634.217753] [<c10634f0>] ? lg_lock_init+0x20/0x20 [ 1634.225973] [<c105b67f>] kthread+0x9f/0xb0 [ 1634.233570] [<c1060000>] ? down_write_trylock+0x60/0x60 [ 1634.242289] [<c152eab7>] ret_from_kernel_thread+0x1b/0x28 [ 1634.251185] [<c105b5e0>] ? flush_kthread_work+0x150/0x150 [ 1634.260087] ---[ end trace c5c2a2c787d3190d ]--- [ 2262.659502] dell_wmi: Received unknown WMI event (0x11) arend@arend-lp-dev:~/sync$ [ 3376.163334] dell_wmi: Received unknown WMI event (0x11) [ 3422.313946] usb 2-1.3: USB disconnect, device number 3 [ 3422.322096] brcmfmac: brcmf_usb_intr_complete: intr cb when DBUS down, ignoring [ 3422.332819] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing to do. [ 3431.537907] brcmfmac: brcmf_fil_cmd_data: bus is down. we have nothing to do. [ 3431.545565] usbcore: deregistering interface driver brcmfmac [ 3606.381631] INFO: task khubd:30 blocked for more than 120 seconds. [ 3606.388366] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 3606.396931] khubd D f4f01cd8 0 30 2 0x00000000 [ 3606.403609] f4f01d10 00000092 00000000 f4f01cd8 00000246 c1748000 c183fb40 c183fb40 [ 3606.411731] d46b6273 0000031c f53e7b40 f4d323c0 c1748000 00000246 00000000 f0820090 [ 3606.419807] 00000246 f4f01cd8 00000046 00000001 00000046 00000000 00000002 f0820090 [ 3606.427881] Call Trace: [ 3606.430518] [<c1097aeb>] ? trace_hardirqs_on+0xb/0x10 [ 3606.435907] [<c1525ff3>] schedule+0x23/0x60 [ 3606.440402] [<f8230c65>] wiphy_unregister+0xa5/0x2e0 [cfg80211] [ 3606.446600] [<c105be00>] ? __init_waitqueue_head+0x60/0x60 [ 3606.452451] [<f8356db5>] brcmf_free_vif+0x55/0x70 [brcmfmac] [ 3606.458389] [<f8357405>] brcmf_cfg80211_detach+0x45/0x70 [brcmfmac] [ 3606.464955] [<f8361351>] brcmf_del_if+0x81/0x170 [brcmfmac] [ 3606.470803] [<f836177e>] brcmf_detach+0x5e/0xd0 [brcmfmac] [ 3606.476572] [<f836bcd3>] brcmf_usb_disconnect+0x63/0xa0 [brcmfmac] [ 3606.483093] [<c13daf3a>] usb_unbind_interface+0x4a/0x180 [ 3606.488706] [<c136e704>] __device_release_driver+0x64/0xc0 [ 3606.494472] [<c136e786>] device_release_driver+0x26/0x40 [ 3606.500121] [<c136e245>] bus_remove_device+0xa5/0xd0 [ 3606.505385] [<c136bdfd>] device_del+0xdd/0x150 [ 3606.510108] [<c13d8cf9>] usb_disable_device+0x89/0x1c0 [ 3606.515590] [<c13d14d3>] usb_disconnect+0x93/0x160 [ 3606.520681] [<c13d28c0>] hub_thread+0x2c0/0x1160 [ 3606.525580] [<c1525318>] ? __schedule+0x3a8/0x7e0 [ 3606.530583] [<c105be00>] ? __init_waitqueue_head+0x60/0x60 [ 3606.536437] [<c1064cae>] ? complete+0x4e/0x60 [ 3606.541105] [<c13d2600>] ? hub_port_debounce+0xd0/0xd0 [ 3606.546609] [<c105b67f>] kthread+0x9f/0xb0 [ 3606.551017] [<c1060000>] ? down_write_trylock+0x60/0x60 [ 3606.556553] [<c152eab7>] ret_from_kernel_thread+0x1b/0x28 [ 3606.562287] [<c105b5e0>] ? flush_kthread_work+0x150/0x150 [ 3606.568015] INFO: lockdep is turned off. [ 3606.572176] INFO: task rmmod:2686 blocked for more than 120 seconds. [ 3606.578814] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 3606.586870] rmmod D f2727e08 0 2686 2685 0x00000000 [ 3606.593483] f2727e64 00000086 f44f9604 f2727e08 f71128d0 c1748000 c183fb40 c183fb40 [ 3606.601597] f86cc1e4 0000031e f53e7b40 f44f91e0 c1748000 f72a89b4 f2727e28 00000282 [ 3606.609753] f44f91e0 f44f91e0 f7112898 00000000 00000000 f2727e74 00000246 00000000 [ 3606.617897] Call Trace: [ 3606.620545] [<c136eea8>] ? driver_detach+0x38/0xa0 [ 3606.625654] [<c1525ff3>] schedule+0x23/0x60 [ 3606.630393] [<c15262c8>] schedule_preempt_disabled+0x18/0x30 [ 3606.636356] [<c1523b9d>] mutex_lock_nested+0x13d/0x2e0 [ 3606.641882] [<c136eea8>] ? driver_detach+0x38/0xa0 [ 3606.647016] [<c136eea8>] driver_detach+0x38/0xa0 [ 3606.651950] [<c136e543>] bus_remove_driver+0x63/0xa0 [ 3606.657288] [<c136f4f8>] driver_unregister+0x48/0x80 [ 3606.662565] [<c13da1bd>] usb_deregister+0x5d/0xb0 [ 3606.667648] [<f836d049>] brcmf_usb_exit+0x49/0x90 [brcmfmac] [ 3606.673625] [<f836ba00>] ? brcmf_usb_ctlwrite_complete+0x90/0x90 [brcmfmac] [ 3606.680906] [<f836dd6d>] brcmfmac_module_exit+0x17/0x1e [brcmfmac] [ 3606.687430] [<c10a0485>] sys_delete_module+0x135/0x200 [ 3606.692901] [<c111f686>] ? vm_munmap+0x46/0x60 [ 3606.697661] [<c105ff5b>] ? up_write+0x1b/0x30 [ 3606.702362] [<c111f686>] ? vm_munmap+0x46/0x60 [ 3606.707199] [<c152eb4d>] sysenter_do_call+0x12/0x38 [ 3606.712388] INFO: lockdep is turned off. -- 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
