From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from lists.s-osg.org ([54.187.51.154]:52893 "EHLO lists.s-osg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750818AbbKKOWz (ORCPT ); Wed, 11 Nov 2015 09:22:55 -0500 Subject: Re: Slow path and cpu lock warnings - MC Next Gen To: Mauro Carvalho Chehab References: <5640C0F2.9070000@osg.samsung.com> <5640C1DA.7040100@osg.samsung.com> <20151111103053.448ac440@recife.lan> Cc: Javier Martinez Canillas , Linux Media Mailing List , Shuah Khan From: Shuah Khan Message-ID: <56434F37.9070007@osg.samsung.com> Date: Wed, 11 Nov 2015 07:22:47 -0700 MIME-Version: 1.0 In-Reply-To: <20151111103053.448ac440@recife.lan> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: On 11/11/2015 05:30 AM, Mauro Carvalho Chehab wrote: > Em Mon, 09 Nov 2015 08:55:06 -0700 > Shuah Khan escreveu: > >> On 11/09/2015 08:51 AM, Shuah Khan wrote: >>> As I mentioned on the IRC, here is the log for the problems I am seeing. >>> I have to do eject HVR 950Q TV stick to see the problem. >>> >>> mc_next_gen.v8.4 branch with no changes. >>> >>> I can test and debug this week. >>> >>> thanks, >>> -- Shuah >>> >> >> Forgot to cc linux-media, just in case others are interested >> and have ideas on debugging. >> >> thanks, >> -- Shuah > >> [ 8.558049] ====================================================== >> [ 8.558056] [ INFO: possible circular locking dependency detected ] >> [ 8.558063] 4.2.0-rc2+ #21 Not tainted >> [ 8.558070] ------------------------------------------------------- >> [ 8.558077] systemd-udevd/143 is trying to acquire lock: >> [ 8.558084] (init_mutex){+.+.+.}, at: [] acpi_video_get_backlight_type+0x17/0x163 [video] >> [ 8.558104] >> but task is already holding lock: >> [ 8.558114] (&(&backlight_notifier)->rwsem){++++..}, at: [] __blocking_notifier_call_chain+0x39/0x70 >> [ 8.558133] >> which lock already depends on the new lock. >> >> [ 8.558147] >> the existing dependency chain (in reverse order) is: >> [ 8.558158] >> -> #1 (&(&backlight_notifier)->rwsem){++++..}: >> [ 8.558170] [] lock_acquire+0xb1/0x130 >> [ 8.558180] [] down_write+0x36/0x70 >> [ 8.558189] [] blocking_notifier_chain_register+0x21/0xb0 >> [ 8.558202] [] backlight_register_notifier+0x18/0x20 >> [ 8.558212] [] acpi_video_get_backlight_type+0xfa/0x163 [video] >> [ 8.558225] [] acpi_video_bus_add+0x686/0xdfa [video] >> [ 8.558237] [] acpi_device_probe+0x50/0xf7 >> [ 8.558247] [] driver_probe_device+0x14d/0x470 >> [ 8.558257] [] __driver_attach+0x94/0xa0 >> [ 8.558266] [] bus_for_each_dev+0x66/0xa0 >> [ 8.558275] [] driver_attach+0x1e/0x20 >> [ 8.558287] [] bus_add_driver+0x1ee/0x280 >> [ 8.558296] [] driver_register+0x60/0xe0 >> [ 8.558304] [] acpi_bus_register_driver+0x3b/0x43 >> [ 8.558313] [] acpi_video_register+0x6e/0x90 [video] >> [ 8.558322] [] hid_generic_exit+0x87/0x1000 [hid_generic] >> [ 8.558334] [] do_one_initcall+0xab/0x1d0 >> [ 8.558344] [] do_init_module+0x60/0x1e9 >> [ 8.558353] [] load_module+0x2170/0x2780 >> [ 8.558363] [] SyS_finit_module+0x9a/0xc0 >> [ 8.558372] [] entry_SYSCALL_64_fastpath+0x12/0x6f >> [ 8.558381] >> -> #0 (init_mutex){+.+.+.}: >> [ 8.558392] [] __lock_acquire+0x1f29/0x1f90 >> [ 8.558401] [] lock_acquire+0xb1/0x130 >> [ 8.558409] [] mutex_lock_nested+0x4b/0x340 >> [ 8.558417] [] acpi_video_get_backlight_type+0x17/0x163 [video] >> [ 8.558430] [] acpi_video_backlight_notify+0x19/0x2f [video] >> [ 8.558442] [] notifier_call_chain+0x5d/0x80 >> [ 8.558451] [] __blocking_notifier_call_chain+0x51/0x70 >> [ 8.558462] [] blocking_notifier_call_chain+0x16/0x20 >> [ 8.558474] [] backlight_device_register+0x1a2/0x260 >> [ 8.558483] [] radeon_atom_backlight_init+0xda/0x1d0 [radeon] >> [ 8.558543] [] radeon_link_encoder_connector+0xc3/0x130 [radeon] >> [ 8.558585] [] radeon_get_atom_connector_info_from_object_table+0x3a6/0x950 [radeon] >> [ 8.558625] [] radeon_modeset_init+0x5dc/0xa40 [radeon] >> [ 8.558667] [] radeon_driver_load_kms+0x12b/0x220 [radeon] >> [ 8.558706] [] drm_dev_register+0xb1/0x100 [drm] >> [ 8.558728] [] drm_get_pci_dev+0x8d/0x1e0 [drm] >> [ 8.558747] [] radeon_pci_probe+0xa4/0xc0 [radeon] >> [ 8.558783] [] local_pci_probe+0x45/0xa0 >> [ 8.558792] [] pci_device_probe+0xd1/0x120 >> [ 8.558800] [] driver_probe_device+0x14d/0x470 >> [ 8.558809] [] __driver_attach+0x94/0xa0 >> [ 8.558818] [] bus_for_each_dev+0x66/0xa0 >> [ 8.558827] [] driver_attach+0x1e/0x20 >> [ 8.558835] [] bus_add_driver+0x1ee/0x280 >> [ 8.558844] [] driver_register+0x60/0xe0 >> [ 8.558852] [] __pci_register_driver+0x64/0x70 >> [ 8.558860] [] drm_pci_init+0xe0/0x110 [drm] >> [ 8.558879] [] radeon_init+0x9d/0xb2 [radeon] >> [ 8.558911] [] do_one_initcall+0xab/0x1d0 >> [ 8.558920] [] do_init_module+0x60/0x1e9 >> [ 8.558928] [] load_module+0x2170/0x2780 >> [ 8.558937] [] SyS_finit_module+0x9a/0xc0 >> [ 8.558945] [] entry_SYSCALL_64_fastpath+0x12/0x6f >> [ 8.558954] >> other info that might help us debug this: >> >> [ 8.558968] Possible unsafe locking scenario: >> >> [ 8.558978] CPU0 CPU1 >> [ 8.558984] ---- ---- >> [ 8.558989] lock(&(&backlight_notifier)->rwsem); >> [ 8.558997] lock(init_mutex); >> [ 8.559004] lock(&(&backlight_notifier)->rwsem); >> [ 8.559015] lock(init_mutex); >> [ 8.559021] >> *** DEADLOCK *** >> >> [ 8.559035] 4 locks held by systemd-udevd/143: >> [ 8.559041] #0: (&dev->mutex){......}, at: [] __driver_attach+0x4b/0xa0 >> [ 8.559056] #1: (&dev->mutex){......}, at: [] __driver_attach+0x59/0xa0 >> [ 8.559072] #2: (drm_global_mutex){+.+.+.}, at: [] drm_dev_register+0x26/0x100 [drm] >> [ 8.559097] #3: (&(&backlight_notifier)->rwsem){++++..}, at: [] __blocking_notifier_call_chain+0x39/0x70 >> [ 8.559113] >> stack backtrace: >> [ 8.559124] CPU: 2 PID: 143 Comm: systemd-udevd Not tainted 4.2.0-rc2+ #21 >> [ 8.559132] Hardware name: Hewlett-Packard HP ProBook 6475b/180F, BIOS 68TTU Ver. F.04 08/03/2012 >> [ 8.559143] ffffffff8285ace0 ffff88002b09f378 ffffffff817f4254 ffffffff810c155a >> [ 8.559156] ffffffff8285ace0 ffff88002b09f3c8 ffffffff810ac6a3 0000000000000003 >> [ 8.559169] ffff88002b09f438 ffff88002b09f3c8 ffff88002b06b398 ffff88002b06a600 >> [ 8.559181] Call Trace: >> [ 8.559190] [] dump_stack+0x45/0x57 >> [ 8.559208] [] ? console_unlock+0x1da/0x580 >> [ 8.559216] [] print_circular_bug+0x1e3/0x250 >> [ 8.559225] [] __lock_acquire+0x1f29/0x1f90 >> [ 8.559234] [] lock_acquire+0xb1/0x130 >> [ 8.559243] [] ? acpi_video_get_backlight_type+0x17/0x163 [video] >> [ 8.559255] [] mutex_lock_nested+0x4b/0x340 >> [ 8.559264] [] ? acpi_video_get_backlight_type+0x17/0x163 [video] >> [ 8.559277] [] acpi_video_get_backlight_type+0x17/0x163 [video] >> [ 8.559289] [] acpi_video_backlight_notify+0x19/0x2f [video] >> [ 8.559301] [] notifier_call_chain+0x5d/0x80 >> [ 8.559310] [] __blocking_notifier_call_chain+0x51/0x70 >> [ 8.559319] [] blocking_notifier_call_chain+0x16/0x20 >> [ 8.559327] [] backlight_device_register+0x1a2/0x260 >> [ 8.559374] [] radeon_atom_backlight_init+0xda/0x1d0 [radeon] >> [ 8.559416] [] radeon_link_encoder_connector+0xc3/0x130 [radeon] >> [ 8.559455] [] radeon_get_atom_connector_info_from_object_table+0x3a6/0x950 [radeon] >> [ 8.559481] [] ? drm_mode_crtc_set_gamma_size+0x5b/0x70 [drm] >> [ 8.559523] [] radeon_modeset_init+0x5dc/0xa40 [radeon] >> [ 8.559566] [] ? radeon_ib_ring_tests+0x58/0xc0 [radeon] >> [ 8.559601] [] radeon_driver_load_kms+0x12b/0x220 [radeon] >> [ 8.559620] [] drm_dev_register+0xb1/0x100 [drm] >> [ 8.559639] [] drm_get_pci_dev+0x8d/0x1e0 [drm] >> [ 8.559674] [] radeon_pci_probe+0xa4/0xc0 [radeon] >> [ 8.559683] [] local_pci_probe+0x45/0xa0 >> [ 8.559691] [] ? pci_match_device+0xe0/0x110 >> [ 8.559699] [] pci_device_probe+0xd1/0x120 >> [ 8.559708] [] driver_probe_device+0x14d/0x470 >> [ 8.559717] [] __driver_attach+0x94/0xa0 >> [ 8.559726] [] ? driver_probe_device+0x470/0x470 >> [ 8.559734] [] bus_for_each_dev+0x66/0xa0 >> [ 8.559743] [] driver_attach+0x1e/0x20 >> [ 8.559752] [] bus_add_driver+0x1ee/0x280 >> [ 8.559760] [] driver_register+0x60/0xe0 >> [ 8.559767] [] __pci_register_driver+0x64/0x70 >> [ 8.559786] [] drm_pci_init+0xe0/0x110 [drm] >> [ 8.559794] [] ? 0xffffffffa039d000 >> [ 8.559825] [] radeon_init+0x9d/0xb2 [radeon] >> [ 8.559834] [] do_one_initcall+0xab/0x1d0 >> [ 8.559843] [] ? do_init_module+0x28/0x1e9 >> [ 8.559852] [] ? kmem_cache_alloc_trace+0xbb/0x160 >> [ 8.559862] [] do_init_module+0x60/0x1e9 >> [ 8.559870] [] load_module+0x2170/0x2780 >> [ 8.559878] [] ? __symbol_put+0x40/0x40 >> [ 8.559888] [] SyS_finit_module+0x9a/0xc0 >> [ 8.559897] [] entry_SYSCALL_64_fastpath+0x12/0x6f > > Sorry, but I fail to see how this is related to the V4L2 subsystem. > > At least on my eyes, it seems that the bug is somewhere at the Radeon > driver. > Mauro, I think you didn't look down the dmesg far enough. The following is the problem I am talking about and you will see media_device_unregister() on the stack. This occurs as soon as the device is removed. thanks, -- Shuah [ 304.245575] NMI watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [kworker/2:1:56] [ 304.245587] Modules linked in: snd_usb_audio snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_seq snd_rawmidi ir_lirc_codec lirc_dev ir_sony_decoder ir_xmp_decoder ir_sharp_decoder ir_sanyo_decoder ir_mce_kbd_decoder snd_seq_device ir_jvc_decoder ir_rc5_decoder ir_rc6_decoder ir_nec_decoder au8522_dig tuner au8522_decoder au8522_common au0828 tveeprom nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables binfmt_misc nls_iso8859_1 kvm_amd kvm uvcvideo videobuf2_vmalloc videobuf2_memops ghash_clmulni_intel videobuf2_core aesni_intel aes_x86_64 ablk_helper cryptd lrw hp_wmi gf128mul sparse_keymap snd_hda_codec_idt glue_helper snd_hda_codec_generic snd_hda_codec_hdmi [ 304.245661] snd_hda_intel microcode snd_hda_codec hp_accel tpm_infineon snd_hda_core joydev k10temp serio_raw lis3lv02d snd_hwdep input_polldev snd_pcm tpm_tis snd_timer i2c_piix4 shpchp mac_hid parport_pc ppdev lp parport autofs4 pl2303 usbserial hid_generic radeon usbhid psmouse i2c_algo_bit hid firewire_ohci ttm firewire_core drm_kms_helper sdhci_pci crc_itu_t r8169 sdhci mii drm wmi video [ 304.245709] irq event stamp: 1850 [ 304.245712] hardirqs last enabled at (1849): [] _raw_spin_unlock_irq+0x30/0x40 [ 304.245722] hardirqs last disabled at (1850): [] _raw_spin_lock_irq+0x17/0x50 [ 304.245727] softirqs last enabled at (512): [] addrconf_verify_rtnl+0x23d/0x500 [ 304.245735] softirqs last disabled at (506): [] addrconf_verify_rtnl+0x23/0x500 [ 304.245744] CPU: 2 PID: 56 Comm: kworker/2:1 Not tainted 4.2.0-rc2+ #21 [ 304.245747] Hardware name: Hewlett-Packard HP ProBook 6475b/180F, BIOS 68TTU Ver. F.04 08/03/2012 [ 304.245754] Workqueue: usb_hub_wq hub_event [ 304.245758] task: ffff88021e222600 ti: ffff880218dec000 task.ti: ffff880218dec000 [ 304.245761] RIP: 0010:[] [] delay_tsc+0x1a/0x50 [ 304.245769] RSP: 0018:ffff880218def938 EFLAGS: 00000206 [ 304.245772] RAX: 000000001d95bc8c RBX: 0000000180100008 RCX: 000000001d95bc8c [ 304.245775] RDX: 00000000000000ad RSI: 0000000000000002 RDI: 0000000000000001 [ 304.245777] RBP: ffff880218def938 R08: 0000000000000001 R09: 0000000000000000 [ 304.245780] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff817fe161 [ 304.245783] R13: ffffffff810d021e R14: ffffffff817fe161 R15: ffffffff810d021e [ 304.245786] FS: 00007fde9af5e940(0000) GS:ffff88023ed00000(0000) knlGS:0000000000000000 [ 304.245789] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 304.245792] CR2: 00007f21c0f55000 CR3: 0000000001e0b000 CR4: 00000000000407e0 [ 304.245794] Stack: [ 304.245796] ffff880218def948 ffffffff813bf20f ffff880218def978 ffffffff810b428c [ 304.245802] ffff88008ced0d70 ffff88008ced0d70 ffff880231f1f800 ffff880231f1fd40 [ 304.245807] ffff880218def9a8 ffffffff817fca99 ffffffff8160f70b ffffffff8160f844 [ 304.245812] Call Trace: [ 304.245819] [] __delay+0xf/0x20 [ 304.245826] [] do_raw_spin_lock+0x8c/0x150 [ 304.245830] [] _raw_spin_lock+0x39/0x40 [ 304.245837] [] ? media_device_unregister_entity+0x3b/0x130 [ 304.245841] [] ? media_device_unregister+0x44/0x120 [ 304.245846] [] media_device_unregister_entity+0x3b/0x130 [ 304.245851] [] media_device_unregister+0xba/0x120 [ 304.245859] [] au0828_usb_release+0x22/0x50 [au0828] [ 304.245868] [] au0828_usb_v4l2_release+0x6a/0x80 [au0828] [ 304.245874] [] v4l2_device_release+0x1b/0x20 [ 304.245878] [] v4l2_device_put+0x25/0x30 [ 304.245883] [] au0828_usb_disconnect+0xc4/0xf0 [au0828] [ 304.245888] [] usb_unbind_interface+0x86/0x270 [ 304.245893] [] ? trace_hardirqs_on+0xd/0x10 [ 304.245900] [] __device_release_driver+0xa1/0x150 [ 304.245904] [] device_release_driver+0x25/0x40 [ 304.245910] [] bus_remove_device+0x11c/0x1a0 [ 304.245914] [] device_del+0x139/0x250 [ 304.245919] [] ? remove_intf_ep_devs+0x41/0x60 [ 304.245923] [] usb_disable_device+0x89/0x270 [ 304.245927] [] usb_disconnect+0x94/0x2b0 [ 304.245931] [] hub_event+0x767/0x1580 [ 304.245937] [] ? finish_task_switch+0x52/0x1e0 [ 304.245943] [] process_one_work+0x1cf/0x540 [ 304.245947] [] ? process_one_work+0x163/0x540 [ 304.245952] [] worker_thread+0x48/0x4a0 [ 304.245957] [] ? process_one_work+0x540/0x540 [ 304.245961] [] ? process_one_work+0x540/0x540 [ 304.245965] [] kthread+0xe4/0x100 [ 304.245971] [] ? kthread_create_on_node+0x220/0x220 [ 304.245975] [] ret_from_fork+0x3f/0x70 [ 304.245980] [] ? kthread_create_on_node+0x220/0x220 [ 304.245982] Code: 00 5d c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 65 8b 35 90 ae c4 7e 0f ae f0 0f 31 89 c1 0f ae f0 <0f> 31 48 c1 e2 20 89 c0 48 09 c2 89 d0 29 ca 39 d7 76 1c f3 90 [ 332.243453] NMI watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [kworker/2:1:56] [ 332.243464] Modules linked in: snd_usb_audio snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_seq snd_rawmidi ir_lirc_codec lirc_dev ir_sony_decoder ir_xmp_decoder ir_sharp_decoder ir_sanyo_decoder ir_mce_kbd_decoder snd_seq_device ir_jvc_decoder ir_rc5_decoder ir_rc6_decoder ir_nec_decoder au8522_dig tuner au8522_decoder au8522_common au0828 tveeprom nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables binfmt_misc nls_iso8859_1 kvm_amd kvm uvcvideo videobuf2_vmalloc videobuf2_memops ghash_clmulni_intel videobuf2_core aesni_intel aes_x86_64 ablk_helper cryptd lrw hp_wmi gf128mul sparse_keymap snd_hda_codec_idt glue_helper snd_hda_codec_generic snd_hda_codec_hdmi [ 332.243542] snd_hda_intel microcode snd_hda_codec hp_accel tpm_infineon snd_hda_core joydev k10temp serio_raw lis3lv02d snd_hwdep input_polldev snd_pcm tpm_tis snd_timer i2c_piix4 shpchp mac_hid parport_pc ppdev lp parport autofs4 pl2303 usbserial hid_generic radeon usbhid psmouse i2c_algo_bit hid firewire_ohci ttm firewire_core drm_kms_helper sdhci_pci crc_itu_t r8169 sdhci mii drm wmi video [ 332.243592] irq event stamp: 1850 [ 332.243595] hardirqs last enabled at (1849): [] _raw_spin_unlock_irq+0x30/0x40 [ 332.243605] hardirqs last disabled at (1850): [] _raw_spin_lock_irq+0x17/0x50 [ 332.243612] softirqs last enabled at (512): [] addrconf_verify_rtnl+0x23d/0x500 [ 332.243619] softirqs last disabled at (506): [] addrconf_verify_rtnl+0x23/0x500 [ 332.243628] CPU: 2 PID: 56 Comm: kworker/2:1 Tainted: G L 4.2.0-rc2+ #21 [ 332.243632] Hardware name: Hewlett-Packard HP ProBook 6475b/180F, BIOS 68TTU Ver. F.04 08/03/2012 [ 332.243638] Workqueue: usb_hub_wq hub_event [ 332.243642] task: ffff88021e222600 ti: ffff880218dec000 task.ti: ffff880218dec000 [ 332.243645] RIP: 0010:[] [] delay_tsc+0x15/0x50 [ 332.243653] RSP: 0018:ffff880218def938 EFLAGS: 00000202 [ 332.243656] RAX: 0000000015191edb RBX: 0000000180100008 RCX: 0000000015191d34 [ 332.243659] RDX: 00000000000000bc RSI: 0000000000000002 RDI: 0000000000000001 [ 332.243662] RBP: ffff880218def938 R08: 0000000000000001 R09: 0000000000000000 [ 332.243665] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff817fe161 [ 332.243667] R13: ffffffff810d021e R14: ffffffff817fe161 R15: ffffffff810d021e [ 332.243671] FS: 00007fde9af5e940(0000) GS:ffff88023ed00000(0000) knlGS:0000000000000000 [ 332.243674] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 332.243677] CR2: 00007f21c0f55000 CR3: 0000000001e0b000 CR4: 00000000000407e0 [ 332.243679] Stack: [ 332.243681] ffff880218def948 ffffffff813bf20f ffff880218def978 ffffffff810b428c [ 332.243687] ffff88008ced0d70 ffff88008ced0d70 ffff880231f1f800 ffff880231f1fd40 [ 332.243692] ffff880218def9a8 ffffffff817fca99 ffffffff8160f70b ffffffff8160f844 [ 332.243697] Call Trace: [ 332.243704] [] __delay+0xf/0x20 [ 332.243711] [] do_raw_spin_lock+0x8c/0x150 [ 332.243715] [] _raw_spin_lock+0x39/0x40 [ 332.243721] [] ? media_device_unregister_entity+0x3b/0x130 [ 332.243726] [] ? media_device_unregister+0x44/0x120 [ 332.243730] [] media_device_unregister_entity+0x3b/0x130 [ 332.243734] [] media_device_unregister+0xba/0x120 [ 332.243743] [] au0828_usb_release+0x22/0x50 [au0828] [ 332.243749] [] au0828_usb_v4l2_release+0x6a/0x80 [au0828] [ 332.243754] [] v4l2_device_release+0x1b/0x20 [ 332.243758] [] v4l2_device_put+0x25/0x30 [ 332.243763] [] au0828_usb_disconnect+0xc4/0xf0 [au0828] [ 332.243768] [] usb_unbind_interface+0x86/0x270 [ 332.243773] [] ? trace_hardirqs_on+0xd/0x10 [ 332.243780] [] __device_release_driver+0xa1/0x150 [ 332.243784] [] device_release_driver+0x25/0x40 [ 332.243790] [] bus_remove_device+0x11c/0x1a0 [ 332.243794] [] device_del+0x139/0x250 [ 332.243799] [] ? remove_intf_ep_devs+0x41/0x60 [ 332.243804] [] usb_disable_device+0x89/0x270 [ 332.243808] [] usb_disconnect+0x94/0x2b0 [ 332.243812] [] hub_event+0x767/0x1580 [ 332.243817] [] ? finish_task_switch+0x52/0x1e0 [ 332.243823] [] process_one_work+0x1cf/0x540 [ 332.243827] [] ? process_one_work+0x163/0x540 [ 332.243832] [] worker_thread+0x48/0x4a0 [ 332.243837] [] ? process_one_work+0x540/0x540 [ 332.243841] [] ? process_one_work+0x540/0x540 [ 332.243846] [] kthread+0xe4/0x100 [ 332.243851] [] ? kthread_create_on_node+0x220/0x220 [ 332.243855] [] ret_from_fork+0x3f/0x70 [ 332.243860] [] ? kthread_create_on_node+0x220/0x220 [ 332.243862] Code: ff 15 68 bb ae 00 5d c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 65 8b 35 90 ae c4 7e 0f ae f0 0f 31 <89> c1 0f ae f0 0f 31 48 c1 e2 20 89 c0 48 09 c2 89 d0 29 ca 39 [ 344.082652] INFO: rcu_sched self-detected stall on CPU { 2} (t=16250 jiffies g=16088 c=16087 q=6192) [ 344.082671] Task dump for CPU 2: [ 344.082675] kworker/2:1 R running task 0 56 2 0x00000008 [ 344.082686] Workqueue: usb_hub_wq hub_event [ 344.082689] 0000000000000002 ffff88023ed03d58 ffffffff8108d999 ffffffff8108d8d1 [ 344.082695] 0000000000000000 0000000000000002 ffffffff81e4ffc0 ffff88023ed03d78 [ 344.082701] ffffffff8109089b ffff88023ed16840 0000000000000003 ffff88023ed03da8 [ 344.082706] Call Trace: [ 344.082709] [] sched_show_task+0x129/0x230 [ 344.082721] [] ? sched_show_task+0x61/0x230 [ 344.082727] [] dump_cpu_task+0x3b/0x50 [ 344.082733] [] rcu_dump_cpu_stacks+0x8e/0xe0 [ 344.082738] [] rcu_check_callbacks+0x486/0x770 [ 344.082743] [] ? cpuacct_account_field+0xd0/0x1a0 [ 344.082747] [] ? cpuacct_account_field+0x5/0x1a0 [ 344.082753] [] ? tick_sched_timer+0x22/0x80 [ 344.082758] [] ? tick_sched_do_timer+0x30/0x30 [ 344.082762] [] update_process_times+0x39/0x60 [ 344.082767] [] tick_sched_handle.isra.16+0x25/0x60 [ 344.082772] [] tick_sched_timer+0x44/0x80 [ 344.082776] [] __hrtimer_run_queues+0xce/0x270 [ 344.082781] [] hrtimer_interrupt+0xab/0x1b0 [ 344.082787] [] local_apic_timer_interrupt+0x3c/0x70 [ 344.082792] [] smp_apic_timer_interrupt+0x41/0x60 [ 344.082796] [] apic_timer_interrupt+0x6d/0x80 [ 344.082799] [] ? delay_tsc+0x13/0x50 [ 344.082808] [] __delay+0xf/0x20 [ 344.082812] [] do_raw_spin_lock+0x8c/0x150 [ 344.082816] [] _raw_spin_lock+0x39/0x40 [ 344.082821] [] ? media_device_unregister_entity+0x3b/0x130 [ 344.082825] [] ? media_device_unregister+0x44/0x120 [ 344.082829] [] media_device_unregister_entity+0x3b/0x130 [ 344.082833] [] media_device_unregister+0xba/0x120 [ 344.082841] [] au0828_usb_release+0x22/0x50 [au0828] [ 344.082846] [] au0828_usb_v4l2_release+0x6a/0x80 [au0828] [ 344.082851] [] v4l2_device_release+0x1b/0x20 [ 344.082854] [] v4l2_device_put+0x25/0x30 [ 344.082860] [] au0828_usb_disconnect+0xc4/0xf0 [au0828] [ 344.082865] [] usb_unbind_interface+0x86/0x270 [ 344.082869] [] ? trace_hardirqs_on+0xd/0x10 [ 344.082875] [] __device_release_driver+0xa1/0x150 [ 344.082880] [] device_release_driver+0x25/0x40 [ 344.082885] [] bus_remove_device+0x11c/0x1a0 [ 344.082889] [] device_del+0x139/0x250 [ 344.082894] [] ? remove_intf_ep_devs+0x41/0x60 [ 344.082898] [] usb_disable_device+0x89/0x270 [ 344.082902] [] usb_disconnect+0x94/0x2b0 [ 344.082906] [] hub_event+0x767/0x1580 [ 344.082911] [] ? finish_task_switch+0x52/0x1e0 [ 344.082917] [] process_one_work+0x1cf/0x540 [ 344.082921] [] ? process_one_work+0x163/0x540 [ 344.082926] [] worker_thread+0x48/0x4a0 [ 344.082931] [] ? process_one_work+0x540/0x540 [ 344.082935] [] ? process_one_work+0x540/0x540 [ 344.082939] [] kthread+0xe4/0x100 [ 344.082944] [] ? kthread_create_on_node+0x220/0x220 [ 344.082949] [] ret_from_fork+0x3f/0x70 [ 344.082953] [] ? kthread_create_on_node+0x220/0x220 [ 368.241164] NMI watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [kworker/2:1:56] [ 368.241173] Modules linked in: snd_usb_audio snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_seq snd_rawmidi ir_lirc_codec lirc_dev ir_sony_decoder ir_xmp_decoder ir_sharp_decoder ir_sanyo_decoder ir_mce_kbd_decoder snd_seq_device ir_jvc_decoder ir_rc5_decoder ir_rc6_decoder ir_nec_decoder au8522_dig tuner au8522_decoder au8522_common au0828 tveeprom nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables binfmt_misc nls_iso8859_1 kvm_amd kvm uvcvideo videobuf2_vmalloc videobuf2_memops ghash_clmulni_intel videobuf2_core aesni_intel aes_x86_64 ablk_helper cryptd lrw hp_wmi gf128mul sparse_keymap snd_hda_codec_idt glue_helper snd_hda_codec_generic snd_hda_codec_hdmi [ 368.241251] snd_hda_intel microcode snd_hda_codec hp_accel tpm_infineon snd_hda_core joydev k10temp serio_raw lis3lv02d snd_hwdep input_polldev snd_pcm tpm_tis snd_timer i2c_piix4 shpchp mac_hid parport_pc ppdev lp parport autofs4 pl2303 usbserial hid_generic radeon usbhid psmouse i2c_algo_bit hid firewire_ohci ttm firewire_core drm_kms_helper sdhci_pci crc_itu_t r8169 sdhci mii drm wmi video [ 368.241300] irq event stamp: 1850 [ 368.241303] hardirqs last enabled at (1849): [] _raw_spin_unlock_irq+0x30/0x40 [ 368.241313] hardirqs last disabled at (1850): [] _raw_spin_lock_irq+0x17/0x50 [ 368.241318] softirqs last enabled at (512): [] addrconf_verify_rtnl+0x23d/0x500 [ 368.241326] softirqs last disabled at (506): [] addrconf_verify_rtnl+0x23/0x500 [ 368.241335] CPU: 2 PID: 56 Comm: kworker/2:1 Tainted: G L 4.2.0-rc2+ #21 [ 368.241339] Hardware name: Hewlett-Packard HP ProBook 6475b/180F, BIOS 68TTU Ver. F.04 08/03/2012 [ 368.241345] Workqueue: usb_hub_wq hub_event [ 368.241349] task: ffff88021e222600 ti: ffff880218dec000 task.ti: ffff880218dec000 [ 368.241352] RIP: 0010:[] [] delay_tsc+0x1a/0x50 [ 368.241359] RSP: 0018:ffff880218def938 EFLAGS: 00000206 [ 368.241363] RAX: 000000005363a164 RBX: 0000000180100008 RCX: 000000005363a164 [ 368.241365] RDX: 00000000000000cf RSI: 0000000000000002 RDI: 0000000000000001 [ 368.241368] RBP: ffff880218def938 R08: 0000000000000001 R09: 0000000000000000 [ 368.241370] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff817fe161 [ 368.241373] R13: ffffffff810d021e R14: ffff880218def8c8 R15: 0140000000000000 [ 368.241377] FS: 00007fde9af5e940(0000) GS:ffff88023ed00000(0000) knlGS:0000000000000000 [ 368.241379] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 368.241382] CR2: 00007f21c0f55000 CR3: 0000000001e0b000 CR4: 00000000000407e0 [ 368.241384] Stack: [ 368.241387] ffff880218def948 ffffffff813bf20f ffff880218def978 ffffffff810b428c [ 368.241392] ffff88008ced0d70 ffff88008ced0d70 ffff880231f1f800 ffff880231f1fd40 [ 368.241398] ffff880218def9a8 ffffffff817fca99 ffffffff8160f70b ffffffff8160f844 [ 368.241403] Call Trace: [ 368.241410] [] __delay+0xf/0x20 [ 368.241416] [] do_raw_spin_lock+0x8c/0x150 [ 368.241421] [] _raw_spin_lock+0x39/0x40 [ 368.241427] [] ? media_device_unregister_entity+0x3b/0x130 [ 368.241431] [] ? media_device_unregister+0x44/0x120 [ 368.241436] [] media_device_unregister_entity+0x3b/0x130 [ 368.241440] [] media_device_unregister+0xba/0x120 [ 368.241449] [] au0828_usb_release+0x22/0x50 [au0828] [ 368.241454] [] au0828_usb_v4l2_release+0x6a/0x80 [au0828] [ 368.241460] [] v4l2_device_release+0x1b/0x20 [ 368.241464] [] v4l2_device_put+0x25/0x30 [ 368.241469] [] au0828_usb_disconnect+0xc4/0xf0 [au0828] [ 368.241474] [] usb_unbind_interface+0x86/0x270 [ 368.241479] [] ? trace_hardirqs_on+0xd/0x10 [ 368.241486] [] __device_release_driver+0xa1/0x150 [ 368.241491] [] device_release_driver+0x25/0x40 [ 368.241496] [] bus_remove_device+0x11c/0x1a0 [ 368.241501] [] device_del+0x139/0x250 [ 368.241505] [] ? remove_intf_ep_devs+0x41/0x60 [ 368.241510] [] usb_disable_device+0x89/0x270 [ 368.241514] [] usb_disconnect+0x94/0x2b0 [ 368.241518] [] hub_event+0x767/0x1580 [ 368.241523] [] ? finish_task_switch+0x52/0x1e0 [ 368.241529] [] process_one_work+0x1cf/0x540 [ 368.241534] [] ? process_one_work+0x163/0x540 [ 368.241539] [] worker_thread+0x48/0x4a0 [ 368.241544] [] ? process_one_work+0x540/0x540 [ 368.241548] [] ? process_one_work+0x540/0x540 [ 368.241552] [] kthread+0xe4/0x100 [ 368.241558] [] ? kthread_create_on_node+0x220/0x220 [ 368.241562] [] ret_from_fork+0x3f/0x70 [ 368.241567] [] ? kthread_create_on_node+0x220/0x220 [ 368.241569] Code: 00 5d c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 65 8b 35 90 ae c4 7e 0f ae f0 0f 31 89 c1 0f ae f0 <0f> 31 48 c1 e2 20 89 c0 48 09 c2 89 d0 29 ca 39 d7 76 1c f3 90 [ 396.239591] NMI watchdog: BUG: soft lockup - CPU#2 stuck for 23s! [kworker/2:1:56] [ 396.239601] Modules linked in: snd_usb_audio snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_seq snd_rawmidi ir_lirc_codec lirc_dev ir_sony_decoder ir_xmp_decoder ir_sharp_decoder ir_sanyo_decoder ir_mce_kbd_decoder snd_seq_device ir_jvc_decoder ir_rc5_decoder ir_rc6_decoder ir_nec_decoder au8522_dig tuner au8522_decoder au8522_common au0828 tveeprom nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables binfmt_misc nls_iso8859_1 kvm_amd kvm uvcvideo videobuf2_vmalloc videobuf2_memops ghash_clmulni_intel videobuf2_core aesni_intel aes_x86_64 ablk_helper cryptd lrw hp_wmi gf128mul sparse_keymap snd_hda_codec_idt glue_helper snd_hda_codec_generic snd_hda_codec_hdmi [ 396.239676] snd_hda_intel microcode snd_hda_codec hp_accel tpm_infineon snd_hda_core joydev k10temp serio_raw lis3lv02d snd_hwdep input_polldev snd_pcm tpm_tis snd_timer i2c_piix4 shpchp mac_hid parport_pc ppdev lp parport autofs4 pl2303 usbserial hid_generic radeon usbhid psmouse i2c_algo_bit hid firewire_ohci ttm firewire_core drm_kms_helper sdhci_pci crc_itu_t r8169 sdhci mii drm wmi video [ 396.239724] irq event stamp: 1850 [ 396.239727] hardirqs last enabled at (1849): [] _raw_spin_unlock_irq+0x30/0x40 [ 396.239736] hardirqs last disabled at (1850): [] _raw_spin_lock_irq+0x17/0x50 [ 396.239742] softirqs last enabled at (512): [] addrconf_verify_rtnl+0x23d/0x500 [ 396.239749] softirqs last disabled at (506): [] addrconf_verify_rtnl+0x23/0x500 [ 396.239758] CPU: 2 PID: 56 Comm: kworker/2:1 Tainted: G L 4.2.0-rc2+ #21 [ 396.239761] Hardware name: Hewlett-Packard HP ProBook 6475b/180F, BIOS 68TTU Ver. F.04 08/03/2012 [ 396.239768] Workqueue: usb_hub_wq hub_event [ 396.239772] task: ffff88021e222600 ti: ffff880218dec000 task.ti: ffff880218dec000 [ 396.239775] RIP: 0010:[] [] delay_tsc+0x15/0x50 [ 396.239782] RSP: 0018:ffff880218def938 EFLAGS: 00000206 [ 396.239785] RAX: 000000004afa4fa4 RBX: 0000000180100008 RCX: 000000004afa42a6 [ 396.239788] RDX: 00000000000000de RSI: 0000000000000002 RDI: 0000000000000001 [ 396.239791] RBP: ffff880218def938 R08: 0000000000000001 R09: 0000000000000000 [ 396.239793] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff817fe161 [ 396.239796] R13: ffffffff810d021e R14: ffffffff817fe161 R15: ffffffff810d021e [ 396.239799] FS: 00007fde9af5e940(0000) GS:ffff88023ed00000(0000) knlGS:0000000000000000 [ 396.239802] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 396.239805] CR2: 00007f21c0f55000 CR3: 0000000001e0b000 CR4: 00000000000407e0 [ 396.239807] Stack: [ 396.239809] ffff880218def948 ffffffff813bf20f ffff880218def978 ffffffff810b428c [ 396.239815] ffff88008ced0d70 ffff88008ced0d70 ffff880231f1f800 ffff880231f1fd40 [ 396.239820] ffff880218def9a8 ffffffff817fca99 ffffffff8160f70b ffffffff8160f844 [ 396.239825] Call Trace: [ 396.239833] [] __delay+0xf/0x20 [ 396.239839] [] do_raw_spin_lock+0x8c/0x150 [ 396.239844] [] _raw_spin_lock+0x39/0x40 [ 396.239850] [] ? media_device_unregister_entity+0x3b/0x130 [ 396.239855] [] ? media_device_unregister+0x44/0x120 [ 396.239859] [] media_device_unregister_entity+0x3b/0x130 [ 396.239864] [] media_device_unregister+0xba/0x120 [ 396.239872] [] au0828_usb_release+0x22/0x50 [au0828] [ 396.239878] [] au0828_usb_v4l2_release+0x6a/0x80 [au0828] [ 396.239883] [] v4l2_device_release+0x1b/0x20 [ 396.239887] [] v4l2_device_put+0x25/0x30 [ 396.239892] [] au0828_usb_disconnect+0xc4/0xf0 [au0828] [ 396.239898] [] usb_unbind_interface+0x86/0x270 [ 396.239902] [] ? trace_hardirqs_on+0xd/0x10 [ 396.239909] [] __device_release_driver+0xa1/0x150 [ 396.239914] [] device_release_driver+0x25/0x40 [ 396.239919] [] bus_remove_device+0x11c/0x1a0 [ 396.239924] [] device_del+0x139/0x250 [ 396.239929] [] ? remove_intf_ep_devs+0x41/0x60 [ 396.239933] [] usb_disable_device+0x89/0x270 [ 396.239937] [] usb_disconnect+0x94/0x2b0 [ 396.239941] [] hub_event+0x767/0x1580 [ 396.239946] [] ? finish_task_switch+0x52/0x1e0 [ 396.239953] [] process_one_work+0x1cf/0x540 [ 396.239957] [] ? process_one_work+0x163/0x540 [ 396.239962] [] worker_thread+0x48/0x4a0 [ 396.239967] [] ? process_one_work+0x540/0x540 [ 396.239971] [] ? process_one_work+0x540/0x540 [ 396.239976] [] kthread+0xe4/0x100 [ 396.239981] [] ? kthread_create_on_node+0x220/0x220 [ 396.239986] [] ret_from_fork+0x3f/0x70 [ 396.239990] [] ? kthread_create_on_node+0x220/0x220 [ 396.239992] Code: ff 15 68 bb ae 00 5d c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 65 8b 35 90 ae c4 7e 0f ae f0 0f 31 <89> c1 0f ae f0 0f 31 48 c1 e2 20 89 c0 48 09 c2 89 d0 29 ca 39 [ 424.238131] NMI watchdog: BUG: soft lockup - CPU#2 stuck for 23s! [kworker/2:1:56] [ 424.238143] Modules linked in: snd_usb_audio snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_seq snd_rawmidi ir_lirc_codec lirc_dev ir_sony_decoder ir_xmp_decoder ir_sharp_decoder ir_sanyo_decoder ir_mce_kbd_decoder snd_seq_device ir_jvc_decoder ir_rc5_decoder ir_rc6_decoder ir_nec_decoder au8522_dig tuner au8522_decoder au8522_common au0828 tveeprom nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables binfmt_misc nls_iso8859_1 kvm_amd kvm uvcvideo videobuf2_vmalloc videobuf2_memops ghash_clmulni_intel videobuf2_core aesni_intel aes_x86_64 ablk_helper cryptd lrw hp_wmi gf128mul sparse_keymap snd_hda_codec_idt glue_helper snd_hda_codec_generic snd_hda_codec_hdmi [ 424.238218] snd_hda_intel microcode snd_hda_codec hp_accel tpm_infineon snd_hda_core joydev k10temp serio_raw lis3lv02d snd_hwdep input_polldev snd_pcm tpm_tis snd_timer i2c_piix4 shpchp mac_hid parport_pc ppdev lp parport autofs4 pl2303 usbserial hid_generic radeon usbhid psmouse i2c_algo_bit hid firewire_ohci ttm firewire_core drm_kms_helper sdhci_pci crc_itu_t r8169 sdhci mii drm wmi video [ 424.238267] irq event stamp: 1850 [ 424.238270] hardirqs last enabled at (1849): [] _raw_spin_unlock_irq+0x30/0x40 [ 424.238280] hardirqs last disabled at (1850): [] _raw_spin_lock_irq+0x17/0x50 [ 424.238286] softirqs last enabled at (512): [] addrconf_verify_rtnl+0x23d/0x500 [ 424.238293] softirqs last disabled at (506): [] addrconf_verify_rtnl+0x23/0x500 [ 424.238302] CPU: 2 PID: 56 Comm: kworker/2:1 Tainted: G L 4.2.0-rc2+ #21 [ 424.238306] Hardware name: Hewlett-Packard HP ProBook 6475b/180F, BIOS 68TTU Ver. F.04 08/03/2012 [ 424.238312] Workqueue: usb_hub_wq hub_event [ 424.238316] task: ffff88021e222600 ti: ffff880218dec000 task.ti: ffff880218dec000 [ 424.238319] RIP: 0010:[] [] delay_tsc+0x1c/0x50 [ 424.238327] RSP: 0018:ffff880218def938 EFLAGS: 00000202 [ 424.238330] RAX: 000000004294e518 RBX: 0000000180100008 RCX: 000000004294d8ed [ 424.238333] RDX: 00000000000000ed RSI: 0000000000000002 RDI: 0000000000000001 [ 424.238335] RBP: ffff880218def938 R08: 0000000000000001 R09: 0000000000000000 [ 424.238338] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff817fe161 [ 424.238340] R13: ffffffff810d021e R14: ffffffff817fe161 R15: ffffffff810d021e [ 424.238344] FS: 00007fde9af5e940(0000) GS:ffff88023ed00000(0000) knlGS:0000000000000000 [ 424.238347] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 424.238350] CR2: 00007f21c0f55000 CR3: 0000000001e0b000 CR4: 00000000000407e0 [ 424.238352] Stack: [ 424.238354] ffff880218def948 ffffffff813bf20f ffff880218def978 ffffffff810b428c [ 424.238360] ffff88008ced0d70 ffff88008ced0d70 ffff880231f1f800 ffff880231f1fd40 [ 424.238365] ffff880218def9a8 ffffffff817fca99 ffffffff8160f70b ffffffff8160f844 [ 424.238370] Call Trace: [ 424.238377] [] __delay+0xf/0x20 [ 424.238384] [] do_raw_spin_lock+0x8c/0x150 [ 424.238388] [] _raw_spin_lock+0x39/0x40 [ 424.238394] [] ? media_device_unregister_entity+0x3b/0x130 [ 424.238399] [] ? media_device_unregister+0x44/0x120 [ 424.238403] [] media_device_unregister_entity+0x3b/0x130 [ 424.238407] [] media_device_unregister+0xba/0x120 [ 424.238416] [] au0828_usb_release+0x22/0x50 [au0828] [ 424.238421] [] au0828_usb_v4l2_release+0x6a/0x80 [au0828] [ 424.238427] [] v4l2_device_release+0x1b/0x20 [ 424.238431] [] v4l2_device_put+0x25/0x30 [ 424.238436] [] au0828_usb_disconnect+0xc4/0xf0 [au0828] [ 424.238441] [] usb_unbind_interface+0x86/0x270 [ 424.238446] [] ? trace_hardirqs_on+0xd/0x10 [ 424.238453] [] __device_release_driver+0xa1/0x150 [ 424.238457] [] device_release_driver+0x25/0x40 [ 424.238463] [] bus_remove_device+0x11c/0x1a0 [ 424.238467] [] device_del+0x139/0x250 [ 424.238472] [] ? remove_intf_ep_devs+0x41/0x60 [ 424.238476] [] usb_disable_device+0x89/0x270 [ 424.238480] [] usb_disconnect+0x94/0x2b0 [ 424.238484] [] hub_event+0x767/0x1580 [ 424.238490] [] ? finish_task_switch+0x52/0x1e0 [ 424.238496] [] process_one_work+0x1cf/0x540 [ 424.238500] [] ? process_one_work+0x163/0x540 [ 424.238505] [] worker_thread+0x48/0x4a0 [ 424.238510] [] ? process_one_work+0x540/0x540 [ 424.238514] [] ? process_one_work+0x540/0x540 [ 424.238518] [] kthread+0xe4/0x100 [ 424.238524] [] ? kthread_create_on_node+0x220/0x220 [ 424.238528] [] ret_from_fork+0x3f/0x70 [ 424.238533] [] ? kthread_create_on_node+0x220/0x220 [ 424.238535] Code: c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 65 8b 35 90 ae c4 7e 0f ae f0 0f 31 89 c1 0f ae f0 0f 31 <48> c1 e2 20 89 c0 48 09 c2 89 d0 29 ca 39 d7 76 1c f3 90 65 8b -- Shuah Khan Sr. Linux Kernel Developer Open Source Innovation Group Samsung Research America (Silicon Valley) shuahkh@osg.samsung.com | (970) 217-8978