Hi, *Sorry I forgot to turn HTML off in my previous message. Resending it again. I have a Bluedio T+3 Bluetooth Headset that contains the HSP/HFP, A2DP and AVRCP profiles. I am using kernel version 4.1.27 with BlueZ 5.40. I have paired with the headset using bluetoothctl. After I have paired with the device, I receive kernel oops message in the console. Nonetheless, the system does not crash and I was able to configure it to play audio. Hence, it is a soft kernel panic. There are no issues to the Bluetooth audio streaming. The steps that I have taken are as follows: $ pulseaudio -D $ bluetoothctl $ scan on (search for Bluetooth addresses) $ pair <BT_HEADSET_MAC> $ connect <BT_HEADSET_MAC> (from this point on, the kernel displays kernel oops messages) Please see the output as follows: Kernel oops message (notice the segfault): [ 1611.091465] pulseaudio[1270]: segfault at 694be0 ip 0000000000694be0 sp 00007ffe1b0b0158 error 15 [ 1627.873788] input: 16:01:14:24:15:59 as /devices/virtual/input/input9 [ 1627.892687] ------------[ cut here ]------------ [ 1627.899990] WARNING: CPU: 3 PID: 438 at /home/ilab/development/yocto_build/build/tmp/work-shared/intel-corei7-64-cavs-hda/kernel-source/lib/debugobjects.c:263 debug_print_object+0x89/0xb0() [ 1627.921000] ODEBUG: assert_init not available (active state 0) object type: timer_list hint: stub_timer+0x0/0x20 [ 1627.934530] Modules linked in: uinput 8021q cmac ecb rfcomm bnep snd_hda_codec_hdmi fuse btusb btbcm btintel bluetooth hid_sensor_gyro_3d hid_sensor_als hid_sensor_accel_3d hid_sensor_press hid_sensor_incl_3d hid_sensor_trigger hid_sensor_iio_common hid_sensor_custom hid_sensor_hub mei_dal intel_spi_platform intel_spi sbi_apl intel_ishtp_hid mwifiex_usb mwifiex_pcie mwifiex cfg80211 i915 iTCO_wdt igb pcspkr iTCO_vendor_support lpc_ich spi_pxa2xx_platform mei_me mei portmux_intel_drcfg i2c_i801 snd_hda_intel snd_hda_codec dca snd_hda_core intel_ish_ipc intel_ishtp thermal tpm_crb tpm_tis tpm intel_pmc_ipc rtc_cmos [ 1628.002994] CPU: 3 PID: 438 Comm: kworker/u9:11 Tainted: G U W 4.1.27apollolake #2 [ 1628.015045] Hardware name: Intel Corp. Broxton P/NOTEBOOK, BIOS APLIRVPA.X64.0138.B35.1608091058 08/09/2016 [ 1628.028488] Workqueue: hci0 hci_rx_work [bluetooth] [ 1628.036435] 0000000000000086 00000000f240fc38 ffff880004bdf828 ffffffff81a738a5 [ 1628.047265] ffff880004bdf880 ffffffff81f2e1a8 ffff880004bdf868 ffffffff81081e0a [ 1628.058104] 0000000000000096 ffff880004bdf928 ffffffff82241280 ffffffff81f2d1cb [ 1628.068989] Call Trace: [ 1628.074303] [<ffffffff81a738a5>] dump_stack+0x4d/0x63 [ 1628.082616] [<ffffffff81081e0a>] warn_slowpath_common+0x8a/0xc0 [ 1628.091874] [<ffffffff81081e95>] warn_slowpath_fmt+0x55/0x70 [ 1628.100863] [<ffffffff810f39ab>] ? init_timer_key+0x6b/0xd0 [ 1628.109753] [<ffffffff814bf8d9>] debug_print_object+0x89/0xb0 [ 1628.118864] [<ffffffff810f3850>] ? ftrace_raw_event_tick_stop+0x100/0x100 [ 1628.129118] [<ffffffff814c0934>] debug_object_assert_init+0x144/0x150 [ 1628.138971] [<ffffffff810f4003>] del_timer+0x33/0xa0 [ 1628.147195] [<ffffffff8109bb89>] try_to_grab_pending+0xa9/0x160 [ 1628.156456] [<ffffffff8109c3e3>] cancel_delayed_work+0x33/0xe0 [ 1628.165573] [<ffffffffa059b24c>] l2cap_chan_del+0x19c/0x340 [bluetooth] [ 1628.175541] [<ffffffffa059b59d>] l2cap_connect_create_rsp+0x1ad/0x290 [bluetooth] [ 1628.186471] [<ffffffffa05a4190>] ? l2cap_sig_channel+0x70/0x1390 [bluetooth] [ 1628.196942] [<ffffffffa05a474c>] l2cap_sig_channel+0x62c/0x1390 [bluetooth] [ 1628.207340] [<ffffffffa056ef78>] ? hci_rx_work+0x148/0x4a0 [bluetooth] [ 1628.217221] [<ffffffffa05a5703>] l2cap_recv_frame+0x253/0x370 [bluetooth] [ 1628.227420] [<ffffffffa05a646b>] l2cap_recv_acldata+0x33b/0x380 [bluetooth] [ 1628.237754] [<ffffffffa056f01e>] hci_rx_work+0x1ee/0x4a0 [bluetooth] [ 1628.247402] [<ffffffffa056ef62>] ? hci_rx_work+0x132/0x4a0 [bluetooth] [ 1628.257264] [<ffffffff8109c957>] process_one_work+0x217/0x5c0 [ 1628.266265] [<ffffffff8109c8b9>] ? process_one_work+0x179/0x5c0 [ 1628.275441] [<ffffffff8109cdc7>] ? worker_thread+0xc7/0x460 [ 1628.284241] [<ffffffff8109cd4b>] worker_thread+0x4b/0x460 [ 1628.292847] [<ffffffff8109cd00>] ? process_one_work+0x5c0/0x5c0 [ 1628.301998] [<ffffffff810a27d9>] kthread+0xf9/0x110 [ 1628.310049] [<ffffffff810b50b5>] ? local_clock+0x25/0x30 [ 1628.318542] [<ffffffff810a26e0>] ? kthread_create_on_node+0x250/0x250 [ 1628.328315] [<ffffffff81a7d0e2>] ret_from_fork+0x42/0x70 [ 1628.336806] [<ffffffff810a26e0>] ? kthread_create_on_node+0x250/0x250 [ 1628.346605] ---[ end trace 0b6559d32b2a5c31 ]--- [ 1628.354291] ------------[ cut here ]------------ [ 1628.361929] WARNING: CPU: 3 PID: 438 at /home/ilab/development/yocto_build/build/tmp/work-shared/intel-corei7-64-cavs-hda/kernel-source/lib/debugobjects.c:263 debug_print_object+0x89/0xb0() [ 1628.383395] ODEBUG: assert_init not available (active state 0) object type: timer_list hint: stub_timer+0x0/0x20 [ 1628.397426] Modules linked in: uinput 8021q cmac ecb rfcomm bnep snd_hda_codec_hdmi fuse btusb btbcm btintel bluetooth hid_sensor_gyro_3d hid_sensor_als hid_sensor_accel_3d hid_sensor_press hid_sensor_incl_3d hid_sensor_trigger hid_sensor_iio_common hid_sensor_custom hid_sensor_hub mei_dal intel_spi_platform intel_spi sbi_apl intel_ishtp_hid mwifiex_usb mwifiex_pcie mwifiex cfg80211 i915 iTCO_wdt igb pcspkr iTCO_vendor_support lpc_ich spi_pxa2xx_platform mei_me mei portmux_intel_drcfg i2c_i801 snd_hda_intel snd_hda_codec dca snd_hda_core intel_ish_ipc intel_ishtp thermal tpm_crb tpm_tis tpm intel_pmc_ipc rtc_cmos [ 1628.467217] CPU: 3 PID: 438 Comm: kworker/u9:11 Tainted: G U W 4.1.27apollolake #2 [ 1628.479683] Hardware name: Intel Corp. Broxton P/NOTEBOOK, BIOS APLIRVPA.X64.0138.B35.1608091058 08/09/2016 [ 1628.493584] Workqueue: hci0 hci_rx_work [bluetooth] [ 1628.502029] 0000000000000086 00000000f240fc38 ffff880004bdf828 ffffffff81a738a5 [ 1628.513307] ffff880004bdf880 ffffffff81f2e1a8 ffff880004bdf868 ffffffff81081e0a [ 1628.524574] 0000000000000096 ffff880004bdf928 ffffffff82241280 ffffffff81f2d1cb [ 1628.535925] Call Trace: [ 1628.541714] [<ffffffff81a738a5>] dump_stack+0x4d/0x63 [ 1628.550492] [<ffffffff81081e0a>] warn_slowpath_common+0x8a/0xc0 [ 1628.560242] [<ffffffff81081e95>] warn_slowpath_fmt+0x55/0x70 [ 1628.569690] [<ffffffff810f39ab>] ? init_timer_key+0x6b/0xd0 [ 1628.579041] [<ffffffff814bf8d9>] debug_print_object+0x89/0xb0 [ 1628.588580] [<ffffffff810f3850>] ? ftrace_raw_event_tick_stop+0x100/0x100 [ 1628.599315] [<ffffffff814c0934>] debug_object_assert_init+0x144/0x150 [ 1628.609646] [<ffffffff810f4003>] del_timer+0x33/0xa0 [ 1628.618358] [<ffffffff8109bb89>] try_to_grab_pending+0xa9/0x160 [ 1628.628229] [<ffffffff8109c3e3>] cancel_delayed_work+0x33/0xe0 [ 1628.637970] [<ffffffffa059b260>] l2cap_chan_del+0x1b0/0x340 [bluetooth] [ 1628.648624] [<ffffffffa059b59d>] l2cap_connect_create_rsp+0x1ad/0x290 [bluetooth] [ 1628.660266] [<ffffffffa05a4190>] ? l2cap_sig_channel+0x70/0x1390 [bluetooth] [ 1628.671445] [<ffffffffa05a474c>] l2cap_sig_channel+0x62c/0x1390 [bluetooth] [ 1628.682448] [<ffffffffa056ef78>] ? hci_rx_work+0x148/0x4a0 [bluetooth] [ 1628.692953] [<ffffffffa05a5703>] l2cap_recv_frame+0x253/0x370 [bluetooth] [ 1628.703720] [<ffffffffa05a646b>] l2cap_recv_acldata+0x33b/0x380 [bluetooth] [ 1628.714701] [<ffffffffa056f01e>] hci_rx_work+0x1ee/0x4a0 [bluetooth] [ 1628.724899] [<ffffffffa056ef62>] ? hci_rx_work+0x132/0x4a0 [bluetooth] [ 1628.735263] [<ffffffff8109c957>] process_one_work+0x217/0x5c0 [ 1628.744690] [<ffffffff8109c8b9>] ? process_one_work+0x179/0x5c0 [ 1628.754238] [<ffffffff8109cdc7>] ? worker_thread+0xc7/0x460 [ 1628.763319] [<ffffffff8109cd4b>] worker_thread+0x4b/0x460 [ 1628.772118] [<ffffffff8109cd00>] ? process_one_work+0x5c0/0x5c0 [ 1628.781388] [<ffffffff810a27d9>] kthread+0xf9/0x110 [ 1628.789423] [<ffffffff810b50b5>] ? local_clock+0x25/0x30 [ 1628.797900] [<ffffffff810a26e0>] ? kthread_create_on_node+0x250/0x250 [ 1628.807628] [<ffffffff81a7d0e2>] ret_from_fork+0x42/0x70 [ 1628.816071] [<ffffffff810a26e0>] ? kthread_create_on_node+0x250/0x250 [ 1628.825822] ---[ end trace 0b6559d32b2a5c32 ]--- Strangely, when I tried to connect to another device i.e. Bluetooth speaker that only has A2DP, the kernel oops message did not appear. This lead me to some findings which I found in the following link. They encounter crashing/segfault when connecting to a Samsung Gear Circle. This was the closest to my issue. The difference being is that I do not encounter any crashes in the Linux system. http://thread.gmane.org/gmane.linux.bluez.kernel/60329 May I know how can I narrow down to find the root cause of this issue and also to prevent this from happening? Thank you. Best regards, Joshua -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
