Hi Pavel, > I'm getting this at boot: > > [ 7.984584] *pdpt = 0000000033a31001 *pde = 0000000000000000 > [ 7.984584] Oops: 0000 [#1] PREEMPT SMP PTI > [ 7.984584] CPU: 1 PID: 2532 Comm: systemd-udevd Not tainted > 5.8.0-rc2-next-20200623+ #126 > [ 7.998580] Hardware name: LENOVO 17097HU/17097HU, BIOS 7BETD8WW > (2.19 ) 03/31/2011 > [ 8.000592] EIP: __queue_work+0x139/0x320 > [ 8.000592] Code: 90 83 7d f0 08 0f 84 b6 00 00 00 8b 45 ec 8b 9f > 04 01 00 00 03 1c 85 40 63 1f c5 89 f0 e8 df f8 ff ff 85 c0 0f 85 4f > ff ff ff <8b> 03 e9 50 ff ff ff 89 45 e4 e8 48 0a cb 00 8b 4d e8 8b 45 > e4 8b > [ 8.007883] EAX: 00000000 EBX: 00000000 ECX: 47d88848 EDX: 03ffffff > [ 8.007883] ESI: f4a348bc EDI: f492a600 EBP: f3b1dd0c ESP: f3b1dcf0 > [ 8.019981] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: > 00010046 > [ 8.023156] CR0: 80050033 CR2: 00000000 CR3: 33b1e000 CR4: 000006b0 > [ 8.028892] Call Trace: > [ 8.034199] queue_work_on+0x1d/0x30 > [ 8.034199] hci_adv_monitors_clear+0x5c/0x80 > [ 8.042158] hci_unregister_dev+0x161/0x2f0 > [ 8.042158] ? usb_disable_endpoint+0x94/0xa0 > [ 8.042158] btusb_disconnect+0x4b/0x120 > [ 8.057018] usb_unbind_interface+0x64/0x230 > [ 8.057018] device_release_driver_internal+0xc1/0x180 > [ 8.065196] device_release_driver+0xc/0x10 > [ 8.068040] bus_remove_device+0xa8/0x110 > [ 8.071767] device_del+0x126/0x370 > [ 8.071767] ? usb_remove_ep_devs+0x15/0x20 > [ 8.079199] ? remove_intf_ep_devs+0x30/0x50 > [ 8.081371] usb_disable_device+0x8e/0x240 > [ 8.087478] usb_set_configuration+0x47c/0x800 > [ 8.087478] usb_deauthorize_device+0x36/0x50 > [ 8.092662] authorized_store+0x5d/0x70 > [ 8.096608] ? authorized_default_store+0x60/0x60 > [ 8.096608] dev_attr_store+0x13/0x20 > [ 8.096608] ? component_bind_all.cold+0x52/0x52 > [ 8.106151] sysfs_kf_write+0x2f/0x50 > [ 8.106151] ? sysfs_file_ops+0x50/0x50 > [ 8.106151] kernfs_fop_write+0x105/0x1a0 > [ 8.106151] ? kernfs_fop_open+0x3c0/0x3c0 > [ 8.106151] __vfs_write+0x2b/0x1e0 > [ 8.106151] ? lock_acquire+0x3f/0x70 > [ 8.106151] ? vfs_write+0x12a/0x180 > [ 8.106151] ? __sb_start_write+0xd6/0x180 > [ 8.106151] ? vfs_write+0x12a/0x180 > [ 8.106151] vfs_write+0xa1/0x180 > [ 8.106151] ksys_write+0x5c/0xd0 > [ 8.106151] __ia32_sys_write+0x10/0x20 > [ 8.106151] do_syscall_32_irqs_on+0x3a/0xf0 > [ 8.106151] do_int80_syscall_32+0x9/0x20 > [ 8.106151] entry_INT80_32+0x116/0x116 > [ 8.106151] EIP: 0xb7f45092 > [ 8.106151] Code: Bad RIP value. > [ 8.146079] EAX: ffffffda EBX: 00000007 ECX: 004fb760 EDX: 00000001 > [ 8.146079] ESI: 004fb760 EDI: 00000001 EBP: 004c79f0 ESP: bfabc48c > [ 8.146079] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: > 00000246 > [ 8.150364] Modules linked in: > [ 8.150364] CR2: 0000000000000000 > [ 8.150364] ---[ end trace 468d097aaf220284 ]--- I assume this is caused by commit e5e1e7fd470ccf2eb38ab7fb5a3ab0fc4792fe53 and mainly because it triggers the background scan workqueue. I think we need to distinguish clearing the monitors when removing the controller compared to clearing the controllers from bluetoothd as a runtime operation. Regards Marcel
