If I try to enable Bluetooth tethering the system UI crashes and the lock screen is shown again, Bluetooth tethering being disabled.
Bluetooth itself seems to work, at least it does find/show devices.
I guess this is a FP3 bug.
Already reported to support.
It doesn’t seem to be a universal bug. I can activate the Bluetooth tethering switch without any side effects.
Created some logcat logs and this looks interesting:
02-10 20:21:52.625 3920 3920 E QCOMSysDaemon: Can't find/open bootselect node: (No such file or directory)
02-10 20:21:52.625 3920 3920 I QCOMSysDaemon: Starting qcom system daemon
02-10 20:21:52.610 3920 3920 W qcom-system-dae: type=1400 audit(0.0:725): avc: denied { read write } for name="diag" dev="tmpfs" ino=14714 scontext=u:r:vendor_qcomsysd:s0 tcontext=u:object_r:diag_device:s0 tclass=chr_file permissive=0
02-10 20:21:52.625 3920 3920 E Diag_Lib: Diag_LSM_Init: Failed to open handle to diag driver, error = 13
02-10 20:21:52.625 3920 3920 E QCOMSysDaemon: Diag_LSM_Init failed : 0
02-10 20:21:52.899 1871 1871 I ConnectivityManager: startTethering caller:com.android.settings
02-10 20:21:52.905 474 474 W hwservicemanager: getTransport: Cannot find entry vendor.qti.hardware.servicetracker@1.0::IServicetracker/default in either framework or device manifest.
02-10 20:21:52.906 1214 1214 D BluetoothPan: BluetoothPAN Proxy object connected
02-10 20:21:52.907 1214 1214 D BluetoothPan: setBluetoothTethering(true)
02-10 20:21:52.910 1666 1691 D PanService: setBluetoothTethering: true, mTetherOn: false
02-10 20:21:52.914 1214 1214 E Zygote : System zygote died with exception
02-10 20:21:52.914 1214 1214 E Zygote : java.lang.SecurityException: com.android.bluetooth was not granted this permission: android.permission.WRITE_SETTINGS.
02-10 20:21:52.914 1214 1214 E Zygote : at android.os.Parcel.createException(Parcel.java:1950)
02-10 20:21:52.914 1214 1214 E Zygote : at android.os.Parcel.readException(Parcel.java:1918)
02-10 20:21:52.914 1214 1214 E Zygote : at android.os.Parcel.readException(Parcel.java:1868)
02-10 20:21:52.914 1214 1214 E Zygote : at android.bluetooth.IBluetoothPan$Stub$Proxy.setBluetoothTethering(IBluetoothPan.java:179)
02-10 20:21:52.914 1214 1214 E Zygote : at android.bluetooth.BluetoothPan.setBluetoothTethering(BluetoothPan.java:356)
02-10 20:21:52.914 1214 1214 E Zygote : at com.android.server.connectivity.Tethering$1.onServiceConnected(Tethering.java:503)
02-10 20:21:52.914 1214 1214 E Zygote : at android.bluetooth.BluetoothPan$2.onServiceConnected(BluetoothPan.java:381)
02-10 20:21:52.914 1214 1214 E Zygote : at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1730)
02-10 20:21:52.914 1214 1214 E Zygote : at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1762)
02-10 20:21:52.914 1214 1214 E Zygote : at android.os.Handler.handleCallback(Handler.java:873)
02-10 20:21:52.914 1214 1214 E Zygote : at android.os.Handler.dispatchMessage(Handler.java:99)
02-10 20:21:52.914 1214 1214 E Zygote : at android.os.Looper.loop(Looper.java:193)
02-10 20:21:52.914 1214 1214 E Zygote : at com.android.server.SystemServer.run(SystemServer.java:466)
02-10 20:21:52.914 1214 1214 E Zygote : at com.android.server.SystemServer.main(SystemServer.java:302)
02-10 20:21:52.914 1214 1214 E Zygote : at java.lang.reflect.Method.invoke(Native Method)
02-10 20:21:52.914 1214 1214 E Zygote : at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
02-10 20:21:52.914 1214 1214 E Zygote : at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:838)
02-10 20:21:52.914 1214 1214 D AndroidRuntime: Shutting down VM
--------- beginning of crash
02-10 20:21:52.915 1214 1214 E AndroidRuntime: *** FATAL EXCEPTION IN SYSTEM PROCESS: main
02-10 20:21:52.915 1214 1214 E AndroidRuntime: java.lang.SecurityException: com.android.bluetooth was not granted this permission: android.permission.WRITE_SETTINGS.
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at android.os.Parcel.createException(Parcel.java:1950)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at android.os.Parcel.readException(Parcel.java:1918)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at android.os.Parcel.readException(Parcel.java:1868)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at android.bluetooth.IBluetoothPan$Stub$Proxy.setBluetoothTethering(IBluetoothPan.java:179)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at android.bluetooth.BluetoothPan.setBluetoothTethering(BluetoothPan.java:356)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at com.android.server.connectivity.Tethering$1.onServiceConnected(Tethering.java:503)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at android.bluetooth.BluetoothPan$2.onServiceConnected(BluetoothPan.java:381)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1730)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1762)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:873)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at android.os.Looper.loop(Looper.java:193)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at com.android.server.SystemServer.run(SystemServer.java:466)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at com.android.server.SystemServer.main(SystemServer.java:302)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
02-10 20:21:52.915 1214 1214 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:838)
02-10 20:21:52.947 1214 1214 W ContextImpl: Calling a method in the system process without a qualified user: android.app.ContextImpl.sendBroadcast:1005 com.android.server.am.ActivityManagerService.handleApplicationCrashInner:15582 com.android.server.am.ActivityManagerService.handleApplicationCrash:15560 com.android.internal.os.RuntimeInit$KillApplicationHandler.uncaughtException:143 java.lang.ThreadGroup.uncaughtException:1068
02-10 20:21:52.948 1214 1214 E ActivityManager: Sending non-protected broadcast com.arima.oem.SYSTEM_CRASH from system 1214:system/1000 pkg android
02-10 20:21:52.948 1214 1214 E ActivityManager: java.lang.Throwable
02-10 20:21:52.948 1214 1214 E ActivityManager: at com.android.server.am.ActivityManagerService.checkBroadcastFromSystem(ActivityManagerService.java:21388)
02-10 20:21:52.948 1214 1214 E ActivityManager: at com.android.server.am.ActivityManagerService.broadcastIntentLocked(ActivityManagerService.java:21992)
02-10 20:21:52.948 1214 1214 E ActivityManager: at com.android.server.am.ActivityManagerService.broadcastIntent(ActivityManagerService.java:22134)
02-10 20:21:52.948 1214 1214 E ActivityManager: at android.app.ContextImpl.sendBroadcast(ContextImpl.java:1009)
02-10 20:21:52.948 1214 1214 E ActivityManager: at com.android.server.am.ActivityManagerService.handleApplicationCrashInner(ActivityManagerService.java:15582)
02-10 20:21:52.948 1214 1214 E ActivityManager: at com.android.server.am.ActivityManagerService.handleApplicationCrash(ActivityManagerService.java:15560)
02-10 20:21:52.948 1214 1214 E ActivityManager: at com.android.internal.os.RuntimeInit$KillApplicationHandler.uncaughtException(RuntimeInit.java:143)
02-10 20:21:52.948 1214 1214 E ActivityManager: at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:1068)
02-10 20:21:52.948 1214 1214 E ActivityManager: at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:1063)
02-10 20:21:52.948 1214 1214 E ActivityManager: at java.lang.Thread.dispatchUncaughtException(Thread.java:1955)
I did check in the settings and the “Bluetooth” app does not ask for any permissions.
Also reporting this to support.
So finally I could fix it. In the end, the issue just was that the app “Bluetooth” was missing a permission to change the system settings.
You need to grant this permission to the app in this way:
Afterwards, it just works. At least enabling. 
Anyway, it would be nice if Fairphone could fix that crash or report it to those responsible for that.
Because in such a case the app should show an error instead of crashing the whole system UI.
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