Xamarin iOS Crash with Twilio Client - twilio

Question

I have a crash in a Xamarin app that is using the Twilio Client Component. I use the "Getting Started" code to make a simple app that makes a phone call out when I click a button. From the crash log I see a reference to "CRASHING_DUE_TO_PRIVACY_VIOLATION" in the call stack. I don't know what that could be as I have "Audio and Airplay" and "Voice over IP" check in background modes in my apps plist file.
The odd thing in in simulator it works perfect, the crash only occurs when I run the app on the iPhone. My phone is running ios 10.2. I am including the code and the crash log. Please help as this crash occurs exactly the same way in an app I am building for work so I really need to solve it and I am at my wits end.
using System;
using UIKit;
using Foundation;
using TwilioClient.iOS;
namespace twiliotest
{
public partial class ViewController : UIViewController
{
TCDevice _device;
TCConnection _connection;
protected ViewController(IntPtr handle) : base(handle)
{
// Note: this .ctor should not contain any initialization logic.
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
string sLink = "https://www.myserver.com/captok.php";
var url = new NSUrl(sLink);
var data = NSData.FromUrl(url);
var token = data.ToString();
// Create a new TCDevice object passing in the token.
_device = new TCDevice(token, null);
}
public override void DidReceiveMemoryWarning()
{
base.DidReceiveMemoryWarning();
}
partial void ButtonCall_TouchUpInside(UIButton sender)
{
if (_connection == null || _connection.State == TCConnectionState.Disconnected)
{
var param = new TCConnectionParameters
{
From = "12125551234",
To = "12125554321"
};
_connection = _device.Connect(param, null);
}
else {
_connection.Disconnect();
}
}
void SetupDeviceEvents()
{
if (_device != null)
{
_device.ReceivedIncomingConnection += (sender, e) =>
{
_connection = e.Connection;
_connection.Accept();
};
}
}
}
}
Here is the crash log. Note the crash is in thread 7.
Incident Identifier: FA61C36F-110A-44DF-A862-FD7C37859D8E
CrashReporter Key: dc2811c1cf8685a6f8963c39740ec1af0fb4e080
Hardware Model: iPhone7,2
Process: twiliotest [7846]
Path: /private/var/containers/Bundle/Application/412D52E2-9ECB-4C01-B984-AB2820FBBFB0/twiliotest.app/twiliotest
Identifier: com.davidkbowers.twiliotest
Version: 1.0 (1.0)
Code Type: ARM-64 (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: com.davidkbowers.twiliotest [1855]
Date/Time: 2017-01-04 18:50:06.7079 -0500
Launch Time: 2017-01-04 18:50:00.8968 -0500
OS Version: iPhone OS 10.2 (14C92)
Report Version: 104
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Triggered by Thread: 7
Application Specific Information:
abort() called
Filtered syslog:
None found
Thread 0 name: tid_403 Dispatch queue: com.apple.main-thread
Thread 0:
0 libsystem_kernel.dylib 0x00000001822c5188 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001822c4ff8 mach_msg + 72
2 CoreFoundation 0x00000001832c25d0 __CFRunLoopServiceMachPort + 192
3 CoreFoundation 0x00000001832c01ec __CFRunLoopRun + 1132
4 CoreFoundation 0x00000001831ee2b8 CFRunLoopRunSpecific + 444
5 GraphicsServices 0x0000000184ca2198 GSEventRunModal + 180
6 UIKit 0x00000001892357fc -[UIApplication _run] + 684
7 UIKit 0x0000000189230534 UIApplicationMain + 208
8 twiliotest 0x000000010047cd04 wrapper_managed_to_native_UIKit_UIApplication_UIApplicationMain_int_string___intptr_intptr (/<unknown>:1)
9 twiliotest 0x0000000100462a9c UIKit_UIApplication_Main_string___intptr_intptr (UIApplication.cs:79)
10 twiliotest 0x0000000100462a5c UIKit_UIApplication_Main_string___string_string (UIApplication.cs:63)
11 twiliotest 0x0000000100438e04 twiliotest_Application_Main_string__ (Main.cs:12)
12 twiliotest 0x000000010059bb64 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 244
13 twiliotest 0x000000010032ee28 mono_jit_runtime_invoke (mini-runtime.c:2524)
14 twiliotest 0x000000010039d1e8 do_runtime_invoke (object.c:2809)
15 twiliotest 0x000000010039f7cc mono_runtime_exec_main (object.c:4585)
16 twiliotest 0x000000010039f3e8 mono_runtime_run_main (object.c:4134)
17 twiliotest 0x0000000100314050 mono_jit_exec (driver.g.c:1048)
18 twiliotest 0x0000000100438bd0 xamarin_main (monotouch-main.m:487)
19 twiliotest 0x00000001005ec148 main (main.arm64.m:45)
20 libdyld.dylib 0x00000001821d15b8 start + 4
Thread 1:
0 libsystem_kernel.dylib 0x00000001822e3a88 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x00000001823a7344 _pthread_wqthread + 1452
2 libsystem_pthread.dylib 0x00000001823a6d8c start_wqthread + 4
Thread 2:
0 libsystem_pthread.dylib 0x00000001823a6d88 start_wqthread + 0
Thread 3 name: Dispatch queue: com.twilio.TCCommandHandler.commandQ
Thread 3:
0 libsystem_kernel.dylib 0x00000001822c5188 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001822c4ff8 mach_msg + 72
2 AudioToolbox 0x0000000186313c90 AUIOClient_Initialize + 228
3 AudioToolbox 0x00000001861a1864 AURemoteIO::Initialize() + 1328
4 AudioToolbox 0x000000018649c3b0 AUBase::DoInitialize() + 48
5 AudioToolbox 0x00000001864a4888 AUMethodInitialize(void*) + 76
6 twiliotest 0x00000001002251d8 create_audio_unit (coreaudio_dev.m:1507)
7 twiliotest 0x0000000100224c7c ca_factory_create_stream (coreaudio_dev.m:1599)
8 twiliotest 0x0000000100233d4c twilio_pjmedia_aud_stream_create (audiodev.c:790)
9 twiliotest 0x00000001002319d4 twilio_pjmedia_snd_port_create2 (sound_port.c:261)
10 twiliotest 0x0000000100241cec open_snd_dev (pjsua_aud.c:1715)
11 twiliotest 0x00000001002422d8 twilio_pjsua_set_snd_dev (pjsua_aud.c:1974)
12 twiliotest 0x0000000100213998 twilio_pjsua_call_make_call (pjsua_call.c:645)
13 twiliotest 0x00000001001f7090 -[TCCall makeCall] (TCCall.m:51)
14 twiliotest 0x00000001001e04a4 -[TCMakeCallCommand run] (TCCommands.m:215)
15 libdispatch.dylib 0x000000018219e1fc _dispatch_call_block_and_release + 24
16 libdispatch.dylib 0x000000018219e1bc _dispatch_client_callout + 16
17 libdispatch.dylib 0x00000001821ac3dc _dispatch_queue_serial_drain + 928
18 libdispatch.dylib 0x00000001821a19a4 _dispatch_queue_invoke + 652
19 libdispatch.dylib 0x00000001821ac8d8 _dispatch_queue_override_invoke + 360
20 libdispatch.dylib 0x00000001821ae34c _dispatch_root_queue_drain + 572
21 libdispatch.dylib 0x00000001821ae0ac _dispatch_worker_thread3 + 124
22 libsystem_pthread.dylib 0x00000001823a72a0 _pthread_wqthread + 1288
23 libsystem_pthread.dylib 0x00000001823a6d8c start_wqthread + 4
Thread 4 name: SGen worker
Thread 4:
0 libsystem_kernel.dylib 0x00000001822e2e1c __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x00000001823a89c0 _pthread_cond_wait + 640
2 twiliotest 0x00000001003fa544 thread_func (mono-os-mutex.h:108)
3 libsystem_pthread.dylib 0x00000001823a9850 _pthread_body + 240
4 libsystem_pthread.dylib 0x00000001823a9760 _pthread_body + 0
5 libsystem_pthread.dylib 0x00000001823a6d94 thread_start + 4
Thread 5 name: Finalizer
Thread 5:
0 libsystem_kernel.dylib 0x00000001822c51c4 semaphore_wait_trap + 8
1 twiliotest 0x00000001003613f8 finalizer_thread (mono-os-semaphore.h:73)
2 twiliotest 0x00000001003ce664 start_wrapper (threads.c:740)
3 twiliotest 0x000000010041efbc inner_start_thread (mono-threads-posix.c:92)
4 libsystem_pthread.dylib 0x00000001823a9850 _pthread_body + 240
5 libsystem_pthread.dylib 0x00000001823a9760 _pthread_body + 0
6 libsystem_pthread.dylib 0x00000001823a6d94 thread_start + 4
Thread 6 name: com.apple.uikit.eventfetch-thread
Thread 6:
0 libsystem_kernel.dylib 0x00000001822c5188 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001822c4ff8 mach_msg + 72
2 CoreFoundation 0x00000001832c25d0 __CFRunLoopServiceMachPort + 192
3 CoreFoundation 0x00000001832c01ec __CFRunLoopRun + 1132
4 CoreFoundation 0x00000001831ee2b8 CFRunLoopRunSpecific + 444
5 Foundation 0x0000000183d2b26c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304
6 Foundation 0x0000000183d4bdd0 -[NSRunLoop(NSRunLoop) runUntilDate:] + 96
7 UIKit 0x0000000189ba9c38 -[UIEventFetcher threadMain] + 136
8 Foundation 0x0000000183e28e68 __NSThread__start__ + 1024
9 libsystem_pthread.dylib 0x00000001823a9850 _pthread_body + 240
10 libsystem_pthread.dylib 0x00000001823a9760 _pthread_body + 0
11 libsystem_pthread.dylib 0x00000001823a6d94 thread_start + 4
Thread 7 name: Dispatch queue: com.apple.root.default-qos
Thread 7 Crashed:
0 libsystem_kernel.dylib 0x00000001822e3014 __pthread_kill + 8
1 libsystem_pthread.dylib 0x00000001823ab450 pthread_kill + 112
2 libsystem_c.dylib 0x0000000182257400 abort + 140
3 twiliotest 0x0000000100320aa0 mono_handle_native_sigsegv (mini-exceptions.c:2420)
4 libsystem_platform.dylib 0x00000001823a5348 _sigtramp + 52
5 libsystem_kernel.dylib 0x00000001822de49c abort_with_payload_wrapper_internal + 100
6 libsystem_kernel.dylib 0x00000001822de4c8 system_set_sfi_window + 0
7 TCC 0x0000000185552328 __TCCAccessRequest_block_invoke_2.80 + 0
8 TCC 0x0000000185552224 __CRASHING_DUE_TO_PRIVACY_VIOLATION__ + 0
9 TCC 0x0000000185555330 __tccd_send_block_invoke + 348
10 libxpc.dylib 0x00000001823e6fcc _xpc_connection_reply_callout + 80
11 libxpc.dylib 0x00000001823e6f3c _xpc_connection_call_reply + 40
12 libdispatch.dylib 0x000000018219e1bc _dispatch_client_callout + 16
13 libdispatch.dylib 0x00000001821aca4c _dispatch_queue_override_invoke + 732
14 libdispatch.dylib 0x00000001821ae34c _dispatch_root_queue_drain + 572
15 libdispatch.dylib 0x00000001821ae0ac _dispatch_worker_thread3 + 124
16 libsystem_pthread.dylib 0x00000001823a72a0 _pthread_wqthread + 1288
17 libsystem_pthread.dylib 0x00000001823a6d8c start_wqthread + 4
Thread 8 name: com.apple.NSURLConnectionLoader
Thread 8:
0 libsystem_kernel.dylib 0x00000001822c5188 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001822c4ff8 mach_msg + 72
2 CoreFoundation 0x00000001832c25d0 __CFRunLoopServiceMachPort + 192
3 CoreFoundation 0x00000001832c01ec __CFRunLoopRun + 1132
4 CoreFoundation 0x00000001831ee2b8 CFRunLoopRunSpecific + 444
5 CFNetwork 0x00000001839f38f0 +[NSURLConnection(Loader) _resourceLoadLoop:] + 336
6 Foundation 0x0000000183e28e68 __NSThread__start__ + 1024
7 libsystem_pthread.dylib 0x00000001823a9850 _pthread_body + 240
8 libsystem_pthread.dylib 0x00000001823a9760 _pthread_body + 0
9 libsystem_pthread.dylib 0x00000001823a6d94 thread_start + 4
Thread 9:
0 libsystem_kernel.dylib 0x00000001822e3314 __semwait_signal + 8
1 libsystem_c.dylib 0x000000018220125c nanosleep + 212
2 libsystem_c.dylib 0x000000018220117c usleep + 64
3 twiliotest 0x000000010021b694 twilio_pj_thread_sleep (os_core_unix.c:780)
4 twiliotest 0x00000001002902f8 twilio_pj_ioqueue_poll (ioqueue_select.c:862)
5 twiliotest 0x000000010028d608 worker_proc (endpoint.c:332)
6 twiliotest 0x000000010021b4b0 thread_main (os_core_unix.c:531)
7 libsystem_pthread.dylib 0x00000001823a9850 _pthread_body + 240
8 libsystem_pthread.dylib 0x00000001823a9760 _pthread_body + 0
9 libsystem_pthread.dylib 0x00000001823a6d94 thread_start + 4
Thread 10:
0 libsystem_kernel.dylib 0x00000001822e323c __select + 8
1 twiliotest 0x000000010024ead4 twilio_pj_sock_select (sock_select.c:110)
2 twiliotest 0x0000000100290044 twilio_pj_ioqueue_poll (ioqueue_select.c:882)
3 twiliotest 0x000000010027d98c twilio_pjsip_endpt_handle_events2 (sip_endpoint.c:741)
4 twiliotest 0x0000000100221f64 twilio_pjsua_handle_events (pjsua_core.c:1837)
5 twiliotest 0x0000000100221a98 worker_thread (pjsua_core.c:695)
6 twiliotest 0x000000010021b4b0 thread_main (os_core_unix.c:531)
7 libsystem_pthread.dylib 0x00000001823a9850 _pthread_body + 240
8 libsystem_pthread.dylib 0x00000001823a9760 _pthread_body + 0
9 libsystem_pthread.dylib 0x00000001823a6d94 thread_start + 4
Thread 11 name: AVAudioSession Notify Thread
Thread 11:
0 libsystem_kernel.dylib 0x00000001822c5188 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001822c4ff8 mach_msg + 72
2 CoreFoundation 0x00000001832c25d0 __CFRunLoopServiceMachPort + 192
3 CoreFoundation 0x00000001832c01ec __CFRunLoopRun + 1132
4 CoreFoundation 0x00000001831ee2b8 CFRunLoopRunSpecific + 444
5 AVFAudio 0x000000019ce83d24 GenericRunLoopThread::Entry(void*) + 164
6 AVFAudio 0x000000019cea9d9c CAPThread::Entry(CAPThread*) + 84
7 libsystem_pthread.dylib 0x00000001823a9850 _pthread_body + 240
8 libsystem_pthread.dylib 0x00000001823a9760 _pthread_body + 0
9 libsystem_pthread.dylib 0x00000001823a6d94 thread_start + 4
Thread 12:
0 libsystem_kernel.dylib 0x00000001822c51dc semaphore_timedwait_trap + 8
1 libdispatch.dylib 0x00000001821b0770 _dispatch_semaphore_wait_slow + 112
2 libdispatch.dylib 0x00000001821af808 _dispatch_worker_thread + 268
3 libsystem_pthread.dylib 0x00000001823a9850 _pthread_body + 240
4 libsystem_pthread.dylib 0x00000001823a9760 _pthread_body + 0
5 libsystem_pthread.dylib 0x00000001823a6d94 thread_start + 4
Thread 13:
0 libsystem_pthread.dylib 0x00000001823a6d88 start_wqthread + 0
Thread 7 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x0000000000000000 x2: 0x0000000000000000 x3: 0x000000015be197a0
x4: 0x000000000000001b x5: 0x000000016e359b00 x6: 0x0000000000000034 x7: 0xffffffffffffffec
x8: 0x000000000c000000 x9: 0x0000000004000000 x10: 0x0000000000003dd5 x11: 0x00000001ab196da3
x12: 0x00000001ab196da3 x13: 0x0000000000000018 x14: 0x0000000000000001 x15: 0x0000000000000881
x16: 0x0000000000000148 x17: 0x0000000000000000 x18: 0x0000000000000000 x19: 0x0000000000000006
x20: 0x000000016e35b000 x21: 0x000000010062d6b7 x22: 0x000000010062d77e x23: 0xc698a6e613ac0034
x24: 0x000000016e359ee8 x25: 0x000000010062d731 x26: 0x000000015c8c0e78 x27: 0x0000000000000004
x28: 0xffffffffffffffff fp: 0x000000016e359e80 lr: 0x00000001823ab450
sp: 0x000000016e359e60 pc: 0x00000001822e3014 cpsr: 0x00000000
Binary Images:
0x1000fc000 - 0x1006ebfff twiliotest arm64 <24d1aa9aa95d3911b2709a7a36f9a785> /var/containers/Bundle/Application/412D52E2-9ECB-4C01-B984-AB2820FBBFB0/twiliotest.app/twiliotest
0x100898000 - 0x1008c7fff dyld arm64 /usr/lib/dyld
Remainder deleted due to space considerations...
EOF
Please let me know if there is anything else I need to post. Thank you in advance for your help.
Dave

Answer 1

Be sure you are using the latest iOS voice SDK 2.0 https://www.twilio.com/docs/api/voice-sdk/ios. The Xamarin component you are using might be based on deprecated version (Twilio iOS Client SDK). The new version is Programmable Voice iOS SDK which does support iOS 10.
Details in the changelog.

Answer 2

Apps targeting iOS 10+ will crash if the required permissions string is missing.
In the case of Twilio, it needs access to the phone's microphone, so your app will need to ask the user for microphone usage permission.
You can do this by editing the Info.plist file of your app. Add this code <key>NSMicrophoneUsageDescription</key>
<string>My app needs to use the microphone.</string> within the <dict> ... </dict> section.
See iOS 10 - Changes in asking permissions of Camera, microphone and Photo Library causing application to crash and https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html for more details.