ASIdentifierManager.advertisingIdentifier hanging

Question

AquaWu OP

Created Jun ’21

Replies 2

Boosts 1

Views 1.2k

Participants 3

Is there any threading assumption/requirement for ASIdentifierManager.advertisingIdentifier?

Please see the complete issue and stack trace here. The main thread was waiting for the worker thread, which was blocked in ASIdentifierManager.advertisingIdentifier.

 Thread 68:
0 libsystem_kernel.dylib 0x188abf0f4 mach_msg_trap (in libsystem_kernel.dylib) + 8
1 libsystem_kernel.dylib 0x188abe5a0 mach_msg (in libsystem_kernel.dylib) + 72
2 libdispatch.dylib 0x188924880 _dispatch_mach_send_and_wait_for_reply (in libdispatch.dylib) + 500
3 libdispatch.dylib 0x188924d10 dispatch_mach_send_with_result_and_wait_for_reply$VARIANT$mp (in libdispatch.dylib) + 52
4 libxpc.dylib 0x188b8391c xpc_connection_send_message_with_reply_sync (in libxpc.dylib) + 204
5 Foundation 0x189aafa28 NSXPCCONNECTION_IS_WAITING_FOR_A_SYNCHRONOUS_REPLY (in Foundation) + 12
6 Foundation 0x189892f60 -[NSXPCConnection sendInvocation:orArguments:count:methodSignature:selector:withProxy:] (in Foundation) + 3608
7 CoreFoundation 0x188f3276c forwarding (in CoreFoundation) + 552
8 CoreFoundation 0x188f3475c forwarding_prep_0 (in CoreFoundation) + 92
9 CoreServices 0x1b1896ce4 -[LSApplicationWorkspace deviceIdentifierForAdvertising] (in CoreServices) + 160
10 AdSupport 0x198f70a60 -[ASIdentifierManager advertisingIdentifier] (in AdSupport) + 56

I don't see any thread related information in the document. I tried to recreate the scenario, but I could not reproduce the issue with the simplified test below.

 #import "ViewController.h"
 
#import "AdSupport/AdSupport.h"
#import "AppTrackingTransparency/AppTrackingTransparency.h"
 
@interface ViewController () {
 dispatch_queue_t _queue;
}
@end
 
@implementation ViewController
 
- (void)viewDidLoad {
 [super viewDidLoad];
 
 _queue = dispatch_queue_create("IdentityWorkerQueue", DISPATCH_QUEUE_SERIAL);
 dispatch_set_target_queue(_queue,
              dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0));
 
 if (@available(iOS 14, *)) {
  [ATTrackingManager requestTrackingAuthorizationWithCompletionHandler:
   ^(ATTrackingManagerAuthorizationStatus status) {
   NSLog(@"Status: %lu", (unsigned long)status);
  }];
 }
}
 
- (IBAction)action:(id)sender {
 __block NSString *adId1 = nil;
 dispatch_async(self->_queue, ^{
  sleep(1);
  adId1 = ASIdentifierManager.sharedManager.advertisingIdentifier.UUIDString;
 });
 
 __block NSString *adId2 = nil;
 dispatch_sync(self->_queue, ^{
  adId2 = adId1;
 });
}
 
@end

Is there any threading assumption/requirement for ASIdentifierManager.advertisingIdentifier? For example, would it wait for the main thread to finish a certain task when an error happens?

Boost

Answer 1

Star Lard OP

Jul ’24

I also ran into an (a crash in our case) when accessing ASIdentifierManager off the main thread; I suspect it has an undocumented main thread requirement. Reported to apple: FB14569567

0

Answer 2

VeereshUber OP

Nov ’24

Facing same problem at my end. Did any one else found the solution on this ?

0

	Thread 68:
	0 libsystem_kernel.dylib 0x188abf0f4 mach_msg_trap (in libsystem_kernel.dylib) + 8
	1 libsystem_kernel.dylib 0x188abe5a0 mach_msg (in libsystem_kernel.dylib) + 72
	2 libdispatch.dylib 0x188924880 _dispatch_mach_send_and_wait_for_reply (in libdispatch.dylib) + 500
	3 libdispatch.dylib 0x188924d10 dispatch_mach_send_with_result_and_wait_for_reply$VARIANT$mp (in libdispatch.dylib) + 52
	4 libxpc.dylib 0x188b8391c xpc_connection_send_message_with_reply_sync (in libxpc.dylib) + 204
	5 Foundation 0x189aafa28 NSXPCCONNECTION_IS_WAITING_FOR_A_SYNCHRONOUS_REPLY (in Foundation) + 12
	6 Foundation 0x189892f60 -[NSXPCConnection sendInvocation:orArguments:count:methodSignature:selector:withProxy:] (in Foundation) + 3608
	7 CoreFoundation 0x188f3276c forwarding (in CoreFoundation) + 552
	8 CoreFoundation 0x188f3475c forwarding_prep_0 (in CoreFoundation) + 92
	9 CoreServices 0x1b1896ce4 -[LSApplicationWorkspace deviceIdentifierForAdvertising] (in CoreServices) + 160
	10 AdSupport 0x198f70a60 -[ASIdentifierManager advertisingIdentifier] (in AdSupport) + 56

	#import "ViewController.h"

	#import "AdSupport/AdSupport.h"
	#import "AppTrackingTransparency/AppTrackingTransparency.h"

	@interface ViewController () {
	dispatch_queue_t _queue;
	}
	@end

	@implementation ViewController

	- (void)viewDidLoad {
	[super viewDidLoad];

	_queue = dispatch_queue_create("IdentityWorkerQueue", DISPATCH_QUEUE_SERIAL);
	dispatch_set_target_queue(_queue,
	dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0));

	if (@available(iOS 14, *)) {
	[ATTrackingManager requestTrackingAuthorizationWithCompletionHandler:
	^(ATTrackingManagerAuthorizationStatus status) {
	NSLog(@"Status: %lu", (unsigned long)status);
	}];
	}
	}

	- (IBAction)action:(id)sender {
	__block NSString *adId1 = nil;
	dispatch_async(self->_queue, ^{
	sleep(1);
	adId1 = ASIdentifierManager.sharedManager.advertisingIdentifier.UUIDString;
	});

	__block NSString *adId2 = nil;
	dispatch_sync(self->_queue, ^{
	adId2 = adId1;
	});
	}

	@end