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Hi,I'm using a dispatch source as a timer, I noticed that when the object that contains it is deallocated I get a crash:libdispatch.dylib`_dispatch_xref_dispose: 0x100134ac8 <+0>: ldr w8, [x0, #48] 0x100134acc <+4>: cmp w8, #2This happens only if the dispatch source had been suspended, according to the documentation (https://developer.apple.com/library/ios/documentation/General/Conceptual/ConcurrencyProgrammingGuide/GCDWorkQueues/GCDWorkQueues.html)You can suspend and resume the delivery of dispatch source events temporarily using the dispatch_suspend and dispatch_resume methods. These methods increment and decrement the suspend count for your dispatch object. As a result, you must balance each call to dispatch_suspend with a matching call to dispatch_resume before event delivery resumesSo I'm wondering if it's not possible to dispatch_source_cancel a suspended dispatch source. Actually the crash is when dealloc ends, the dispatch_source_cancel seems to always work.Here's my code:@interface DispatchTimer(){ dispatch_source_t dispatchSource; NSString *uniqueId; } @end @implementation DispatchTimer - (void)dealloc { NSLog(@"DEALLOCATED DispatchTimer"); if(dispatch_source_testcancel(dispatchSource) == 0){ dispatch_source_cancel(dispatchSource); } } - (instancetype)init{ self = [super init]; if (self) { uniqueId = [[NSUUID UUID] UUIDString]; dispatchSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)); dispatch_time_t startTime = dispatch_time(DISPATCH_TIME_NOW, 0); uint64_t intervalTime = (int64_t)(1 * NSEC_PER_SEC); dispatch_source_set_timer(dispatchSource, startTime, intervalTime, 0); __weak DispatchTimer *weakSelf = self; dispatch_source_set_event_handler(dispatchSource, ^{ [weakSelf update]; }); dispatch_resume(dispatchSource); } return self; } - (void)stop{ dispatch_suspend(dispatchSource); } - (void)update{ NSLog(@"Update %@", uniqueId); }If method 'stop' is called when the DispatchTimer is deallocated I get the crash, if stop is not called everything seems to be fine.In the docs they mention dispatch_release but I get an error when using it in ARC.Thanks for any help.