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Deadlock of NSLock on same(?) thread #2707

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jifang opened this issue Feb 4, 2016 · 3 comments
Closed

Deadlock of NSLock on same(?) thread #2707

jifang opened this issue Feb 4, 2016 · 3 comments
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@jifang
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jifang commented Feb 4, 2016

I hit an dead lock on [NSLock lock] yesterday, but it is hard to reproduce. From Xcode console, it indicates that the NSLock has been invoked again on the same thread.

I listed the related code snippet from my source below and the stack trace at the bottom. Is it simply a mistakenly usage of ReactiveCocoa, or is it something wrong with the synchronization internally? Let me know if you guys need more information.

I am using v4.0.0-RC.2

VBAutoGeneratedCollageViewController.m:118

        [[RACObserve(self, viewHeaderFrame) map:^id(NSValue *value) {
            if (CGRectGetMaxY([value CGRectValue]) > navHeight) {
                return @(108);
            }
            else {
                return @(navHeight);
            }
        }]
         subscribeNext:^(NSNumber *value) {
             @strongify(self)
             self.tableView.contentInset = UIEdgeInsetsMake(value.floatValue, 0, 0, 0);
         }];

VBSegmentedPager.m:49 (vc here is the instance of VBAutoGeneratedCollageViewController)

    @weakify(self)
    [RACObserve(self.headerTopMargin, constant) subscribeNext:^(NSNumber *value) {
        @strongify(self)
        for (VBBaseViewController *vc in self.pages) {
            vc.viewHeaderFrame = self.headerView.frame;
        }
    }];

VBSegmentedPager+Header.swift:38

               headerTopMargin.constant -= offset - previousOffset!
#0  0x084f943a in __psynch_mutexwait ()
#1  0x084c2c21 in _pthread_mutex_lock_wait ()
#2  0x084bd0ef in pthread_mutex_lock ()
#3  0x03518374 in -[NSLock lock] ()
#4  0x0606c47e in Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Signal.swift:60
#5  0x0605fee4 in partial apply for Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) ()
#6  0x060b2821 in SignalProducer.(startWithSignal<A, B where ...> (SignalProducer<A, B>) -> ((Signal<A, B>, Disposable) -> ()) -> ()).(closure #2) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/SignalProducer.swift:252
#7  0x060a0b83 in partial apply for SignalProducer.(startWithSignal<A, B where ...> (SignalProducer<A, B>) -> ((Signal<A, B>, Disposable) -> ()) -> ()).(closure #2) ()
#8  0x060d6a8a in specialized Observer.sendNext<A, B where ...>(A) -> () [inlined] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Observer.swift:40
#9  0x060d6a77 in RACSignal.(toSignalProducer(RACSignal) -> (String, line : Int) -> SignalProducer<AnyObject?, NSError>).(closure #1).(closure #1) [inlined] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/ObjectiveCBridging.swift:59
#10 0x060d6a77 in partial apply for RACSignal.(toSignalProducer(RACSignal) -> (String, line : Int) -> SignalProducer<AnyObject?, NSError>).(closure #1).(closure #1) ()
#11 0x060d83be in thunk ()
#12 0x06033e8b in -[RACSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriber.m:72
#13 0x060508d7 in -[RACPassthroughSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACPassthroughSubscriber.m:78
#14 0x06011bbb in __23-[RACSubject sendNext:]_block_invoke at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubject.m:93
#15 0x0601196b in -[RACSubject enumerateSubscribersUsingBlock:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubject.m:85
#16 0x06011b22 in -[RACSubject sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubject.m:92
#17 0x0604ffdb in RACForwardInvocation at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/NSObject+RACSelectorSignal.m:55
#18 0x0604fd8d in __RACSwizzleForwardInvocation_block_invoke at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/NSObject+RACSelectorSignal.m:79
#19 0x06a4c778 in ___forwarding___ ()
#20 0x06a4c57e in __forwarding_prep_0___ ()
#21 0x0444dc7c in -[UIScrollView(UIScrollViewInternal) _notifyDidScroll] ()
#22 0x166acdfb in -[UIScrollViewAccessibility _notifyDidScroll] ()
#23 0x0443299e in -[UIScrollView setContentOffset:] ()
#24 0x044cf67e in -[UITableView setContentOffset:] ()
#25 0x044556d5 in -[UIScrollView(UIScrollViewInternal) _adjustContentOffsetIfNecessary] ()
#26 0x04432cfb in -[UIScrollView _updateForChangedScrollRelatedInsets] ()
#27 0x04432b23 in -[UIScrollView setContentInset:] ()
#28 0x044cf924 in -[UITableView setContentInset:] ()
#29 0x000917f1 in __51-[VBAutoGeneratedCollageViewController viewDidLoad]_block_invoke_2 at /Users/jifang/visbit/source/pixbrite/experimental/vbit_ios_app/Pixsi/Source/Portfolio/VBAutoGeneratedCollageViewController.m:118
#30 0x06033e8b in -[RACSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriber.m:72
#31 0x060508d7 in -[RACPassthroughSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACPassthroughSubscriber.m:78
#32 0x0601803b in __29-[RACSignal(RACStream) bind:]_block_invoke_2104 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal.m:140
#33 0x06033e8b in -[RACSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriber.m:72
#34 0x06051921 in __29-[RACReturnSignal subscribe:]_block_invoke at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACReturnSignal.m:85
#35 0x060247d4 in -[RACSubscriptionScheduler schedule:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriptionScheduler.m:40
#36 0x0605183e in -[RACReturnSignal subscribe:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACReturnSignal.m:84
#37 0x0601c6fc in -[RACSignal(Subscription) subscribeNext:error:completed:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal.m:302
#38 0x06017e7c in __29-[RACSignal(RACStream) bind:]_block_invoke94 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal.m:139
#39 0x060185b0 in __29-[RACSignal(RACStream) bind:]_block_invoke131 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal.m:165
#40 0x06033e8b in -[RACSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriber.m:72
#41 0x060508d7 in -[RACPassthroughSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACPassthroughSubscriber.m:78
#42 0x0601803b in __29-[RACSignal(RACStream) bind:]_block_invoke_2104 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal.m:140
#43 0x06033e8b in -[RACSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriber.m:72
#44 0x06051921 in __29-[RACReturnSignal subscribe:]_block_invoke at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACReturnSignal.m:85
#45 0x060247d4 in -[RACSubscriptionScheduler schedule:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriptionScheduler.m:40
#46 0x0605183e in -[RACReturnSignal subscribe:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACReturnSignal.m:84
#47 0x0601c6fc in -[RACSignal(Subscription) subscribeNext:error:completed:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal.m:302
#48 0x06017e7c in __29-[RACSignal(RACStream) bind:]_block_invoke94 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal.m:139
#49 0x060185b0 in __29-[RACSignal(RACStream) bind:]_block_invoke131 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal.m:165
#50 0x06033e8b in -[RACSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriber.m:72
#51 0x060508d7 in -[RACPassthroughSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACPassthroughSubscriber.m:78
#52 0x05ff49db in __35-[RACSignal(Operations) takeUntil:]_block_invoke584 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal+Operations.m:754
#53 0x06033e8b in -[RACSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriber.m:72
#54 0x060508d7 in -[RACPassthroughSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACPassthroughSubscriber.m:78
#55 0x06048e8c in __84-[NSObject(RACPropertySubscribing) rac_valuesAndChangesForKeyPath:options:observer:]_block_invoke46 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/NSObject+RACPropertySubscribing.m:77
#56 0x06041788 in __69-[NSObject(RACKVOWrapper) rac_observeKeyPath:options:observer:block:]_block_invoke81 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/NSObject+RACKVOWrapper.m:151
#57 0x060391ce in -[RACKVOTrampoline observeValueForKeyPath:ofObject:change:context:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACKVOTrampoline.m:107
#58 0x06049c04 in -[RACKVOProxy observeValueForKeyPath:ofObject:change:context:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACKVOProxy.m:66
#59 0x03588226 in NSKVONotify ()
#60 0x0351608b in NSKeyValueNotifyObserver ()
#61 0x0351519a in NSKeyValueDidChange ()
#62 0x03603043 in -[NSObject(NSKeyValueObservingPrivate) _changeValueForKeys:count:maybeOldValuesDict:usingBlock:] ()
#63 0x03512812 in -[NSObject(NSKeyValueObservingPrivate) _changeValueForKey:key:key:usingBlock:] ()
#64 0x035bee67 in _NSSetRectValueAndNotify ()
#65 0x000f276a in __31-[VBSegmentedPager viewDidLoad]_block_invoke at /Users/jifang/visbit/source/pixbrite/experimental/vbit_ios_app/Pixsi/Source/Controllers/VBSegmentedPager.m:49
#66 0x06033e8b in -[RACSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriber.m:72
#67 0x060508d7 in -[RACPassthroughSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACPassthroughSubscriber.m:78
#68 0x0601803b in __29-[RACSignal(RACStream) bind:]_block_invoke_2104 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal.m:140
#69 0x06033e8b in -[RACSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriber.m:72
#70 0x06051921 in __29-[RACReturnSignal subscribe:]_block_invoke at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACReturnSignal.m:85
#71 0x060247d4 in -[RACSubscriptionScheduler schedule:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriptionScheduler.m:40
#72 0x0605183e in -[RACReturnSignal subscribe:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACReturnSignal.m:84
#73 0x0601c6fc in -[RACSignal(Subscription) subscribeNext:error:completed:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal.m:302
#74 0x06017e7c in __29-[RACSignal(RACStream) bind:]_block_invoke94 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal.m:139
#75 0x060185b0 in __29-[RACSignal(RACStream) bind:]_block_invoke131 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal.m:165
#76 0x06033e8b in -[RACSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriber.m:72
#77 0x060508d7 in -[RACPassthroughSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACPassthroughSubscriber.m:78
#78 0x05ff49db in __35-[RACSignal(Operations) takeUntil:]_block_invoke584 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSignal+Operations.m:754
#79 0x06033e8b in -[RACSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriber.m:72
#80 0x060508d7 in -[RACPassthroughSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACPassthroughSubscriber.m:78
#81 0x06048e8c in __84-[NSObject(RACPropertySubscribing) rac_valuesAndChangesForKeyPath:options:observer:]_block_invoke46 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/NSObject+RACPropertySubscribing.m:77
#82 0x06041788 in __69-[NSObject(RACKVOWrapper) rac_observeKeyPath:options:observer:block:]_block_invoke81 at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/NSObject+RACKVOWrapper.m:151
#83 0x060391ce in -[RACKVOTrampoline observeValueForKeyPath:ofObject:change:context:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACKVOTrampoline.m:107
#84 0x06049c04 in -[RACKVOProxy observeValueForKeyPath:ofObject:change:context:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACKVOProxy.m:66
#85 0x03588226 in NSKVONotify ()
#86 0x0351608b in NSKeyValueNotifyObserver ()
#87 0x0351519a in NSKeyValueDidChange ()
#88 0x03603043 in -[NSObject(NSKeyValueObservingPrivate) _changeValueForKeys:count:maybeOldValuesDict:usingBlock:] ()
#89 0x03512812 in -[NSObject(NSKeyValueObservingPrivate) _changeValueForKey:key:key:usingBlock:] ()
#90 0x03600dea in _NSSetFloatValueAndNotify ()
#91 0x001c0322 in VBSegmentedPager.(observeForChildViewControllerScrollingSignal(VBSegmentedPager) -> (VBBaseViewController) -> ()).(closure #4) at /Users/jifang/visbit/source/pixbrite/experimental/vbit_ios_app/Pixsi/Source/Controllers/VBSegmentedPager+Header.swift:38
#92 0x001be0e4 in partial apply for VBSegmentedPager.(observeForChildViewControllerScrollingSignal(VBSegmentedPager) -> (VBBaseViewController) -> ()).(closure #4) ()
#93 0x001c063e in thunk ()
#94 0x001be18a in partial apply for thunk ()
#95 0x060a0cc0 in thunk [inlined] ()
#96 0x060a0cb4 in partial apply for thunk ()
#97 0x060c8a33 in Observer.(init<A, B where ...> (Observer<A, B>.Type) -> (failed : (B) -> ()?, completed : () -> ()?, interrupted : () -> ()?, next : (A) -> ()?) -> Observer<A, B>).(closure #1) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Observer.swift:24
#98 0x060c80d2 in partial apply for Observer.(init<A, B where ...> (Observer<A, B>.Type) -> (failed : (B) -> ()?, completed : () -> ()?, interrupted : () -> ()?, next : (A) -> ()?) -> Observer<A, B>).(closure #1) ()
#99 0x0606c5f5 in Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Signal.swift:63
#100    0x0605fee4 in partial apply for Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) ()
#101    0x060b2821 in SignalProducer.(startWithSignal<A, B where ...> (SignalProducer<A, B>) -> ((Signal<A, B>, Disposable) -> ()) -> ()).(closure #2) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/SignalProducer.swift:252
#102    0x060a0b83 in partial apply for SignalProducer.(startWithSignal<A, B where ...> (SignalProducer<A, B>) -> ((Signal<A, B>, Disposable) -> ()) -> ()).(closure #2) ()
#103    0x0606c5f5 in Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Signal.swift:63
#104    0x0605fee4 in partial apply for Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) ()
#105    0x0606e98d in SignalType<A where ...>.(map<A><B where ...> (A) -> ((A.Value) -> B) -> Signal<B, A.Error>).(closure #1).(closure #1) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Signal.swift:228
#106    0x0606a5a9 in partial apply for SignalType<A where ...>.(map<A><B where ...> (A) -> ((A.Value) -> B) -> Signal<B, A.Error>).(closure #1).(closure #1) ()
#107    0x0606c5f5 in Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Signal.swift:63
#108    0x0605fee4 in partial apply for Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) ()
#109    0x060b2821 in SignalProducer.(startWithSignal<A, B where ...> (SignalProducer<A, B>) -> ((Signal<A, B>, Disposable) -> ()) -> ()).(closure #2) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/SignalProducer.swift:252
#110    0x060a0b83 in partial apply for SignalProducer.(startWithSignal<A, B where ...> (SignalProducer<A, B>) -> ((Signal<A, B>, Disposable) -> ()) -> ()).(closure #2) ()
#111    0x0606c5f5 in Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Signal.swift:63
#112    0x0605fee4 in partial apply for Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) ()
#113    0x060c7ed6 in Observer.sendNext<A, B where ...>(A) -> () at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Observer.swift:40
#114    0x0606f061 in SignalType<A where ...>.(filter<A where ...> (A) -> ((A.Value) -> Bool) -> Signal<A.Value, A.Error>).(closure #1).(closure #1) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Signal.swift:250
#115    0x0606a3ac in partial apply for SignalType<A where ...>.(filter<A where ...> (A) -> ((A.Value) -> Bool) -> Signal<A.Value, A.Error>).(closure #1).(closure #1) ()
#116    0x0606c5f5 in Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Signal.swift:63
#117    0x0605fee4 in partial apply for Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) ()
#118    0x060b2821 in SignalProducer.(startWithSignal<A, B where ...> (SignalProducer<A, B>) -> ((Signal<A, B>, Disposable) -> ()) -> ()).(closure #2) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/SignalProducer.swift:252
#119    0x060a0b83 in partial apply for SignalProducer.(startWithSignal<A, B where ...> (SignalProducer<A, B>) -> ((Signal<A, B>, Disposable) -> ()) -> ()).(closure #2) ()
#120    0x0606c5f5 in Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Signal.swift:63
#121    0x0605fee4 in partial apply for Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) ()
#122    0x0606e98d in SignalType<A where ...>.(map<A><B where ...> (A) -> ((A.Value) -> B) -> Signal<B, A.Error>).(closure #1).(closure #1) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Signal.swift:228
#123    0x0606a5a9 in partial apply for SignalType<A where ...>.(map<A><B where ...> (A) -> ((A.Value) -> B) -> Signal<B, A.Error>).(closure #1).(closure #1) ()
#124    0x0606c5f5 in Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Signal.swift:63
#125    0x0605fee4 in partial apply for Signal.(init<A, B where ...> (Signal<A, B>.Type) -> ((Observer<A, B>) -> Disposable?) -> Signal<A, B>).(closure #1) ()
#126    0x060b2821 in SignalProducer.(startWithSignal<A, B where ...> (SignalProducer<A, B>) -> ((Signal<A, B>, Disposable) -> ()) -> ()).(closure #2) at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/SignalProducer.swift:252
#127    0x060a0b83 in partial apply for SignalProducer.(startWithSignal<A, B where ...> (SignalProducer<A, B>) -> ((Signal<A, B>, Disposable) -> ()) -> ()).(closure #2) ()
#128    0x060d6a8a in specialized Observer.sendNext<A, B where ...>(A) -> () [inlined] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/Observer.swift:40
#129    0x060d6a77 in RACSignal.(toSignalProducer(RACSignal) -> (String, line : Int) -> SignalProducer<AnyObject?, NSError>).(closure #1).(closure #1) [inlined] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Swift/ObjectiveCBridging.swift:59
#130    0x060d6a77 in partial apply for RACSignal.(toSignalProducer(RACSignal) -> (String, line : Int) -> SignalProducer<AnyObject?, NSError>).(closure #1).(closure #1) ()
#131    0x060d83be in thunk ()
#132    0x06033e8b in -[RACSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubscriber.m:72
#133    0x060508d7 in -[RACPassthroughSubscriber sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACPassthroughSubscriber.m:78
#134    0x06011bbb in __23-[RACSubject sendNext:]_block_invoke at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubject.m:93
#135    0x0601196b in -[RACSubject enumerateSubscribersUsingBlock:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubject.m:85
#136    0x06011b22 in -[RACSubject sendNext:] at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/RACSubject.m:92
#137    0x0604ffdb in RACForwardInvocation at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/NSObject+RACSelectorSignal.m:55
#138    0x0604fd8d in __RACSwizzleForwardInvocation_block_invoke at /Users/jifang/visbit/source/carthage/Carthage/Checkouts/ReactiveCocoa/ReactiveCocoa/Objective-C/NSObject+RACSelectorSignal.m:79
#139    0x06a4c778 in ___forwarding___ ()
#140    0x06a4c57e in __forwarding_prep_0___ ()
#141    0x0444dc7c in -[UIScrollView(UIScrollViewInternal) _notifyDidScroll] ()
#142    0x166acdfb in -[UIScrollViewAccessibility _notifyDidScroll] ()
#143    0x0443299e in -[UIScrollView setContentOffset:] ()
#144    0x044cf67e in -[UITableView setContentOffset:] ()
#145    0x04447132 in -[UIScrollView _smoothScrollWithUpdateTime:] ()
#146    0x044474d3 in -[UIScrollView _smoothScrollDisplayLink:] ()
#147    0x040371d2 in CA::Display::DisplayLinkItem::dispatch() ()
#148    0x0403707b in CA::Display::DisplayLink::dispatch_items(unsigned long long, unsigned long long, unsigned long long) ()
#149    0x0403758d in CA::Display::TimerDisplayLink::callback(__CFRunLoopTimer*, void*) ()
#150    0x06a57246 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ ()
#151    0x06a56c42 in __CFRunLoopDoTimer ()
#152    0x06a154aa in __CFRunLoopRun ()
#153    0x06a14956 in CFRunLoopRunSpecific ()
#154    0x06a1476b in CFRunLoopRunInMode ()
#155    0x087e5664 in GSEventRunModal ()
#156    0x087e54a1 in GSEventRun ()
#157    0x04356299 in UIApplicationMain ()
#158    0x001a456a in main at /Users/jifang/visbit/source/pixbrite/experimental/vbit_ios_app/Pixsi/Pixsi/main.m:14
#159    0x081a5a25 in start ()
@eimantas
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eimantas commented Feb 4, 2016

Can you try to reproduce this with latest RAC release (4.0.1)? It would also be cleaner to have a backtrace with source code embedded from gist.github.com

@jifang
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jifang commented Feb 4, 2016

@eimantas OK, will try the new build

@RuiAAPeres
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@jifang any update on this?

@mdiep mdiep added the question label Apr 14, 2016
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