diff --git a/submodules/MtProtoKit/PublicHeaders/MtProtoKit/MTSignal.h b/submodules/MtProtoKit/PublicHeaders/MtProtoKit/MTSignal.h
index c7e852057d..d00926cfd4 100644
--- a/submodules/MtProtoKit/PublicHeaders/MtProtoKit/MTSignal.h
+++ b/submodules/MtProtoKit/PublicHeaders/MtProtoKit/MTSignal.h
@@ -13,8 +13,13 @@
 - (instancetype)initWithGenerator:(id<MTDisposable> (^)(MTSubscriber *))generator;
 
 - (id<MTDisposable>)startWithNext:(void (^)(id next))next error:(void (^)(id error))error completed:(void (^)())completed;
+- (id<MTDisposable>)startWithNextStrict:(void (^)(id next))next error:(void (^)(id error))error completed:(void (^)())completed file:(const char *)file line:(int)line;
+
 - (id<MTDisposable>)startWithNext:(void (^)(id next))next;
+- (id<MTDisposable>)startWithNextStrict:(void (^)(id next))next file:(const char *)file line:(int)line;
+
 - (id<MTDisposable>)startWithNext:(void (^)(id next))next completed:(void (^)())completed;
+- (id<MTDisposable>)startWithNextStrict:(void (^)(id next))next completed:(void (^)())completed file:(const char *)file line:(int)line;
 
 + (MTSignal *)single:(id)next;
 + (MTSignal *)fail:(id)error;
diff --git a/submodules/MtProtoKit/Sources/MTContext.m b/submodules/MtProtoKit/Sources/MTContext.m
index 7b425dc085..dba8f3f394 100644
--- a/submodules/MtProtoKit/Sources/MTContext.m
+++ b/submodules/MtProtoKit/Sources/MTContext.m
@@ -1030,15 +1030,17 @@ static void copyKeychainDictionaryKey(NSString * _Nonnull group, NSString * _Non
                         __weak MTContext *weakSelf = self;
                         MTMetaDisposable *disposable = [[MTMetaDisposable alloc] init];
                         _fetchPublicKeysActions[@(datacenterId)] = disposable;
-                        [disposable setDisposable:[signal startWithNext:^(NSArray<NSDictionary *> *next) {
+                        [disposable setDisposable:[signal startWithNextStrict:^(NSArray<NSDictionary *> *next) {
                             [[MTContext contextQueue] dispatchOnQueue:^{
                                 __strong MTContext *strongSelf = weakSelf;
                                 if (strongSelf != nil) {
+                                    id<MTDisposable> disposable = strongSelf->_fetchPublicKeysActions[@(datacenterId)];
                                     [strongSelf->_fetchPublicKeysActions removeObjectForKey:@(datacenterId)];
+                                    [disposable dispose];
                                     [strongSelf updatePublicKeysForDatacenterWithId:datacenterId publicKeys:next];
                                 }
                             } synchronous:false];
-                        }]];
+                        } file:__FILE_NAME__ line:__LINE__]];
                         break;
                     }
                 }
@@ -1157,10 +1159,12 @@ static void copyKeychainDictionaryKey(NSString * _Nonnull group, NSString * _Non
                 {
                     [[MTContext contextQueue] dispatchOnQueue:^
                     {
+                        id<MTDisposable> disposable = strongSelf->_transportSchemeDisposableByDatacenterId[@(datacenterId)];
                         [strongSelf->_transportSchemeDisposableByDatacenterId removeObjectForKey:@(datacenterId)];
+                        [disposable dispose];
                     }];
                 }
-            }] startWithNext:^(MTTransportScheme *next)
+            }] startWithNextStrict:^(MTTransportScheme *next)
             {
                 if (MTLogEnabled()) {
                     MTLog(@"scheme: %@", next);
@@ -1176,7 +1180,7 @@ static void copyKeychainDictionaryKey(NSString * _Nonnull group, NSString * _Non
             } completed:^
             {
                 
-            }];
+            } file:__FILE_NAME__ line:__LINE__];
         }
     }];
 }
@@ -1293,7 +1297,7 @@ static void copyKeychainDictionaryKey(NSString * _Nonnull group, NSString * _Non
                 [strongSelf->_backupAddressListDisposable dispose];
                 strongSelf->_backupAddressListDisposable = nil;
             }
-        }] startWithNext:nil];
+        }] startWithNextStrict:nil file:__FILE_NAME__ line:__LINE__];
     }
 }
 
@@ -1491,7 +1495,7 @@ static void copyKeychainDictionaryKey(NSString * _Nonnull group, NSString * _Non
             _datacenterCheckKeyRemovedActionTimestamps[@(datacenterId)] = currentTimestamp;
             [_datacenterCheckKeyRemovedActions[@(datacenterId)] dispose];
             __weak MTContext *weakSelf = self;
-            _datacenterCheckKeyRemovedActions[@(datacenterId)] = [[MTDiscoverConnectionSignals checkIfAuthKeyRemovedWithContext:self datacenterId:datacenterId authKey:[[MTDatacenterAuthKey alloc] initWithAuthKey:authInfo.authKey authKeyId:authInfo.authKeyId validUntilTimestamp:authInfo.validUntilTimestamp notBound:false]] startWithNext:^(NSNumber* isRemoved) {
+            _datacenterCheckKeyRemovedActions[@(datacenterId)] = [[MTDiscoverConnectionSignals checkIfAuthKeyRemovedWithContext:self datacenterId:datacenterId authKey:[[MTDatacenterAuthKey alloc] initWithAuthKey:authInfo.authKey authKeyId:authInfo.authKeyId validUntilTimestamp:authInfo.validUntilTimestamp notBound:false]] startWithNextStrict:^(NSNumber* isRemoved) {
                 [[MTContext contextQueue] dispatchOnQueue:^{
                     __strong MTContext *strongSelf = weakSelf;
                     if (strongSelf == nil) {
@@ -1506,7 +1510,7 @@ static void copyKeychainDictionaryKey(NSString * _Nonnull group, NSString * _Non
                         }
                     }
                 }];
-            }];
+            } file:__FILE_NAME__ line:__LINE__];
         }
     }];
 }
diff --git a/submodules/MtProtoKit/Sources/MTDNS.m b/submodules/MtProtoKit/Sources/MTDNS.m
index 0b99d81516..3448e7f239 100644
--- a/submodules/MtProtoKit/Sources/MTDNS.m
+++ b/submodules/MtProtoKit/Sources/MTDNS.m
@@ -125,7 +125,7 @@
     
     if (disposable != nil) {
         __weak MTDNSContext *weakSelf = self;
-        [disposable setDisposable:[[[self performLookup:host port:port] deliverOn:[MTDNSContext sharedQueue]] startWithNext:^(NSString *result) {
+        [disposable setDisposable:[[[self performLookup:host port:port] deliverOn:[MTDNSContext sharedQueue]] startWithNextStrict:^(NSString *result) {
             __strong MTDNSContext *strongSelf = weakSelf;
             if (strongSelf == nil) {
                 return;
@@ -134,7 +134,7 @@
                 [strongSelf->_contexts[key] complete:result];
                 [strongSelf->_contexts removeObjectForKey:key];
             }
-        }]];
+        } file:__FILE_NAME__ line:__LINE__]];
     }
     
     __weak MTDNSContext *weakSelf = self;
diff --git a/submodules/MtProtoKit/Sources/MTDisposable.m b/submodules/MtProtoKit/Sources/MTDisposable.m
index cb673e0b68..949f1d4e88 100644
--- a/submodules/MtProtoKit/Sources/MTDisposable.m
+++ b/submodules/MtProtoKit/Sources/MTDisposable.m
@@ -1,13 +1,11 @@
 #import <MtProtoKit/MTDisposable.h>
 
-#import <os/lock.h>
-#import <libkern/OSAtomic.h>
-#import <stdatomic.h>
+#import <pthread/pthread.h>
 #import <objc/runtime.h>
 
-@interface MTBlockDisposable ()
-{
-    void *_block;
+@interface MTBlockDisposable () {
+    void (^_action)();
+    pthread_mutex_t _lock;
 }
 
 @end
@@ -19,47 +17,35 @@
     self = [super init];
     if (self != nil)
     {
-        _block = (__bridge_retained void *)[block copy];
+        _action = [block copy];
+        pthread_mutex_init(&_lock, nil);
     }
     return self;
 }
 
-- (void)dealloc
-{
-    void *block = _block;
-    if (block != NULL)
-    {
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wdeprecated-declarations"
-        if (OSAtomicCompareAndSwapPtr(block, 0, &_block))
-        {
-            if (block != nil)
-            {
-                __unused __strong id strongBlock = (__bridge_transfer id)block;
-                strongBlock = nil;
-            }
-        }
-#pragma clang diagnostic pop
+- (void)dealloc {
+    void (^freeAction)() = nil;
+    pthread_mutex_lock(&_lock);
+    freeAction = _action;
+    _action = nil;
+    pthread_mutex_unlock(&_lock);
+    
+    if (freeAction) {
     }
+    
+    pthread_mutex_destroy(&_lock);
 }
 
-- (void)dispose
-{
-    void *block = _block;
-    if (block != NULL)
-    {
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wdeprecated-declarations"
-        if (OSAtomicCompareAndSwapPtr(block, 0, &_block))
-        {
-            if (block != nil)
-            {
-                __strong id strongBlock = (__bridge_transfer id)block;
-                ((dispatch_block_t)strongBlock)();
-                strongBlock = nil;
-            }
-        }
-#pragma clang diagnostic pop
+- (void)dispose {
+    void (^disposeAction)() = nil;
+    
+    pthread_mutex_lock(&_lock);
+    disposeAction = _action;
+    _action = nil;
+    pthread_mutex_unlock(&_lock);
+    
+    if (disposeAction) {
+        disposeAction();
     }
 }
 
@@ -67,7 +53,7 @@
 
 @interface MTMetaDisposable ()
 {
-    os_unfair_lock _lock;
+    pthread_mutex_t _lock;
     bool _disposed;
     id<MTDisposable> _disposable;
 }
@@ -76,128 +62,139 @@
 
 @implementation MTMetaDisposable
 
-- (void)setDisposable:(id<MTDisposable>)disposable
-{
-    id<MTDisposable> previousDisposable = nil;
-    bool dispose = false;
+- (instancetype)init {
+    self = [super init];
+    if (self != nil) {
+        pthread_mutex_init(&_lock, nil);
+    }
+    return self;
+}
+
+- (void)dealloc {
+    id<MTDisposable> freeDisposable = nil;
+    pthread_mutex_lock(&_lock);
+    if (_disposable) {
+        freeDisposable = _disposable;
+        _disposable = nil;
+    }
+    pthread_mutex_unlock(&_lock);
     
-    os_unfair_lock_lock(&_lock);
-    dispose = _disposed;
-    if (!dispose)
-    {
+    if (freeDisposable) {
+    }
+    
+    pthread_mutex_destroy(&_lock);
+}
+
+- (void)setDisposable:(id<MTDisposable>)disposable {
+    id<MTDisposable> previousDisposable = nil;
+    bool disposeImmediately = false;
+    
+    pthread_mutex_lock(&_lock);
+    disposeImmediately = _disposed;
+    if (!disposeImmediately) {
         previousDisposable = _disposable;
         _disposable = disposable;
     }
-    os_unfair_lock_unlock(&_lock);
+    pthread_mutex_unlock(&_lock);
     
-    if (previousDisposable != nil)
+    if (previousDisposable) {
         [previousDisposable dispose];
+    }
     
-    if (dispose)
+    if (disposeImmediately) {
         [disposable dispose];
+    }
 }
 
-- (void)dispose
-{
+- (void)dispose {
     id<MTDisposable> disposable = nil;
     
-    os_unfair_lock_lock(&_lock);
-    if (!_disposed)
-    {
-        disposable = _disposable;
+    pthread_mutex_lock(&_lock);
+    if (!_disposed) {
         _disposed = true;
+        disposable = _disposable;
+        _disposable = nil;
     }
-    os_unfair_lock_unlock(&_lock);
+    pthread_mutex_unlock(&_lock);
     
-    if (disposable != nil)
+    if (disposable) {
         [disposable dispose];
+    }
 }
 
 @end
 
 @interface MTDisposableSet ()
 {
-    os_unfair_lock _lock;
+    pthread_mutex_t _lock;
     bool _disposed;
-    id<MTDisposable> _singleDisposable;
-    NSArray *_multipleDisposables;
+    NSMutableArray<id<MTDisposable>> *_disposables;
 }
 
 @end
 
 @implementation MTDisposableSet
 
-- (void)add:(id<MTDisposable>)disposable
-{
-    if (disposable == nil)
-        return;
-    
-    bool dispose = false;
-    
-    os_unfair_lock_lock(&_lock);
-    dispose = _disposed;
-    if (!dispose)
-    {
-        if (_multipleDisposables != nil)
-        {
-            NSMutableArray *multipleDisposables = [[NSMutableArray alloc] initWithArray:_multipleDisposables];
-            [multipleDisposables addObject:disposable];
-            _multipleDisposables = multipleDisposables;
-        }
-        else if (_singleDisposable != nil)
-        {
-            NSMutableArray *multipleDisposables = [[NSMutableArray alloc] initWithObjects:_singleDisposable, disposable, nil];
-            _multipleDisposables = multipleDisposables;
-            _singleDisposable = nil;
-        }
-        else
-        {
-            _singleDisposable = disposable;
-        }
+- (instancetype)init {
+    self = [super init];
+    if (self != nil) {
+        pthread_mutex_init(&_lock, nil);
+        _disposables = [[NSMutableArray alloc] init];
     }
-    os_unfair_lock_unlock(&_lock);
+    return self;
+}
+
+- (void)dealloc {
+    NSArray<id<MTDisposable>> *disposables = nil;
+    pthread_mutex_lock(&_lock);
+    disposables = _disposables;
+    _disposables = nil;
+    pthread_mutex_unlock(&_lock);
     
-    if (dispose)
+    if (disposables) {
+    }
+    pthread_mutex_destroy(&_lock);
+}
+
+- (void)add:(id<MTDisposable>)disposable {
+    bool disposeImmediately = false;
+    
+    pthread_mutex_lock(&_lock);
+    if (_disposed) {
+        disposeImmediately = true;
+    } else {
+        [_disposables addObject:disposable];
+    }
+    pthread_mutex_unlock(&_lock);
+    
+    if (disposeImmediately) {
         [disposable dispose];
+    }
 }
 
 - (void)remove:(id<MTDisposable>)disposable {
-    os_unfair_lock_lock(&_lock);
-    if (_multipleDisposables != nil)
-    {
-        NSMutableArray *multipleDisposables = [[NSMutableArray alloc] initWithArray:_multipleDisposables];
-        [multipleDisposables removeObject:disposable];
-        _multipleDisposables = multipleDisposables;
+    pthread_mutex_lock(&_lock);
+    for (NSInteger i = 0; i < _disposables.count; i++) {
+        if (_disposables[i] == disposable) {
+            [_disposables removeObjectAtIndex:i];
+            break;
+        }
     }
-    else if (_singleDisposable == disposable)
-    {
-        _singleDisposable = nil;
-    }
-    os_unfair_lock_unlock(&_lock);
+    pthread_mutex_unlock(&_lock);
 }
 
-- (void)dispose
-{
-    id<MTDisposable> singleDisposable = nil;
-    NSArray *multipleDisposables = nil;
-    
-    os_unfair_lock_lock(&_lock);
-    if (!_disposed)
-    {
+- (void)dispose {
+    NSArray<id<MTDisposable>> *disposables = nil;
+    pthread_mutex_lock(&_lock);
+    if (!_disposed) {
         _disposed = true;
-        singleDisposable = _singleDisposable;
-        multipleDisposables = _multipleDisposables;
-        _singleDisposable = nil;
-        _multipleDisposables = nil;
+        disposables = _disposables;
+        _disposables = nil;
     }
-    os_unfair_lock_unlock(&_lock);
+    pthread_mutex_unlock(&_lock);
     
-    if (singleDisposable != nil)
-        [singleDisposable dispose];
-    if (multipleDisposables != nil)
-    {
-        for (id<MTDisposable> disposable in multipleDisposables)
-        {
+    if (disposables) {
+        for (id<MTDisposable> disposable in disposables) {
             [disposable dispose];
         }
     }
diff --git a/submodules/MtProtoKit/Sources/MTProto.m b/submodules/MtProtoKit/Sources/MTProto.m
index 725a95e696..91a79f97c2 100644
--- a/submodules/MtProtoKit/Sources/MTProto.m
+++ b/submodules/MtProtoKit/Sources/MTProto.m
@@ -838,7 +838,7 @@ static const NSUInteger MTMaxUnacknowledgedMessageCount = 64;
                 __weak MTProto *weakSelf = self;
                 MTSignal *checkSignal = [[MTConnectionProbing probeProxyWithContext:_context datacenterId:_datacenterId settings:transport.proxySettings] delay:5.0 onQueue:[MTQueue concurrentDefaultQueue]];
                 checkSignal = [[checkSignal then:[[MTSignal complete] delay:20.0 onQueue:[MTQueue concurrentDefaultQueue]]] restart];
-                [_probingDisposable setDisposable:[checkSignal startWithNext:^(NSNumber *next) {
+                [_probingDisposable setDisposable:[checkSignal startWithNextStrict:^(NSNumber *next) {
                     [[MTProto managerQueue] dispatchOnQueue:^{
                         __strong MTProto *strongSelf = weakSelf;
                         if (strongSelf == nil) {
@@ -849,7 +849,7 @@ static const NSUInteger MTMaxUnacknowledgedMessageCount = 64;
                             [strongSelf _updateConnectionIssuesStatus:[strongSelf->_probingStatus boolValue]];
                         }
                     }];
-                }]];
+                } file:__FILE_NAME__ line:__LINE__]];
             }
         }
     }];
diff --git a/submodules/MtProtoKit/Sources/MTSignal.m b/submodules/MtProtoKit/Sources/MTSignal.m
index f1c06c919b..f1065bce71 100644
--- a/submodules/MtProtoKit/Sources/MTSignal.m
+++ b/submodules/MtProtoKit/Sources/MTSignal.m
@@ -1,6 +1,6 @@
 #import <MtProtoKit/MTSignal.h>
 
-#import <os/lock.h>
+#import <pthread/pthread.h>
 #import <MtProtoKit/MTTimer.h>
 #import <MtProtoKit/MTQueue.h>
 #import <MtProtoKit/MTAtomic.h>
@@ -8,28 +8,97 @@
 
 @interface MTSubscriberDisposable : NSObject <MTDisposable>
 {
-    MTSubscriber *_subscriber;
+    __weak MTSubscriber *_subscriber;
     id<MTDisposable> _disposable;
+    pthread_mutex_t _lock;
 }
 
 @end
 
 @implementation MTSubscriberDisposable
 
-- (instancetype)initWithSubscriber:(MTSubscriber *)subscriber disposable:(id<MTDisposable>)disposable
-{
+- (instancetype)initWithSubscriber:(MTSubscriber *)subscriber disposable:(id<MTDisposable>)disposable {
     self = [super init];
-    if (self != nil)
-    {
+    if (self != nil) {
         _subscriber = subscriber;
         _disposable = disposable;
+        pthread_mutex_init(&_lock, nil);
     }
     return self;
 }
 
-- (void)dispose
-{
-    [_subscriber _markTerminatedWithoutDisposal];
+- (void)dealloc {
+    pthread_mutex_destroy(&_lock);
+}
+
+- (void)dispose {
+    MTSubscriber *subscriber = nil;
+    id<MTDisposable> disposeItem = nil;
+    pthread_mutex_lock(&_lock);
+    disposeItem = _disposable;
+    _disposable = nil;
+    subscriber = _subscriber;
+    _subscriber = nil;
+    pthread_mutex_unlock(&_lock);
+    
+    [disposeItem dispose];
+    [subscriber _markTerminatedWithoutDisposal];
+}
+
+@end
+
+@interface MTStrictDisposable : NSObject<MTDisposable> {
+    id<MTDisposable> _disposable;
+    const char *_file;
+    int _line;
+    
+#if DEBUG
+    pthread_mutex_t _lock;
+    bool _isDisposed;
+#endif
+}
+
+- (instancetype)initWithDisposable:(id<MTDisposable>)disposable file:(const char *)file line:(int)line;
+- (void)dispose;
+
+@end
+
+@implementation MTStrictDisposable
+
+- (instancetype)initWithDisposable:(id<MTDisposable>)disposable file:(const char *)file line:(int)line {
+    self = [super init];
+    if (self != nil) {
+        _disposable = disposable;
+        _file = file;
+        _line = line;
+        
+#if DEBUG
+        pthread_mutex_init(&_lock, nil);
+#endif
+    }
+    return self;
+}
+
+- (void)dealloc {
+#if DEBUG
+    pthread_mutex_lock(&_lock);
+    if (!_isDisposed) {
+        NSLog(@"Leaked disposable from %s:%d", _file, _line);
+        assert(false);
+    }
+    pthread_mutex_unlock(&_lock);
+    
+    pthread_mutex_destroy(&_lock);
+#endif
+}
+
+- (void)dispose {
+#if DEBUG
+    pthread_mutex_lock(&_lock);
+    _isDisposed = true;
+    pthread_mutex_unlock(&_lock);
+#endif
+    
     [_disposable dispose];
 }
 
@@ -55,7 +124,7 @@
 
 @interface MTSignalQueueState : NSObject <MTDisposable>
 {
-    os_unfair_lock _lock;
+    pthread_mutex_t _lock;
     bool _executingSignal;
     bool _terminated;
     
@@ -76,6 +145,8 @@
     self = [super init];
     if (self != nil)
     {
+        pthread_mutex_init(&_lock, nil);
+        
         _subscriber = subscriber;
         _currentDisposable = [[MTMetaDisposable alloc] init];
         _queuedSignals = queueMode ? [[NSMutableArray alloc] init] : nil;
@@ -84,6 +155,10 @@
     return self;
 }
 
+- (void)dealloc {
+    pthread_mutex_destroy(&_lock);
+}
+
 - (void)beginWithDisposable:(id<MTDisposable>)disposable
 {
     _disposable = disposable;
@@ -92,7 +167,7 @@
 - (void)enqueueSignal:(MTSignal *)signal
 {
     bool startSignal = false;
-    os_unfair_lock_lock(&_lock);
+    pthread_mutex_lock(&_lock);
     if (_queueMode && _executingSignal)
     {
         [_queuedSignals addObject:signal];
@@ -102,7 +177,7 @@
         _executingSignal = true;
         startSignal = true;
     }
-    os_unfair_lock_unlock(&_lock);
+    pthread_mutex_unlock(&_lock);
     
     if (startSignal)
     {
@@ -130,7 +205,7 @@
     MTSignal *nextSignal = nil;
     
     bool terminated = false;
-    os_unfair_lock_lock(&_lock);
+    pthread_mutex_lock(&_lock);
     _executingSignal = false;
     
     if (_queueMode)
@@ -146,7 +221,7 @@
     }
     else
         terminated = _terminated;
-    os_unfair_lock_unlock(&_lock);
+    pthread_mutex_unlock(&_lock);
     
     if (terminated)
         [_subscriber putCompletion];
@@ -174,10 +249,10 @@
 - (void)beginCompletion
 {
     bool executingSignal = false;
-    os_unfair_lock_lock(&_lock);
+    pthread_mutex_lock(&_lock);
     executingSignal = _executingSignal;
     _terminated = true;
-    os_unfair_lock_unlock(&_lock);
+    pthread_mutex_unlock(&_lock);
     
     if (!executingSignal)
         [_subscriber putCompletion];
@@ -235,6 +310,14 @@
     return [[MTSubscriberDisposable alloc] initWithSubscriber:subscriber disposable:disposable];
 }
 
+- (id<MTDisposable>)startWithNextStrict:(void (^)(id next))next error:(void (^)(id error))error completed:(void (^)())completed file:(const char *)file line:(int)line
+{
+    MTSubscriber *subscriber = [[MTSubscriber alloc] initWithNext:next error:error completed:completed];
+    id<MTDisposable> disposable = _generator(subscriber);
+    [subscriber _assignDisposable:disposable];
+    return [[MTStrictDisposable alloc] initWithDisposable:[[MTSubscriberDisposable alloc] initWithSubscriber:subscriber disposable:disposable] file:file line:line];
+}
+
 - (id<MTDisposable>)startWithNext:(void (^)(id next))next
 {
     MTSubscriber *subscriber = [[MTSubscriber alloc] initWithNext:next error:nil completed:nil];
@@ -243,6 +326,14 @@
     return [[MTSubscriberDisposable alloc] initWithSubscriber:subscriber disposable:disposable];
 }
 
+- (id<MTDisposable>)startWithNextStrict:(void (^)(id next))next file:(const char *)file line:(int)line
+{
+    MTSubscriber *subscriber = [[MTSubscriber alloc] initWithNext:next error:nil completed:nil];
+    id<MTDisposable> disposable = _generator(subscriber);
+    [subscriber _assignDisposable:disposable];
+    return [[MTStrictDisposable alloc] initWithDisposable:[[MTSubscriberDisposable alloc] initWithSubscriber:subscriber disposable:disposable] file:file line:line];
+}
+
 - (id<MTDisposable>)startWithNext:(void (^)(id next))next completed:(void (^)())completed
 {
     MTSubscriber *subscriber = [[MTSubscriber alloc] initWithNext:next error:nil completed:completed];
@@ -251,6 +342,14 @@
     return [[MTSubscriberDisposable alloc] initWithSubscriber:subscriber disposable:disposable];
 }
 
+- (id<MTDisposable>)startWithNextStrict:(void (^)(id next))next completed:(void (^)())completed file:(const char *)file line:(int)line
+{
+    MTSubscriber *subscriber = [[MTSubscriber alloc] initWithNext:next error:nil completed:completed];
+    id<MTDisposable> disposable = _generator(subscriber);
+    [subscriber _assignDisposable:disposable];
+    return [[MTStrictDisposable alloc] initWithDisposable:[[MTSubscriberDisposable alloc] initWithSubscriber:subscriber disposable:disposable] file:file line:line];
+}
+
 + (MTSignal *)single:(id)next
 {
     return [[MTSignal alloc] initWithGenerator:^id<MTDisposable> (MTSubscriber *subscriber)
@@ -324,11 +423,11 @@
 {
     return [[MTSignal alloc] initWithGenerator:^id<MTDisposable> (MTSubscriber *subscriber)
     {
-        MTMetaDisposable *disposable = [[MTMetaDisposable alloc] init];
+        MTMetaDisposable *startDisposable = [[MTMetaDisposable alloc] init];
+        MTMetaDisposable *timerDisposable = [[MTMetaDisposable alloc] init];
         
-        MTTimer *timer = [[MTTimer alloc] initWithTimeout:seconds repeat:false completion:^
-        {
-            [disposable setDisposable:[self startWithNext:^(id next)
+        MTTimer *timer = [[MTTimer alloc] initWithTimeout:seconds repeat:false completion:^{
+            [startDisposable setDisposable:[self startWithNext:^(id next)
             {
                 [subscriber putNext:next];
             } error:^(id error)
@@ -342,12 +441,15 @@
         
         [timer start];
         
-        [disposable setDisposable:[[MTBlockDisposable alloc] initWithBlock:^
+        [timerDisposable setDisposable:[[MTBlockDisposable alloc] initWithBlock:^
         {
             [timer invalidate];
         }]];
         
-        return disposable;
+        return [[MTBlockDisposable alloc] initWithBlock:^{
+            [startDisposable dispose];
+            [timerDisposable dispose];
+        }];
     }];
 }
 
@@ -355,11 +457,11 @@
 {
     return [[MTSignal alloc] initWithGenerator:^id<MTDisposable> (MTSubscriber *subscriber)
     {
-        MTMetaDisposable *disposable = [[MTMetaDisposable alloc] init];
-        
-        MTTimer *timer = [[MTTimer alloc] initWithTimeout:seconds repeat:false completion:^
-        {
-            [disposable setDisposable:[signal startWithNext:^(id next)
+        MTMetaDisposable *startDisposable = [[MTMetaDisposable alloc] init];
+        MTMetaDisposable *timerDisposable = [[MTMetaDisposable alloc] init];
+
+        MTTimer *timer = [[MTTimer alloc] initWithTimeout:seconds repeat:false completion:^{
+            [startDisposable setDisposable:[signal startWithNext:^(id next)
             {
                 [subscriber putNext:next];
             } error:^(id error)
@@ -372,7 +474,7 @@
         } queue:queue.nativeQueue];
         [timer start];
         
-        [disposable setDisposable:[self startWithNext:^(id next)
+        [timerDisposable setDisposable:[self startWithNext:^(id next)
         {
             [timer invalidate];
             [subscriber putNext:next];
@@ -386,7 +488,10 @@
             [subscriber putCompletion];
         }]];
         
-        return disposable;
+        return [[MTBlockDisposable alloc] initWithBlock:^{
+            [startDisposable dispose];
+            [timerDisposable dispose];
+        }];
     }];
 }
 
diff --git a/submodules/MtProtoKit/Sources/MTSubscriber.m b/submodules/MtProtoKit/Sources/MTSubscriber.m
index da600346c9..db324ed7d0 100644
--- a/submodules/MtProtoKit/Sources/MTSubscriber.m
+++ b/submodules/MtProtoKit/Sources/MTSubscriber.m
@@ -68,6 +68,7 @@
 {
     os_unfair_lock_lock(&_lock);
     MTSubscriberBlocks *blocks = nil;
+    id<MTDisposable> disposable = _disposable;
     if (!_terminated)
     {
         blocks = _blocks;
@@ -80,6 +81,8 @@
     if (blocks) {
         blocks = nil;
     }
+    if (disposable) {
+    }
 }
 
 - (void)putNext:(id)next
@@ -100,6 +103,7 @@
 - (void)putError:(id)error
 {
     bool shouldDispose = false;
+    id<MTDisposable> disposable = nil;
     MTSubscriberBlocks *blocks = nil;
     
     os_unfair_lock_lock(&_lock);
@@ -111,19 +115,23 @@
         shouldDispose = true;
         _terminated = true;
     }
+    disposable = _disposable;
+    _disposable = nil;
     os_unfair_lock_unlock(&_lock);
     
     if (blocks && blocks->_error) {
         blocks->_error(error);
     }
     
-    if (shouldDispose)
-        [self->_disposable dispose];
+    if (shouldDispose) {
+        [disposable dispose];
+    }
 }
 
 - (void)putCompletion
 {
     bool shouldDispose = false;
+    id<MTDisposable> disposable = nil;
     MTSubscriberBlocks *blocks = nil;
     
     os_unfair_lock_lock(&_lock);
@@ -135,18 +143,30 @@
         shouldDispose = true;
         _terminated = true;
     }
+    disposable = _disposable;
+    _disposable = nil;
     os_unfair_lock_unlock(&_lock);
     
     if (blocks && blocks->_completed)
         blocks->_completed();
     
-    if (shouldDispose)
-        [self->_disposable dispose];
+    if (shouldDispose) {
+        [disposable dispose];
+    }
 }
 
 - (void)dispose
 {
-    [self->_disposable dispose];
+    id<MTDisposable> disposable = nil;
+    
+    os_unfair_lock_lock(&_lock);
+    disposable = _disposable;
+    _disposable = nil;
+    os_unfair_lock_unlock(&_lock);
+    
+    if (disposable) {
+        [disposable dispose];
+    }
 }
 
 @end
diff --git a/submodules/MtProtoKit/Sources/MTTcpConnection.m b/submodules/MtProtoKit/Sources/MTTcpConnection.m
index dd2755e68d..e8cf239881 100644
--- a/submodules/MtProtoKit/Sources/MTTcpConnection.m
+++ b/submodules/MtProtoKit/Sources/MTTcpConnection.m
@@ -947,7 +947,7 @@ struct ctr_state {
             }
             
             __weak MTTcpConnection *weakSelf = self;
-            [_resolveDisposable setDisposable:[resolveSignal startWithNext:^(MTTcpConnectionData *connectionData) {
+            [_resolveDisposable setDisposable:[resolveSignal startWithNextStrict:^(MTTcpConnectionData *connectionData) {
                 [[MTTcpConnection tcpQueue] dispatchOnQueue:^{
                     __strong MTTcpConnection *strongSelf = weakSelf;
                     if (strongSelf == nil || connectionData == nil) {
@@ -1111,7 +1111,7 @@ struct ctr_state {
                         [strongSelf->_socket readDataToLength:sizeof(struct socks5_ident_resp) withTimeout:-1 tag:MTTcpSocksLogin];
                     }
                 }];
-            }]];
+            } file:__FILE_NAME__ line:__LINE__]];
         }
     }];
 }
diff --git a/submodules/SSignalKit/SSignalKit/BUILD b/submodules/SSignalKit/SSignalKit/BUILD
index eb2b9a82f7..98f1b6f95c 100644
--- a/submodules/SSignalKit/SSignalKit/BUILD
+++ b/submodules/SSignalKit/SSignalKit/BUILD
@@ -16,7 +16,6 @@ objc_library(
       "Source",
     ],
     deps = [
-        "//submodules/SSignalKit/SwiftSignalKit"
     ],
     sdk_frameworks = [
       "Foundation",