ios 8.1 - controller with UIWebView not shown without WiFi connection - ios

Question

Few days ago i started receiving user reports that my app is not working. After few hours of investigation i've found that controller is not shown ([self.navigationController pushViewController:terminalController animated:YES];) if it has UIWebView and there is no wifi connection! I did not believe it but i have 2 controllers - one with loading 'about the app' page and another is for showing some built-in app documentation. I'm testing on ios 8.1.2 and ipad 2.
Controller's viewDidLoad just is not invoked and the app just freezes. I've checked few times - if i turn wifi on and relaunch the app controllers are shown!
The problem is that i'm using uiwebview for showing local pages and it does not require wifi connection, so most users are very confused.
Any workaround?
Update: here is how i push controller:
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Main" bundle: nil];
ASTerminalController *terminalController = [storyboard instantiateViewControllerWithIdentifier:#"ASTerminalController"];
terminalController.htmlFilename = self.outputFilePath;
[self.navigationController pushViewController:terminalController animated:YES];
Update2: i've modified the app and now i'm creating UIWebView not in storyboard but in code. Now i can see initWithFrame hangs is there is no internet connection:
self.webView = [[UIWebView alloc] initWithFrame:self.view.bounds];
Update 1: probably some 3rd-party code uses UIWebView and somehow blocks it (see semaphore is used):
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0:
0 libsystem_kernel.dylib 0x3aa34540 semaphore_wait_trap + 8
1 libsystem_platform.dylib 0x3aabf431 _os_semaphore_wait + 9
2 libdispatch.dylib 0x01b966f7 0x1b94000 + 9975
3 UIKit 0x2ff893ef +[UIWebDocumentView initialize] + 39
4 libobjc.A.dylib 0x3a4024d5 _class_initialize + 533
5 libobjc.A.dylib 0x3a4022fd _class_initialize + 61
6 libobjc.A.dylib 0x3a40805b lookUpImpOrForward + 251
7 libobjc.A.dylib 0x3a407f53 _class_lookupMethodAndLoadCache3 + 31
8 libobjc.A.dylib 0x3a40e1d7 _objc_msgSend_uncached + 23
9 UIKit 0x2fe743d1 -[UITextInteractionAssistant(UITextInteractionAssistant_Internal) containerIsBrowserView] + 73
10 UIKit 0x2fe74353 -[UITextInteractionAssistant(UITextInteractionAssistant_Internal) textDocument] + 35
11 UIKit 0x2fe74271 -[UITextSelectionView selection] + 41
12 UIKit 0x2fe74e7f -[UITextSelectionView selectionChanged] + 167
13 UIKit 0x304f17bb __47-[UITextInputController _setSelectedTextRange:]_block_invoke251 + 223
14 UIKit 0x2fe74d8b __52-[UITextInputController _coordinateSelectionChange:]_block_invoke + 83
15 UIFoundation 0x3756bb63 -[NSTextStorage coordinateReading:] + 35
16 UIKit 0x2fe74d31 -[UITextInputController _coordinateSelectionChange:] + 97
17 UIKit 0x304f14d3 -[UITextInputController _setSelectedTextRange:] + 599
18 UIKit 0x2feda6db -[UITextView setAttributedText:] + 391
19 CppCode 0x0011b925 0xd1000 + 305445
20 CppCode 0x0011d0cb 0xd1000 + 311499
21 CppCode 0x00119daf 0xd1000 + 298415
22 CoreFoundation 0x2c931c5f __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 11
23 CoreFoundation 0x2c88d6d1 _CFXNotificationPost + 1781
24 Foundation 0x2d5bf125 -[NSNotificationCenter postNotificationName:object:userInfo:] + 69
25 Foundation 0x2d5ebe33 -[NSUserDefaults(NSUserDefaults) registerDefaults:] + 71
26 WebKitLegacy 0x389df8cd +[WebView initialize] + 301
27 libobjc.A.dylib 0x3a4024d5 _class_initialize + 533
28 libobjc.A.dylib 0x3a40805b lookUpImpOrForward + 251
29 libobjc.A.dylib 0x3a407f53 _class_lookupMethodAndLoadCache3 + 31
30 libobjc.A.dylib 0x3a40e1d7 _objc_msgSend_uncached + 23
31 WebKitLegacy 0x389df6cf WebKitInitialize + 67
32 UIKit 0x3009cf97 ___UIApplicationLoadWebKit_block_invoke + 151
33 libdispatch.dylib 0x01b959c5 0x1b94000 + 6597
34 libdispatch.dylib 0x01b9662d 0x1b94000 + 9773
35 libobjc.A.dylib 0x3a4024d5 _class_initialize + 533
36 libobjc.A.dylib 0x3a40805b lookUpImpOrForward + 251
37 libobjc.A.dylib 0x3a407f53 _class_lookupMethodAndLoadCache3 + 31
38 libobjc.A.dylib 0x3a40e1d7 _objc_msgSend_uncached + 23
39 CppCode 0x0011182d 0xd1000 + 264237
40 UIKit 0x2fe3a52b -[UIViewController loadViewIfRequired] + 599
41 UIKit 0x2fe3a299 -[UIViewController view] + 21
42 UIKit 0x2ffc3585 -[UINavigationController _startCustomTransition:] + 625
43 UIKit 0x2fee34d3 -[UINavigationController _startDeferredTransitionIfNeeded:] + 419
44 UIKit 0x2fee32d9 -[UINavigationController __viewWillLayoutSubviews] + 41
45 UIKit 0x2fee326d -[UILayoutContainerView layoutSubviews] + 181
46 UIKit 0x2fe37a6b -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 511
47 QuartzCore 0x2f85fa09 -[CALayer layoutSublayers] + 133
48 QuartzCore 0x2f85b3e1 CA::Layer::layout_if_needed(CA::Transaction*) + 357
49 QuartzCore 0x2f85b269 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 13
50 QuartzCore 0x2f85ac4d CA::Context::commit_transaction(CA::Transaction*) + 221
51 QuartzCore 0x2f85aa51 CA::Transaction::commit() + 321
52 QuartzCore 0x2f854929 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 53
53 CoreFoundation 0x2c93fd93 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 19
54 CoreFoundation 0x2c93d44f __CFRunLoopDoObservers + 275
55 CoreFoundation 0x2c93d857 __CFRunLoopRun + 911
56 CoreFoundation 0x2c88b3bd CFRunLoopRunSpecific + 473
57 CoreFoundation 0x2c88b1cf CFRunLoopRunInMode + 103
58 GraphicsServices 0x33c200a5 GSEventRunModal + 133
59 UIKit 0x2fe997ad UIApplicationMain + 1437
60 CppCode 0x0011f619 0xd1000 + 321049
61 libdyld.dylib 0x3a981aad start + 1