iOS App crashes only on release mode with segmentation fault - ios

Question

I have an old iOS app that's only crashing on Release Mode. It's using some objective-c extensions and I found that under one of the extension, if I removed a line that look something like
self.containerView.addSubview(self.pageViewController.view);
then the app doesn't crash. If this line is commented out, the app doesn't show the subview as expected so it seems like when the sub view loads the app crashes. Interestingly the same line is being executed multiple times in different part of the app to load similar kind of views and none of them crashes except only one page. I tried to replace the data that the view is loading using plist to see if it's a data issue since the same extension is loading other pages fine but no luck. I have also analyzed the crash logs and use exception break point, Zombie and Memory leaks using Instrument and nothing is giving any clue. The app crashes with a breakpoint on first line of AppDelegate function indicating it's crashing outside the main code.
Below is the crash log from the device
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000000
VM Region Info: 0 is not in any region. Bytes before following region: 4302422016
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
UNUSED SPACE AT START
--->
__TEXT 10071c000-100c04000 [ 5024K] r-x/r-x SM=COW ...art.app/Smart
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [1327]
Triggered by Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libobjc.A.dylib 0x00000001990eb270 object_getMethodImplementation + 68
1 CoreFoundation 0x0000000184d8f608 _NSIsNSArray + 36
2 CoreFoundation 0x0000000184d8f608 _NSIsNSArray + 36
3 CoreFoundation 0x0000000184c779ac -[NSMutableArray addObjectsFromArray:] + 72
4 UIKitCore 0x0000000187a0fb28 -[UIView+ 16063272 (AdditionalLayoutSupport) _accumulateViewConstraintsIntoArray:] + 92
5 UIKitCore 0x0000000187a10b14 -[UIView+ 16067348 (AdditionalLayoutSupport) _switchToLayoutEngine:] + 108
6 UIKitCore 0x0000000187a10ea4 __57-[UIView+ 16068260 (AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke_2 + 184
7 CoreAutoLayout 0x000000019936f934 -[NSISEngine withBehaviors:performModifications:] + 80
8 UIKitCore 0x0000000187a10db0 __57-[UIView+ 16068016 (AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke + 536
9 UIKitCore 0x0000000187a10b64 -[UIView+ 16067428 (AdditionalLayoutSupport) _switchToLayoutEngine:] + 188
10 UIKitCore 0x0000000187a10ea4 __57-[UIView+ 16068260 (AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke_2 + 184
11 CoreAutoLayout 0x000000019936f934 -[NSISEngine withBehaviors:performModifications:] + 80
12 UIKitCore 0x0000000187a10db0 __57-[UIView+ 16068016 (AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke + 536
13 UIKitCore 0x0000000187a10b64 -[UIView+ 16067428 (AdditionalLayoutSupport) _switchToLayoutEngine:] + 188
14 UIKitCore 0x0000000187a0fd8c -[UIView+ 16063884 (AdditionalLayoutSupport) _initializeHostedLayoutEngine] + 208
15 UIKitCore 0x0000000187a04628 -[UIView+ 16016936 (UIConstraintBasedLayout) _layoutEngine_windowDidChange] + 124
16 UIKitCore 0x0000000187aed594 -[UIView+ 16971156 (Internal) _didMoveFromWindow:toWindow:] + 260
17 UIKitCore 0x0000000187aed730 -[UIView+ 16971568 (Internal) _didMoveFromWindow:toWindow:] + 672
18 UIKitCore 0x0000000187aed730 -[UIView+ 16971568 (Internal) _didMoveFromWindow:toWindow:] + 672
19 UIKitCore 0x0000000187a6dfe8 -[UIScrollView _didMoveFromWindow:toWindow:] + 92
20 UIKitCore 0x0000000187aed730 -[UIView+ 16971568 (Internal) _didMoveFromWindow:toWindow:] + 672
21 UIKitCore 0x0000000187aed730 -[UIView+ 16971568 (Internal) _didMoveFromWindow:toWindow:] + 672
22 UIKitCore 0x0000000187aed730 -[UIView+ 16971568 (Internal) _didMoveFromWindow:toWindow:] + 672
23 UIKitCore 0x0000000187aed730 -[UIView+ 16971568 (Internal) _didMoveFromWindow:toWindow:] + 672
24 UIKitCore 0x0000000187aed730 -[UIView+ 16971568 (Internal) _didMoveFromWindow:toWindow:] + 672
25 UIKitCore 0x0000000187ae1b78 __45-[UIView+ 16923512 (Hierarchy) _postMovedFromSuperview:]_block_invoke + 136
26 CoreAutoLayout 0x000000019936f934 -[NSISEngine withBehaviors:performModifications:] + 80
27 UIKitCore 0x0000000187ae1a80 -[UIView+ 16923264 (Hierarchy) _postMovedFromSuperview:] + 776
28 UIKitCore 0x0000000187af00d8 -[UIView+ 16982232 (Internal) _addSubview:positioned:relativeTo:] + 2132
29 UIKitCore 0x0000000187ab0ed0 -[UINavigationTransitionView transition:fromView:toView:] + 604
30 UIKitCore 0x0000000186e739f8 -[UINavigationController _startTransition:fromViewController:toViewController:] + 2764
31 UIKitCore 0x0000000186e73eb0 -[UINavigationController _startDeferredTransitionIfNeeded:] + 876
32 UIKitCore 0x0000000186e75230 -[UINavigationController __viewWillLayoutSubviews] + 164
33 UIKitCore 0x0000000186e580c8 -[UILayoutContainerView layoutSubviews] + 224
34 UIKitCore 0x0000000187af6448 -[UIView+ 17007688 (CALayerDelegate) layoutSublayersOfLayer:] + 2468
35 QuartzCore 0x0000000187ffbf2c -[CALayer layoutSublayers] + 288
36 QuartzCore 0x00000001880024d0 CA::Layer::layout_if_needed+ 1426640 (CA::Transaction*) + 520
37 QuartzCore 0x000000018800d820 CA::Layer::layout_and_display_if_needed+ 1472544 (CA::Transaction*) + 140
38 QuartzCore 0x0000000187f59160 CA::Context::commit_transaction+ 733536 (CA::Transaction*, double, double*) + 416
39 QuartzCore 0x0000000187f83324 CA::Transaction::commit+ 906020 () + 728
40 QuartzCore 0x0000000187f845d4 CA::Transaction::observer_callback+ 910804 (__CFRunLoopObserver*, unsigned long, void*) + 92
41 CoreFoundation 0x0000000184d0287c __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
42 CoreFoundation 0x0000000184cfcf50 __CFRunLoopDoObservers + 604
43 CoreFoundation 0x0000000184cfd498 __CFRunLoopRun + 960
44 CoreFoundation 0x0000000184cfcba0 CFRunLoopRunSpecific + 572
45 GraphicsServices 0x000000019ba3a598 GSEventRunModal + 160
46 UIKitCore 0x00000001875ec3d8 -[UIApplication _run] + 1052
47 UIKitCore 0x00000001875f1958 UIApplicationMain + 164
48 Smart 0x000000010073fb2c main + 146220 (AppDelegate.swift:85)
49 libdyld.dylib 0x00000001849db568 start + 4
Not sure where the segmentation fault is happening and where is the array. Will appreciate any suggestions or directions on this.