Puzzling crash at application launch - ios

Question

Many of my users get the crash describes in the below stack trace.
As you can read it seems to happen at the application launch and it does not involved any of our methods if we did not take into account the standard main call at line 28.
I do not know how to fix this bug as I do not manage to reproduce it and the below stack trace is not helpful for me.
The bug appears only on iOS9 (93% iOS9.2, 4% iOS 9.1.0, etc..)
Maybe someone know what to do in this case?
Thread : Crashed: com.apple.main-thread
0 libobjc.A.dylib 0x180911bd0 objc_msgSend + 16
1 Foundation 0x181b7b5f4 -[NSObject(NSKeyValueObservingPrivate) _changeValueForKey:key:key:usingBlock:] + 372
2 Foundation 0x181c2430c _NSSetPointValueAndNotify + 284
3 UIKit 0x18608e798 -[UIView(Geometry) _applyISEngineLayoutValues] + 656
4 UIKit 0x185f9b458 -[UIView(Geometry) _resizeWithOldSuperviewSize:] + 136
5 CoreFoundation 0x181188370 __53-[__NSArrayM enumerateObjectsWithOptions:usingBlock:]_block_invoke + 132
6 CoreFoundation 0x181188268 -[__NSArrayM enumerateObjectsWithOptions:usingBlock:] + 308
7 UIKit 0x185f89f8c -[UIView(Geometry) resizeSubviewsWithOldSize:] + 148
8 UIKit 0x18608e8e0 -[UIView(AdditionalLayoutSupport) _is_layout] + 128
9 UIKit 0x1862931f0 -[UIView(Hierarchy) _updateConstraintsAsNecessaryAndApplyLayoutFromEngine] + 756
10 UIKit 0x185f7f778 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 656
11 QuartzCore 0x18398eb2c -[CALayer layoutSublayers] + 148
12 QuartzCore 0x183989738 CA::Layer::layout_if_needed(CA::Transaction*) + 292
13 QuartzCore 0x1839895f8 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 32
14 QuartzCore 0x183988c94 CA::Context::commit_transaction(CA::Transaction*) + 252
15 QuartzCore 0x1839889dc CA::Transaction::commit() + 512
16 QuartzCore 0x1839820cc CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 80
17 CoreFoundation 0x181248588 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
18 CoreFoundation 0x18124632c __CFRunLoopDoObservers + 372
19 CoreFoundation 0x18124675c __CFRunLoopRun + 928
20 CoreFoundation 0x181175680 CFRunLoopRunSpecific + 384
21 GraphicsServices 0x182684088 GSEventRunModal + 180
22 UIKit 0x185fecd90 UIApplicationMain + 204
23 once 0x1000f0f00 main (main.m:14)
24 libdispatch.dylib 0x180d168b8 (Missing)
As an additional information I'm using AFNetworking. Here is the AFNetworking thread stack trace that does not crash:
Thread : AFNetworking
0 libsystem_kernel.dylib 0x180e194bc mach_msg_trap + 8
1 libsystem_kernel.dylib 0x180e19338 mach_msg + 72
2 CoreFoundation 0x181248ac0 __CFRunLoopServiceMachPort + 196
3 CoreFoundation 0x1812467c4 __CFRunLoopRun + 1032
4 CoreFoundation 0x181175680 CFRunLoopRunSpecific + 384
5 Foundation 0x181b6d21c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 308
6 Foundation 0x181bc2874 -[NSRunLoop(NSRunLoop) run] + 88
7 once 0x1001ddf9c +[AFURLConnectionOperation networkRequestThreadEntryPoint:] (AFURLConnectionOperation.m:169)
8 Foundation 0x181c53c40 __NSThread__start__ + 1000
9 libsystem_pthread.dylib 0x180efbb28 _pthread_body + 156
Maybe it could help.
Thank you for your help!

Answer 1

I found another entry in SO with a stack that's eerily similar to yours. There was a resolution involving the removal of a setTranslatesAutoresizingMaskIntoConstraints:NO in a subview.
issue with reentering of view with [UIView(Geometry) _applyISEngineLayoutValues] in iOS8 but not iOS7
At application startup, this could only be your main view controller or the launchScreen if you have a xib/storyboard for it.