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# Cause: Crash due to signal: SIGSEGV(SEGV_MAPERR) at 0000000c
# Reported at: 2021-07-23 04:22:58 UTC
Thread 0 [Crashed]:
0 libobjc.A.dylib 0x1a8ccae2c AutoreleasePoolPage::AutoreleasePoolPage(AutoreleasePoolPage*) + 84
1 libobjc.A.dylib 0x1a8ccac2c AutoreleasePoolPage::autoreleaseFullPage(objc_object*, AutoreleasePoolPage*) + 59
2 libobjc.A.dylib 0x1a8ccaabc objc_object::rootAutorelease2() + 107
3 CoreAutoLayout 0x1a8f24e78 _engineVar_forVariable + 203
4 CoreAutoLayout 0x1a8f3813c -[NSISLinearExpression addVariable:coefficient:] + 59
5 UIKitCore 0x197f8c258 -[UIView(AdditionalLayoutSupport) nsli_lowerAttribute:intoExpression:withCoefficient:forConstraint:onBehalfOfLayoutGuide:] + 2999
6 UIKitCore 0x197f8b688 -[UIView(AdditionalLayoutSupport) nsli_lowerAttribute:intoExpression:withCoefficient:forConstraint:] + 307
7 CoreAutoLayout 0x1a8f42928 -[NSLayoutConstraint _lowerIntoExpression:reportingConstantIsRounded:] + 75
8 CoreAutoLayout 0x1a8f3ec90 -[NSLayoutConstraint _tryToChangeContainerGeometryWithUndoHandler:] + 171
9 CoreAutoLayout 0x1a8f3f4b0 -[NSLayoutConstraint _setSymbolicConstant:constant:symbolicConstantMultiplier:] + 403
10 CoreAutoLayout 0x1a8f3f8d0 -[NSLayoutConstraint setConstant:] + 91
11 UIKitCore 0x197f7e538 -[UIView(UIConstraintBasedLayout) _updateContentSizeConstraints] + 687
12 UIKitCore 0x197f87e94 -[UIView(AdditionalLayoutSupport) _updateSystemConstraints] + 123
13 UIKitCore 0x197f86c60 -[UIView(AdditionalLayoutSupport) _sendUpdateConstraintsIfNecessaryForSecondPass:] + 479
14 UIKitCore 0x197f87114 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededCollectingViews:forSecondPass:] + 943
15 UIKitCore 0x197f86ff4 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededCollectingViews:forSecondPass:] + 655
16 CoreAutoLayout 0x1a8f2a934 -[NSISEngine withBehaviors:performModifications:] + 79
17 UIKitCore 0x197f877cc _100-[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededWithViewForVariableChangeNotifications:]_block_invoke + 87
18 UIKitCore 0x197f861f0 -[UIView(AdditionalLayoutSupport) _withUnsatisfiableConstraintsLoggingSuspendedIfEngineDelegateExists:] + 119
19 UIKitCore 0x197f87418 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededWithViewForVariableChangeNotifications:] + 159
20 UIKitCore 0x197f883f0 -[UIView(AdditionalLayoutSupport) _updateConstraintsAtEngineLevelIfNeededWithViewForVariableChangeNotifications:] + 427
21 UIKitCore 0x198058524 -[UIView _updateConstraintsAsNecessaryAndApplyLayoutFromEngine] + 367
22 UIKitCore 0x19806b288 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 2467
23 QuartzCore 0x19856eb2c -[CALayer layoutSublayers] + 287
24 QuartzCore 0x198574ff8 CA::Layer::layout_if_needed(CA::Transaction*) + 519
25 QuartzCore 0x198580314 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 139
26 QuartzCore 0x1984cc570 CA::Context::commit_transaction(CA::Transaction*, double, double*) + 415
27 QuartzCore 0x1984f66f8 CA::Transaction::commit() + 727
28 QuartzCore 0x1984f79a8 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 91
29 CoreFoundation 0x19527c86c _CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 31
30 CoreFoundation 0x195276f40 _CFRunLoopDoObservers + 603
31 CoreFoundation 0x195277488 _CFRunLoopRun + 959
32 CoreFoundation 0x195276b90 CFRunLoopRunSpecific + 571
33 GraphicsServices 0x1ab599598 GSEventRunModal + 159
34 UIKitCore 0x197b60638 -[UIApplication _run] + 1051
35 UIKitCore 0x197b65bb8 UIApplicationMain + 163
36 Gojek 0x10228a840 main (VTGojekCreator.swift:52)
37 libdyld.dylib 0x194f55588 $start + 3
Thread 1:
0 libsystem_kernel.dylib 0x1c032a48c _workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1db961874 $start_wqthread + 7
I added few logs in Crash reporting tools and looks like it is crashing while pushing the new controller but I can see looking at the logs that loadView of next view controller is not even getting called. I have had no luck reproducing it in local machine after thousand of tries across different simulator and devices. This crash is happening across the devices and iOS versions.
Please help me out, I am feeling lost now.
Problems like this, where you hit a memory access exception when draining the autorelease pool, are almost always a memory management issue, and most commonly an over-release issue. That is, something in your process is releasing an object more times than it should, leaving a dangling reference in the autorelease pool. When the system goes to drain that pool, it releases that dangling reference and then crashes.
The first step in debugging such problems is to run the app under the standard memory debugging tools, and specifically Zombies. These tools ofter turn unreproducible problems into reproducible ones, and you can debug from there.
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"
Thank you @eskimo.
I have already tried address sanitiser and zombies, it doesn't point out to anything.
Since I am using ARC and latest swift language, why would over release can happen? This crash is locally not reproducible.
Is there any way we can know which object is over releasing?
One interesting fact about this is that out of ~600 users, this crash is happening for ~25 users consistently, those 25 users can't use the app at all.
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