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[Bug] iOS Crash, Shell.GetNavBarIsVisible: 'SIGABRT' for 'Object reference not set to an instance of an object' #14125

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inimirpaz opened this issue Apr 8, 2021 · 10 comments · Fixed by #14689
Closed

[Bug] iOS Crash, Shell.GetNavBarIsVisible: 'SIGABRT' for 'Object reference not set to an instance of an object' #14125

inimirpaz opened this issue Apr 8, 2021 · 10 comments · Fixed by #14689
Labels
a/navbar a/shell 🐚 i/high Completely doesn't work, crashes, or is unusably slow, has no obvious workaround; occurs less often p/iOS 🍎 s/needs-repro ❔ This reported issue doesn't include a sample project reproducing the issue. Please provide one. s/unverified New report that has yet to be verified t/bug 🐛

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@inimirpaz
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inimirpaz commented Apr 8, 2021 •
edited
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Description

I have been experiencing a lot of crash issues on iOS due to a Xamarin.Forms.Shell.GetNavBarIsVisible call.

E.g.

Hardware Model:      iPhone9,3
Code Type:       arm64
Parent Process:   [1]

Date/Time:       2021-02-28T09:42:13.999Z
Launch Time:     2021-02-28T09:03:09Z
OS Version:      iPhone OS 14.4 (18D52)
Report Version:  104

Exception Type:  SIGABRT
Exception Codes: #0 at 0x1bb14c84c
Crashed Thread:  0

Application Specific Information:
*** Terminating app due to uncaught exception 'SIGABRT', reason: 'Object reference not set to an instance of an object'

Xamarin Exception Stack:
System.NullReferenceException: Object reference not set to an instance of an object
  at Xamarin.Forms.Shell.GetNavBarIsVisible (Xamarin.Forms.BindableObject obj) <0x10555ece0 + 0x00024> in <978ec34c5c9c4c4eb3d73b6da958bcd6#b512393cfcba0fe683ad3901c90fd1a0>:0
  at Xamarin.Forms.Platform.iOS.ShellSectionRenderer+NavDelegate.WillShowViewController (UIKit.UINavigationController navigationController, UIKit.UIViewController viewController, System.Boolean animated) <0x1062e6080 + 0x000c7> in <c931dad88b3a4eb1a8b9d018a5818b8c#b512393cfcba0fe683ad3901c90fd1a0>:0
  at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) <0x1060165e0 + 0x0002f> in <605c9d1d803040f889fdbf69630efe9f#b512393cfcba0fe683ad3901c90fd1a0>:0
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) <0x106016550 + 0x00043> in <605c9d1d803040f889fdbf69630efe9f#b512393cfcba0fe683ad3901c90fd1a0>:0
  at TestApp.iOS.Application.Main (System.String[] args) <0x105022b50 + 0x00023> in <562923ba70544658b1da7997e42bb2a6#b512393cfcba0fe683ad3901c90fd1a0>:0

Thread 0 Crashed:
0   libsystem_kernel.dylib               0x00000001bb14c84c __pthread_kill + 8
1   libsystem_c.dylib                    0x0000000197f088f4 abort + 96
2   TestApp.iOS                      0x00000001071ba9b0 0x104fa8000 + 35727792
3   TestApp.iOS                      0x000000010707f900 0x104fa8000 + 34437376
4   TestApp.iOS                      0x00000001070146cc 0x104fa8000 + 33998540
5   TestApp.iOS                      0x00000001070130b4 0x104fa8000 + 33992884
6   TestApp.iOS                      0x00000001070093b8 0x104fa8000 + 33952696
7   TestApp.iOS                      0x00000001062e6148 0x104fa8000 + 20177224
8   TestApp.iOS                      0x00000001062e6148 0x104fa8000 + 20177224
9   TestApp.iOS                      0x00000001053bfca0 0x104fa8000 + 4291744
10  TestApp.iOS                      0x00000001070262f0 0x104fa8000 + 34071280
11  TestApp.iOS                      0x00000001070e1a14 0x104fa8000 + 34839060
12  TestApp.iOS                      0x00000001070e5278 0x104fa8000 + 34853496
13  TestApp.iOS                      0x000000010500024c 0x104fa8000 + 361036
14  TestApp.iOS                      0x000000010500a9c0 0x104fa8000 + 403904
15  UIKitCore                            0x00000001912ff270 -[UINavigationController _startTransition:fromViewController:toViewController:] + 1424
16  UIKitCore                            0x00000001912ffc60 -[UINavigationController _startDeferredTransitionIfNeeded:] + 872
17  UIKitCore                            0x0000000191300fe0 -[UINavigationController __viewWillLayoutSubviews] + 160
18  UIKitCore                            0x00000001912e3e78 -[UILayoutContainerView layoutSubviews] + 220
19  UIKitCore                            0x0000000191f82398 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 2464
20  QuartzCore                           0x0000000192487df4 -[CALayer layoutSublayers] + 284
21  QuartzCore                           0x000000019248e398 CA::Layer::layout_if_needed(CA::Transaction*) + 516
22  QuartzCore                           0x00000001924996e8 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 136
23  QuartzCore                           0x00000001923e4d7c CA::Context::commit_transaction(CA::Transaction*, double, double*) + 412
24  QuartzCore                           0x000000019240ef40 CA::Transaction::commit() + 724
25  QuartzCore                           0x00000001924101f0 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 88
26  CoreFoundation                       0x000000018f18c87c __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 28
27  CoreFoundation                       0x000000018f186f50 __CFRunLoopDoObservers + 600
28  CoreFoundation                       0x000000018f187498 __CFRunLoopRun + 956
29  CoreFoundation                       0x000000018f186ba0 CFRunLoopRunSpecific + 568
30  GraphicsServices                     0x00000001a5eef598 GSEventRunModal + 156
31  UIKitCore                            0x0000000191a782f4 -[UIApplication _run] + 1048
32  UIKitCore                            0x0000000191a7d874 UIApplicationMain + 160
33  TestApp.iOS                      0x00000001060d20f8 0x104fa8000 + 17998072
34  TestApp.iOS                      0x0000000106016610 0x104fa8000 + 17229328
35  TestApp.iOS                      0x0000000106016594 0x104fa8000 + 17229204
36  TestApp.iOS                      0x0000000105022b74 0x104fa8000 + 502644
37  TestApp.iOS                      0x00000001053bfca0 0x104fa8000 + 4291744
38  TestApp.iOS                      0x00000001070262f0 0x104fa8000 + 34071280
39  TestApp.iOS                      0x00000001070e1a14 0x104fa8000 + 34839060
40  TestApp.iOS                      0x00000001070e7c6c 0x104fa8000 + 34864236
41  TestApp.iOS                      0x0000000107004884 0x104fa8000 + 33933444
42  TestApp.iOS                      0x00000001071c2424 0x104fa8000 + 35759140
43  TestApp.iOS                      0x0000000105022acc 0x104fa8000 + 502476
44  libdyld.dylib                        0x000000018ee65568 start + 0

Steps to Reproduce

N/A

Basic Information

  • Version with issue: 5.0
@inimirpaz inimirpaz added s/unverified New report that has yet to be verified t/bug 🐛 labels Apr 8, 2021
@rachelkang
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Hi, @inimirpaz - thanks for submitting this issue. Would you be able to share your project or a sample project reproducing the issue so that we can take a closer look? Thanks :)

@rachelkang rachelkang added a/navbar a/shell 🐚 i/high Completely doesn't work, crashes, or is unusably slow, has no obvious workaround; occurs less often p/iOS 🍎 s/needs-info ❓ A question has been asked that requires an answer before work can continue on this issue. s/needs-repro ❔ This reported issue doesn't include a sample project reproducing the issue. Please provide one. labels Apr 29, 2021
@inimirpaz
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inimirpaz commented Apr 30, 2021 •
edited
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Hi, @rachelkang , I am not able to share a project. Is there anything we can add to make it more debugable? What should we be keeping an eye on? (e.g. Navigation.Push/Pop, ... ?)

We have a lot of this issue reports but they have basically the same details... Here's another one

Hardware Model: iPhone11,8 Code Type: arm64 Parent Process: [1]

Date/Time: 2021-04-17T17:19:06.999Z
Launch Time: 2021-04-17T17:16:24Z
OS Version: iPhone OS 14.4.2 (18D70)
Report Version: 104

Exception Type: SIGABRT
Exception Codes: #0 at 0x1b2275414
Crashed Thread: 0

Application Specific Information:
*** Terminating app due to uncaught exception 'SIGABRT', reason: 'Object reference not set to an instance of an object'

Xamarin Exception Stack:
System.NullReferenceException: Object reference not set to an instance of an object
at Xamarin.Forms.Shell.GetNavBarIsVisible (Xamarin.Forms.BindableObject obj) <0x10284ace0 + 0x00024> in <978ec34c5c9c4c4eb3d73b6da958bcd6#e7885529838117dbc94526679c26b166>:0
at Xamarin.Forms.Platform.iOS.ShellSectionRenderer+NavDelegate.WillShowViewController (UIKit.UINavigationController navigationController, UIKit.UIViewController viewController, System.Boolean animated) <0x1035c7810 + 0x000c7> in <c931dad88b3a4eb1a8b9d018a5818b8c#e7885529838117dbc94526679c26b166>:0
at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) <0x103300240 + 0x0002f> in <ad1be307855442e4b2cb88e33f94f908#e7885529838117dbc94526679c26b166>:0
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) <0x1033001b0 + 0x00043> in <ad1be307855442e4b2cb88e33f94f908#e7885529838117dbc94526679c26b166>:0
at TestApp.iOS.Application.Main (System.String[] args) <0x10230eb60 + 0x00023> in <1211f366acca4166ad746ca13074fb3a#e7885529838117dbc94526679c26b166>:0

Thread 0 Crashed:
0 libsystem_kernel.dylib 0x00000001b2275414 0x1b224d000 + 164884
1 libsystem_c.dylib 0x000000018d753b74 0x18d6dd000 + 486260
2 TestApp.iOS 0x000000010449d97c 0x102294000 + 35690876
3 TestApp.iOS 0x00000001043628d0 0x102294000 + 34400464
4 TestApp.iOS 0x00000001042f769c 0x102294000 + 33961628
5 TestApp.iOS 0x00000001042f6084 0x102294000 + 33955972
6 TestApp.iOS 0x00000001042ec388 0x102294000 + 33915784
7 TestApp.iOS 0x00000001035c78d8 0x102294000 + 20134104
8 TestApp.iOS 0x00000001035c78d8 0x102294000 + 20134104
9 TestApp.iOS 0x00000001026abca0 0x102294000 + 4291744
10 TestApp.iOS 0x00000001043092c0 0x102294000 + 34034368
11 TestApp.iOS 0x00000001043c49e4 0x102294000 + 34802148
12 TestApp.iOS 0x00000001043c8248 0x102294000 + 34816584
13 TestApp.iOS 0x00000001022ec24c 0x102294000 + 361036
14 TestApp.iOS 0x00000001022f69c0 0x102294000 + 403904
15 UIKitCore 0x00000001864f61b8 0x186112000 + 4080056
16 UIKitCore 0x00000001864f6bac 0x186112000 + 4082604
17 UIKitCore 0x00000001864f7f88 0x186112000 + 4087688
18 UIKitCore 0x00000001864d9a18 0x186112000 + 3963416
19 UIKitCore 0x0000000187227ec4 0x186112000 + 17915588
20 QuartzCore 0x0000000187742644 0x1875e3000 + 1439300
21 QuartzCore 0x0000000187742b18 0x1875e3000 + 1440536
22 QuartzCore 0x000000018775730c 0x1875e3000 + 1524492
23 QuartzCore 0x000000018769c640 0x1875e3000 + 759360
24 QuartzCore 0x00000001876c7b08 0x1875e3000 + 936712
25 QuartzCore 0x00000001876c8e98 0x1875e3000 + 941720
26 CoreFoundation 0x00000001842a0358 0x184200000 + 656216
27 CoreFoundation 0x000000018429a5c4 0x184200000 + 632260
28 CoreFoundation 0x000000018429ab74 0x184200000 + 633716
29 CoreFoundation 0x000000018429a21c 0x184200000 + 631324
30 GraphicsServices 0x000000019be64784 0x19be61000 + 14212
31 UIKitCore 0x0000000186cdaee8 0x186112000 + 12357352
32 UIKitCore 0x0000000186ce075c 0x186112000 + 12379996
33 TestApp.iOS 0x00000001033b3868 0x102294000 + 17954920
34 TestApp.iOS 0x0000000103300270 0x102294000 + 17220208
35 TestApp.iOS 0x00000001033001f4 0x102294000 + 17220084
36 TestApp.iOS 0x000000010230eb84 0x102294000 + 502660
37 TestApp.iOS 0x00000001026abca0 0x102294000 + 4291744
38 TestApp.iOS 0x00000001043092c0 0x102294000 + 34034368
39 TestApp.iOS 0x00000001043c49e4 0x102294000 + 34802148
40 TestApp.iOS 0x00000001043cac3c 0x102294000 + 34827324
41 TestApp.iOS 0x00000001042e7854 0x102294000 + 33896532
42 TestApp.iOS 0x00000001044a540c 0x102294000 + 35722252
43 TestApp.iOS 0x000000010230eae0 0x102294000 + 502496
44 libdyld.dylib 0x0000000183f5a6b0 0x183f59000 + 5808

Thread 1:
0 libsystem_kernel.dylib 0x00000001b22751ac 0x1b224d000 + 164268
1 TestApp.iOS 0x0000000104468354 0x102294000 + 35472212
2 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
3 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 2:
0 libsystem_kernel.dylib 0x00000001b225130c 0x1b224d000 + 17164
1 TestApp.iOS 0x00000001044129d0 0x102294000 + 35121616
2 TestApp.iOS 0x0000000104412854 0x102294000 + 35121236
3 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
4 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 3:
0 libsystem_kernel.dylib 0x00000001b22512d0 0x1b224d000 + 17104
1 CoreFoundation 0x00000001842a0c30 0x184200000 + 658480
2 CoreFoundation 0x000000018429ac14 0x184200000 + 633876
3 CoreFoundation 0x000000018429a21c 0x184200000 + 631324
4 Foundation 0x0000000185549df0 0x185541000 + 36336
5 Foundation 0x0000000185549cbc 0x185541000 + 36028
6 UIKitCore 0x0000000186d8ec48 0x186112000 + 13093960
7 Foundation 0x00000001856bba34 0x185541000 + 1550900
8 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
9 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 4:
0 libsystem_kernel.dylib 0x00000001b2251324 0x1b224d000 + 17188
1 TestApp.iOS 0x00000001044129d0 0x102294000 + 35121616
2 TestApp.iOS 0x0000000104412854 0x102294000 + 35121236
3 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
4 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 5:
0 libsystem_kernel.dylib 0x00000001b2251324 0x1b224d000 + 17188
1 TestApp.iOS 0x00000001044129d0 0x102294000 + 35121616
2 TestApp.iOS 0x0000000104412854 0x102294000 + 35121236
3 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
4 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 6:
0 libsystem_kernel.dylib 0x00000001b22751ac 0x1b224d000 + 164268
1 TestApp.iOS 0x0000000104477ae4 0x102294000 + 35535588
2 TestApp.iOS 0x000000010441e048 0x102294000 + 35168328
3 TestApp.iOS 0x000000010441df20 0x102294000 + 35168032
4 TestApp.iOS 0x000000010441e144 0x102294000 + 35168580
5 TestApp.iOS 0x000000010440cf1c 0x102294000 + 35098396
6 TestApp.iOS 0x00000001043872b8 0x102294000 + 34550456
7 TestApp.iOS 0x0000000102418fa8 0x102294000 + 1593256
8 TestApp.iOS 0x0000000102418b14 0x102294000 + 1592084
9 TestApp.iOS 0x000000010241861c 0x102294000 + 1590812
10 TestApp.iOS 0x00000001024185cc 0x102294000 + 1590732
11 TestApp.iOS 0x00000001024184cc 0x102294000 + 1590476
12 TestApp.iOS 0x0000000102418578 0x102294000 + 1590648
13 TestApp.iOS 0x000000010241b934 0x102294000 + 1603892
14 TestApp.iOS 0x000000010241207c 0x102294000 + 1564796
15 TestApp.iOS 0x000000010240fbac 0x102294000 + 1555372
16 TestApp.iOS 0x000000010240f9ac 0x102294000 + 1554860
17 TestApp.iOS 0x000000010240f930 0x102294000 + 1554736
18 TestApp.iOS 0x00000001024121e4 0x102294000 + 1565156
19 TestApp.iOS 0x00000001026abca0 0x102294000 + 4291744
20 TestApp.iOS 0x00000001043092c0 0x102294000 + 34034368
21 TestApp.iOS 0x00000001043c49e4 0x102294000 + 34802148
22 TestApp.iOS 0x00000001043ca2d0 0x102294000 + 34824912
23 TestApp.iOS 0x0000000104412ac8 0x102294000 + 35121864
24 TestApp.iOS 0x0000000104412854 0x102294000 + 35121236
25 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
26 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 7:
0 libsystem_kernel.dylib 0x00000001b227570c 0x1b224d000 + 165644
1 TestApp.iOS 0x0000000104403f5c 0x102294000 + 35061596
2 TestApp.iOS 0x0000000104403924 0x102294000 + 35060004
3 TestApp.iOS 0x00000001044129d0 0x102294000 + 35121616
4 TestApp.iOS 0x0000000104412854 0x102294000 + 35121236
5 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
6 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 8:
0 libsystem_kernel.dylib 0x00000001b2251324 0x1b224d000 + 17188
1 TestApp.iOS 0x00000001044129d0 0x102294000 + 35121616
2 TestApp.iOS 0x0000000104412854 0x102294000 + 35121236
3 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
4 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 9:
0 libsystem_kernel.dylib 0x00000001b22751ac 0x1b224d000 + 164268
1 TestApp.iOS 0x0000000104477b0c 0x102294000 + 35535628
2 TestApp.iOS 0x000000010441e048 0x102294000 + 35168328
3 TestApp.iOS 0x000000010441df20 0x102294000 + 35168032
4 TestApp.iOS 0x00000001043b6d38 0x102294000 + 34745656
5 TestApp.iOS 0x000000010438589c 0x102294000 + 34543772
6 TestApp.iOS 0x0000000102411768 0x102294000 + 1562472
7 TestApp.iOS 0x0000000102411820 0x102294000 + 1562656
8 TestApp.iOS 0x000000010241130c 0x102294000 + 1561356
9 TestApp.iOS 0x0000000102411360 0x102294000 + 1561440
10 TestApp.iOS 0x000000010240c288 0x102294000 + 1540744
11 TestApp.iOS 0x000000010240bfec 0x102294000 + 1540076
12 TestApp.iOS 0x0000000102cd69f0 0x102294000 + 10758640
13 TestApp.iOS 0x0000000102cd67e8 0x102294000 + 10758120
14 TestApp.iOS 0x0000000102cd671c 0x102294000 + 10757916
15 TestApp.iOS 0x000000010356f4c4 0x102294000 + 19772612
16 TestApp.iOS 0x000000010241207c 0x102294000 + 1564796
17 TestApp.iOS 0x000000010240fbac 0x102294000 + 1555372
18 TestApp.iOS 0x000000010240f9ac 0x102294000 + 1554860
19 TestApp.iOS 0x000000010240f930 0x102294000 + 1554736
20 TestApp.iOS 0x00000001024121e4 0x102294000 + 1565156
21 TestApp.iOS 0x00000001026abca0 0x102294000 + 4291744
22 TestApp.iOS 0x00000001043092c0 0x102294000 + 34034368
23 TestApp.iOS 0x00000001043c49e4 0x102294000 + 34802148
24 TestApp.iOS 0x00000001043ca2d0 0x102294000 + 34824912
25 TestApp.iOS 0x0000000104412ac8 0x102294000 + 35121864
26 TestApp.iOS 0x0000000104412854 0x102294000 + 35121236
27 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
28 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 10:
0 libsystem_kernel.dylib 0x00000001b22512d0 0x1b224d000 + 17104
1 CoreFoundation 0x00000001842a0c30 0x184200000 + 658480
2 CoreFoundation 0x000000018429ac14 0x184200000 + 633876
3 CoreFoundation 0x000000018429a21c 0x184200000 + 631324
4 CFNetwork 0x0000000184b701c0 0x184924000 + 2408896
5 Foundation 0x00000001856bba34 0x185541000 + 1550900
6 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
7 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 11:
0 libsystem_kernel.dylib 0x00000001b22512d0 0x1b224d000 + 17104
1 CoreFoundation 0x00000001842a0c30 0x184200000 + 658480
2 CoreFoundation 0x000000018429ac14 0x184200000 + 633876
3 CoreFoundation 0x000000018429a21c 0x184200000 + 631324
4 AudioSession 0x000000018bde30c4 0x18bdd6000 + 53444
5 AudioSession 0x000000018bde525c 0x18bdd6000 + 62044
6 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
7 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 12:
0 libsystem_kernel.dylib 0x00000001b2251324 0x1b224d000 + 17188
1 TestApp.iOS 0x00000001044129d0 0x102294000 + 35121616
2 TestApp.iOS 0x0000000104412854 0x102294000 + 35121236
3 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
4 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 13:
0 libsystem_kernel.dylib 0x00000001b2251324 0x1b224d000 + 17188
1 TestApp.iOS 0x00000001044129d0 0x102294000 + 35121616
2 TestApp.iOS 0x0000000104412854 0x102294000 + 35121236
3 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
4 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 14:
0 libsystem_kernel.dylib 0x00000001b2276184 0x1b224d000 + 168324
1 libsystem_pthread.dylib 0x00000001cfdd876c 0x1cfdce000 + 42860

Thread 15:
0 libsystem_kernel.dylib 0x00000001b2251324 0x1b224d000 + 17188
1 TestApp.iOS 0x00000001044129d0 0x102294000 + 35121616
2 TestApp.iOS 0x0000000104412854 0x102294000 + 35121236
3 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
4 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 16:
0 ??? 0x0000000000000000 0x0 + 0

Thread 17:
0 libsystem_kernel.dylib 0x00000001b22751ac 0x1b224d000 + 164268
1 TestApp.iOS 0x0000000104477ae4 0x102294000 + 35535588
2 TestApp.iOS 0x00000001044807c4 0x102294000 + 35571652
3 TestApp.iOS 0x0000000104406bb0 0x102294000 + 35072944
4 TestApp.iOS 0x00000001044129d0 0x102294000 + 35121616
5 TestApp.iOS 0x0000000104412854 0x102294000 + 35121236
6 libsystem_pthread.dylib 0x00000001cfdcfcb0 0x1cfdce000 + 7344
7 libsystem_pthread.dylib 0x00000001cfdd8778 0x1cfdce000 + 42872

Thread 0 crashed with arm64 Thread State:
x21: 0x0000000104a5b9a0 x2: 0x0000000000000000 x16: 0x0000000000000148 x3: 0x0000000000000000
x22: 0x0000000105705730 x4: 0x0000000000000008 x17: 0x0000000104a5b8c0 cpsr: 0x0000000040000000
x5: 0x00000001103cbc00 x23: 0x0000000107823950 x6: 0x0000000000000600 x18: 0x000000011a2f5d8c
x10: 0x0000000000bf3d00 lr: 0x00000001cfdd0b50 x7: 0x0000000000001d00 x24: 0x00000001103fa0c8
x11: 0x00000001103cc000 x8: 0x00000000000005b9 x19: 0x0000000000000006 x25: 0x000000010a84f348
x9: 0x86d5241ca1923076 x12: 0x0000000000004009 fp: 0x000000016db656c0 x26: 0x0000000107823a00
x13: 0x0000000000003fff pc: 0x00000001b2275414 x27: 0x0000000000000008 x14: 0x0000000000001e1d
x20: 0x0000000000000407 x0: 0x0000000000000000 sp: 0x000000016db656a0 x28: 0x00000001026abc9f
x15: 0x0000000000003318 x1: 0x0000000000000000

Binary Images:
0x0000000102294000 - 0x00000001045dbfff +TestApp.iOS arm64 /private/var/containers/Bundle/Application/27656804-415B-43AA-B094-0C311FDBC40D/TestApp.iOS.app/TestApp.iOS
0x0000000104930000 - 0x0000000104937fff +MDFInternationalization arm64 <89c3c1a37d893f2a8095c0709251b1aa> /private/var/containers/Bundle/Application/27656804-415B-43AA-B094-0C311FDBC40D/TestApp.iOS.app/Frameworks/MDFInternationalization.framework/MDFInternationalization
0x0000000104944000 - 0x000000010494bfff +MDFTextAccessibility arm64 <31ff5456976c30598ff7d21bcede1b8a> /private/var/containers/Bundle/Application/27656804-415B-43AA-B094-0C311FDBC40D/TestApp.iOS.app/Frameworks/MDFTextAccessibility.framework/MDFTextAccessibility
0x0000000104958000 - 0x0000000104963fff +MotionAnimator arm64 /private/var/containers/Bundle/Application/27656804-415B-43AA-B094-0C311FDBC40D/TestApp.iOS.app/Frameworks/MotionAnimator.framework/MotionAnimator
0x0000000104970000 - 0x0000000104977fff +MotionInterchange arm64 <2db66df13b893abdadb3f3c9e52e0b1d> /private/var/containers/Bundle/Application/27656804-415B-43AA-B094-0C311FDBC40D/TestApp.iOS.app/Frameworks/MotionInterchange.framework/MotionInterchange
0x0000000104984000 - 0x000000010498ffff +MotionTransitioning arm64 <3c30d94c72b23d5cbcba15ca06686e16> /private/var/containers/Bundle/Application/27656804-415B-43AA-B094-0C311FDBC40D/TestApp.iOS.app/Frameworks/MotionTransitioning.framework/MotionTransitioning
0x0000000104aa0000 - 0x0000000104f17fff +libSkiaSharp arm64 /private/var/containers/Bundle/Application/27656804-415B-43AA-B094-0C311FDBC40D/TestApp.iOS.app/Frameworks/libSkiaSharp.framework/libSkiaSharp
0x0000000104f78000 - 0x00000001050b3fff +MaterialComponents arm64 <5c3d09450aa932cca48acb35ead7f2f7> /private/var/containers/Bundle/Application/27656804-415B-43AA-B094-0C311FDBC40D/TestApp.iOS.app/Frameworks/MaterialComponents.framework/MaterialComponents
0x0000000183f59000 - 0x0000000183f93fff libdyld.dylib arm64e <21b19919133438bcb233896e929945e0> /usr/lib/system/libdyld.dylib
0x0000000184200000 - 0x00000001845b9fff CoreFoundation arm64e <727f2644eb4e3d57bc2ee6803ba92366> /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
0x0000000184924000 - 0x0000000184dbbfff CFNetwork arm64e <0ebb3119a8ce35da96245b5528802fc8> /System/Library/Frameworks/CFNetwork.framework/CFNetwork
0x0000000185541000 - 0x00000001857fcfff Foundation arm64e <7698bf3e0cf631c085e9562714f01276> /System/Library/Frameworks/Foundation.framework/Foundation
0x0000000186112000 - 0x00000001875bffff UIKitCore arm64e <8518eae3832b3ff09fa59dbe3041f26c> /System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore
0x00000001875e3000 - 0x0000000187869fff QuartzCore arm64e <8510f13908243686a9aa3e198539a021> /System/Library/Frameworks/QuartzCore.framework/QuartzCore
0x000000018bdd6000 - 0x000000018bdeefff AudioSession arm64e /System/Library/PrivateFrameworks/AudioSession.framework/AudioSession
0x000000018d6dd000 - 0x000000018d75bfff libsystem_c.dylib arm64e <961a8fb0de8a3567b4375d99cd549fae> /usr/lib/system/libsystem_c.dylib
0x000000019be61000 - 0x000000019be69fff GraphicsServices arm64e <1959c615fa0830de8461884a5bbc8037> /System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices
0x00000001b224d000 - 0x00000001b227efff libsystem_kernel.dylib arm64e /usr/lib/system/libsystem_kernel.dylib
0x00000001cfdce000 - 0x00000001cfdd9fff libsystem_pthread.dylib arm64e /usr/lib/system/libsystem_pthread.dylib

@Redth Redth removed the s/needs-info ❓ A question has been asked that requires an answer before work can continue on this issue. label May 11, 2021
@Kukkimonsuta
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We just encoutered this issue as well, it points to this code - _self.ElementForViewController(viewController); can evaluate to null which is not acceptable for navBarVisible = Shell.GetNavBarIsVisible(element);. I'll try to put together minimal repro project.

Xamarin.Forms/Xamarin.Forms.Platform.iOS/Renderers/ShellSectionRenderer.cs

Lines 622 to 628 in ad71f11

var element = _self.ElementForViewController(viewController);
bool navBarVisible;
if (element is ShellSection)
navBarVisible = _self._renderer.ShowNavBar;
else
navBarVisible = Shell.GetNavBarIsVisible(element);

@Kukkimonsuta
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Kukkimonsuta commented May 25, 2021 •
edited
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Minimal reproduction steps I've been able to find - https://github.com/Kukkimonsuta/xamarin-forms-14125 - keep clicking buttons till the problem occurs.

  1. use shell
  2. use Navigation.PushAsync to go to another page
  3. use Navigation.PushModalAsync to open modal
  4. run async handler (ex. button click) with some more async calls
  5. call Shell.Current.GoToAsync to another item

Bug occurs here: https://github.com/Kukkimonsuta/xamarin-forms-14125/blob/1b951c0a3cad5e97ccae5cc81b32605d4c933211/xamarin-forms-14125/Views/LogoutPage.xaml.cs#L17-L23

@hetcmnten
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I just encounter this as well, but only have some log from production so too hard to tell which step

@madtownchris
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This is a big problem for our app. 8x last 7 days and not very many users at the moment. Any workarounds? I tried making some other stuff in functions that call Shell.GoToAsync not async but it's unclear if that helps.

@InquisitorJax
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related? #14122
We're also seeing a bunch of these errors in App Center - unable to reproduce locally.

@jsuarezruiz jsuarezruiz mentioned this issue Oct 4, 2021
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@trj2059
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trj2059 commented Dec 29, 2022

This error is still being generated. Not only is it being generated for Xamarin forms, but we are seeing it in MAUI with .NET 6 and 7.

@WilliamWatterson86
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@trj2059 - did you find a solution for your maui issue? Seeing this in my project too

@1c3f0x84
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Created pull request for this in maui

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a/navbar a/shell 🐚 i/high Completely doesn't work, crashes, or is unusably slow, has no obvious workaround; occurs less often p/iOS 🍎 s/needs-repro ❔ This reported issue doesn't include a sample project reproducing the issue. Please provide one. s/unverified New report that has yet to be verified t/bug 🐛
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[iOS] Fix crash navigating in Shell and trying to get the navbar visibility xamarin/Xamarin.Forms
10 participants
@Redth @Kukkimonsuta @InquisitorJax @madtownchris @rachelkang @hetcmnten @trj2059 @WilliamWatterson86 @1c3f0x84 @inimirpaz