Search Unity

  1. Welcome to the Unity Forums! Please take the time to read our Code of Conduct to familiarize yourself with the forum rules and how to post constructively.
  2. We have updated the language to the Editor Terms based on feedback from our employees and community. Learn more.
    Dismiss Notice
  3. Join us on November 16th, 2023, between 1 pm and 9 pm CET for Ask the Experts Online on Discord and on Unity Discussions.
    Dismiss Notice
  4. Unite 2023 Registrations are now LIVE! We are thrilled to announce that Unite 2023 Registration is now live and open for all!
    Dismiss Notice
New Forum User Notice Update to the Unity Editor Software Terms Unite 2023 - Ask the Experts Online Unite 2023 Registrations are now LIVE!

Bug iPhone 10+ crash in deallocing an ARkit structure

Discussion in 'AR' started by ivoras, Mar 25, 2021.

  1. ivoras

    ivoras

    Joined:
    May 21, 2020
    Posts:
    66
    The code is working on an iPhone7 device, but on iPhone10+, it's crashing with SIGSEGV in "Thread 2" which isn't started by my code:

    Code (CSharp):
    1.  
    2. Thread 2 name:
    3. Thread 2 Crashed:
    4. 0   libobjc.A.dylib                   0x00000001ac268018 objc_release + 8 (NSObject.mm:1822)
    5. 1   CoreFoundation                    0x0000000197290c78 cow_cleanup + 144 (NSCollectionAux.h:48)
    6. 2   CoreFoundation                    0x000000019710d47c -[__NSDictionaryM dealloc] + 160 (NSCopyOnWrite.h:229)
    7. 3   CoreVideo                         0x000000019f889cc4 CVBuffer::finalize() + 56 (CVBufferInternal.cpp:69)
    8. 4   CoreVideo                         0x000000019f88b834 CVPixelBuffer::finalize() + 232 (CVPixelBufferInternal.cpp:309)
    9. 5   CoreFoundation                    0x00000001971ab104 _CFRelease + 248 (CFRuntime.c:2126)
    10. 6   ARKitCore                         0x00000001c2d052a0 -[ARImageData dealloc] + 60 (ARImageData.m:219)
    11. 7   ARKitCore                         0x00000001c2d97960 -[ARFrameContext .cxx_destruct] + 80 (ARFrameContext.m:41)
    12. 8   libobjc.A.dylib                   0x00000001ac248b10 object_cxxDestructFromClass(objc_object*, objc_class*) + 112 (objc-class.mm:455)
    13. 9   libobjc.A.dylib                   0x00000001ac25f840 objc_destructInstance + 80 (objc-class.mm:469)
    14. 10  libobjc.A.dylib                   0x00000001ac26680c _objc_rootDealloc + 80 (objc-runtime-new.mm:8131)
    15. 11  libobjc.A.dylib                   0x00000001ac248b10 object_cxxDestructFromClass(objc_object*, objc_class*) + 112 (objc-class.mm:455)
    16. 12  libobjc.A.dylib                   0x00000001ac25f840 objc_destructInstance + 80 (objc-class.mm:469)
    17. 13  libobjc.A.dylib                   0x00000001ac26680c _objc_rootDealloc + 80 (objc-runtime-new.mm:8131)
    18. 14  libobjc.A.dylib                   0x00000001ac248b10 object_cxxDestructFromClass(objc_object*, objc_class*) + 112 (objc-class.mm:455)
    19. 15  libobjc.A.dylib                   0x00000001ac25f840 objc_destructInstance + 80 (objc-class.mm:469)
    20. 16  libobjc.A.dylib                   0x00000001ac26680c _objc_rootDealloc + 80 (objc-runtime-new.mm:8131)
    21. 17  libobjc.A.dylib                   0x00000001ac248b10 object_cxxDestructFromClass(objc_object*, objc_class*) + 112 (objc-class.mm:455)
    22. 18  libobjc.A.dylib                   0x00000001ac25f840 objc_destructInstance + 80 (objc-class.mm:469)
    23. 19  libobjc.A.dylib                   0x00000001ac26680c _objc_rootDealloc + 80 (objc-runtime-new.mm:8131)
    24. 20  ARKitCore                         0x00000001c2df052c -[ARTechniqueParallelGatherContext captureGatheredData] + 1324 (ARTechniqueGatherContext.m:310)
    25. 21  ARKitCore                         0x00000001c2d76870 -[ARParentTechnique _submitResultsForTimestamp:context:] + 128 (ARParentTechnique.m:534)
    26. 22  libdispatch.dylib                 0x0000000196e21db0 _dispatch_client_callout + 20 (object.m:559)
    27. 23  libdispatch.dylib                 0x0000000196e2512c _dispatch_continuation_pop + 416 (inline_internal.h:2548)
    28. 24  libdispatch.dylib                 0x0000000196e36c08 _dispatch_source_invoke + 1260 (source.c:570)
    29. 25  libdispatch.dylib                 0x0000000196e28fd8 _dispatch_lane_serial_drain + 272 (inline_internal.h:2589)
    30. 26  libdispatch.dylib                 0x0000000196e29c90 _dispatch_lane_invoke + 460 (queue.c:3862)
    31. 27  libdispatch.dylib                 0x0000000196e2ae60 _dispatch_workloop_invoke + 1588 (inline_internal.h:2589)
    32. 28  libdispatch.dylib                 0x0000000196e33d78 _dispatch_workloop_worker_thread + 708 (queue.c:6601)
    33. 29  libsystem_pthread.dylib           0x00000001e2cdd814 _pthread_wqthread + 276 (pthread.c:2211)
    34. 30  libsystem_pthread.dylib           0x00000001e2ce476c start_wqthread + 8
    35.  
    It looks like a double free or a null pointer reference in ARFrameContext or thereabouts.

    This is on Unity 2021.1.0f1, AR Kit and Foundation 4.1.5.

    Is there a better forum I can submit a bug report?
     
    ivoras, Mar 25, 2021
    #1

  2. TreyK-47

    TreyK-47

    Unity Technologies

    Joined:
    Oct 22, 2019
    Posts:
    1,796
    TreyK-47, Apr 22, 2021
    #2

  3. normus28

    normus28

    Joined:
    Feb 16, 2014
    Posts:
    5
    I have the same problem my app crashes in thread 47

    Code (CSharp):
    1.  
    Here is crash log (sorry for pastern but this forum wouldn't allow me to post it here) : https://pastebin.com/yhjrcuCB

    What is causing it and is there any fix for it?:
     
    normus28, Nov 17, 2021
    #3