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Bug null pointer dereference - (ParticleSystemParticles::CopyToArrayAOS) after Unity Update

Discussion in 'Universal Render Pipeline' started by Meatloaf4, Apr 12, 2023.

  1. Meatloaf4

    Meatloaf4

    Joined:
    Jul 30, 2013
    Posts:
    183
    Hello I think I may be experiencing a bug in Unity due to the way I am saving and reloading particles between physics scenes.

    First off here is the error I am getting.

    Android Logs
    Code (CSharp):
    1. 04-12 09:28:01.812  3437  3538 E CRASH   : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
    2. 04-12 09:28:01.812  3437  3538 E CRASH   : Version '2020.3.46f1 (18bc01a066b4)', Build type 'Development', Scripting Backend 'il2cpp', CPU 'arm64-v8a'
    3. 04-12 09:28:01.812  3437  3538 E CRASH   : Build fingerprint: 'google/raven/raven:13/TQ2A.230305.008.E1/9677224:user/release-keys'
    4. 04-12 09:28:01.812  3437  3538 E CRASH   : Revision: 'MP1.0'
    5. 04-12 09:28:01.812  3437  3538 E CRASH   : ABI: 'arm64'
    6. 04-12 09:28:01.812  3437  3538 E CRASH   : Timestamp: 2023-04-12 09:28:01-0700
    7. 04-12 09:28:01.812  3437  3538 E CRASH   : pid: 3437, tid: 3538, name: Job.Worker 2  >>> com.breakstepstudios.commandcenterearth <<<
    8. 04-12 09:28:01.812  3437  3538 E CRASH   : uid: 10427
    9. 04-12 09:28:01.812  3437  3538 E CRASH   : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x204
    10. 04-12 09:28:01.812  3437  3538 E CRASH   : Cause: null pointer dereference
    11. 04-12 09:28:01.812  3437  3538 E CRASH   :     x0  0000007671d95230  x1  000000772b467748  x2  0000000000000001  x3  0000000000000081
    12. 04-12 09:28:01.812  3437  3538 E CRASH   :     x4  000000772b4688a0  x5  000000772b4677d8  x6  000000006a1a66eb  x7  00000076d0027280
    13. 04-12 09:28:01.812  3437  3538 E CRASH   :     x8  0000000000000204  x9  000000772b46776c  x10 0000000000000000  x11 000000772b467778
    14. 04-12 09:28:01.812  3437  3538 E CRASH   :     x12 0000000000000001  x13 000000772b467748  x14 0000000000000204  x15 41d8cc8241f09564
    15. 04-12 09:28:01.812  3437  3538 E CRASH   :     x16 0000000000000000  x17 0000007a63a10fe0  x18 0000000000002ede  x19 000000772b467748
    16. 04-12 09:28:01.812  3437  3538 E CRASH   :     x20 0000007671d95230  x21 0000000000000000  x22 0000000000000081  x23 0000000000000001
    17. 04-12 09:28:01.812  3437  3538 E CRASH   :     x24 0000007671d95848  x25 000000772b4677c0  x26 0000000000000084  x27 0000007723771e30
    18. 04-12 09:28:01.812  3437  3538 E CRASH   :     x28 0000000000000081  x29 0000000000000002
    19. 04-12 09:28:01.812  3437  3538 E CRASH   :     sp  000000772b4676d0  lr  000000772298bf48  pc  00000077227eca44
    20. 04-12 09:28:01.812  3437  3538 E CRASH   : backtrace:
    21. 04-12 09:28:01.812  3437  3538 E CRASH   :       #00 pc 0000000000b6fa44  /data/app/~~RDoVFOH7CHhukFChKdwo_Q==/com.breakstepstudios.commandcenterearth-pqs_0V62gpIYLagrpQRwEw==/lib/arm64/libunity.so (ParticleSystemParticles::CopyToArrayAOS(ParticleSystemParticle*, int, int) const+176) (BuildId: 4e68e86bbb46cea51faef290d2c29a1f596cb4b6)
    22. 04-12 09:28:01.813  3437  3538 E CRASH   :       #01 pc 0000000000d0ef44  /data/app/~~RDoVFOH7CHhukFChKdwo_Q==/com.breakstepstudios.commandcenterearth-pqs_0V62gpIYLagrpQRwEw==/lib/arm64/libunity.so (ParticleSystemTrailGeometryJob::ConfigurePerParticleTrailParams(ParticleLineParameters&, ParticleSystemParticles const*, unsigned long, ParticleSystemTrailGeometryJob const&, float)+56) (BuildId: 4e68e86bbb46cea51faef290d2c29a1f596cb4b6)
    23. 04-12 09:28:01.813  3437  3538 E CRASH   :       #02 pc 0000000000d0daf8  /data/app/~~RDoVFOH7CHhukFChKdwo_Q==/com.breakstepstudios.commandcenterearth-pqs_0V62gpIYLagrpQRwEw==/lib/arm64/libunity.so (ParticleSystemTrailGeometryJob::RenderJobCommon(ParticleSystemTrailGeometryJob&, void*, unsigned int)+1608) (BuildId: 4e68e86bbb46cea51faef290d2c29a1f596cb4b6)
    24. 04-12 09:28:01.813  3437  3538 E CRASH   :       #03 pc 0000000000d0cca4  /data/app/~~RDoVFOH7CHhukFChKdwo_Q==/com.breakstepstudios.commandcenterearth-pqs_0V62gpIYLagrpQRwEw==/lib/arm64/libunity.so (ParticleSystemTrailGeometryJob::RenderJob(SharedGeometryJobData*, unsigned int)+100) (BuildId: 4e68e86bbb46cea51faef290d2c29a1f596cb4b6)
    25. 04-12 09:28:01.813  3437  3538 E CRASH   :       #04 pc 00000000005030a0  /data/app/~~RDoVFOH7CHhukFChKdwo_Q==/com.breakstepstudios.commandcenterearth-pqs_0V62gpIYLagrpQRwEw==/lib/arm64/libunity.so (JobQueue::Exec(JobInfo*, long long, int, bool)+120) (BuildId: 4e68e86bbb46cea51faef290d2c29a1f596cb4b6)
    26. 04-12 09:28:01.813  3437  3538 E CRASH   :       #05 pc 0000000000503388  /data/app/~~RDoVFOH7CHhukFChKdwo_Q==/com.breakstepstudios.commandcenterearth-pqs_0V62gpIYLagrpQRwEw==/lib/arm64/libunity.so (JobQueue::Steal(JobGroup*, JobInfo*, long long, int, bool, bool)+344) (BuildId: 4e68e86bbb46cea51faef290d2c29a1f596cb4b6)
    27. 04-12 09:28:01.813  3437  3538 E CRASH   :       #06 pc 00000000005034ec  /data/app/~~RDoVFOH7CHhukFChKdwo_Q==/com.breakstepstudios.commandcenterearth-pqs_0V62gpIYLagrpQRwEw==/lib/arm64/libunity.so (JobQueue::ExecuteJobFromQueue(bool, bool&)+172) (BuildId: 4e68e86bbb46cea51faef290d2c29a1f596cb4b6)
    28. 04-12 09:28:01.813  3437  3538 E CRASH   :       #07 pc 0000000000503958  /data/app/~~RDoVFOH7CHhukFChKdwo_Q==/com.breakstepstudios.commandcenterearth-pqs_0V62gpIYLagrpQRwEw==/lib/arm64/libunity.so (JobQueue::ProcessJobs(JobQueue::ThreadInfo*, void*)+912) (BuildId: 4e68e86bbb46cea51faef290d2c29a1f596cb4b6)
    29. 04-12 09:28:01.813  3437  3538 E CRASH   :       #08 pc 0000000000502a48  /data/app/~~RDoVFOH7CHhukFChKdwo_Q==/com.breakstepstudios.commandcenterearth-pqs_0V62gpIYLagrpQRwEw==/lib/arm64/libunity.so (JobQueue::WorkLoop(void*)+228) (BuildId: 4e68e86bbb46cea51faef290d2c29a1f596cb4b6)
    30. 04-12 09:28:01.814  3437  3538 E CRASH   :       #09 pc 00000000007044f4  /data/app/~~RDoVFOH7CHhukFChKdwo_Q==/com.breakstepstudios.commandcenterearth-pqs_0V62gpIYLagrpQRwEw==/lib/arm64/libunity.so (Thread::RunThreadWrapper(void*)+512) (BuildId: 4e68e86bbb46cea51faef290d2c29a1f596cb4b6)
    31. 04-12 09:28:01.814  3437  3538 E CRASH   :       #10 pc 00000000000c226c  /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+204) (BuildId: dc4001c2ef2dfc23467040797a96840c)
    32. 04-12 09:28:01.814  3437  3538 E CRASH   :       #11 pc 0000000000054a30  /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) (BuildId: dc4001c2ef2dfc23467040797a96840c)
    And here is how I am saving and loading my particle system state (including trails)

    ParticleSystemExtensions (Save & Restore Snapshots)
    Code (CSharp):
    1. using UnityEngine;
    2.  
    3. namespace StudioName.Runtime.ExtensionAndHelpers
    4. {
    5.     /// <summary>
    6.     /// Extends the <see cref="UnityEngine.ParticleSystem"/> class with additional functionality
    7.     /// </summary>
    8.     public static class ParticleSystemExtensions
    9.     {
    10.         /// <summary>
    11.         /// Saves this point in time for the particle system in order to restore to this point in time later
    12.         /// </summary>
    13.         /// <param name="particleSystem">The particle system we are operating on</param>
    14.         /// <param name="withChildren">If true will also snapshot the child particle systems as well, false will only save this particle system.</param>
    15.         /// <returns>The snapshot/s to restore to later. If withChildren is false only first element will be filled</returns>
    16.         public static ParticleSystemSnapshot[] SaveSnapshot(this ParticleSystem particleSystem, bool withChildren = true)
    17.         {
    18.             //don't save children so only snapshot current particle system
    19.             if (!withChildren)
    20.             {
    21.                 return new[] { SaveSnapshotInternal(particleSystem) };
    22.             }
    23.          
    24.             //we want to save children as well so loop through and snapshot all of them returning them in order snapshotted
    25.             var particleSystems = particleSystem.GetComponentsInChildren<ParticleSystem>();
    26.             var snapshots = new ParticleSystemSnapshot[particleSystems.Length];
    27.             for (var i = 0; i < particleSystems.Length; i++)
    28.             {
    29.                 snapshots[i] = particleSystems[i].SaveSnapshotInternal();
    30.             }
    31.          
    32.             return snapshots;
    33.         }
    34.  
    35.         /// <summary>
    36.         /// Restore the particle system to the point in time provided by the snapshots
    37.         /// </summary>
    38.         /// <param name="particleSystem">The particle system we are operating on</param>
    39.         /// <param name="snapshots">The snapshot/s in time to restore the particle system (and potentially it's children) to. If withChildren = false only one particle system need be specified</param>
    40.         /// <param name="withChildren">If true will also restore the children with the snapshots provided, false will only restore this particle system</param>
    41.         public static void RestoreSnapshot(this ParticleSystem particleSystem, ParticleSystemSnapshot[] snapshots, bool withChildren = true)
    42.         {
    43.             if (!withChildren)
    44.             {
    45.                 //throw an exception if we don't at least have one snapshot
    46.                 if (snapshots.Length <= 0)
    47.                 {
    48.                     throw new System.Exception("No snapshots provided to restore to");
    49.                 }
    50.                 particleSystem.RestoreSnapshotInternal(snapshots[0]);
    51.                 return;
    52.             }
    53.          
    54.             var particleSystems = particleSystem.GetComponentsInChildren<ParticleSystem>();
    55.             //throw an exception if we don't have the same number of snapshots as particle systems
    56.             //TODO we may not want to throw an exception here as maybe they only want to restore a subset of particle systems
    57.             if (snapshots.Length < particleSystems.Length)
    58.             {
    59.                 throw new System.Exception("Number of snapshots provided does not match number of particle systems.");
    60.             }
    61.          
    62.             //restore all of our child particle system
    63.             for(var i = 0; i < particleSystems.Length; i++)
    64.             {
    65.                 particleSystems[i].RestoreSnapshotInternal(snapshots[i]);
    66.             }
    67.         }
    68.  
    69.         /// <summary>
    70.         /// Restore the particle system to this point in time
    71.         /// </summary>
    72.         /// <param name="particleSystem">The particle system we are operating on</param>
    73.         /// <param name="snapshot">The snapshot in time to restore the particle system to</param>
    74.         public static void RestoreSnapshotInternal(this ParticleSystem particleSystem, ParticleSystemSnapshot snapshot)
    75.         {
    76.             particleSystem.SetPlaybackState(snapshot.playbackState);
    77.             particleSystem.SetParticles(snapshot.particles, snapshot.particles.Length);
    78.             particleSystem.SetTrails(snapshot.trails);
    79.             //TODO the below may be buggy, double check returning to correct play state is working as it's supposed to later
    80.             //if our particle was stopped when we saved our snapshot that means no particles were alive so clear them all
    81.             //and don't continue below
    82.             if(snapshot.isStopped)
    83.             {
    84.                 particleSystem.Stop(false, ParticleSystemStopBehavior.StopEmittingAndClear);
    85.                 return;
    86.             }
    87.             //if we are paused we are not playing or emitting
    88.             if (snapshot.isPaused)
    89.             {
    90.                 particleSystem.Pause(false);
    91.                 return;
    92.             }
    93.             //if we were playing ensure we start things back up again
    94.             if (snapshot.isPlaying)
    95.             {
    96.                 particleSystem.Play(false);
    97.             }
    98.             //we may have been playing but called Stop(ParticleSystemStopBehavior.StopEmitting) when we saved the snapshot
    99.             //bottom line make sure to stop emitting if that's what we were doing when snapshot was saved
    100.             if (!snapshot.isEmitting)
    101.             {
    102.                 particleSystem.Stop(false, ParticleSystemStopBehavior.StopEmitting);
    103.             }
    104.         }
    105.      
    106.         private static ParticleSystemSnapshot SaveSnapshotInternal(this ParticleSystem particleSystem)
    107.         {
    108.             var playbackState = particleSystem.GetPlaybackState();
    109.             var particles = new ParticleSystem.Particle[particleSystem.particleCount];
    110.             particleSystem.GetParticles(particles);
    111.             var trails = particleSystem.GetTrails();
    112.             return new ParticleSystemSnapshot
    113.             {
    114.                 playbackState = playbackState,
    115.                 particles = particles,
    116.                 trails = trails,
    117.                 isEmitting = particleSystem.isEmitting,
    118.                 isPlaying = particleSystem.isPlaying,
    119.                 isPaused = particleSystem.isPaused,
    120.                 isStopped = particleSystem.isStopped,
    121.             };
    122.         }
    123.      
    124.         /// <summary>
    125.         /// A snapshot of a point in time for a given particle system
    126.         /// </summary>
    127.         public struct ParticleSystemSnapshot
    128.         {
    129.             /// <summary>
    130.             /// The playback state of the particle system snapshot
    131.             /// </summary>
    132.             public ParticleSystem.PlaybackState playbackState;
    133.             /// <summary>
    134.             /// The particles of the particle system snapshot
    135.             /// </summary>
    136.             public ParticleSystem.Particle[] particles;
    137.             /// <summary>
    138.             /// The trails of the particle system snapshot
    139.             /// </summary>
    140.             public ParticleSystem.Trails trails;
    141.             /// <summary>
    142.             /// Is the particle system emitting particles. See <see cref="ParticleSystem.isEmitting"/>
    143.             /// </summary>
    144.             public bool isEmitting;
    145.             /// <summary>
    146.             /// Is the particle system playing. See <see cref="ParticleSystem.isPlaying"/>
    147.             /// </summary>
    148.             public bool isPlaying;
    149.             /// <summary>
    150.             /// Is the particle system paused. See <see cref="ParticleSystem.isPaused"/>
    151.             /// </summary>
    152.             public bool isPaused;
    153.             /// <summary>
    154.             /// Is the particle system stopped. See <see cref="ParticleSystem.isStopped"/>
    155.             /// </summary>
    156.             public bool isStopped;
    157.         }
    158.     }
    159. }
    The code works fine on Unity 2020.3.12f1 but once I upgraded to Unity 2020.3.46f1 I ran into this issue. Another important change is that I did start targeting Android version 31 once I updated Unity (the reason I updated to begin with).

    That said I wonder if this bug is occurring as a result of this fix?

    https://issuetracker.unity3d.com/is...m-dot-gettrails-api-forces-gc-dot-alloc-calls

    Finally to give some context I use my extensions to save a my "particle snapshot" on one physics 2d scene and restore the "particle snapshot" when the object is moved into another physics 2d scene.

    The strange part (and why I think it's a bug) is because it will work fine sometimes and crash the game seemingly randomly other times.

    From what I can tell I'm using the API correctly, but perhaps someone can shed light on if I'm doing something that would produce this error.
     
    Meatloaf4, Apr 12, 2023
    #1

  2. Meatloaf4

    Meatloaf4

    Joined:
    Jul 30, 2013
    Posts:
    183
    So after some investigation this looks to only be occurring on Android.

    Also, after I cleared the app cache and data it looks like the bug has disappeared. However, it is possible the bug just hasn't manifested again yet.

    I wonder if some Unity / Android expert could chime in here and shed some light on if clearing the app cache / data could have fixed the bug. I have had instances where an old cache has manifested issues. Which is why I ask.

    Thanks for any help in advance!
     
    Meatloaf4, Apr 12, 2023
    #2

  3. Meatloaf4

    Meatloaf4

    Joined:
    Jul 30, 2013
    Posts:
    183
    I was wrong about this only occuring on Android. The bug is now appearing on iOS as well. Here are the logs below.

    Code (CSharp):
    1. # Crashlytics - Stack trace
    2. # Application: com.breakstepstudios.commandcenterearth
    3. # Platform: apple
    4. # Version: 2.0.2 (55)
    5. # Issue: 3d54a001d269d52bb25edb73a9d4f1df
    6. # Session: 561227cd15f84ad484b158d4da6da1a7_DNE_0_v2
    7. # Date: Wed May 03 2023 15:22:01 GMT-0700 (Pacific Daylight Time)
    8.  
    9. com.apple.main-thread
    10. 0  libsystem_kernel.dylib         0xd24 semaphore_wait_trap + 8
    11. 1  libdispatch.dylib              0x4524 _dispatch_sema4_wait + 28
    12. 2  libdispatch.dylib              0x4bd8 _dispatch_semaphore_wait_slow + 132
    13. 3  UnityFramework                 0xef5150 UnityClassic::Baselib_SystemSemaphore_Acquire(UnityClassic::Baselib_SystemSemaphore_Handle) + 36 (Baselib_SystemSemaphore_DarwinApi.inl.h:36)
    14. 4  UnityFramework                 0x9b1408 JobQueue::WaitForJobGroupID(JobGroupID, JobQueue::JobQueueWorkStealMode) + 1841 (JobQueue.cpp:1841)
    15. 5  UnityFramework                 0x9aee74 CompleteFenceInternal(JobFence&, WorkStealMode) + 17 (Jobs.cpp:17)
    16. 6  UnityFramework                 0x6d92e8 ParticleSystemManager::ClearAllFences(bool) + 848428 (ParticleSystem.cpp:848428)
    17. 7  UnityFramework                 0x6d8fd8 ParticleSystem::SyncJobs(bool) + 661 (ParticleSystem.cpp:661)
    18. 8  UnityFramework                 0x6d8ebc ParticleSystem::Deactivate(DeactivateOperation) + 1914 (ParticleSystem.cpp:1914)
    19. 9  UnityFramework                 0x861f04 GameObject::ActivateAwakeRecursivelyInternal(DeactivateOperation, AwakeFromLoadQueue&) + 198 (GameObject.cpp:198)
    20. 10 UnityFramework                 0x861e8c GameObject::ActivateAwakeRecursivelyInternal(DeactivateOperation, AwakeFromLoadQueue&) + 191 (GameObject.cpp:191)
    21. 11 UnityFramework                 0x861e8c GameObject::ActivateAwakeRecursivelyInternal(DeactivateOperation, AwakeFromLoadQueue&) + 191 (GameObject.cpp:191)
    22. 12 UnityFramework                 0x861e8c GameObject::ActivateAwakeRecursivelyInternal(DeactivateOperation, AwakeFromLoadQueue&) + 191 (GameObject.cpp:191)
    23. 13 UnityFramework                 0x861e8c GameObject::ActivateAwakeRecursivelyInternal(DeactivateOperation, AwakeFromLoadQueue&) + 191 (GameObject.cpp:191)
    24. 14 UnityFramework                 0x861fac GameObject::ActivateAwakeRecursively(DeactivateOperation) + 225 (GameObject.cpp:225)
    25. 15 UnityFramework                 0x9e8124 UnityScene::HandleChangingPhysicsScenes(GameObject&, UnityScene*, UnityScene*) + 574 (UnityScene.cpp:574)
    26. 16 UnityFramework                 0x9e7704 UnityScene::OnGameObjectChangedScene(GameObject&, UnityScene*, UnityScene*) + 322 (UnityScene.cpp:322)
    27. 17 UnityFramework                 0xb365a4 SceneManager_CUSTOM_MoveGameObjectToScene_Injected(ScriptingBackendNativeObjectPtrOpaque*, int const&) + 65 (ScriptingNativeTypes.h:65)
    28. 18 UnityFramework                 0x2f94564 selector_thread(void*) (.cold.1) + 4524705124
    29. 19 UnityFramework                 0x1486628 selector_thread(void*) (.cold.1) + 4496336424
    30. 20 UnityFramework                 0x25c2274 selector_thread(void*) (.cold.1) + 4514407028
    31. 21 UnityFramework                 0x25e7510 selector_thread(void*) (.cold.1) + 4514559248
    32. 22 UnityFramework                 0x25c0650 selector_thread(void*) (.cold.1) + 4514399824
    33. 23 UnityFramework                 0x25b6eec selector_thread(void*) (.cold.1) + 4514361068
    34. 24 UnityFramework                 0x25c09c4 selector_thread(void*) (.cold.1) + 4514400708
    35. 25 UnityFramework                 0x25c07e4 selector_thread(void*) (.cold.1) + 4514400228
    36. 26 UnityFramework                 0x153c2f8 selector_thread(void*) (.cold.1) + 4497081080
    37. 27 UnityFramework                 0x152e3fc selector_thread(void*) (.cold.1) + 4497023996
    38. 28 UnityFramework                 0x152e0d4 selector_thread(void*) (.cold.1) + 4497023188
    39. 29 UnityFramework                 0x153c0b4 selector_thread(void*) (.cold.1) + 4497080500
    40. 30 UnityFramework                 0x153d1f8 selector_thread(void*) (.cold.1) + 4497084920
    41. 31 UnityFramework                 0x1541b74 selector_thread(void*) (.cold.1) + 4497103732
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    263. 4  UnityFramework                 0x9b0708 JobQueue::ProcessJobs(JobQueue::ThreadInfo*, void*) + 33 (Baselib_CappedSemaphore_SemaphoreBased.inl.h:33)
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    486. 6  UnityFramework                 0x32b9394 selector_thread(void*) (.cold.1) + 4528001940
    487. 7  UnityFramework                 0x3223c6c selector_thread(void*) (.cold.1) + 4527389804
    488. 8  UnityFramework                 0x3269af4 selector_thread(void*) (.cold.1) + 4527676148
    489. 9  UnityFramework                 0x3323434 selector_thread(void*) (.cold.1) + 4528436276
    490. 10 UnityFramework                 0x3223c6c selector_thread(void*) (.cold.1) + 4527389804
    491. 11 UnityFramework                 0x11308c RuntimeInvoker_TrueVoid_t700C6383A2A510C2CF4DD86DABD5CA9FF70ADAC5(void (*)(), MethodInfo const*, void*, void**) + 4475941004 (Il2CppInvokerTable.cpp:4475941004)
    492. 12 UnityFramework                 0x1306fcc il2cpp::vm::Runtime::Invoke(MethodInfo const*, void*, void**, Il2CppException**) + 564 (Runtime.cpp:564)
    493. 13 UnityFramework                 0x12b8ee8 il2cpp::icalls::mscorlib::System::Threading::ThreadStart(void*) + 158 (Thread.cpp:158)
    494. 14 UnityFramework                 0x12c5d30 il2cpp::os::Thread::RunWrapper(void*) + 183 (Thread.cpp:183)
    495. 15 UnityFramework                 0x12c7fe0 il2cpp::os::ThreadImpl::ThreadStartWrapper(void*) + 127 (ThreadImpl.cpp:127)
    496. 16 libsystem_pthread.dylib        0x16cc _pthread_start + 148
    497. 17 libsystem_pthread.dylib        0xba4 thread_start + 8
    498.  
    499. Thread
    500. 0  libsystem_kernel.dylib         0x12b0 __workq_kernreturn + 8
    501. 1  libsystem_pthread.dylib        0xe44 _pthread_wqthread + 364
    502. 2  libsystem_pthread.dylib        0xb98 start_wqthread + 8
    503.  
    504. IL2CPP Threadpool worker
    505. 0  libsystem_kernel.dylib         0x167c __psynch_cvwait + 8
    506. 1  libsystem_pthread.dylib        0x806c _pthread_cond_wait + 1232
    507. 2  UnityFramework                 0x12cdf14 il2cpp::os::ConditionVariableImpl::TimedWait(il2cpp::os::FastMutexImpl*, unsigned int) + 51 (ConditionVariableImpl.cpp:51)
    508. 3  UnityFramework                 0x12c46b0 worker_thread(void*) + 87 (ThreadPoolWorkerThread.cpp:87)
    509. 4  UnityFramework                 0x12f6770 il2cpp::vm::ThreadStart(void*) + 727 (Thread.cpp:727)
    510. 5  UnityFramework                 0x12c5d30 il2cpp::os::Thread::RunWrapper(void*) + 183 (Thread.cpp:183)
    511. 6  UnityFramework                 0x12c7fe0 il2cpp::os::ThreadImpl::ThreadStartWrapper(void*) + 127 (ThreadImpl.cpp:127)
    512. 7  libsystem_pthread.dylib        0x16cc _pthread_start + 148
    513. 8  libsystem_pthread.dylib        0xba4 thread_start + 8
    514.  
    515. IL2CPP Threadpool worker
    516. 0  libsystem_kernel.dylib         0x167c __psynch_cvwait + 8
    517. 1  libsystem_pthread.dylib        0x806c _pthread_cond_wait + 1232
    518. 2  UnityFramework                 0x12cdf14 il2cpp::os::ConditionVariableImpl::TimedWait(il2cpp::os::FastMutexImpl*, unsigned int) + 51 (ConditionVariableImpl.cpp:51)
    519. 3  UnityFramework                 0x12c46b0 worker_thread(void*) + 87 (ThreadPoolWorkerThread.cpp:87)
    520. 4  UnityFramework                 0x12f6770 il2cpp::vm::ThreadStart(void*) + 727 (Thread.cpp:727)
    521. 5  UnityFramework                 0x12c5d30 il2cpp::os::Thread::RunWrapper(void*) + 183 (Thread.cpp:183)
    522. 6  UnityFramework                 0x12c7fe0 il2cpp::os::ThreadImpl::ThreadStartWrapper(void*) + 127 (ThreadImpl.cpp:127)
    523. 7  libsystem_pthread.dylib        0x16cc _pthread_start + 148
    524. 8  libsystem_pthread.dylib        0xba4 thread_start + 8
    As you can see the UnityGfxDeviceWorker crashes when copying the particle system.
     
    Meatloaf4, May 4, 2023
    #3

  4. Meatloaf4

    Meatloaf4

    Joined:
    Jul 30, 2013
    Posts:
    183
    This is a really big issue for me and would really appreciate someone form Unity chiming in.

    Thanks in advance!
     
    Meatloaf4, May 10, 2023
    #4

  5. Alan-Liu

    Alan-Liu

    Joined:
    Jan 23, 2014
    Posts:
    392
    Hi,
    I encountered a similar issue about ParticleSystem before: https://forum.unity.com/threads/uni...rticlesystemgeometryjob.1378722/#post-8789266.

    Based on the callstack of crash and your code, I created a minimal project to reproduce the issue using Unity 2020.3.47.

    Here is the code (Full project is in the attachment below):
    Code (CSharp):
    1. public class Test : MonoBehaviour
    2. {
    3.     public GameObject Prefab;
    4.     public int MaxCount;
    5.     public int BatchSize;
    6.     public int[] RandomFrameRange;
    7.  
    8.     private void Start()
    9.     {
    10.         Application.runInBackground = true;
    11.  
    12.         for (int i = 0; i < MaxCount / BatchSize; ++i)
    13.             StartCoroutine(Execute(BatchSize));
    14.     }
    15.  
    16.     private IEnumerator Execute(int batchSize)
    17.     {
    18.         var pss = new List<ParticleSystem>(batchSize);
    19.  
    20.         while (true)
    21.         {
    22.             for (int i = 0; i < batchSize; ++i)
    23.             {
    24.                 var go = Instantiate(Prefab);
    25.                 var ps = go.GetComponent<ParticleSystem>();
    26.                 pss.Add(ps);
    27.             }
    28.  
    29.             int frames = Random.Range(RandomFrameRange[0], RandomFrameRange[1]);
    30.             while (frames-- > 0)
    31.                 yield return null;
    32.  
    33.             for (int i = 0; i < batchSize; ++i)
    34.             {
    35.                 var particles = new ParticleSystem.Particle[pss[i].particleCount];
    36.                 pss[i].GetParticles(particles);
    37.             }
    38.  
    39.             frames = 5;
    40.             while (frames-- > 0)
    41.                 yield return null;
    42.  
    43.             for (int i = 0; i < batchSize; ++i)
    44.             {
    45.                 Destroy(pss[i]);
    46.             }
    47.  
    48.             pss.Clear();
    49.  
    50.             yield return null;
    51.         }
    52.     }
    53. }
    54.  
    The project can reproduce the issue in minutes on the following devices:
    • Mi 10
    • Redmi 8A
    • iPhone 6s

    I think it's an issue about race condition: some data is being created when ParticleSystem.GetParticles is called, and at the same time, ParticleSystemParticles::CopyToArrayAOS tries to use that data.

    The project has been submitted to Unity: IN-40907.
     

    Attached Files:

    Last edited: May 15, 2023
    Alan-Liu, May 12, 2023
    #5

  6. Alan-Liu

    Alan-Liu

    Joined:
    Jan 23, 2014
    Posts:
    392
    As a workaround, you can try to use ParticleSystem.Simulate before calling ParticleSystem.GetParticles. ParticleSystem.Simulate will sync with render job internally, so it should avoid ParticleSystem.GetParticles and render job from running simultaneously:
    Code (CSharp):
    1. for (int i = 0; i < batchSize; ++i)
    2. {
    3.     var particles = new ParticleSystem.Particle[pss[i].particleCount];
    4.     pss[i].Simulate(0, true, false);  // <----
    5.     pss[i].GetParticles(particles);
    6. }
     
    Last edited: May 15, 2023
    Alan-Liu, May 12, 2023
    #6

  7. Alan-Liu

    Alan-Liu

    Joined:
    Jan 23, 2014
    Posts:
    392
    Alan-Liu, Jun 21, 2023
    #7