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Often exceptions on some devices of the UWP build of our game

Discussion in 'Windows' started by _creatio_, Jan 10, 2019.

  1. _creatio_

    _creatio_

    Joined:
    Mar 21, 2013
    Posts:
    43
    Hello.
    We're having often exceptions on some devices (around 10%).
    The game was built using: Unity 2017.4.16f1

    Frame   Image   Function   Offset
    
0   GameAssembly.dll   GC_win32_get_mem   0x0000000000000062   
    
1   GameAssembly.dll   GC_expand_hp_inner   0x0000000000000041   
    
2   GameAssembly.dll   GC_collect_or_expand   0x0000000000000106   
    
3   GameAssembly.dll   GC_allocobj   0x0000000000000237   
    
4   GameAssembly.dll   GC_generic_malloc_inner   0x00000000000001AC   
    
5   GameAssembly.dll   GC_gcj_malloc   0x0000000000000076   
    
6   GameAssembly.dll   il2cpp::vm::Object::New   0x0000000000000095   
    
7   GameAssembly.dll   Scheduler_SchedulerThread_m10185948   0x0000000000000220   
    
8   GameAssembly.dll   ThreadStart_Invoke_m1483406622   0x00000000000001F0   
    
9   GameAssembly.dll   ThreadHelper_ThreadStart_Context_m3608880784   0x0000000000000092   
    
10   GameAssembly.dll   XmlSerializationFixupCallback_Invoke_m2868721911   0x0000000000000204   
    
11   GameAssembly.dll   ExecutionContext_RunInternal_m3256186641   0x00000000000001C8   
    
12   GameAssembly.dll   ExecutionContext_Run_m1300924372   0x00000000000000A7   
    
13   GameAssembly.dll   ThreadHelper_ThreadStart_m3843940947   0x00000000000000A8   
    
14   GameAssembly.dll   ThreadStart_Invoke_m1483406622   0x00000000000001F0   
    
15   GameAssembly.dll   RuntimeInvoker_Void_t1185182177   0x000000000000000C   
    
16   GameAssembly.dll   il2cpp::vm::Runtime::Invoke   0x000000000000004F   
    
17   GameAssembly.dll   il2cpp::vm::Runtime::DelegateInvoke   0x0000000000000022   
    
18   GameAssembly.dll   il2cpp::icalls::mscorlib::System::Threading::ThreadStart   0x000000000000007A   
    
19   GameAssembly.dll   il2cpp::os::Thread::RunWrapper   0x0000000000000060   
    
20   GameAssembly.dll   il2cpp::os::ThreadStartWrapper   0x000000000000002E   
    
21   kernel32.dll   BaseThreadInitThunk   0x0000000000000024   
    
22   ntdll.dll   __RtlUserThreadStart   0x000000000000002F   
    
23   ntdll.dll   _RtlUserThreadStart   0x000000000000001B


    The build config is:
    uwp_config.png

    The main problem is that it never happen in the development environment and doesn't seem to happen on other platforms where our game is published (like Steam, and mobiles).
    What can we do to find the cause and fix the issue?
     
    _creatio_, Jan 10, 2019
    #1

  2. Tautvydas-Zilys

    Tautvydas-Zilys

    Unity Technologies

    Joined:
    Jul 25, 2013
    Posts:
    10,678
    Is your game 32-bit? That sounds like an out of memory crash.
     
    Tautvydas-Zilys, Jan 10, 2019
    #2

  3. _creatio_

    _creatio_

    Joined:
    Mar 21, 2013
    Posts:
    43
    Thank you for fast response!

    Yes, it is, but the game is not RAM-hungry. So it should never ever reach the limit (otherwize, I suspect that we woould have much more than 10% of problematic game sessions). On my PC it's peak RAM load is around 260MBs. So out of memory is hard to imagine, especially on PCs with Core i5 and i7 CPUs (which are in the list of devices that has the problem).
     
    _creatio_, Jan 11, 2019
    #3

  4. Tautvydas-Zilys

    Tautvydas-Zilys

    Unity Technologies

    Joined:
    Jul 25, 2013
    Posts:
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    That callstack points to XML serialization. How big are the files you're operating on? Could it be that these files grow more than you have anticipated? Generally, these issues show up randomly when there's a spike in memory usage that gets freed soon after, rather than constant high usage. You could try using Windows Performance Analyzer to see if you have any large spikes in memory usage (here's a guide on how to use it: https://files.unity3d.com/zilys/ETWPerfGuide/data/VirtualAllocCommitProvider.html).

    Do you have access to the specs of the machines these crashes show up? Are they by any chance running 32-bit OS or have low amounts of RAM?
     
    Tautvydas-Zilys, Jan 11, 2019
    #4

  5. _creatio_

    _creatio_

    Joined:
    Mar 21, 2013
    Posts:
    43
    1. Actually we don't use XML in our game assets. At least not directly.
    2. Thank you for the link, I'll check it out.
    3. I have only CPU's they are using:
    Device configuration Count
    Intel Core i3 50
    Intel Core i5 32
    Intel Pentium 10
    Intel Core i7 8

    All of them are running Windows 10, but I was not able to find out if it is 32bit or 64bit.
     
    _creatio_, Jan 11, 2019
    #5

  6. Tautvydas-Zilys

    Tautvydas-Zilys

    Unity Technologies

    Joined:
    Jul 25, 2013
    Posts:
    10,678
    If you're not using XML, it might be worth placing a breakpoint on a function in that callstack and seeing how the code gets there. That might let you identify the problematic area of your code.
     
    Tautvydas-Zilys, Jan 11, 2019
    #6