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Weird "Metal" Crashes - 4.6.2p2

Discussion in 'iOS and tvOS' started by Drowning-Monkeys, Feb 13, 2015.

  1. Drowning-Monkeys

    Drowning-Monkeys

    Joined:
    Mar 6, 2013
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    328
    Hi Guys,

    So I am getting crashes that I've never gotten before, in places that don't cause any kind of NRE's. For example, the game simply hangs on the main menu on an iPhone 6 or iPad Air. On my iPhone 5S and Mini 2, I can get into the game, and then the game crashes when i am running a cutscene, and the game changes cameras between the cutscene camera and the main camera.

    For the former, I don't get any kind of crash. The game just hangs on the main menu with nothing moving, no error of any kind.

    For the latter, this is the error i am getting in Xcode:
    /SourceCache/AppleEmbeddedGPUDrivers/AppleEmbeddedGPUDrivers-50.6.10/AGP/G3/agxa_g3_command_buffer.mm:40: failed assertion `A command encoder is already encoding to this command buffer'

    The "Thread 1 signal SIGBART" error is happening in
    Thred 1 > 6 SetupMetalFBO(unsigned int, ColorRGBAf const&, float, unsigned int)


    Also - important side note, none of this was happening before Metal rendering in 4.6.2p2
     
    Drowning-Monkeys, Feb 13, 2015
    #1

  2. Drowning-Monkeys

    Drowning-Monkeys

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    Case #672232
     
    Drowning-Monkeys, Feb 13, 2015
    #2

  3. MrEsquire

    MrEsquire

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    I'm not sure if Metal is fully stable yet, I have my doubts...maybe not everyone understand it yet.
    I select Automatic settings, does this include metal?
     
    MrEsquire, Feb 14, 2015
    #3

  4. Drowning-Monkeys

    Drowning-Monkeys

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    unfortunately yes. In fact i cannot get it to compile in such a way that it is stable, like 4.6.2p1
     
    Drowning-Monkeys, Feb 14, 2015
    #4

  5. rextr09

    rextr09

    Joined:
    Dec 22, 2011
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    I'm having the same error: NullReference at SetupMetalFBO.
     
    rextr09, Feb 15, 2015
    #5

  6. Alexey

    Alexey

    Unity Technologies

    Joined:
    May 10, 2010
    Posts:
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    >>Case #672232
    sorry, i will not look into 7gbs repro (unless there are no other options at all)
    So, anyone was able to repro it with some actually small project? (or managed to cut down their bigger one to small)
     
    Alexey, Feb 16, 2015
    #6

  7. Drowning-Monkeys

    Drowning-Monkeys

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    @Alexey
    Here's a 500mb repro. Hope it works, i simply exported (including Dependancies) the two scenes in question that need to be tested.

    Case #672842
     
    Drowning-Monkeys, Feb 16, 2015
    #7

  8. Drowning-Monkeys

    Drowning-Monkeys

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    @rextr09 so good news on my end, hopefully this fixes it for you. Don't know why this is but Unity couldn't reproduce my bugs, so when i deleted everything from my phone (the old app), restarted, and reinstalled, everything ran fine.
     
    Drowning-Monkeys, Feb 17, 2015
    #8

  9. Drowning-Monkeys

    Drowning-Monkeys

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    nope, spoke too soon. I still get this error.
     
    Drowning-Monkeys, Feb 18, 2015
    #9

  10. rextr09

    rextr09

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    I found out that "NullReference at SetupMetalFBO" error happens only if Everyplay is imported to the project. Removing Everyplay from the project fixes the problem for me.
     
    Last edited: Mar 1, 2015
    rextr09, Mar 1, 2015
    #10
    MrEsquire likes this.

  11. Alexey

    Alexey

    Unity Technologies

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    oh i totally lost this thread, some updates:
    thanks will look into it
    Can has repro please?
    you also submitted case 672232 which was totally different (as in - thats the issue in backporting metal to 4.x - i missed some codepaths that i believed were not there on 4.x) and will be fixed in next patch release (or smth)

    *edited for some clarification - formatting totally killed it
     
    Alexey, Mar 2, 2015
    #11

  12. rextr09

    rextr09

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    @Alexey, I couldn't produce a small repro yet. I need a little help here. Can you tell me briefly what's happening in the SetupMetalFBO, so that I can focus on things related to that function?
     
    rextr09, Mar 3, 2015
    #12

  13. Alexey

    Alexey

    Unity Technologies

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    well, nothing really: more or less just [MTLCommandBuffer renderCommandEncoderWithDescriptor]
    are you running with debug layer? if so - is it maybe some assert?
     
    Alexey, Mar 4, 2015
    #13

  14. artaka

    artaka

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    @Alexey, It seems I have the same issue. But since I don't have an ARM64 device available at the moment, I cannot reproduce it. But looking at the crash log, it seems "WarmupAllShaders()" may be the cause in my app. Here is the crash log in case it maybe helpful to you.
     

    Attached Files:

    artaka, Mar 5, 2015
    #14

  15. Alexey

    Alexey

    Unity Technologies

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    hm, Awake sounds like really bad place to do stuff. Also for 5.0 we changed first frame handling, but on 4.x you still need to be careful about doing rendering magic on first frame. Can you try splitting your first scene into two? The first one just switching to second on, say, first or second Update?
    EDIT: also i am quite surprised - you mean you have no device that supports metal to test on? you should probably stick to gles-only then (check http://forum.unity3d.com/threads/tw...ction-in-unity-4-6-3-and-upcoming-5-0.299415/ for more info on how to do it)
     
    Alexey, Mar 5, 2015
    #15

  16. rextr09

    rextr09

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    @Alexey, no I'm not running debug.

    @artaka, do you have antialiasing enabled in your game?
     
    rextr09, Mar 5, 2015
    #16

  17. artaka

    artaka

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    @rextr09, no antialiasing is not enabled.
    @Alexey, can you clarify, what is the purpose of splitting the scene into two? What should the first scene do before switching to the second?
     
    Last edited: Mar 5, 2015
    artaka, Mar 5, 2015
    #17

  18. Alexey

    Alexey

    Unity Technologies

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    Well, it is hard to say without proper repro, but what happens (i think) is that you do call WarmupShaders in Awake in first scene - and at this time rendering is not yet set up properly hence the crash. So:
    1. please make small repro and bug report (drop here case number)
    2. Try to do two scenes, first one being just "load actual scene on, say, second update", this way your second scene is guaranteed to be loaded when everything is cool on native side. Yes i agree this is not cool - but some workaround is always cool (and anyway - NEVER do anything like this in Awake)
     
    Alexey, Mar 5, 2015
    #18

  19. artaka

    artaka

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    @Alexey, what I ended up doing is moving WarmupShaders into a simple Coroutine that is triggered in Awake but waits for the next frame before running WarmupShaders. That fixed the crash.
    Thanks for your help.
     
    artaka, Mar 6, 2015
    #19

  20. Wawro01

    Wawro01

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    Guys, please one simple question. How can i detect if unity really uses Metal for rendering on iOS ? Is there some property somewhere ?
     
    Wawro01, Apr 29, 2015
    #20

  21. GameZero

    GameZero

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    Apr 29, 2015
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    We've just encountered this exact same problem; seems fixed in version 4.6.5p2
     
    GameZero, May 20, 2015
    #21

  22. maurogarcia

    maurogarcia

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    Nov 6, 2012
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    Hi, I have same issue in Unity 4.6.4 . Can somebody confirm if it was fixed in 4.6.5??
    Thanks!!
     
    maurogarcia, Nov 26, 2015
    #22

  23. MrEsquire

    MrEsquire

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    You know 4.6.9 is latest version, quiet lot of things have been improved and changed since 4.6.4 days.
     
    MrEsquire, Nov 27, 2015
    #23

  24. maurogarcia

    maurogarcia

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    MrEsquire,
    I just installed the 4.6.9 version and now when I try to build my project I get the following error:
    thanks in advance!
     

    Attached Files:

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    maurogarcia, Nov 30, 2015
    #24

  25. MrEsquire

    MrEsquire

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    Not seen this before, trying googling it. Its almost like install did not go well.
    Did you make a fresh install maybe better and always backup project etc.
     
    MrEsquire, Nov 30, 2015
    #25