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Votes

3

Found in

2017.4

2018.3.8f1

2018.4

2019.1

2019.2

2019.3

Issue ID

1160085

Regression

No

[Android] Crash (SIGBUS) occurs when reading the area where 4 bytes are not aligned with il2cpp release, but not debug

IL2CPP

-

To reproduce:
1. Download and open the attached project
2. Build and run to the device

Actual result: application crashes
Expected result: the application should not crash

Reproduced with: 2017.4.29f1;2018.4.3f1; 2019.1.7f1; 2019.2.0b6; 2019.3.0a6

Tested with:
VLNQA00123, Google Pixel 2 XL (Pixel 2 XL), Android 9, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00266, Xiaomi Mi A2 (Mi A2), Android 8.1.0, CPU: Snapdragon 660, GPU: Adreno (TM) 512
VLNQA00009, Samsung Galaxy Note8 (SM-N950F), Android 8.0.0, CPU: Exynos 9 Octa 8895, GPU: Mali-G71

Note: not sure if this is duplicate of https://fogbugz.unity3d.com/f/cases/1078189/
Note: This problem is caused by a process in an algorithm called FarmHash published by Google.
Of the five pieces of Fetch32 in the code, it has been confirmed that three are similarly converted to "LDM".
https://github.com/google/farmhash/blob/master/src/farmhash.cc#L1102-L1104
https://github.com/neuecc/MessagePack-CSharp/blob/master/src/MessagePack/Internal/FarmHash.cs#L163-L165

  1. Resolution Note:

    This is unsafe C# code which is reading unaligned memory on ARM, which is not allowed.

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Comments (2)

  1. soorya696

    Dec 10, 2019 08:17

    I'm too facing this issue. Any update on this?
    I'm using unity 2019.3.01f

  2. vfilho

    Dec 04, 2019 18:40

    How is the progress of this solution? I'm facing this issue and I don't have any clue how fix this problem, please give us some feedback.

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