Crash on launch on Android after upgrading from UE 5.6 to UE 5.7

Development Platform & Builds Mobile
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Hello!

We recently started looking into finally upgrading our mobile project from 5.6 to 5.7.

When trying to launch a build packaged with 5.7.3 (and 5.7.2) on any of our Android testing devices our game immediately crashes.

We’ve spent a fair bit of time trying to narrow down what the issue might be and so far we’ve found that the crash only happens with the deferred mobile renderer enabled. If we switch to the forward renderer (setting r.Mobile.ShadingPath=0 in Config/DefaultEngine.ini) the crash goes away. We would ideally like to keep using the deferred renderer though.

This is the interesting part of the log:

[2026.02.13-12.52.12:350][ 0]LogMaterial: Warning: Incomplete material DefaultLightFunctionMaterial, missing FMaterialShader (FMobileDirectionalLightFunctionPS, 16).
[2026.02.13-12.52.12:350][ 0]LogMaterial: Warning: Incomplete material DefaultLightFunctionMaterial, missing FMaterialShader (FMobileDirectionalLightFunctionPS, 16).
[2026.02.13-12.52.12:362][ 0]LogAndroid: Error: === Critical error: ===
[2026.02.13-12.52.12:362][ 0]LogAndroid: Error:
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: Fatal error: [File:./Runtime/Engine/Private/Materials/MaterialShared.cpp] [Line: 3006]
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: Failed to find shader map for default material DefaultLightFunctionMaterial(/Engine/EngineMaterials/DefaultLightFunctionMaterial.DefaultLightFunctionMaterial)! Please make sure cooking was successful (Contains inline shaders, has GTSM)
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B4AF4CD98 libUnreal.so(0x0000000007911D98)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B4AF4CA38 libUnreal.so(0x0000000007911A38)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B4AEDDF1C libUnreal.so(0x00000000078A2F1C)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B4AEDF6F8 libUnreal.so(0x00000000078A46F8)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B467B9C34 libUnreal.so(0x000000000317EC34)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B46991F84 libUnreal.so(0x0000000003356F84)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B4697DA34 libUnreal.so(0x0000000003342A34)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B4697EBD8 libUnreal.so(0x0000000003343BD8)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B46993C18 libUnreal.so(0x0000000003358C18)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B46997E98 libUnreal.so(0x000000000335CE98)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B469A0418 libUnreal.so(0x0000000003365418)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B46629D94 libUnreal.so(0x0000000002FEED94)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B46629AEC libUnreal.so(0x0000000002FEEAEC)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D84DC libUnreal.so(0x000000000329D4DC)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D9E58 libUnreal.so(0x000000000329EE58)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D6F14 libUnreal.so(0x000000000329BF14)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D4F3C libUnreal.so(0x0000000003299F3C)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D7500 libUnreal.so(0x000000000329C500)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B468B32A4 libUnreal.so(0x00000000032782A4)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B4AED8E88 libUnreal.so(0x000000000789DE88)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B4AF01424 libUnreal.so(0x00000000078C6424)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B4AEDAFB4 libUnreal.so(0x000000000789FFB4)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B468DB988 libUnreal.so(0x00000000032A0988)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B4698BB40 libUnreal.so(0x0000000003350B40)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B4698A4F8 libUnreal.so(0x000000000334F4F8)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B4697DA34 libUnreal.so(0x0000000003342A34)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B4697EBD8 libUnreal.so(0x0000000003343BD8)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B46993C18 libUnreal.so(0x0000000003358C18)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B46997E98 libUnreal.so(0x000000000335CE98)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B469A0418 libUnreal.so(0x0000000003365418)Unknown
[2026.02.13-12.52.12:363][ 0]LogAndroid: Error: [Callstack] 0x0000007B46629D94 libUnreal.so(0x0000000002FEED94)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B46629AEC libUnreal.so(0x0000000002FEEAEC)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D84DC libUnreal.so(0x000000000329D4DC)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D9E58 libUnreal.so(0x000000000329EE58)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D6F14 libUnreal.so(0x000000000329BF14)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D4F3C libUnreal.so(0x0000000003299F3C)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D7500 libUnreal.so(0x000000000329C500)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B468B32A4 libUnreal.so(0x00000000032782A4)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B4AED8E88 libUnreal.so(0x000000000789DE88)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B4AF01424 libUnreal.so(0x00000000078C6424)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B4AEDAFB4 libUnreal.so(0x000000000789FFB4)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B468DB988 libUnreal.so(0x00000000032A0988)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B4698BB40 libUnreal.so(0x0000000003350B40)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B4698A4F8 libUnreal.so(0x000000000334F4F8)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B4697DA34 libUnreal.so(0x0000000003342A34)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B4697EBD8 libUnreal.so(0x0000000003343BD8)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B46993C18 libUnreal.so(0x0000000003358C18)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B46997E98 libUnreal.so(0x000000000335CE98)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B469A0418 libUnreal.so(0x0000000003365418)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B46629D94 libUnreal.so(0x0000000002FEED94)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B46629AEC libUnreal.so(0x0000000002FEEAEC)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D84DC libUnreal.so(0x000000000329D4DC)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D9E58 libUnreal.so(0x000000000329EE58)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D6F14 libUnreal.so(0x000000000329BF14)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D4F3C libUnreal.so(0x0000000003299F3C)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B468D7500 libUnreal.so(0x000000000329C500)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B468B32A4 libUnreal.so(0x00000000032782A4)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B4AED8E88 libUnreal.so(0x000000000789DE88)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B4AED96D0 libUnreal.so(0x000000000789E6D0)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B46672450 libUnreal.so(0x0000000003037450)Unknown
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error: [Callstack] 0x0000007B4AED9
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error:
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error:
[2026.02.13-12.52.12:364][ 0]LogAndroid: Error:
[2026.02.13-12.52.12:367][ 0]LogExit: Executing StaticShutdownAfterError
[2026.02.13-12.52.12:367][ 0]LogAndroid: FAndroidMisc::RequestExit(1, FAndroidErrorOutputDevice::Serialize.!GIsGuarded)

Some other findings and things we’ve tried:

  • Not reproducable in a minimal test project
  • Vulkan-only still has the issue
  • Forcing cook of /Engine/EngineMaterials does not help
  • Creating & cooking a map with a Light Function material does not help
  • As far as I can tell shader dumps do not contain FMobileDirectionalLightFunctionPS

Any ideas what this might be about? Anyone else that’s run in to this?