WebGL builds started failing

[liortal]

We had a few successful builds for WebGL but suddenly these are not working anymore. The builds fail with this error:

Shader compiler: exception while compiling shader snippet. Thread=-1614216256 Type=0 platform=5. Source:
168934: [Unity] #line 66 “”
168935: [Unity] #ifdef DUMMY_PREPROCESSOR_TO_WORK_AROUND_HLSL_COMPILER_LINE_HANDLING
168936: [Unity] #endif
168937: [Unity] #include “HLSLSupport.cginc”
168938: [Unity] #include “UnityShaderVariables.cginc”
168939: [Unity] #line 49
168940: [Unity] #define UNITY_SETUP_BRDF_INPUT MetallicSetup
168941: [Unity] #line 66 “”
168942: [Unity] #ifdef DUMMY_PREPROCESSOR_TO_WORK_AROUND_HLSL_COMPILER_LINE_HANDLING
168943: [Unity] #endif
168944: [Unity] /* UNITY: Original start of shader */
168945: [Unity] #pragma target 3.0
168946: [Unity] #pragma shader_feature _NORMALMAP
168947: [Unity] #pragma shader_feature _ _ALPHATEST_ON _ALPHABLEND_ON _ALPHAPREMULTIPLY_ON
168948: [Unity] #pragma shader_feature _EMISSION
168949: [Unity] #pragma shader_feature _METALLICGLOSSMAP
168950: [Unity] #pragma shader_feature ___ _DETAIL_MULX2
168951: [Unity] #pragma shader_feature _ _SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A
168952: [Unity] #pragma shader_feature _ _SPECULARHIGHLIGHTS_OFF
168953: [Unity] #pragma shader_feature _ _GLOSSYREFLECTIONS_OFF
168954: [Unity] #pragma shader_feature _PARALLAXMAP
168955: [Unity] #pragma multi_compile_fwdbase
168956: [Unity] #pragma multi_compile_fog
168957: [Unity] #pragma vertex vertBase
168958: [Unity] #pragma fragment fragBase
168959: [Unity] #include “UnityStandardCoreForward.cginc”
168960: [Unity] Shader compiler: internal error compiling shader snippet type=0 platform=5: Protocol error - failed to read correct magic number

Is this an issue with UCB or something to do with our project ?

[liortal]

Also, it appears that the last successful build has the same SHA1 as the one that’s failing now:

Which means that we haven’t changed our project since the last successful build (so - this looks like a UCB issue ?)