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Third Party Issue
Votes
0
Found in
2021.3.45f1
2022.3.52f1
6000.0.26f1
6000.1.0a3
Issue ID
UUM-86995
Regression
No
Crash when trying to force Shader to interpret 1/30 as a floating point operation
Reproduction steps:
1. Open the attached “BugRepro” project
2. Wait for shaders to compile
Expected result: Shader compiles successfully
Actual result: Machine blacks out and crashes
Reproducible with: 2021.3.45f1, 2022.3.52f1, 6000.0.26f1, 6000.1.0a3
Reproducible on: Ubuntu 24.04, Windows 10, Arch (user)
Not reproducible on: No other environment tested
First lines of the stack trace:
{{#4 0x00755e4e755110 in amdgpu_winsys_create}}
{{#5 0x00755e4e757bf6 in amdgpu_winsys_create}}
{{#6 0x00755e4defcb81 in __driDriverGetExtensions_d3d12}}
{{#7 0x00755e4df1d6fc in __driDriverGetExtensions_d3d12}}
{{#4 0x007bf9e17b0083 in amdgpu_winsys_create}}
{{#5 0x007bf9e17b3573 in amdgpu_winsys_create}}
{{#6 0x007bf9e0eab854 in vdp_imp_device_create_x11}}
{{#7 0x007bf9e0ecec9d in vdp_imp_device_create_x11}}
{{#8 0x007bfa131e539d in pthread_condattr_setpshared}}
-
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Resolution Note:
1/30 is rightfully interpreted as 0. Both constants are integers, and integer division of 1 by 30 gives a zero.
The shader uses this constant after converting to float as a divisor:
int sampleCount = (0.01111/float(1/30))*32;
The floating point result of this operation is NaN, which is then converted to int. I'm pretty sure the driver doesn't like using this as a loop counter.
In order to fix this, `1.0/30.0` should be used instead.