Vulkan conformance test gets access violation in spvValidate

[TonyBarbour]

Specifics
Windows 7, Nvidia GTX 660 Ti, Driver 368.39

Have Vulkan SDK 1.0.21 installed for validation layers and set environment variable VK_INSTANCE_LAYERS=VK_LAYER_LUNARG_standard_validation

To reproduce I run all of the dEQP-VK.glsl.functions.control_flow.* tests from the Vulkan Conformance Test Suite

Message:
Exception thrown: read access violation.
this was nullptr. (debugger confirms that variable "this" is NULL)

Location:
BasicBlock.h:

76 /// Returns true if the block is reachable in the CFG
77 bool reachable() const { return reachable_; }

Call Stack:
`
VkLayer_core_validation.dll!libspirv::BasicBlock::reachable() Line 77 C++

VkLayer_core_validation.dll!libspirv::StructuredControlFlowChecks(const libspirv::ValidationState_t & _, const libspirv::Function & function, const std::vector<std::pair<unsigned int,unsigned int>,std::allocator<std::pair<unsigned int,unsigned int> > > & back_edges) Line 349 C++

VkLayer_core_validation.dll!libspirv::PerformCfgChecks(libspirv::ValidationState_t & _) Line 478    C++

VkLayer_core_validation.dll!spvValidate(const spv_context_t * const context, spv_const_binary_t * const binary, spv_diagnostic_t * * pDiagnostic) Line 209  C++

VkLayer_core_validation.dll!core_validation::CreateShaderModule(VkDevice_T * device, const VkShaderModuleCreateInfo * pCreateInfo, const VkAllocationCallbacks * pAllocator, VkShaderModule_T * * pShaderModule) Line 9069  C++

VkLayer_object_tracker.dll!object_tracker::CreateShaderModule(VkDevice_T * device, const VkShaderModuleCreateInfo * pCreateInfo, const VkAllocationCallbacks * pAllocator, VkShaderModule_T * * pShaderModule) Line 3583    C++

VkLayer_parameter_validation.dll!parameter_validation::CreateShaderModule(VkDevice_T * device, const VkShaderModuleCreateInfo * pCreateInfo, const VkAllocationCallbacks * pAllocator, VkShaderModule_T * * pShaderModule) Line 2621    C++

VkLayer_threading.dll!threading::CreateShaderModule(VkDevice_T * device, const VkShaderModuleCreateInfo * pCreateInfo, const VkAllocationCallbacks * pAllocator, VkShaderModule_T * * pShaderModule) Line 1133  C++

deqp-vk.exe!vk::DeviceDriver::createShaderModule(vk::VkDevice_s * device, const vk::VkShaderModuleCreateInfo * pCreateInfo, const vk::VkAllocationCallbacks * pAllocator, vk::Handle<14> * pShaderModule) Line 218  C++

deqp-vk.exe!vk::createShaderModule(const vk::DeviceInterface & vk, vk::VkDevice_s * device, const vk::VkShaderModuleCreateInfo * pCreateInfo, const vk::VkAllocationCallbacks * pAllocator) Line 209    C++

deqp-vk.exe!vk::createShaderModule(const vk::DeviceInterface & deviceInterface, vk::VkDevice_s * device, const vk::ProgramBinary & binary, unsigned int flags) Line 206 C++
deqp-vk.exe!vkt::`anonymous namespace'::PipelineProgram::PipelineProgram(vkt::Context & context, const glu::sl::ShaderCaseSpecification & spec) Line 745    C++

deqp-vk.exe!vkt::`anonymous namespace'::ShaderCaseInstance::ShaderCaseInstance(vkt::Context & context, const glu::sl::ShaderCaseSpecification & spec) Line 1410 C++

deqp-vk.exe!vkt::`anonymous namespace'::ShaderCase::createInstance(vkt::Context & context) Line 1791    C++

deqp-vk.exe!vkt::TestCaseExecutor::init(tcu::TestCase * testCase, const std::basic_string<char,std::char_traits<char>,std::allocator<char> > & casePath) Line 246   C++

deqp-vk.exe!tcu::TestSessionExecutor::enterTestCase(tcu::TestCase * testCase, const std::basic_string<char,std::char_traits<char>,std::allocator<char> > & casePath) Line 181   C++

deqp-vk.exe!tcu::TestSessionExecutor::iterate() Line 101    C++

deqp-vk.exe!tcu::App::iterate() Line 172    C++

deqp-vk.exe!main(int argc, const char * * argv) Line 55 C++
[External Code] 

`

Bisected to spirv-tools commit: f61db0bcc6717b4b60a7e38e7c3c58ad02110aa8
Validator structured flow checks: back-edge, constructs

[antiagainst]

This is actually an issue for SPIRV-Tools. So migrate it there for better tracking: KhronosGroup/SPIRV-Tools#270.

Closing this one.