[clang] Assertion `Eval.Val.hasValue()' failed.

[yijan4845]

This testcase is generated by a fuzzer.

Compiler Explorer: https://godbolt.org/z/zhK3Eddqs

This valid code will crash on clang assertion trunk:

template<typename T>
struct B {
  [[clang::annotate("test", (9, (void)T{}))]] void t() {}
};
B<int> b;

This goes back to clang-12.

Stack dump:

clang++: /root/llvm-project/clang/lib/Sema/SemaAttr.cpp:540: bool clang::Sema::ConstantFoldAttrArgs(const clang::AttributeCommonInfo&, llvm::MutableArrayRef<clang::Expr*>): Assertion `Eval.Val.hasValue()' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1.	<source>:5:9: current parser token ';'
2.	<source>:2:8: instantiating class definition 'B<int>'
 #0 0x0000000003c04df8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3c04df8)
 #1 0x0000000003c02b04 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3c02b04)
 #2 0x0000000003b50068 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007536fea42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007536fea969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007536fea42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007536fea287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007536fea2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007536fea39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x000000000673c949 clang::Sema::ConstantFoldAttrArgs(clang::AttributeCommonInfo const&, llvm::MutableArrayRef<clang::Expr*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x673c949)
#10 0x00000000066bfad7 clang::Sema::CreateAnnotationAttr(clang::AttributeCommonInfo const&, llvm::StringRef, llvm::MutableArrayRef<clang::Expr*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66bfad7)
#11 0x00000000070db171 clang::Sema::InstantiateAttrs(clang::MultiLevelTemplateArgumentList const&, clang::Decl const*, clang::Decl*, llvm::SmallVector<clang::Sema::LateInstantiatedAttribute, 16u>*, clang::LocalInstantiationScope*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70db171)
#12 0x00000000070dc60c clang::TemplateDeclInstantiator::InitFunctionInstantiation(clang::FunctionDecl*, clang::FunctionDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70dc60c)
#13 0x00000000070dcba8 clang::TemplateDeclInstantiator::InitMethodInstantiation(clang::CXXMethodDecl*, clang::CXXMethodDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70dcba8)
#14 0x00000000070e2905 clang::TemplateDeclInstantiator::VisitCXXMethodDecl(clang::CXXMethodDecl*, clang::TemplateParameterList*, clang::TemplateDeclInstantiator::RewriteKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70e2905)
#15 0x0000000007052e0b clang::Sema::InstantiateClass(clang::SourceLocation, clang::CXXRecordDecl*, clang::CXXRecordDecl*, clang::MultiLevelTemplateArgumentList const&, clang::TemplateSpecializationKind, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7052e0b)
#16 0x000000000707fd58 clang::Sema::InstantiateClassTemplateSpecialization(clang::SourceLocation, clang::ClassTemplateSpecializationDecl*, clang::TemplateSpecializationKind, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x707fd58)
#17 0x00000000070f3f3f void llvm::function_ref<void ()>::callback_fn<clang::Sema::RequireCompleteTypeImpl(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser*)::'lambda'()>(long) SemaType.cpp:0:0
#18 0x0000000007c830f1 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7c830f1)
#19 0x00000000070fd367 clang::Sema::RequireCompleteTypeImpl(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70fd367)
#20 0x00000000070fd6b5 clang::Sema::RequireCompleteType(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70fd6b5)
#21 0x00000000070fd835 clang::Sema::RequireCompleteType(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, unsigned int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70fd835)
#22 0x00000000068d4a11 clang::Sema::ActOnUninitializedDecl(clang::Decl*) (.part.0) SemaDecl.cpp:0:0
#23 0x0000000006576928 clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6576928)
#24 0x0000000006586409 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6586409)
#25 0x00000000065463be clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65463be)
#26 0x0000000006546b79 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6546b79)
#27 0x000000000654e2f3 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x654e2f3)
#28 0x000000000654f1bd clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x654f1bd)
#29 0x00000000065416fa clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65416fa)
#30 0x0000000004587678 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4587678)
#31 0x0000000004842f09 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4842f09)
#32 0x00000000047c2b9e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47c2b9e)
#33 0x000000000492df6e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x492df6e)
#34 0x0000000000cb235f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcb235f)
#35 0x0000000000ca9dfa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#36 0x00000000045cb0d9 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#37 0x0000000003b50514 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b50514)
#38 0x00000000045cb6cf clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#39 0x000000000459115d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x459115d)
#40 0x000000000459224d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x459224d)
#41 0x0000000004599605 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4599605)
#42 0x0000000000caf1a3 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcaf1a3)
#43 0x0000000000b82fe4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xb82fe4)
#44 0x00007536fea29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#45 0x00007536fea29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#46 0x0000000000ca98a5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xca98a5)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Yihan Yang (yijan4845)

**This testcase is generated by a fuzzer.**

Compiler Explorer: https://godbolt.org/z/zhK3Eddqs

This valid code will crash on clang assertion trunk:

template<typename T>
struct B {
  [[clang::annotate("test", (9, (void)T{}))]] void t() {}
};
B<int> b;

This goes back to clang-12.

Stack dump:

clang++: /root/llvm-project/clang/lib/Sema/SemaAttr.cpp:540: bool clang::Sema::ConstantFoldAttrArgs(const clang::AttributeCommonInfo&, llvm::MutableArrayRef<clang::Expr*>): Assertion `Eval.Val.hasValue()' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1.	<source>:5:9: current parser token ';'
2.	<source>:2:8: instantiating class definition 'B<int>'
 #<!-- -->0 0x0000000003c04df8 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3c04df8)
 #<!-- -->1 0x0000000003c02b04 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3c02b04)
 #<!-- -->2 0x0000000003b50068 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x00007536fea42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x00007536fea969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #<!-- -->5 0x00007536fea42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #<!-- -->6 0x00007536fea287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #<!-- -->7 0x00007536fea2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #<!-- -->8 0x00007536fea39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #<!-- -->9 0x000000000673c949 clang::Sema::ConstantFoldAttrArgs(clang::AttributeCommonInfo const&amp;, llvm::MutableArrayRef&lt;clang::Expr*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x673c949)
#<!-- -->10 0x00000000066bfad7 clang::Sema::CreateAnnotationAttr(clang::AttributeCommonInfo const&amp;, llvm::StringRef, llvm::MutableArrayRef&lt;clang::Expr*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66bfad7)
#<!-- -->11 0x00000000070db171 clang::Sema::InstantiateAttrs(clang::MultiLevelTemplateArgumentList const&amp;, clang::Decl const*, clang::Decl*, llvm::SmallVector&lt;clang::Sema::LateInstantiatedAttribute, 16u&gt;*, clang::LocalInstantiationScope*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70db171)
#<!-- -->12 0x00000000070dc60c clang::TemplateDeclInstantiator::InitFunctionInstantiation(clang::FunctionDecl*, clang::FunctionDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70dc60c)
#<!-- -->13 0x00000000070dcba8 clang::TemplateDeclInstantiator::InitMethodInstantiation(clang::CXXMethodDecl*, clang::CXXMethodDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70dcba8)
#<!-- -->14 0x00000000070e2905 clang::TemplateDeclInstantiator::VisitCXXMethodDecl(clang::CXXMethodDecl*, clang::TemplateParameterList*, clang::TemplateDeclInstantiator::RewriteKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70e2905)
#<!-- -->15 0x0000000007052e0b clang::Sema::InstantiateClass(clang::SourceLocation, clang::CXXRecordDecl*, clang::CXXRecordDecl*, clang::MultiLevelTemplateArgumentList const&amp;, clang::TemplateSpecializationKind, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7052e0b)
#<!-- -->16 0x000000000707fd58 clang::Sema::InstantiateClassTemplateSpecialization(clang::SourceLocation, clang::ClassTemplateSpecializationDecl*, clang::TemplateSpecializationKind, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x707fd58)
#<!-- -->17 0x00000000070f3f3f void llvm::function_ref&lt;void ()&gt;::callback_fn&lt;clang::Sema::RequireCompleteTypeImpl(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser*)::'lambda'()&gt;(long) SemaType.cpp:0:0
#<!-- -->18 0x0000000007c830f1 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7c830f1)
#<!-- -->19 0x00000000070fd367 clang::Sema::RequireCompleteTypeImpl(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70fd367)
#<!-- -->20 0x00000000070fd6b5 clang::Sema::RequireCompleteType(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70fd6b5)
#<!-- -->21 0x00000000070fd835 clang::Sema::RequireCompleteType(clang::SourceLocation, clang::QualType, clang::Sema::CompleteTypeKind, unsigned int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70fd835)
#<!-- -->22 0x00000000068d4a11 clang::Sema::ActOnUninitializedDecl(clang::Decl*) (.part.0) SemaDecl.cpp:0:0
#<!-- -->23 0x0000000006576928 clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6576928)
#<!-- -->24 0x0000000006586409 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&amp;, clang::DeclaratorContext, clang::ParsedAttributes&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6586409)
#<!-- -->25 0x00000000065463be clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec&amp;, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65463be)
#<!-- -->26 0x0000000006546b79 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6546b79)
#<!-- -->27 0x000000000654e2f3 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x654e2f3)
#<!-- -->28 0x000000000654f1bd clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x654f1bd)
#<!-- -->29 0x00000000065416fa clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65416fa)
#<!-- -->30 0x0000000004587678 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4587678)
#<!-- -->31 0x0000000004842f09 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4842f09)
#<!-- -->32 0x00000000047c2b9e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47c2b9e)
#<!-- -->33 0x000000000492df6e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x492df6e)
#<!-- -->34 0x0000000000cb235f cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcb235f)
#<!-- -->35 0x0000000000ca9dfa ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->36 0x00000000045cb0d9 void llvm::function_ref&lt;void ()&gt;::callback_fn&lt;clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const::'lambda'()&gt;(long) Job.cpp:0:0
#<!-- -->37 0x0000000003b50514 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b50514)
#<!-- -->38 0x00000000045cb6cf clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const (.part.0) Job.cpp:0:0
#<!-- -->39 0x000000000459115d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x459115d)
#<!-- -->40 0x000000000459224d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x459224d)
#<!-- -->41 0x0000000004599605 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4599605)
#<!-- -->42 0x0000000000caf1a3 clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcaf1a3)
#<!-- -->43 0x0000000000b82fe4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xb82fe4)
#<!-- -->44 0x00007536fea29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->45 0x00007536fea29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->46 0x0000000000ca98a5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xca98a5)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

[tbaederr]

This is #105789

[AaronBallman]

Oops, that's a PR, not an open issue. :-)

[shafik]

@yijan4845 I am not sure how to reach out to you but I was wondering do you have any papers on your fuzzing approach? It seems to do a decent job of finding regressions. It would be great to know what is different about your approach that helps it find recent regressions so well.

[yijan4845]

@yijan4845 I am not sure how to reach out to you but I was wondering do you have any papers on your fuzzing approach? It seems to do a decent job of finding regressions. It would be great to know what is different about your approach that helps it find recent regressions so well.

We are designing and synthesizing mutators specifically tailored for LLVM, utilizing programs extracted from unit tests as seed inputs. We will release our paper and code soon. Stay in touch!