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[clang] Assertion `E != nullptr' failed. crashed at clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) #115004

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yijan4845 opened this issue Nov 5, 2024 · 2 comments
Open

[clang] Assertion `E != nullptr' failed. crashed at clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) #115004

yijan4845 opened this issue Nov 5, 2024 · 2 comments
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c++20 clang:frontend:fuzzer clang:frontend Language frontend issues, e.g. anything involving "Sema" crash-on-invalid regression

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@yijan4845
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This testcase is generated by a fuzzer.

Compiler Explorer: https://godbolt.org/z/P1xE1dEx1

This invalid code will crash on Clang Assertion Trunk.

template <typename d> concept g = 0;
template <g> struct h;
template <g d>
struct h<d>;

This won't crash in clang-19.

Stack dump:

clang++: /root/llvm-project/clang/lib/Sema/SemaConcept.cpp:1584: static std::optional<clang::NormalizedConstraint> clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, const clang::Expr*): Assertion `E != nullptr' 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 -std=c++20 <source>
1.	<source>:4:12: current parser token ';'
 #0 0x0000000003be9e28 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3be9e28)
 #1 0x0000000003be7b2c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3be7b2c)
 #2 0x0000000003b35468 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007759bfe42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007759bfe969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007759bfe42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007759bfe287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007759bfe2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007759bfe39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x00000000069e2ad0 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e2ad0)
#10 0x00000000069e2b63 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&, clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e2b63)
#11 0x00000000069e1f79 clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e1f79)
#12 0x00000000069e25e3 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e25e3)
#13 0x00000000069e2b63 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&, clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e2b63)
#14 0x00000000069e1f79 clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef<clang::Expr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e1f79)
#15 0x00000000069f4a74 clang::Sema::IsAtLeastAsConstrained(clang::NamedDecl*, llvm::MutableArrayRef<clang::Expr const*>, clang::NamedDecl*, llvm::MutableArrayRef<clang::Expr const*>, bool&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69f4a74)
#16 0x000000000732de19 clang::ClassTemplatePartialSpecializationDecl* getMoreSpecialized<clang::ClassTemplatePartialSpecializationDecl, clang::ClassTemplateDecl>(clang::Sema&, clang::QualType, clang::QualType, clang::ClassTemplatePartialSpecializationDecl*, clang::ClassTemplateDecl*, clang::sema::TemplateDeductionInfo&) SemaTemplateDeduction.cpp:0:0
#17 0x000000000732e009 clang::Sema::isMoreSpecializedThanPrimary(clang::ClassTemplatePartialSpecializationDecl*, clang::sema::TemplateDeductionInfo&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x732e009)
#18 0x00000000072516a4 void checkTemplatePartialSpecialization<clang::ClassTemplatePartialSpecializationDecl>(clang::Sema&, clang::ClassTemplatePartialSpecializationDecl*) SemaTemplate.cpp:0:0
#19 0x00000000072e9039 clang::Sema::ActOnClassTemplateSpecialization(clang::Scope*, unsigned int, clang::TagUseKind, clang::SourceLocation, clang::SourceLocation, clang::CXXScopeSpec&, clang::TemplateIdAnnotation&, clang::ParsedAttributesView const&, llvm::MutableArrayRef<clang::TemplateParameterList*>, clang::SkipBodyInfo*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x72e9039)
#20 0x0000000006755fb3 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6755fb3)
#21 0x000000000672bb70 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x672bb70)
#22 0x00000000067f361a clang::Parser::ParseDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo&, clang::ParsingDeclRAIIObject&, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67f361a)
#23 0x0000000006800f3c clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (.part.0) ParseTemplate.cpp:0:0
#24 0x000000000680125a clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x680125a)
#25 0x0000000006732863 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6732863)
#26 0x00000000066f1897 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f1897)
#27 0x00000000066f273d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f273d)
#28 0x00000000066e4c5a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e4c5a)
#29 0x0000000004563b58 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4563b58)
#30 0x000000000481e689 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x481e689)
#31 0x000000000479d8fe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x479d8fe)
#32 0x000000000490441e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x490441e)
#33 0x0000000000ce624f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce624f)
#34 0x0000000000cddf0a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#35 0x00000000045a6cb9 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
#36 0x0000000003b35914 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b35914)
#37 0x00000000045a72af 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
#38 0x000000000456d63d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x456d63d)
#39 0x000000000456e72d 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+++0x456e72d)
#40 0x0000000004575ae5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4575ae5)
#41 0x0000000000ce30e9 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce30e9)
#42 0x0000000000bb0284 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbb0284)
#43 0x00007759bfe29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#44 0x00007759bfe29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#45 0x0000000000cdd9be _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdd9be)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
@yijan4845 yijan4845 added c++20 clang:frontend Language frontend issues, e.g. anything involving "Sema" regression crash-on-invalid clang:frontend:fuzzer labels Nov 5, 2024
@llvmbot
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llvmbot commented Nov 5, 2024

@llvm/issue-subscribers-clang-frontend

Author: Yihan Yang (yijan4845)

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

Compiler Explorer: https://godbolt.org/z/P1xE1dEx1

This invalid code will crash on Clang Assertion Trunk.

template &lt;typename d&gt; concept g = 0;
template &lt;g&gt; struct h;
template &lt;g d&gt;
struct h&lt;d&gt;;

This won't crash in clang-19.

Stack dump:

clang++: /root/llvm-project/clang/lib/Sema/SemaConcept.cpp:1584: static std::optional&lt;clang::NormalizedConstraint&gt; clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&amp;, clang::NamedDecl*, const clang::Expr*): Assertion `E != nullptr' 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 -std=c++20 &lt;source&gt;
1.	&lt;source&gt;:4:12: current parser token ';'
 #<!-- -->0 0x0000000003be9e28 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3be9e28)
 #<!-- -->1 0x0000000003be7b2c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3be7b2c)
 #<!-- -->2 0x0000000003b35468 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x00007759bfe42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x00007759bfe969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #<!-- -->5 0x00007759bfe42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #<!-- -->6 0x00007759bfe287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #<!-- -->7 0x00007759bfe2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #<!-- -->8 0x00007759bfe39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #<!-- -->9 0x00000000069e2ad0 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&amp;, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e2ad0)
#<!-- -->10 0x00000000069e2b63 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&amp;, clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e2b63)
#<!-- -->11 0x00000000069e1f79 clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e1f79)
#<!-- -->12 0x00000000069e25e3 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&amp;, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e25e3)
#<!-- -->13 0x00000000069e2b63 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&amp;, clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e2b63)
#<!-- -->14 0x00000000069e1f79 clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e1f79)
#<!-- -->15 0x00000000069f4a74 clang::Sema::IsAtLeastAsConstrained(clang::NamedDecl*, llvm::MutableArrayRef&lt;clang::Expr const*&gt;, clang::NamedDecl*, llvm::MutableArrayRef&lt;clang::Expr const*&gt;, bool&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69f4a74)
#<!-- -->16 0x000000000732de19 clang::ClassTemplatePartialSpecializationDecl* getMoreSpecialized&lt;clang::ClassTemplatePartialSpecializationDecl, clang::ClassTemplateDecl&gt;(clang::Sema&amp;, clang::QualType, clang::QualType, clang::ClassTemplatePartialSpecializationDecl*, clang::ClassTemplateDecl*, clang::sema::TemplateDeductionInfo&amp;) SemaTemplateDeduction.cpp:0:0
#<!-- -->17 0x000000000732e009 clang::Sema::isMoreSpecializedThanPrimary(clang::ClassTemplatePartialSpecializationDecl*, clang::sema::TemplateDeductionInfo&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x732e009)
#<!-- -->18 0x00000000072516a4 void checkTemplatePartialSpecialization&lt;clang::ClassTemplatePartialSpecializationDecl&gt;(clang::Sema&amp;, clang::ClassTemplatePartialSpecializationDecl*) SemaTemplate.cpp:0:0
#<!-- -->19 0x00000000072e9039 clang::Sema::ActOnClassTemplateSpecialization(clang::Scope*, unsigned int, clang::TagUseKind, clang::SourceLocation, clang::SourceLocation, clang::CXXScopeSpec&amp;, clang::TemplateIdAnnotation&amp;, clang::ParsedAttributesView const&amp;, llvm::MutableArrayRef&lt;clang::TemplateParameterList*&gt;, clang::SkipBodyInfo*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x72e9039)
#<!-- -->20 0x0000000006755fb3 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6755fb3)
#<!-- -->21 0x000000000672bb70 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x672bb70)
#<!-- -->22 0x00000000067f361a clang::Parser::ParseDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo&amp;, clang::ParsingDeclRAIIObject&amp;, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67f361a)
#<!-- -->23 0x0000000006800f3c clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::AccessSpecifier) (.part.0) ParseTemplate.cpp:0:0
#<!-- -->24 0x000000000680125a clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x680125a)
#<!-- -->25 0x0000000006732863 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6732863)
#<!-- -->26 0x00000000066f1897 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f1897)
#<!-- -->27 0x00000000066f273d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f273d)
#<!-- -->28 0x00000000066e4c5a clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e4c5a)
#<!-- -->29 0x0000000004563b58 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4563b58)
#<!-- -->30 0x000000000481e689 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x481e689)
#<!-- -->31 0x000000000479d8fe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x479d8fe)
#<!-- -->32 0x000000000490441e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x490441e)
#<!-- -->33 0x0000000000ce624f cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce624f)
#<!-- -->34 0x0000000000cddf0a ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->35 0x00000000045a6cb9 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
#<!-- -->36 0x0000000003b35914 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b35914)
#<!-- -->37 0x00000000045a72af 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
#<!-- -->38 0x000000000456d63d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x456d63d)
#<!-- -->39 0x000000000456e72d 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+++0x456e72d)
#<!-- -->40 0x0000000004575ae5 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+++0x4575ae5)
#<!-- -->41 0x0000000000ce30e9 clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce30e9)
#<!-- -->42 0x0000000000bb0284 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbb0284)
#<!-- -->43 0x00007759bfe29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->44 0x00007759bfe29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->45 0x0000000000cdd9be _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdd9be)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

@llvmbot
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llvmbot commented Nov 5, 2024

@llvm/issue-subscribers-c-20

Author: Yihan Yang (yijan4845)

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

Compiler Explorer: https://godbolt.org/z/P1xE1dEx1

This invalid code will crash on Clang Assertion Trunk.

template &lt;typename d&gt; concept g = 0;
template &lt;g&gt; struct h;
template &lt;g d&gt;
struct h&lt;d&gt;;

This won't crash in clang-19.

Stack dump:

clang++: /root/llvm-project/clang/lib/Sema/SemaConcept.cpp:1584: static std::optional&lt;clang::NormalizedConstraint&gt; clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&amp;, clang::NamedDecl*, const clang::Expr*): Assertion `E != nullptr' 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 -std=c++20 &lt;source&gt;
1.	&lt;source&gt;:4:12: current parser token ';'
 #<!-- -->0 0x0000000003be9e28 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3be9e28)
 #<!-- -->1 0x0000000003be7b2c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3be7b2c)
 #<!-- -->2 0x0000000003b35468 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x00007759bfe42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x00007759bfe969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #<!-- -->5 0x00007759bfe42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #<!-- -->6 0x00007759bfe287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #<!-- -->7 0x00007759bfe2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #<!-- -->8 0x00007759bfe39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #<!-- -->9 0x00000000069e2ad0 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&amp;, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e2ad0)
#<!-- -->10 0x00000000069e2b63 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&amp;, clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e2b63)
#<!-- -->11 0x00000000069e1f79 clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e1f79)
#<!-- -->12 0x00000000069e25e3 clang::NormalizedConstraint::fromConstraintExpr(clang::Sema&amp;, clang::NamedDecl*, clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e25e3)
#<!-- -->13 0x00000000069e2b63 clang::NormalizedConstraint::fromConstraintExprs(clang::Sema&amp;, clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e2b63)
#<!-- -->14 0x00000000069e1f79 clang::Sema::getNormalizedAssociatedConstraints(clang::NamedDecl*, llvm::ArrayRef&lt;clang::Expr const*&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69e1f79)
#<!-- -->15 0x00000000069f4a74 clang::Sema::IsAtLeastAsConstrained(clang::NamedDecl*, llvm::MutableArrayRef&lt;clang::Expr const*&gt;, clang::NamedDecl*, llvm::MutableArrayRef&lt;clang::Expr const*&gt;, bool&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69f4a74)
#<!-- -->16 0x000000000732de19 clang::ClassTemplatePartialSpecializationDecl* getMoreSpecialized&lt;clang::ClassTemplatePartialSpecializationDecl, clang::ClassTemplateDecl&gt;(clang::Sema&amp;, clang::QualType, clang::QualType, clang::ClassTemplatePartialSpecializationDecl*, clang::ClassTemplateDecl*, clang::sema::TemplateDeductionInfo&amp;) SemaTemplateDeduction.cpp:0:0
#<!-- -->17 0x000000000732e009 clang::Sema::isMoreSpecializedThanPrimary(clang::ClassTemplatePartialSpecializationDecl*, clang::sema::TemplateDeductionInfo&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x732e009)
#<!-- -->18 0x00000000072516a4 void checkTemplatePartialSpecialization&lt;clang::ClassTemplatePartialSpecializationDecl&gt;(clang::Sema&amp;, clang::ClassTemplatePartialSpecializationDecl*) SemaTemplate.cpp:0:0
#<!-- -->19 0x00000000072e9039 clang::Sema::ActOnClassTemplateSpecialization(clang::Scope*, unsigned int, clang::TagUseKind, clang::SourceLocation, clang::SourceLocation, clang::CXXScopeSpec&amp;, clang::TemplateIdAnnotation&amp;, clang::ParsedAttributesView const&amp;, llvm::MutableArrayRef&lt;clang::TemplateParameterList*&gt;, clang::SkipBodyInfo*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x72e9039)
#<!-- -->20 0x0000000006755fb3 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6755fb3)
#<!-- -->21 0x000000000672bb70 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x672bb70)
#<!-- -->22 0x00000000067f361a clang::Parser::ParseDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo&amp;, clang::ParsingDeclRAIIObject&amp;, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67f361a)
#<!-- -->23 0x0000000006800f3c clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::AccessSpecifier) (.part.0) ParseTemplate.cpp:0:0
#<!-- -->24 0x000000000680125a clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x680125a)
#<!-- -->25 0x0000000006732863 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6732863)
#<!-- -->26 0x00000000066f1897 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f1897)
#<!-- -->27 0x00000000066f273d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f273d)
#<!-- -->28 0x00000000066e4c5a clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e4c5a)
#<!-- -->29 0x0000000004563b58 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4563b58)
#<!-- -->30 0x000000000481e689 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x481e689)
#<!-- -->31 0x000000000479d8fe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x479d8fe)
#<!-- -->32 0x000000000490441e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x490441e)
#<!-- -->33 0x0000000000ce624f cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce624f)
#<!-- -->34 0x0000000000cddf0a ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->35 0x00000000045a6cb9 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
#<!-- -->36 0x0000000003b35914 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b35914)
#<!-- -->37 0x00000000045a72af 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
#<!-- -->38 0x000000000456d63d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x456d63d)
#<!-- -->39 0x000000000456e72d 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+++0x456e72d)
#<!-- -->40 0x0000000004575ae5 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+++0x4575ae5)
#<!-- -->41 0x0000000000ce30e9 clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce30e9)
#<!-- -->42 0x0000000000bb0284 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbb0284)
#<!-- -->43 0x00007759bfe29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->44 0x00007759bfe29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->45 0x0000000000cdd9be _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdd9be)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

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c++20 clang:frontend:fuzzer clang:frontend Language frontend issues, e.g. anything involving "Sema" crash-on-invalid regression
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@yijan4845 @llvmbot