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zitongzhoueric opened this issue Nov 4, 2024 · 3 comments
Open

[Clang] crashes with _Atomic _Complex int #114885

zitongzhoueric opened this issue Nov 4, 2024 · 3 comments
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c11 clang:codegen IR generation bugs: mangling, exceptions, etc. confirmed Verified by a second party crash-on-valid

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@zitongzhoueric
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To reproduce: https://godbolt.org/z/vvzPhaoTW
Clang trunk crashes on the following snippet

int foo() { 
    _Atomic int ok = (_Atomic int)2;
    _Atomic _Complex int buggy = (_Atomic _Complex int)2;
    return 0;
}

int main() { 
    return foo();
}
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-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>:7:1: current parser token 'int'
2.	<source>:1:5: LLVM IR generation of declaration 'foo'
3.	<source>:1:5: Generating code for declaration 'foo'
Program terminated with signal: SIGSEGV
Compiler returned: 139

Not sure if this is related to #111293, which reports the same assertion failure but doesn't crash clang without assertions
On clang trunk with assertions:

clang: /root/llvm-project/clang/include/clang/AST/Type.h:8792: const T* clang::Type::castAs() const [with T = clang::ComplexType]: Assertion `isa<T>(CanonicalType)' 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>:7:1: current parser token 'int'
2.	<source>:1:5: LLVM IR generation of declaration 'foo'
3.	<source>:1:5: Generating code for declaration 'foo'
 #0 0x0000000003be87b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3be87b8)
 #1 0x0000000003be64bc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3be64bc)
 #2 0x0000000003b33df8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007bab5e042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007bab5e0969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007bab5e042476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007bab5e0287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007bab5e02871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007bab5e039e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x000000000440d793 (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x440d793)
#10 0x0000000004416496 (anonymous namespace)::ComplexExprEmitter::EmitCast(clang::CastKind, clang::Expr*, clang::QualType) CGExprComplex.cpp:0:0
#11 0x000000000441472d (anonymous namespace)::ComplexExprEmitter::Visit(clang::Expr*) CGExprComplex.cpp:0:0
#12 0x0000000004417298 clang::CodeGen::CodeGenFunction::EmitComplexExpr(clang::Expr const*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4417298)
#13 0x0000000004388aef clang::CodeGen::CodeGenFunction::EmitExprAsInit(clang::Expr const*, clang::ValueDecl const*, clang::CodeGen::LValue, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4388aef)
#14 0x0000000004396ed1 clang::CodeGen::CodeGenFunction::EmitAutoVarInit(clang::CodeGen::CodeGenFunction::AutoVarEmission const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4396ed1)
#15 0x00000000043974a6 clang::CodeGen::CodeGenFunction::EmitVarDecl(clang::VarDecl const&) (.part.0) CGDecl.cpp:0:0
#16 0x00000000043976f6 clang::CodeGen::CodeGenFunction::EmitDecl(clang::Decl const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x43976f6)
#17 0x0000000003f3c597 clang::CodeGen::CodeGenFunction::EmitDeclStmt(clang::DeclStmt const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f3c597)
#18 0x0000000003f53309 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f53309)
#19 0x0000000003f4af75 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f4af75)
#20 0x0000000003f52d24 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f52d24)
#21 0x0000000003fbbf14 clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fbbf14)
#22 0x0000000003fcdedc clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fcdedc)
#23 0x00000000040367aa clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x40367aa)
#24 0x00000000040316e5 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x40316e5)
#25 0x0000000004031acb clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4031acb)
#26 0x000000000403beb3 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#27 0x0000000004563246 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#28 0x0000000004553f78 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4553f78)
#29 0x00000000066e22f4 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x66e22f4)
#30 0x0000000004560df8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4560df8)
#31 0x000000000481b949 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x481b949)
#32 0x000000000479abbe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x479abbe)
#33 0x00000000049016de clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49016de)
#34 0x0000000000ce5b8f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xce5b8f)
#35 0x0000000000cdd84a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#36 0x00000000045a3f79 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 0x0000000003b342a4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3b342a4)
#38 0x00000000045a456f 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 0x000000000456a8dd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x456a8dd)
#40 0x000000000456b9cd 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+0x456b9cd)
#41 0x0000000004572d85 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4572d85)
#42 0x0000000000ce2a29 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xce2a29)
#43 0x0000000000bafbc4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbafbc4)
#44 0x00007bab5e029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#45 0x00007bab5e029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#46 0x0000000000cdd2fe _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xcdd2fe)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
@github-actions github-actions bot added the clang Clang issues not falling into any other category label Nov 4, 2024
@EugeneZelenko EugeneZelenko added clang:codegen IR generation bugs: mangling, exceptions, etc. crash Prefer [crash-on-valid] or [crash-on-invalid] and removed clang Clang issues not falling into any other category labels Nov 4, 2024
@llvmbot
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llvmbot commented Nov 4, 2024

@llvm/issue-subscribers-clang-codegen

Author: Zitong Zhou Eric (ZitongZhouEric)

To reproduce: https://godbolt.org/z/vvzPhaoTW Clang trunk crashes on the following snippet ```c int foo() { _Atomic int ok = (_Atomic int)2; _Atomic _Complex int buggy = (_Atomic _Complex int)2; return 0; }

int main() {
return foo();
}

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-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>:7:1: current parser token 'int'
  2. <source>:1:5: LLVM IR generation of declaration 'foo'
  3. <source>:1:5: Generating code for declaration 'foo'
    Program terminated with signal: SIGSEGV
    Compiler returned: 139
Not sure if this is related to https://github.com/llvm/llvm-project/issues/111293, which reports the same assertion failure but doesn't crash clang without assertions
On clang trunk with assertions:

clang: /root/llvm-project/clang/include/clang/AST/Type.h:8792: const T* clang::Type::castAs() const [with T = clang::ComplexType]: Assertion `isa<T>(CanonicalType)' 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>:7:1: current parser token 'int'
  2. <source>:1:5: LLVM IR generation of declaration 'foo'
  3. <source>:1:5: Generating code for declaration 'foo'
    #0 0x0000000003be87b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3be87b8)
    #1 0x0000000003be64bc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3be64bc)
    #2 0x0000000003b33df8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
    #3 0x00007bab5e042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
    #4 0x00007bab5e0969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
    #5 0x00007bab5e042476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
    #6 0x00007bab5e0287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
    #7 0x00007bab5e02871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
    #8 0x00007bab5e039e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
    #9 0x000000000440d793 (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x440d793)
    #10 0x0000000004416496 (anonymous namespace)::ComplexExprEmitter::EmitCast(clang::CastKind, clang::Expr*, clang::QualType) CGExprComplex.cpp:0:0
    #11 0x000000000441472d (anonymous namespace)::ComplexExprEmitter::Visit(clang::Expr*) CGExprComplex.cpp:0:0
    #12 0x0000000004417298 clang::CodeGen::CodeGenFunction::EmitComplexExpr(clang::Expr const*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4417298)
    #13 0x0000000004388aef clang::CodeGen::CodeGenFunction::EmitExprAsInit(clang::Expr const*, clang::ValueDecl const*, clang::CodeGen::LValue, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4388aef)
    #14 0x0000000004396ed1 clang::CodeGen::CodeGenFunction::EmitAutoVarInit(clang::CodeGen::CodeGenFunction::AutoVarEmission const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4396ed1)
    #15 0x00000000043974a6 clang::CodeGen::CodeGenFunction::EmitVarDecl(clang::VarDecl const&) (.part.0) CGDecl.cpp:0:0
    #16 0x00000000043976f6 clang::CodeGen::CodeGenFunction::EmitDecl(clang::Decl const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x43976f6)
    #17 0x0000000003f3c597 clang::CodeGen::CodeGenFunction::EmitDeclStmt(clang::DeclStmt const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f3c597)
    #18 0x0000000003f53309 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f53309)
    #19 0x0000000003f4af75 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f4af75)
    #20 0x0000000003f52d24 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f52d24)
    #21 0x0000000003fbbf14 clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fbbf14)
    #22 0x0000000003fcdedc clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fcdedc)
    #23 0x00000000040367aa clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x40367aa)
    #24 0x00000000040316e5 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x40316e5)
    #25 0x0000000004031acb clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4031acb)
    #26 0x000000000403beb3 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
    #27 0x0000000004563246 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
    #28 0x0000000004553f78 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4553f78)
    #29 0x00000000066e22f4 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x66e22f4)
    #30 0x0000000004560df8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4560df8)
    #31 0x000000000481b949 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x481b949)
    #32 0x000000000479abbe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x479abbe)
    #33 0x00000000049016de clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49016de)
    #34 0x0000000000ce5b8f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xce5b8f)
    #35 0x0000000000cdd84a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
    #36 0x00000000045a3f79 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 0x0000000003b342a4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3b342a4)
    #38 0x00000000045a456f 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 0x000000000456a8dd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x456a8dd)
    #40 0x000000000456b9cd 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+0x456b9cd)
    #41 0x0000000004572d85 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4572d85)
    #42 0x0000000000ce2a29 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xce2a29)
    #43 0x0000000000bafbc4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbafbc4)
    #44 0x00007bab5e029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
    #45 0x00007bab5e029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
    #46 0x0000000000cdd2fe _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xcdd2fe)
    clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
    Compiler returned: 134
</details>

@AaronBallman AaronBallman added c11 confirmed Verified by a second party crash-on-valid labels Nov 5, 2024
@llvmbot
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llvmbot commented Nov 5, 2024

@llvm/issue-subscribers-c11

Author: Zitong Zhou Eric (ZitongZhouEric)

To reproduce: https://godbolt.org/z/vvzPhaoTW Clang trunk crashes on the following snippet ```c int foo() { _Atomic int ok = (_Atomic int)2; _Atomic _Complex int buggy = (_Atomic _Complex int)2; return 0; }

int main() {
return foo();
}

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-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>:7:1: current parser token 'int'
  2. <source>:1:5: LLVM IR generation of declaration 'foo'
  3. <source>:1:5: Generating code for declaration 'foo'
    Program terminated with signal: SIGSEGV
    Compiler returned: 139
Not sure if this is related to https://github.com/llvm/llvm-project/issues/111293, which reports the same assertion failure but doesn't crash clang without assertions
On clang trunk with assertions:

clang: /root/llvm-project/clang/include/clang/AST/Type.h:8792: const T* clang::Type::castAs() const [with T = clang::ComplexType]: Assertion `isa<T>(CanonicalType)' 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>:7:1: current parser token 'int'
  2. <source>:1:5: LLVM IR generation of declaration 'foo'
  3. <source>:1:5: Generating code for declaration 'foo'
    #0 0x0000000003be87b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3be87b8)
    #1 0x0000000003be64bc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3be64bc)
    #2 0x0000000003b33df8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
    #3 0x00007bab5e042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
    #4 0x00007bab5e0969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
    #5 0x00007bab5e042476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
    #6 0x00007bab5e0287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
    #7 0x00007bab5e02871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
    #8 0x00007bab5e039e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
    #9 0x000000000440d793 (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x440d793)
    #10 0x0000000004416496 (anonymous namespace)::ComplexExprEmitter::EmitCast(clang::CastKind, clang::Expr*, clang::QualType) CGExprComplex.cpp:0:0
    #11 0x000000000441472d (anonymous namespace)::ComplexExprEmitter::Visit(clang::Expr*) CGExprComplex.cpp:0:0
    #12 0x0000000004417298 clang::CodeGen::CodeGenFunction::EmitComplexExpr(clang::Expr const*, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4417298)
    #13 0x0000000004388aef clang::CodeGen::CodeGenFunction::EmitExprAsInit(clang::Expr const*, clang::ValueDecl const*, clang::CodeGen::LValue, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4388aef)
    #14 0x0000000004396ed1 clang::CodeGen::CodeGenFunction::EmitAutoVarInit(clang::CodeGen::CodeGenFunction::AutoVarEmission const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4396ed1)
    #15 0x00000000043974a6 clang::CodeGen::CodeGenFunction::EmitVarDecl(clang::VarDecl const&) (.part.0) CGDecl.cpp:0:0
    #16 0x00000000043976f6 clang::CodeGen::CodeGenFunction::EmitDecl(clang::Decl const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x43976f6)
    #17 0x0000000003f3c597 clang::CodeGen::CodeGenFunction::EmitDeclStmt(clang::DeclStmt const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f3c597)
    #18 0x0000000003f53309 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f53309)
    #19 0x0000000003f4af75 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f4af75)
    #20 0x0000000003f52d24 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f52d24)
    #21 0x0000000003fbbf14 clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fbbf14)
    #22 0x0000000003fcdedc clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fcdedc)
    #23 0x00000000040367aa clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x40367aa)
    #24 0x00000000040316e5 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x40316e5)
    #25 0x0000000004031acb clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4031acb)
    #26 0x000000000403beb3 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
    #27 0x0000000004563246 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
    #28 0x0000000004553f78 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4553f78)
    #29 0x00000000066e22f4 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x66e22f4)
    #30 0x0000000004560df8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4560df8)
    #31 0x000000000481b949 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x481b949)
    #32 0x000000000479abbe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x479abbe)
    #33 0x00000000049016de clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49016de)
    #34 0x0000000000ce5b8f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xce5b8f)
    #35 0x0000000000cdd84a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
    #36 0x00000000045a3f79 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 0x0000000003b342a4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3b342a4)
    #38 0x00000000045a456f 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 0x000000000456a8dd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x456a8dd)
    #40 0x000000000456b9cd 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+0x456b9cd)
    #41 0x0000000004572d85 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4572d85)
    #42 0x0000000000ce2a29 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xce2a29)
    #43 0x0000000000bafbc4 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbafbc4)
    #44 0x00007bab5e029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
    #45 0x00007bab5e029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
    #46 0x0000000000cdd2fe _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xcdd2fe)
    clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
    Compiler returned: 134
</details>

@AaronBallman
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A more simple test case:

int main(void) {
  _Atomic _Complex float buggy = (_Atomic _Complex float)2.0f;
}

Removing the cast in the initialization causes the issue to go away.

@EugeneZelenko EugeneZelenko removed the crash Prefer [crash-on-valid] or [crash-on-invalid] label Nov 5, 2024
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c11 clang:codegen IR generation bugs: mangling, exceptions, etc. confirmed Verified by a second party crash-on-valid
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@AaronBallman @EugeneZelenko @zitongzhoueric @llvmbot