Xazax-hun wrote:
We started to see a CI failure around the time this PR landed in
https://green.lab.llvm.org/job/llvm.org/job/clang-stage2-Rthinlto/1079/
The build hangs in this step (using a stage 2 compiler):
```
12:39:17 [384/5387] : &&
DYLD_LIBRARY_PATH=/Users/ec2-user/jenkins/workspace/llvm.org/clang-stage2-Rthinlto/host-compiler/lib/
"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool"
-static -no_warning_for_no_symbols -o lib/libbenchmark_main.a
third-party/benchmark/src/CMakeFiles/benchmark_main.dir/benchmark_main.cc.o && :
```
This is where the compiler seems to hang:
```
Analysis of sampling clang++ (pid 12682) every 1 millisecond
Process: clang-22 [12682]
Path: /Users/*/clang-22
Load Address: 0x1054d1000
Identifier: clang-22
Version: 22.0.0git (0)
Code Type: X86-64
Platform: macOS
Parent Process: ninja [12327]
Date/Time: 2025-08-12 17:39:29.604 +0000
Launch Time: 2025-08-12 04:30:26.246 +0000
OS Version: macOS 15.1.1 (24B91)
Report Version: 7
Analysis Tool: /usr/bin/sample
Physical footprint: 83.4M
Physical footprint (peak): 83.4M
Idle exit: untracked
----
Call graph:
120 Thread_240531 DispatchQueue_1: com.apple.main-thread (serial)
120 start (in dyld) + 1805 [0x7ff804e212cd]
120 main (in clang-22) + 128 [0x1054e1670]
120 clang_main(int, char**, llvm::ToolContext const&) (in clang-22)
+ 5620 [0x1054d4254]
120
clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (in
clang-22) + 352 [0x108d26fa0]
120
clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool)
const (in clang-22) + 143 [0x108d0cc5f]
120
clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&,
clang::driver::Command const*&, bool) const (in clang-22) + 524 [0x108d0ca5c]
120
clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>,
std::basic_string<char>*, bool*) const (in clang-22) + 297 [0x108d433a9]
120
llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (in
clang-22) + 130 [0x10b389442]
120 llvm::function_ref<void
()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>,
std::basic_string<char>*, bool*) const::$_0>(long) (in clang-22) + 30
[0x108d43ace]
120 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&,
llvm::ToolContext const&) (in clang-22) + 395 [0x1054d49db]
120 cc1_main(llvm::ArrayRef<char const*>, char
const*, void*) (in clang-22) + 4289 [0x1054d77e1]
120
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (in clang-22) + 632
[0x106d7c3e8]
120
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (in clang-22) +
941 [0x108bfc91d]
120 clang::FrontendAction::Execute() (in
clang-22) + 42 [0x108c7a14a]
120 clang::ParseAST(clang::Sema&, bool, bool)
(in clang-22) + 782 [0x108ec538e]
120
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&,
clang::Sema::ModuleImportState&) (in clang-22) + 1528 [0x108f9c968]
120
clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&,
clang::ParsedAttributes&, clang::ParsingDeclSpec*) (in clang-22) + 1391
[0x108f9e33f]
120
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&,
clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (in
clang-22) + 625 [0x108f9f8e1]
120
clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&,
clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (in
clang-22) + 1314 [0x108fa00a2]
120
clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&,
clang::DeclaratorContext, clang::ParsedAttributes&,
clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*,
clang::Parser::ForRangeInit*) (in clang-22) + 4893 [0x108ed9a1d]
120
clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*)
(in clang-22) + 2342 [0x108fa0b86]
120
clang::Sema::ActOnDefaultCtorInitializers(clang::Decl*) (in clang-22) + 101
[0x1093acc95]
120
clang::Sema::SetCtorInitializers(clang::CXXConstructorDecl*, bool,
llvm::ArrayRef<clang::CXXCtorInitializer*>) (in clang-22) + 3444 [0x1093a8f84]
120
CollectFieldInitializer(clang::Sema&, (anonymous namespace)::BaseAndFieldInfo&,
clang::FieldDecl*, clang::IndirectFieldDecl*) (in clang-22) + 3017
[0x1093aa979]
120
clang::InitializationSequence::InitializeFrom(clang::Sema&,
clang::InitializedEntity const&, clang::InitializationKind const&,
llvm::MutableArrayRef<clang::Expr*>, bool, bool) (in clang-22) + 2750
[0x10956527e]
120
TryConstructorInitialization(clang::Sema&, clang::InitializedEntity const&,
clang::InitializationKind const&, llvm::MutableArrayRef<clang::Expr*>,
clang::QualType, clang::QualType, clang::InitializationSequence&, bool, bool)
(in clang-22) + 565 [0x109583df5]
120
clang::Sema::LookupConstructors(clang::CXXRecordDecl*) (in clang-22) + 152
[0x1095a60a8]
120
clang::DeclContext::lookupImpl(clang::DeclarationName, clang::DeclContext
const*) const (in clang-22) + 733 [0x109d4f6bd]
120
clang::ASTReader::FindExternalVisibleDeclsByName(clang::DeclContext const*,
clang::DeclarationName, clang::DeclContext const*) (in clang-22) + 453
[0x108ff3795]
120
_ZZN5clang9ASTReader30FindExternalVisibleDeclsByNameEPKNS_11DeclContextENS_15DeclarationNameES3_ENK3$_0clIRNS_13serialization20MultiOnDiskHashTableINS7_6reader29ASTDeclContextNameLookupTraitEEERS4_EEDaOT_OT0_
(in clang-22) + 105 [0x108ff39c9]
120
clang::ASTReader::GetDecl(clang::GlobalDeclID) (in clang-22) + 149
[0x108fe7615]
120
clang::ASTReader::ReadDeclRecord(clang::GlobalDeclID) (in clang-22) + 3749
[0x10905f335]
120
clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation,
llvm::function_ref<void ()>) (in clang-22) + 47 [0x10a3621af]
120
clang::ASTDeclReader::Visit(clang::Decl*) (in clang-22) + 21 [0x1090338f5]
120
clang::ASTDeclReader::VisitCXXMethodDecl(clang::CXXMethodDecl*) (in clang-22)
+ 22 [0x109040d36]
120
clang::ASTDeclReader::VisitFunctionDecl(clang::FunctionDecl*) (in clang-22) +
5529 [0x109038089]
120 clang::ASTDeclReader::findExisting(clang::NamedDecl*) (in clang-22) + 995
[0x10905a8b3]
120 clang::ASTContext::isSameEntity(clang::NamedDecl const*, clang::NamedDecl
const*) const (in clang-22) + 1921 [0x109b58981]
120 clang::NamedDecl::getLinkageInternal() const (in clang-22) + 168
[0x109d2cd78]
120 clang::LinkageComputer::getLVForDecl(clang::NamedDecl const*,
clang::LVComputationKind) (in clang-22) + 151 [0x109d29eb7]
120 clang::LinkageComputer::getLVForClassMember(clang::NamedDecl const*,
clang::LVComputationKind, bool) (in clang-22) + 648 [0x109d2b9b8]
120 clang::Type::getLinkage() const (in clang-22) + 14 [0x10a20ac3e]
120 clang::TypePropertyCache<(anonymous
namespace)::Private>::ensure(clang::Type const*) (in clang-22) + 151
[0x10a20ad07]
120 clang::TypePropertyCache<(anonymous
namespace)::Private>::ensure(clang::Type const*) (in clang-22) + 664
[0x10a20af08]
120 clang::TypePropertyCache<(anonymous
namespace)::Private>::ensure(clang::Type const*) (in clang-22) + 380
[0x10a20adec]
120 clang::NamedDecl::getLinkageInternal() const (in clang-22)
+ 168 [0x109d2cd78]
91 clang::LinkageComputer::getLVForDecl(clang::NamedDecl
const*, clang::LVComputationKind) (in clang-22) + 351 [0x109d29f7f]
+ 74
clang::Redeclarable<clang::TagDecl>::DeclLink::getPrevious(clang::TagDecl
const*) const (in clang-22) + 6,1,... [0x1070c6706,0x1070c6701,...]
+ 17 clang::TagDecl::getNextRedeclarationImpl() (in
clang-22) + 0,7,... [0x109d3da70,0x109d3da77,...]
29 clang::LinkageComputer::getLVForDecl(clang::NamedDecl
const*, clang::LVComputationKind) (in clang-22) + 337,315,...
[0x109d29f71,0x109d29f5b,...]
Total number in stack (recursive counted multiple, when >=5):
Sort by top of stack, same collapsed (when >= 5):
clang::Redeclarable<clang::TagDecl>::DeclLink::getPrevious(clang::TagDecl
const*) const (in clang-22) 74
clang::LinkageComputer::getLVForDecl(clang::NamedDecl const*,
clang::LVComputationKind) (in clang-22) 29
clang::TagDecl::getNextRedeclarationImpl() (in clang-22) 1
```
Any ideas what might be going on here?
https://github.com/llvm/llvm-project/pull/147835
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