llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clangd-ubuntu-tsan` 
running on `clangd-ubuntu-clang` while building `clang` at step 5 
"build-clangd-clangd-index-server-clangd-indexer".

Full details are available at: 
https://lab.llvm.org/buildbot/#/builders/134/builds/16259

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (build-clangd-clangd-index-server-clangd-indexer) failure: build 
(failure)
...
1265.662 [6/8/3242] Building CXX object 
tools/clang/tools/extra/clangd/indexer/CMakeFiles/clangd-indexer.dir/IndexerMain.cpp.o
1266.858 [5/8/3243] Building CXX object 
tools/clang/tools/extra/clangd/index/remote/marshalling/CMakeFiles/obj.clangdRemoteMarshalling.dir/Marshalling.cpp.o
1266.894 [4/8/3244] Linking CXX static library lib/libclangdRemoteMarshalling.a
1266.929 [3/8/3245] Linking CXX static library lib/libclangdRemoteIndex.a
1268.675 [3/7/3246] Building CXX object 
tools/clang/tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/ExtractVariable.cpp.o
1269.470 [3/6/3247] Building CXX object 
tools/clang/tools/extra/clangd/tool/CMakeFiles/obj.clangdMain.dir/ClangdMain.cpp.o
1269.626 [3/5/3248] Building CXX object 
tools/clang/tools/extra/clangd/tool/CMakeFiles/obj.clangdMain.dir/Check.cpp.o
1269.674 [2/5/3249] Linking CXX static library lib/libclangdMain.a
1271.275 [2/4/3250] Building CXX object 
tools/clang/tools/extra/clangd/index/remote/server/CMakeFiles/clangd-index-server.dir/Server.cpp.o
1274.604 [1/4/3251] Linking CXX executable bin/clangd-indexer
FAILED: bin/clangd-indexer 
: && /usr/bin/clang++ -fPIC -fno-semantic-interposition 
-fvisibility-inlines-hidden -Werror=date-time 
-Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter 
-Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic 
-Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough 
-Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor 
-Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion 
-Wmisleading-indentation -Wctad-maybe-unsupported -fno-omit-frame-pointer 
-gline-tables-only -fsanitize=thread -fdiagnostics-color -ffunction-sections 
-fdata-sections -fno-common -Woverloaded-virtual -Wno-nested-anon-types -O3 
-DNDEBUG 
-Wl,-rpath-link,/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/./lib  
-Wl,--gc-sections 
tools/clang/tools/extra/clangd/indexer/CMakeFiles/clangd-indexer.dir/IndexerMain.cpp.o
 -o bin/clangd-indexer  -Wl,-rpath,"\$ORIGIN/../lib"  lib/libLLVMSupport.a  
-lpthread  lib/libclangAST.a  lib/libclangBasic.a  lib/libclangFrontend.a  
lib/libclangIndex.a  lib/libclangLex.a  lib/libclangTooling.a  
lib/libclangDaemon.a  lib/libclangdSupport.a  lib/libLLVMAArch64Info.a  
lib/libLLVMAMDGPUInfo.a  lib/libLLVMARMInfo.a  lib/libLLVMAVRInfo.a  
lib/libLLVMBPFInfo.a  lib/libLLVMHexagonInfo.a  lib/libLLVMLanaiInfo.a  
lib/libLLVMLoongArchInfo.a  lib/libLLVMMipsInfo.a  lib/libLLVMMSP430Info.a  
lib/libLLVMNVPTXInfo.a  lib/libLLVMPowerPCInfo.a  lib/libLLVMRISCVInfo.a  
lib/libLLVMSparcInfo.a  lib/libLLVMSPIRVInfo.a  lib/libLLVMSystemZInfo.a  
lib/libLLVMVEInfo.a  lib/libLLVMWebAssemblyInfo.a  lib/libLLVMX86Info.a  
lib/libLLVMXCoreInfo.a  lib/libclangDependencyScanning.a  
lib/libclangToolingSyntax.a  lib/libclangTidyAndroidModule.a  
lib/libclangTidyAbseilModule.a  lib/libclangTidyAlteraModule.a  
lib/libclangTidyBoostModule.a  lib/libclangTidyCERTModule.a  
lib/libclangTidyConcurrencyModule.a  lib/libclangTidyDarwinModule.a  
lib/libclangTidyFuchsiaModule.a  lib/libclangTidyHICPPModule.a  
lib/libclangTidyCppCoreGuidelinesModule.a  lib/libclangTidyBugproneModule.a  
lib/libclangAnalysisFlowSensitiveModels.a  lib/libclangAnalysisFlowSensitive.a  
lib/libclangTidyGoogleModule.a  lib/libclangTidyLinuxKernelModule.a  
lib/libclangTidyLLVMModule.a  lib/libclangTidyLLVMLibcModule.a  
lib/libclangTidyMiscModule.a  lib/libclangIncludeCleaner.a  
lib/libclangToolingInclusionsStdlib.a  lib/libclangTidyModernizeModule.a  
lib/libclangTidyObjCModule.a  lib/libclangTidyOpenMPModule.a  
lib/libclangTidyPerformanceModule.a  lib/libclangTidyPortabilityModule.a  
lib/libclangTidyReadabilityModule.a  lib/libclangTidyZirconModule.a  
lib/libclangTidyMPIModule.a  lib/libclangTidyUtils.a  lib/libclangTidy.a  
lib/libclangTooling.a  lib/libclangStaticAnalyzerFrontend.a  
lib/libclangTransformer.a  lib/libclangToolingRefactoring.a  
lib/libclangStaticAnalyzerCheckers.a  lib/libclangStaticAnalyzerCore.a  
lib/libclangCrossTU.a  lib/libclangIndex.a  lib/libclangFrontend.a  
lib/libclangDriver.a  lib/libLLVMWindowsDriver.a  lib/libclangParse.a  
lib/libLLVMOption.a  lib/libclangSerialization.a  lib/libclangSema.a  
lib/libclangAPINotes.a  lib/libclangEdit.a  lib/libclangAnalysis.a  
lib/libclangASTMatchers.a  lib/libclangAST.a  lib/libclangSupport.a  
lib/libLLVMFrontendHLSL.a  lib/libclangFormat.a  
lib/libclangToolingInclusions.a  lib/libclangToolingCore.a  
lib/libclangRewrite.a  lib/libclangLex.a  lib/libclangBasic.a  
lib/libLLVMFrontendOpenMP.a  lib/libLLVMScalarOpts.a  
lib/libLLVMAggressiveInstCombine.a  lib/libLLVMInstCombine.a  
lib/libLLVMFrontendOffloading.a  lib/libLLVMTransformUtils.a  
lib/libLLVMObjectYAML.a  lib/libLLVMFrontendAtomic.a  lib/libLLVMAnalysis.a  
lib/libLLVMProfileData.a  lib/libLLVMSymbolize.a  lib/libLLVMDebugInfoPDB.a  
lib/libLLVMDebugInfoCodeView.a  lib/libLLVMDebugInfoMSF.a  
lib/libLLVMDebugInfoBTF.a  lib/libLLVMDebugInfoDWARF.a  lib/libLLVMObject.a  
lib/libLLVMMCParser.a  lib/libLLVMMC.a  lib/libLLVMIRReader.a  
lib/libLLVMBitReader.a  lib/libLLVMAsmParser.a  lib/libLLVMCore.a  
lib/libLLVMRemarks.a  lib/libLLVMBitstreamReader.a  lib/libLLVMTextAPI.a  
lib/libLLVMBinaryFormat.a  lib/libLLVMTargetParser.a  lib/libLLVMSupport.a  
-lrt  -ldl  -lpthread  -lm  /usr/lib/x86_64-linux-gnu/libz.so  
lib/libLLVMDemangle.a && :
/usr/bin/ld: Dwarf Error: Invalid or unhandled FORM value: 0x25.
lib/libclangSema.a(SemaHLSL.cpp.o): In function 
`clang::SemaHLSL::handleRootSignatureAttr(clang::Decl*, clang::ParsedAttr 
const&)':
SemaHLSL.cpp:(.text._ZN5clang8SemaHLSL23handleRootSignatureAttrEPNS_4DeclERKNS_10ParsedAttrE+0x151):
 undefined reference to 
`clang::hlsl::RootSignatureParser::RootSignatureParser(llvm::SmallVector<std::variant<llvm::hlsl::rootsig::DescriptorTable,
 llvm::hlsl::rootsig::DescriptorTableClause>, 6u>&, 
clang::hlsl::RootSignatureLexer&, clang::Preprocessor&)'
SemaHLSL.cpp:(.text._ZN5clang8SemaHLSL23handleRootSignatureAttrEPNS_4DeclERKNS_10ParsedAttrE+0x159):
 undefined reference to `clang::hlsl::RootSignatureParser::parse()'
clang++: error: linker command failed with exit code 1 (use -v to see 
invocation)
1275.062 [1/3/3252] Building CXX object 
tools/clang/tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/RemoveUsingNamespace.cpp.o
1275.860 [1/2/3253] Building CXX object 
tools/clang/tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/ExtractFunction.cpp.o
1275.989 [1/1/3254] Linking CXX executable bin/clangd-index-server
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/134124
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