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[clang] PCH deserialization heap-use-after-free in ASTReader::LoadExternalSpecializationsImpl

clang:PCHPrecompiled headersPrecompiled headers

crashPrefer [crash-on-valid] or [crash-on-invalid]Prefer [crash-on-valid] or [crash-on-invalid]

incompleteIssue not complete (e.g. missing a reproducer, build arguments, etc.)Issue not complete (e.g. missing a reproducer, build arguments, etc.)

Status: Open.

#196482 In llvm/llvm-project;

· mzukovec opened on May 8, 2026

#pragma include_alias registers the wrong alias key when spelling cleaning is needed

new issue

Status: Open.

#196478 In llvm/llvm-project;

· sfu2 opened on May 8, 2026

[clang] Missing optimization for typeid on a final class reference

c++

llvm:optimizations

missed-optimization

Status: Open.

#196476 In llvm/llvm-project;

· Mryange opened on May 8, 2026

Ridiculous error after #if defined(__COUNTER__), error: '__COUNTER__' is a C2y extension

c2y

clang:diagnosticsNew/improved warning or error message in Clang, but not in clang-tidy or static analyzerNew/improved warning or error message in Clang, but not in clang-tidy or static analyzer

Status: Open.

#196474 In llvm/llvm-project;

· rnichollx opened on May 8, 2026

[LifetimeSafety] Detect assignments of std::pair of view

clang:temporal-safetyIssue/FR relating to the lifetime analysis in Clang (-Wdangling, -Wreturn-local-addr)Issue/FR relating to the lifetime analysis in Clang (-Wdangling, -Wreturn-local-addr)

false-negativeWarning doesn't fire when it shouldWarning doesn't fire when it should

Status: Open.

Bug

#196470 In llvm/llvm-project;

· usx95 opened on May 8, 2026

[Clang] Missing Cleanup for lambda init-capture temporary in default member initializer

c++

regression:19Regression in 19 releaseRegression in 19 release

Status: Open.

#196469 In llvm/llvm-project;

· yuxuanchen1997 opened on May 8, 2026

clang -O3 reuses stack slot for escaped local across setjmp/longjmp

llvm:optimizations

miscompilation

Status: Open.

Bug

#196468 In llvm/llvm-project;

· IshwaraK opened on May 8, 2026

[clang] assertion failure with constexpr array new during variable initialization

c++26

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

constexprAnything related to constant evaluationAnything related to constant evaluation

crash-on-valid

Status: Open.

Bug

#196450 In llvm/llvm-project;

· efriedma-quic opened on May 8, 2026

clang-22 crashes when loading prebuilt modules

clang:modulesC++20 modules and Clang Header ModulesC++20 modules and Clang Header Modules

crashPrefer [crash-on-valid] or [crash-on-invalid]Prefer [crash-on-valid] or [crash-on-invalid]

Status: Open.

Bug

#196441 In llvm/llvm-project;

· mdvorak7 opened on May 7, 2026

clang++ crashes when I'm not prefixing dependent types with "typename" and using a wrong function return type

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

crash-on-valid

Status: Open.

Bug

#196438 In llvm/llvm-project;

· GasparVardanyan opened on May 7, 2026

Type conflict between Python's pid_t and lldb's Host/windows/PosixAPI.h

infrastructureBugs about LLVM infrastructureBugs about LLVM infrastructure

Status: Open.

#196437 In llvm/llvm-project;

· jimingham opened on May 7, 2026

x86-64 optimization: Use 32-bit popcnt instruction if operand is known to fit

backend:X86

llvm:optimizations

missed-optimization

Status: Open.

#196434 In llvm/llvm-project;

· Explorer09 opened on May 7, 2026