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perl 5.40.2 fails to run simple script when compiled with Clang-21.1.0-rc2

llvm:optimizations

miscompilation

needs-reductionLarge reproducer that should be reduced into a simpler formLarge reproducer that should be reduced into a simpler form

regression:21Regression in 21 releaseRegression in 21 release

Status: Open.

Bug

#152241 In llvm/llvm-project;

· kraj opened on Aug 6, 2025

>4GB offsets in MCDataFragment in llvm-21 (llvm-dwp OOM)

llvm:mcMachine (object) codeMachine (object) code

Status: Open.

#168923 In llvm/llvm-project;

· MatzeB opened on Nov 20, 2025

[flang] Segmentation fault when parsing nested loop in OpenMP region

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

flang:ir

flang:openmp

Status: Open.

Bug

#176275 In llvm/llvm-project;

· ivan-pi opened on Jan 16, 2026