[Bug 295296] LLVM 21.1.8 crash in 16-CURRENT 1600018

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295296

            Bug ID: 295296
           Summary: LLVM 21.1.8 crash in 16-CURRENT 1600018
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Keywords: crash
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: bugsbeastie@gmail.com
 Attachment #270741 text/plain
         mime type:

Created attachment 270741
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=270741&action=edit
poudriere log

while building cad/OrcaSlicer in poudriere, /usr/bin/c++ crashed (see details
in the attached poudriere log):

 #8 0x0000026cef3130d4 raise
/usr/local/poudriere/jails/16amd64/usr/src/lib/libc/gen/raise.c:0:10
 #9 0x0000026cef3c4de9 abort
/usr/local/poudriere/jails/16amd64/usr/src/lib/libc/stdlib/abort.c:67:17
#10 0x0000026cef2f5c11 (/lib/libc.so.7+0xabc11)
#11 0x0000026ce38248f2 (/usr/lib/libprivateclang.so.21+0x34248f2)
#12 0x0000026ce381f4d5 clang::ASTDeclReader::Visit(clang::Decl*)
/usr/local/poudriere/jails/16amd64/usr/src/contrib/llvm-project/clang/lib/Serialization/ASTReaderDecl.cpp:531:34
#13 0x0000026ce2237c4f
clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation,
llvm::function_ref<void ()>)
/usr/local/poudriere/jails/16amd64/usr/src/contrib/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:0:12
#14 0x0000026ce384874a clang::ASTReader::ReadDeclRecord(clang::GlobalDeclID)
/usr/local/poudriere/jails/16amd64/usr/src/contrib/llvm-project/clang/lib/Serialization/ASTReaderDecl.cpp:4244:40
#15 0x0000026ce37cff3b clang::ASTReader::GetDecl(clang::GlobalDeclID)
/usr/local/poudriere/jails/16amd64/usr/src/contrib/llvm-project/clang/lib/Serialization/ASTReader.cpp:0:5

The base system is from 2026-05-05, 658bb99db9c7 n285700.

I will update the system now to the latest main (both base and ports) and rerun
the bulk poudriere build to see, if it still there (the results will be in ~10
days).

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