Reading a deleted namespace scalar recreates its stash entry

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Avaliação

Dificuldade
4/5
Tempo estimado
3-5 dias
Facilidade para iniciantes
57/100
Tipo de issue
Bug
Clareza
Claramente especificada
Status de atividade
Ativa
Stack de tecnologia
java, perl
Domínio
backend

Direção de pesquisa

Start with RuntimeStash.deleteNamespace and the stash enumeration path in HashSpecialVariable, then inspect t/basic.t and the standalone reproduction described in the issue. Trace how a qualified undefined scalar is handled after its namespace is deleted. Done means the child namespace remains absent after the scalar read, matching Perl's behavior on both PerlOnJava backends.

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Descrição

area:runtime bug

Summary

Deleting a package namespace from its parent stash does not keep that namespace deleted after a qualified scalar is read. This makes Text::Template 1.61's _scrubpkg cleanup assertion fail in t/basic.t on both PerlOnJava backends. System Perl passes the assertion, and the complete upstream suite passes there (22 files, 184 tests). The failure is included in archived CPAN run 20261104-151051-20617.

Root cause

RuntimeStash.deleteNamespace removes the namespace's current slots and marks the package freed. But stash enumeration in HashSpecialVariable reconstructs child-package entries from any qualified global slot it finds. A later read such as $Cleanup::GEN0::test creates an undefined scalar slot; enumeration then infers GEN0:: as a live child stash from that slot and exposes it again. The enumeration path does not honor the freed-stash marker, so this implicit scalar autovivification makes exists $Cleanup::{"GEN0::"} true again. The standalone script in the comment reproduces the behavior without a CPAN dependency.

Expected behavior

Reading an undefined scalar below a namespace deleted from its parent stash must not recreate that child namespace entry. Perl leaves the child absent in the same sequence.

Linguagem predominante
Perl
Estrelas
65
Forks
8
Merge médio
5h 54min
PRs com merge (30d)
184

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