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Sub::Quote deferred subs lose identity across threads

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Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
52/100
Tipo de issue
Error
Claridad
Bastante claro
Estado de actividad
Activo
Stack tecnológico
perl
Área
backend, testing-qa

Línea de trabajo

Comienza con t/sub-quote-threads.t y reprodúcelo con los dos comandos mostrados para los backends de JVM e intérprete. Lee Sub/Defer.pm alrededor de la línea 75 y su implementación de CLONE; después, sigue las referencias a deferred-sub y %DEFERRED durante la creación de hilos. El trabajo estará terminado cuando los subs quoted y deferred conserven su identidad y la prueba de regresión específica pase en ambos backends.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

Summary

Sub::Quote 2.006009 fails when quoted/deferred subs are retrieved or invoked from PerlOnJava threads. The failure reproduces on both the JVM and interpreter backends.

Reproduction

The CPAN random tester record is:

2026-09-18 07:06:07 FAIL Sub::Quote Sub::Defer ... 5430 5435 5/5435 subtests failed; 1/15 test programs failed

The failing test is:

t/sub-quote-threads.t

Using the built distribution with its library and test-library paths:

timeout 120 ./jperl -I<build>/blib/lib -I<build>/t/lib <build>/t/sub-quote-threads.t
timeout 120 ./jperl --interpreter -I<build>/blib/lib -I<build>/t/lib <build>/t/sub-quote-threads.t

Both backends fail identically: 5 of 6 assertions fail. The only passing assertion is the unquoted One case. Quoted/deferred sub retrieval and execution return undef, including the two-thread cases.

The complete CPAN run has 14 of 15 test programs passing; only t/sub-quote-threads.t fails. PerlOnJava also emits:

Use of uninitialized value in hash element at .../Sub/Defer.pm line 75

Expected behavior

System Perl passes the complete oracle run: 7036/7036 tests, including t/sub-quote-threads.t.

Technical analysis

Sub::Defer::undefer_sub looks up deferred-sub metadata in %DEFERRED using the deferred sub reference. Sub::Defer provides a CLONE implementation specifically to repair stringified subreference keys after threading.

On PerlOnJava, the lookup at Sub/Defer.pm line 75 receives an undefined or otherwise non-matching key after the thread boundary. This indicates that thread cloning is not preserving or remapping the identity/metadata of deferred quoted subs as required by Sub::Defer::CLONE.

The issue is present in both execution backends, so it appears to be shared runtime/thread-cloning behavior rather than a JVM-backend-only problem or a module-specific compilation issue.

Impact

Non-threaded Sub::Quote functionality passes, but applications using quoted/deferred subs from Perl threads can silently receive undef or fail to invoke the intended subroutine. This is a compatibility bug affecting modules that use Sub::Quote together with threads.

Suggested investigation

  1. Trace cloning of the deferred sub reference and the %DEFERRED metadata across thread creation.
  2. Compare PerlOnJava's handling of CLONE and stringified subreference keys with system Perl.
  3. Add a focused project-owned regression test covering quote_sub, quoted_from_sub, unquote_sub, and deferred-sub invocation from a child thread on both backends.
Lenguaje dominante
Perl
Estrellas
64
Forks
7
Merge medio
4 h 27 min
PR fusionados (30 d)
178

Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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