Perl_sv_setsv_flags: Assertion `((svtype)((_gvgp)->sv_flags & 0xff)) == SVt_PVGV || ((svtype)((_gvgp)->sv_flags & 0xff)) == SVt_PVLV' failed (sv.c:4569)

[p5pRT]

Migrated from rt.perl.org#129869 (status was 'resolved')

Searchable as RT129869$

[p5pRT]

From @geeknik

Triggered in Perl v5.25.6 (v5.25.5-76-g91dca83) with AFL+ASAN but it fails
the same way in non-ASAN builds.

./perl -e '%​::=0;@​0=*0=*​::​::=​::'

perl​: sv.c​:4569​: Perl_sv_setsv_flags​: Assertion
`((svtype)((_gvgp)->sv_flags & 0xff)) == SVt_PVGV ||
((svtype)((_gvgp)->sv_flags & 0xff)) == SVt_PVLV' failed.
Aborted

[p5pRT]

From zefram@fysh.org

Brian Carpenter wrote​:

./perl -e '%​::=0;@​0=*0=*​::​::=​::'

Reduces to '%​::=();*z=​::'. The assertion comes from glob assignment code,
where the coercion of the rhs to a GV surprisingly returns an undef.

-zefram

[p5pRT]

The RT System itself - Status changed from 'new' to 'open'

[p5pRT]

From zefram@fysh.org

Further conceptually reduces to​:

$ perl -MDevel​::Peek=Dump -e '%​::=(); Dump *{"​::"}'
SV = NULL(0x0) at 0x2401988
  REFCNT = 1
  FLAGS = ()

-zefram

[p5pRT]

From zefram@fysh.org

Fixed in 120921a.

-zefram

[p5pRT]

@iabyn - Status changed from 'open' to 'pending release'

[p5pRT]

From @khwilliamson

Thank you for filing this report. You have helped make Perl better.

With the release today of Perl 5.26.0, this and 210 other issues have been
resolved.

Perl 5.26.0 may be downloaded via​:
https://metacpan.org/release/XSAWYERX/perl-5.26.0

If you find that the problem persists, feel free to reopen this ticket.

[p5pRT]

@khwilliamson - Status changed from 'pending release' to 'resolved'