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Postings from June 2019
On Tue, 04 Jun 2019 04:15:59 GMT, hv wrote:
> On Mon, 03 Jun 2019 19:22:56 -0700, jkeenan wrote:
> > On Tue, 04 Jun 2019 01:15:35 GMT, hv wrote:
> > > On Mon, 03 Jun 2019 17:14:02 -0700, jkeenan@pobox.com wrote:
> > > > The following smoke test indicates that a recent change to blead
> > > > is
> > > > causing failures in t/op/sprintf2.t on FreeBSD-11.
> > > [...]
> > > > op/sprintf2.t (Wstat: 2304 Tests: 1699 Failed: 0)
> > > > Non-zero exit status: 9
> > >
> > > It's this non-zero exit status that's making it a fail. That's
> > > reporting that it terminated with a SEGV.
> >
> > I haven't used gdb in years, so I'm fumbling around.
> >
> > Does this help?
>
> Well, it is exactly what I asked for.
>
> > #13 0x00000000004f4788 in Perl_vcroak (my_perl=0x801e22000,
> > pat=0x801f56838 "\030 �\001\b", args=0x7fffffffe680) at util.c:1711
> > #14 0x00000000004f1b27 in Perl_croak_nocontext (pat=<value optimized
> > out> ) at util.c:1745
> > #15 0x000000000044c57e in Perl_sys_term () at perl.c:146
> > #16 0x0000000000421472 in main (argc=<value optimized out>,
> > argv=<value optimized out>, env=0x7fffffffe770)
> > at perlmain.c:155
>
> We're in sys_term, so most of the interpreter has already been wiped
> out, but we're then calling croak(), which relies on the interpreter's
> infrastructure.
>
> My best guess is that we're hitting 'Perl_croak_nocontext("panic:
> MUTEX_UNLOCK (%d) [%s:%d]" ...)' in one of the MUTEX_UNLOCK calls, and
> some wild writes have corrupted both one of our mutexes and perhaps
> this panic string.
>
> It seems like it'd be hard for it to get this far with that level of
> corruption though.
>
> I'll try harder to reproduce it: I'd need some interactive gdb work to
> diagnose it.
>
> Hugo
This is now showing up on other OSes. See:
http://perl5.test-smoke.org/submatrix?test=../t/op/sprintf2.t&pversion=5.31.1
--
James E Keenan (jkeenan@cpan.org)
---
via perlbug: queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=134172
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