Cpanel::JSON::XS crash under Perl 5.26.0

[Athanasius]

I’m trying to install MongoDB for Strawberry Perl 5.26.0:

This is perl 5, version 26, subversion 0 (v5.26.0) built for MSWin32-x
+64-multi-thread-ld

under Windows 8.1 64-bit. One of MongoDB’s dependencies is BSON. which not only fails to install but actually crashes the Perl interpreter while doing so.

After some debugging I eventually reduced the problem code to the following SSCCE:

use strict;
use warnings;
use JSON::MaybeXS;

my        $json_codec = JSON::MaybeXS->new;
print ref $json_codec, "\n";
print     $json_codec->encode( { d => 1.0 } ), "\n";

Note that I have the following modules installed:

16:27 >mversion -f JSON::MaybeXS Cpanel::JSON::XS JSON::XS JSON::PP
JSON::MaybeXS 1.003009
Cpanel::JSON::XS 3.0233
JSON::XS 3.04
JSON::PP 2.94

16:27 >

Now to the point: when I run the SSCCE, I get the following output:

19:26 >perl 1800_SoPW.pl
Cpanel::JSON::XS

and the Perl interpreter crashes. But if I change the JSON module:

19:26 >perl -MJSON::XS 1800_SoPW.pl
JSON::XS
{"d":1}

19:27 >

the code completes successfully. I have also tested the SSCCE on Strawberry Perl 5.24.1, and it runs without a problem:

16:37 >perl 1800_SoPW.pl
Cpanel::JSON::XS
{"d":1.0}

16:38 >

So, I have two sets of questions:

(1) Can other monks confirm this behaviour under Perl 5.26.0? If so, is it confined to Windows or does it occur on other platforms as well? And does anyone know of a change from 5.24 to 5.26 which could account for this? Should I report it as a bug under Cpanel::JSON::XS?

(2) Until the bug is fixed, what’s the best way to prevent JSON::MaybeXS from defaulting to Cpanel::JSON::XS? I can add -MJSON::XS to the command line when invoking a Perl script directly, but how can I get cpanm to do this? Or will I need to uninstall Cpanel::JSON::XS from my system?

Thanks,

[kevbot]

Hi Athanasius,

Your code works fine for me using perl-5.22.2 or perl-5.26.0 on macOS Sierra. Both perls were installed with perlbrew using -Dusethreads.

[Anonymous Monk]

Cpanel::JSON::XS 3.0233

Thats not the latest. 3.0218 - crashes/segfaults on Windows + long double (MSWin32-x64-multi-thread-ld) · Issue #71 · rurban/Cpanel-JSON-XS · GitHub

[Athanasius]

Thanks for the reminder, I forgot that I did try to upgrade to the latest version (viz., 3.027), but the installation also crashed.

The bug report you cite claims that the crash was fixed in version 3.0219. So is the problem I’m seeing a new bug, or a reappearance of the old one?

Cheers,

[Anonymous Monk]

Too early to swy what it is. What is the message in admin tools log?