G'day ateague,

I tried running your code but found I didn't have JSON::XS installed under v5.24. On attempting to install using cpan, I got a message which in essence said:

"... standard perl versions 5.022 and up are not supported by JSON::XS."

The full message, in the spoiler below, was far more detailed.

As the installation ran to completion, I tried your script and got:

$ pm_1175565_json_xs_sv_chop_panic.pl
End of document 1
panic: sv_chop ptr=7faa01441e79, start=7faa0140eb30, end=7faa0140ecf0 
+at ./pm_1175565_json_xs_sv_chop_panic.pl line 41, <DATA> chunk 886.
[download]

The "panic: sv_chop %s" diagnostic was introduced in v5.12 (see "perl5120delta: New Diagnostics"):

• panic: sv_chop %s

  This new fatal error occurs when the C routine Perl_sv_chop() was passed a position that is not within the scalar's string buffer. This could be caused by buggy XS code, and at this point recovery is not possible.

I don't have sufficient knowledge of Perl's 'C' internals to help further on that front.

You could try installing JSON::XS under a version of Perl earlier than v5.22; however, given ++stevieb's results under v5.16.3, you should probably look more closely at your script for other issues.

Also note that the current version of JSON (2.90) has (in its VERSION section):

"This version is compatible with JSON::XS 2.34 and later. (Not yet compatble to JSON::XS 3.0x.)"

So, perhaps you might have more success with earlier versions of both Perl and JSON::XS.