[Bug 236937] libxo =xml Segmentation fault with a huge string (>30000)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236937

            Bug ID: 236937
           Summary: libxo =xml Segmentation fault with a huge string
                    (>30000)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: alfix86 at gmail.com

I am adding libxo support to a 'sysctl(8)' clone, libxo=xml fails with a huge
string (example "sysctl debug.witness.fullgraph"). The problem is reproducible
and described by the file:

https://gitlab.com/alfix/nsysctl/blob/master/problem-xo-huge-string.c

(uname -a FreeBSD fbsd 13.0-CURRENT FreeBSD 13.0-CURRENT r345315 GENERIC 
amd64)

Regards,
Alfonso

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