[Bug 1668450] Re: perl_clone of libperl causes segfault on xenial, yakkety, zesty ok on trusty

[Mitch Capper]

This is reported upstream now:
https://rt.perl.org/Public/Bug/Display.html?id=130949

** Bug watch added: rt.perl.org/Public/ #130949
   https://rt.perl.org/Public/Ticket/Display.html?id=130949

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Title:
  perl_clone of libperl causes segfault on xenial, yakkety, zesty ok on
  trusty

Status in perl package in Ubuntu:
  New

Bug description:
  For using perl in C++ programs unfortunately a simple call to
  perl_clone causes a segfault.  The problem does not happen on trusty,
  but does on later Ubuntu iterations.   Could be perl version (5.18 OK
  vs 5.22/5.24 newer that fault) but as each platform only supports one
  version of perl can't easily test the others.

  (gdb) run
  Starting program: /a.out
  b[Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

  Program received signal SIGSEGV, Segmentation fault.
  0x00007ffff7a6f13a in Perl_padnamelist_dup () from /usr/lib/x86_64-linux-gnu/libperl.so.5.24
  (gdb) bt
  #0  0x00007ffff7a6f13a in Perl_padnamelist_dup () from /usr/lib/x86_64-linux-gnu/libperl.so.5.24
  #1  0x00007ffff7adca9f in perl_clone () from /usr/lib/x86_64-linux-gnu/libperl.so.5.24
  #2  0x000055555555492d in main () at test.c:10
  (gdb) Quit
  (gdb)
  #0  0x00007ffff7a6f13a in Perl_padnamelist_dup () from /usr/lib/x86_64-linux-gnu/libperl.so.5.24
  #1  0x00007ffff7adca9f in perl_clone () from /usr/lib/x86_64-linux-gnu/libperl.so.5.24
  #2  0x000055555555492d in main () at test.c:10

  Sample system info from where broken:
  Description:    Ubuntu 16.04.2 LTS
  Release:        16.04
        perl |   5.22.1-9 | http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
  libperl-dev |   5.22.1-9 | http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages

  
  to reproduce with docker:
  docker run -t -i ubuntu:zesty bash
  docker run -t -i ubuntu:yakkety bash
  docker run -t -i ubuntu:xenial bash

  ok with:
  docker run -t -i ubuntu:trusty bash

  then some packages:
  apt-get update && apt-get install build-essential libperl-dev

  
  finally the attached test.c file place and compile with:

  
  and run with perl version:
  trusty: 
  gcc -g test.c -I/usr/lib/perl/5.18.2/CORE/ -lperl && ./a.out
  xenial/yakkety (yakkety might be 5.22.2):
  gcc -g test.c -I/usr/lib/x86_64-linux-gnu/perl/5.22.1/CORE/ -lperl && ./a.out
  zesty:
  gcc -g test.c -I/usr/lib/x86_64-linux-gnu/perl/5.24.1/CORE/ -lperl && ./a.out

  
  Others cause seg fault, trusty is fine.

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