[Bug 1451028] Re: git-svn coredumps

[James McCoy]

[Impact]

Subversion's Perl bindings randomly crash.  This is most typically seen
when using git-svn, since it's a heavy user of the bindings.

[Test case]

"git svn clone -s svn://svn.code.sf.net/p/flightgear/fgaddon".  With the
existing package in xenial, git-svn kept crashing while trying to
checkout the first revision.  With the updated package, I've
successfully processed 2400 revisions before being interrupted by a
network issue.

[Regression potential]

This brings the code up to date with current released Subversion code in
this area.  The upstream release which included these changes (1.9.5)
has been in Debian since 2016-11-29 and I've received no further reports
of issues.

** Patch added: "subversion.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/subversion/+bug/1451028/+attachment/5082105/+files/subversion.debdiff

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Title:
  git-svn coredumps

Status in subversion:
  New
Status in git package in Ubuntu:
  Confirmed
Status in subversion package in Ubuntu:
  Confirmed

Bug description:
  When trying to  "git svn fetch" git-svn coredumps:
   
  > gdb perl core
  GNU gdb (Ubuntu 7.8-1ubuntu4) 7.8.0.20141001-cvs
  ...
  [New LWP 3503]
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
  Core was generated by `/usr/bin/perl /usr/lib/git-core/git-svn clone --rewrite-root=x://. svn+ssh://iw'.
  Program terminated with signal SIGSEGV, Segmentation fault.
  #0  0x00002b39f9092a31 in _wrap_svn_txdelta_apply ()
     from /usr/lib/x86_64-linux-gnu/perl5/5.20/auto/SVN/_Delta/_Delta.so
  (gdb) where
  #0  0x00002b39f9092a31 in _wrap_svn_txdelta_apply ()
     from /usr/lib/x86_64-linux-gnu/perl5/5.20/auto/SVN/_Delta/_Delta.so
  #1  0x00002b39f5400f1b in Perl_pp_entersub ()
     from /usr/lib/x86_64-linux-gnu/libperl.so.5.20
  ...

  So right now git-svn seems to be useless on ubuntu 14.10 (Linux lubdev
  3.16.0-24-generic #32-Ubuntu SMP Tue Oct 28 13:07:32 UTC 2014 x86_64
  x86_64 x86_64 GNU/Linux).

  It seems to be related to:
  http://svn.haxx.se/dev/archive-2015-03/0220.shtml (follow thread) and https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=780246

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