[Bug 1433540] Re: dot crashes with assertion failed on graph with some combinations of duplicated edges

[gouri]

Bug report for Ubuntu 14.04 is on https://bugs.launchpad.net/ubuntu/+source/graphviz/+bug/1433541
Bug report for Ubuntu 14.10 is on https://bugs.launchpad.net/ubuntu/+source/graphviz/+bug/1433540

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to graphviz in Ubuntu.
https://bugs.launchpad.net/bugs/1433540

Title:
  dot crashes with assertion failed on graph with some combinations of
  duplicated edges

Status in graphviz package in Ubuntu:
  New

Bug description:
  When processing some source files with a number of duplicated edges
  (that is, there exist some nodes A and B such that several edges A->B
  are declared with various properties), dot fails to produce an output.
  Usual source files are processed correctly.

  Bug exists upstream with detailed steps to reproduce on
  http://www.graphviz.org/mantisbt/view.php?id=2456 but I could not
  create an account there (or even login anonymously). This bug report
  on LaunchPad may be useful to confirm it affects multiple users.

  I suspect the reason is duplicated edges because the only Google
  answer on the assertion failure message is on that Mantis page, and
  the graphs I was working on do have a number of duplicated edges.

  1) The release of Ubuntu you are using, via 'lsb_release -rd' or
  System -> About Ubuntu

  LC_ALL=C lsb_release -rd

  Description:	Ubuntu 14.10
  Release:	14.10

  2) The version of the package you are using, via 'apt-cache policy
  pkgname' or by checking in Software Center

  apt-cache policy graphviz

  graphviz:
    Installé : 2.38.0-5ubuntu0.1
    Candidat : 2.38.0-5ubuntu0.1
   Table de version :
   *** 2.38.0-5ubuntu0.1 0
          500 http://fr.archive.ubuntu.com/ubuntu/ utopic-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu/ utopic-security/main amd64 Packages
          100 /var/lib/dpkg/status
       2.38.0-5build1 0
          500 http://fr.archive.ubuntu.com/ubuntu/ utopic/main amd64 Packages

  3) What you expected to happen

  A graphic file is generated.

  4) What happened instead

  Graphviz stops with message:

  dot: class2.c:149: merge_chain: Assertion
  `(((Agedgeinfo_t*)(((Agobj_t*)(e))->data))->to_virt) == ((void *)0)'
  failed.

  
  # Additional information

  Also observed with graphviz-2.36 on Ubuntu 14.04.

  Bug exists upstream with detailed steps to reproduce on
  http://www.graphviz.org/mantisbt/view.php?id=2456 but I could not
  create an account there (or even login anonymously). This bug report
  on LaunchPad may be useful to confirm it affects multiple users.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: graphviz 2.38.0-5ubuntu0.1
  ProcVersionSignature: Ubuntu 3.16.0-31.43-generic 3.16.7-ckt5
  Uname: Linux 3.16.0-31-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Mar 18 12:04:47 2015
  InstallationDate: Installed on 2015-03-04 (13 days ago)
  InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  SourcePackage: graphviz
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/graphviz/+bug/1433540/+subscriptions