[Bug 1758970] [NEW] dot segfault in libgvc.so.6.0.0

[Erich Schubert]

Public bug reported:

Dotty segfaults on many UMLgraph generated maps for me.

Here is a trimmed down example:
---
digraph "G" {
	c1 [ label = <<table port="p"> <tr><td>Test</td></tr> </table>> ]
	c2 [ label = <<table port="p"> <tr><td>Test</td></tr> </table>> ]
	c3 [ label = <<table port="p"> <tr><td>Test</td></tr> </table>> ]
	c1:p -> c2:p [ ]
	c1:p -> c3:p [ ]
	c1:p -> c3:p [ ]
	c2:p -> c3:p [ ]
}
---
Remove any of the edges and the graph works.

Backtrace of "dot":
---
(gdb) bt
#0  0x00007ffff7b90c4b in resolvePort () from /usr/lib/libgvc.so.6
#1  0x00007ffff7b81b56 in endpath () from /usr/lib/libgvc.so.6
#2  0x00007ffff239838a in ?? () from /usr/lib/graphviz/libgvplugin_dot_layout.so.6
#3  0x00007ffff238a4ed in ?? () from /usr/lib/graphviz/libgvplugin_dot_layout.so.6
#4  0x00007ffff238ab58 in dot_layout () from /usr/lib/graphviz/libgvplugin_dot_layout.so.6
#5  0x00007ffff7b5ae92 in gvLayoutJobs () from /usr/lib/libgvc.so.6
#6  0x00005555555550b0 in ?? ()
#7  0x00007ffff75671c1 in __libc_start_main (main=0x555555554e10, argc=2, argv=0x7fffffffe6c8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe6b8) at ../csu/libc-start.c:308
#8  0x000055555555514a in ?? ()
---

Using artful, and I already tried updating to bionic. It did not help.

There are number of bugs reported that sound similar. I hope this small
test case if helpful.

** Affects: graphviz (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1758970

Title:
  dot segfault in libgvc.so.6.0.0

Status in graphviz package in Ubuntu:
  New

Bug description:
  Dotty segfaults on many UMLgraph generated maps for me.

  Here is a trimmed down example:
  ---
  digraph "G" {
  	c1 [ label = <<table port="p"> <tr><td>Test</td></tr> </table>> ]
  	c2 [ label = <<table port="p"> <tr><td>Test</td></tr> </table>> ]
  	c3 [ label = <<table port="p"> <tr><td>Test</td></tr> </table>> ]
  	c1:p -> c2:p [ ]
  	c1:p -> c3:p [ ]
  	c1:p -> c3:p [ ]
  	c2:p -> c3:p [ ]
  }
  ---
  Remove any of the edges and the graph works.

  Backtrace of "dot":
  ---
  (gdb) bt
  #0  0x00007ffff7b90c4b in resolvePort () from /usr/lib/libgvc.so.6
  #1  0x00007ffff7b81b56 in endpath () from /usr/lib/libgvc.so.6
  #2  0x00007ffff239838a in ?? () from /usr/lib/graphviz/libgvplugin_dot_layout.so.6
  #3  0x00007ffff238a4ed in ?? () from /usr/lib/graphviz/libgvplugin_dot_layout.so.6
  #4  0x00007ffff238ab58 in dot_layout () from /usr/lib/graphviz/libgvplugin_dot_layout.so.6
  #5  0x00007ffff7b5ae92 in gvLayoutJobs () from /usr/lib/libgvc.so.6
  #6  0x00005555555550b0 in ?? ()
  #7  0x00007ffff75671c1 in __libc_start_main (main=0x555555554e10, argc=2, argv=0x7fffffffe6c8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe6b8) at ../csu/libc-start.c:308
  #8  0x000055555555514a in ?? ()
  ---

  Using artful, and I already tried updating to bionic. It did not help.

  There are number of bugs reported that sound similar. I hope this
  small test case if helpful.

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