[Boost-bugs] [Boost C++ Libraries] #5251: boost graph seg faults inside gdb

Subject: [Boost-bugs] [Boost C++ Libraries] #5251: boost graph seg faults inside gdb
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-03-01 15:23:43

#5251: boost graph seg faults inside gdb
-------------------------------+--------------------------------------------
 Reporter:  joao@…             |       Owner:  asutton
     Type:  Bugs               |      Status:  new    
Milestone:  To Be Determined   |   Component:  graph  
  Version:  Boost 1.42.0       |    Severity:  Problem
 Keywords:  graph num_edges    |  
-------------------------------+--------------------------------------------
 I have a class with a boost graph member variable in it.

 When I call a method from within gdb, to get the number of edges of a
 graph, I get a segmentation fault.

 I'm attaching a standalone code that reproduces it:
 1. Enter GDB
 2. Set a breakpoint on line number 34
 3. From within GDB execute the following:
    (a) p wrapper.dummy_.nedges()
    (b) p dummy.nedges()

 3a is fine, prints out 0 as it should be. The graph is empty.

 3b seg faults though...

 This is the resulting call stack:

 #0  0x08049b90 in std::_List_const_iterator<boost::list_edge<void*,
 boost::property<boost::edge_bundle_t, int, boost::no_property> >
 >::operator++ (this=0xbffff6fc) at
 /usr/include/c++/4.4/bits/stl_list.h:223

 #1  0x08049427 in
 std::__distance<std::_List_const_iterator<boost::list_edge<void*,
 boost::property<boost::edge_bundle_t, int, boost::no_property> > > >
 (__first=..., __last=...) at
 /usr/include/c++/4.4/bits/stl_iterator_base_funcs.h:79

 #2  0x08048ea3 in
 std::distance<std::_List_const_iterator<boost::list_edge<void*,
 boost::property<boost::edge_bundle_t, int, boost::no_property> > > >
 (__first=..., __last=...) at
 /usr/include/c++/4.4/bits/stl_iterator_base_funcs.h:114

 #3  0x08048c12 in std::list<boost::list_edge<void*,
 boost::property<boost::edge_bundle_t, int, boost::no_property> >,
 std::allocator<boost::list_edge<void*,
 boost::property<boost::edge_bundle_t, int, boost::no_property> > > >::size
 (this=0xbffff7c4) at /usr/include/c++/4.4/bits/stl_list.h:805

 #4  0x08048a3a in
 boost::num_edges<boost::detail::adj_list_gen<boost::adjacency_list<boost::listS,
 boost::listS, boost::undirectedS, int, int, boost::no_property,
 boost::listS>, boost::listS, boost::listS, boost::undirectedS,
 boost::property<boost::vertex_bundle_t, int, boost::no_property>,
 boost::property<boost::edge_bundle_t, int, boost::no_property>,
 boost::no_property, boost::listS>::config> (g_=...) at
 /usr/include/boost/graph/detail/adjacency_list.hpp:978

 #5  0x08048865 in dummy_class::nedges (this=0xbffff7c4) at graph.cxx:17

 #6  <function called from gdb>

 #7  dummy_method () at graph.cxx:34

 #8  0x080488ea in main (argc=3, argv=0xbffff914) at graph.cxx:43

 This is preventing us from using the graph reliably.

 Using Ubuntu 10.10 with Boost 1.42.0 and G++ 4.4.4.

 Reproduceable on Ubuntu 9.10 as well.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5251>
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