fc4 problem with trace

[Paul Kienzle]

The version of gcc I'm using is the latest update from FC4

address@hidden miscellaneous]$ yum info gcc
Setting up repositories
Reading repository metadata in from local files
Installed Packages
Name   : gcc
Arch   : i386
Version: 4.0.1
Release: 4.fc4
Size   : 5.0 M
Repo   : installed
Summary: The GNU cc and gcc C compilers.

Description:
 The gcc package includes the cc and gcc GNU compilers for compiling C code.


I find there is some flakiness with this box, such as errors from the C
compiler being replaced by \hat a, and \hat a showing up on some man pages.


I have a trace of the code prior to the segfault if that helps.

- Paul


272         if (ok) switch (command[3]) {
309             if (debug) 
331             octave_value_list evalargs;
332             evalargs(1) = "senderror(lasterr);";
93        octave_value& operator () (int n) { return elem (n); }
283           if (rep != a.rep)
285               if (--rep->count == 0)
288               rep = a.rep;
289               rep->count++;
332             evalargs(1) = "senderror(lasterr);";
333             evalargs(0) = context;
93        octave_value& operator () (int n) { return elem (n); }
283           if (rep != a.rep)
285               if (--rep->count == 0)
286                 delete rep;
288               rep = a.rep;
289               rep->count++;
333             evalargs(0) = context;
450             static pool_type _S_pool;
334             octave_value_list fret = feval("eval",evalargs,0);
450             static pool_type _S_pool;
278           { return &((reinterpret_cast<_Rep*> (_M_data()))[-1]); }
225               if (__builtin_expect(this != &_S_empty_rep(), false))
227                 if (__gnu_cxx::__exchange_and_add(&this->_M_refcount, -1) 
<= 0)
228                   _M_destroy(__a);
338             STATUS("done command");
59        ~string_vector (void) { }
450             static pool_type _S_pool;
273           { std::_Destroy(this->_M_impl._M_start, this->_M_impl._M_finish,
109           { _M_deallocate(this->_M_impl._M_start, 
this->_M_impl._M_end_of_storage
122             if (__p)
59        ~string_vector (void) { }
450             static pool_type _S_pool;
273           { std::_Destroy(this->_M_impl._M_start, this->_M_impl._M_finish,
109           { _M_deallocate(this->_M_impl._M_start, 
this->_M_impl._M_end_of_storage
122             if (__p)
123               _M_impl.deallocate(__p, __n);

Program received signal SIGSEGV, Segmentation fault.
0x00925e3b in __gnu_cxx::__pool<true>::_M_reclaim_block () from 
/usr/lib/libstdc++.so.6
(gdb) bt
#0  0x00925e3b in __gnu_cxx::__pool<true>::_M_reclaim_block () from 
/usr/lib/libstdc++.so.6
#1  0x00b07b2f in __gnu_cxx::__mt_alloc<octave_value, 
__gnu_cxx::__common_pool_policy<__gnu_cxx::__pool, true> >::deallocate (
    this=0xbf8cfe44, __p=0x919f538, __n=16) at 
/usr/lib/gcc/i386-redhat-linux/4.0.1/../../../../include/c++/4.0.1/ext/mt_allocator.h:746
#2  0x00b05083 in process_commands (channel=8)
    at 
/usr/lib/gcc/i386-redhat-linux/4.0.1/../../../../include/c++/4.0.1/bits/stl_vector.h:123
#3  0x00b06aa7 in Flisten (address@hidden) at listen.cc:707
#4  0x00f57e14 in octave_builtin::do_multi_index_op (this=0x90ba220, nargout=0, 
address@hidden) at ov-builtin.cc:124
#5  0x00f589e2 in octave_builtin::subsref (this=0x90ba220, address@hidden, 
address@hidden, nargout=0) at ov-builtin.cc:72
#6  0x00f3baaa in octave_value::subsref (this=0xbf8d02b8, address@hidden, 
address@hidden, nargout=0) at ov.cc:837
#7  0x01029399 in tree_index_expression::rvalue (this=0x91a6a38, nargout=0) at 
pt-idx.cc:352
#8  0x0104fae4 in tree_statement::eval (this=0x91b0bc0, silent=false, 
nargout=0, in_function_body=false) at pt-stmt.cc:137
#9  0x01050512 in tree_statement_list::eval (this=0x91a6ad8, silent=false, 
nargout=0) at pt-stmt.cc:172
#10 0x00eae3f4 in main_loop (address@hidden) at toplev.cc:165
#11 0x011d0a04 in octave_main (argc=1, argv=0xbf8d06c4, embedded=0) at 
octave.cc:622
#12 0x08048621 in main (argc=1, argv=0xbf8d06c4) at main.c:36

(gdb) up
#1  0x00b07b2f in __gnu_cxx::__mt_alloc<octave_value, 
__gnu_cxx::__common_pool_policy<__gnu_cxx::__pool, true> >::deallocate (
    this=0xbf8cfe44, __p=0x919f538, __n=16) at 
/usr/lib/gcc/i386-redhat-linux/4.0.1/../../../../include/c++/4.0.1/ext/mt_allocator.h:746
746                 __pool._M_reclaim_block(reinterpret_cast<char*>(__p), 
__bytes);
(gdb) p __p
$4 = (octave_value *) 0x919f538

(gdb) up
#2  0x00b05083 in process_commands (channel=8)
    at 
/usr/lib/gcc/i386-redhat-linux/4.0.1/../../../../include/c++/4.0.1/bits/stl_vector.h:123
123               _M_impl.deallocate(__p, __n);

(gdb) p fret
$1 = {static allocator = {head = 0x0, grow_size = 256, item_size = 32}, 
  data = {<std::_Vector_base<octave_value,std::allocator<octave_value> >> = {
      _M_impl = {<std::allocator<octave_value>> = 
{<__gnu_cxx::__mt_alloc<octave_value,__gnu_cxx::__common_pool_policy<__gnu_cxx::__pool,
 true> >> = {<__gnu_cxx::__mt_alloc_base<octave_value>> = {<No data fields>}, 
<No data fields>}, <No data fields>}, _M_start = 0x0, 
        _M_finish = 0x0, _M_end_of_storage = 0x0}}, <No data fields>}, 
  names = {<Array<std::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >> = {_vptr.Array = 0x1308c00, rep = 0x877e2a8, 
      dimensions = {rep = 0x877e2b8}, idx = 0x0, idx_count = 0}, <No data 
fields>}}

gdb) p evalargs
$2 = {static allocator = {head = 0x0, grow_size = 256, item_size = 32}, 
  data = {<std::_Vector_base<octave_value,std::allocator<octave_value> >> = {
      _M_impl = {<std::allocator<octave_value>> = 
{<__gnu_cxx::__mt_alloc<octave_value,__gnu_cxx::__common_pool_policy<__gnu_cxx::__pool,
 true> >> = {<__gnu_cxx::__mt_alloc_base<octave_value>> = {<No data fields>}, 
<No data fields>}, <No data fields>}, _M_start = 0x919f538, 
        _M_finish = 0x919f548, _M_end_of_storage = 0x919f548}}, <No data 
fields>}, 
  names = {<Array<std::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >> = {_vptr.Array = 0x1308c00, rep = 0x91a6ae8, 
      dimensions = {rep = 0x91a6ac8}, idx = 0x0, idx_count = 0}, <No data 
fields>}}