Fabian Fagerholm wrote:
Anthony, any chance you could try the following things:
* Could you compile the attached file (g++ -g -o test test.cpp)
and run it under gdb? If it crashes in the same way, we have a
smaller test case to work with.
The program does not crash.
* Could you apply the attached patch to src/gtkmm/dockdialog.cpp,
recompile and provide the output? Or put a gdb breakpoint at
dockdialog.cpp:506 and then print the value of str and
separator?
Breakpoint 1, studio::DockDialog::set_contents (this=0xfe2320,
z=<value optimized out>) at dockdialog.cpp:506
506
book_contents=String(str.begin(),str.begin()+separator);
(gdb) p str
$3 = {static npos = 18446744073709551615,
_M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>},
_M_p = 0xfee418 "navigator - info pal_edit pal_browse - tool_options history canvases - layers groups"}}
(gdb) p separator
$4 = 10
However, it appears that line is run several times.
1. 1: str = {static npos = 18446744073709551615,
_M_dataplus = {<std::allocator<char>> =
{<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data
fields>},
_M_p = 0xfee418 "navigator - info pal_edit pal_browse -
tool_options history canvases - layers groups"}}
(gdb) display separator
2: separator = 10
2. 2: separator = 26
1: str = {static npos = 18446744073709551615,
_M_dataplus = {<std::allocator<char>> =
{<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data
fields>},
_M_p = 0xfee548 " info pal_edit pal_browse - tool_options
history canvases - layers groups"}}
3. 2: separator = 31
1: str = {static npos = 18446744073709551615,
_M_dataplus = {<std::allocator<char>> =
{<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data
fields>},
_M_p = 0xff8218 " tool_options history canvases - layers groups"}}
4. 2: separator = 4294967295
1: str = {static npos = 18446744073709551615,
_M_dataplus = {<std::allocator<char>> =
{<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data
fields>}, _M_p = 0xff2b28 " layers groups"}}
The crash is, of course, after #4.
Looking at the code, on line 483 and 485, is unsigned int really right?
Note that on amd64, sizeof(int) is 4 and sizeof(ptrdiff_t) is 8...
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