segfault when dragging a PCB trace in OpenGL or Canvas mode

This issue doesn't happen in current nightly builds.

Maybe try to build a debu build with -DCMAKE_BUILD_TYPE=Debug and get a new backtrace.

This might be related to
[Kicad-developers] [PATCH] Fix crash when switching from dragging to routine (PNS router)
https://lists.launchpad.net/kicad-developers/msg28510.html

Hello,

I found the line of code which is responsible for the segfault. With the attached patch, KiCad doesn't crash any more and dragging works. However, the GUI looks a bit funny because the selection is not cleared.

It is not a real bug-fix, but it is a starting point.

When the line router_tool.cpp:798 m_toolMgr->RunAction( COMMON_ACTIONS::selectionClear, true ); in ROUTER_TOOL::InlineDrag() is commented out, there is no segfault any more.

When m_toolMgr->RunAction( COMMON_ACTIONS::selectionClear, true ); is executed, the program continues to tool_manager.cpp:551 in TOOL_MANAGER::dispatchInternal() and crashes at line st->cofunc->Call( aEvent ); before the corresponding event function selection_tool.cpp:753 SELECTION_TOOL::clearSelection() is executed.

To me, it seams that the problem is that InlineDrag() is already a coroutine which starts a new coroutine. However, because on other systems KiCad does not crash, it could have to do something with different boost versions. Looking at coroutine.h, many things there compiled depending on the boost version.

What I did to find the line:

1.

Program received signal SIGSEGV, Segmentation fault.
0x00005555571885e0 in ?? ()
(gdb) list
165 * MacOSX requires it for file association.
166 * @see http://wiki.wxwidgets.org/WxMac-specific_topics
167 */
168 void MacOpenFile( const wxString& aFileName ) // overload wxApp virtual
169 {
170 Pgm().MacOpenFile( aFileName );
171 }
172 };
173
174 IMPLEMENT_APP( APP_SINGLE_TOP );
(gdb) bt
#0 0x00005555571885e0 in ?? ()
#1 0x00007fffe0dec5c2 in operator() (__args#0=..., this=0x5555571c3d40) at /usr/include/c++/4.9/functional:2439
#2 COROUTINE<int, TOOL_EVENT const&>::callerStub (aData=93825022049600) at /home/hannes/kicad/kicad-4.0.5+dfsg1/include/tool/coroutine.h:271
#3 0x00007ffff59aa75e in make_fcontext () from /usr/lib/x86_64-linux-gnu/libboost_context.so.1.55.0
#4 0x0000000000000000 in ?? ()

2.

(gdb) br /home/hannes/kicad/kicad-4.0.5+dfsg1/include/tool/coroutine.h:271
Breakpoint 1 at 0x7fffe0dec5b9: file /home/hannes/kicad/kicad-4.0.5+dfsg1/include/tool/coroutine.h, line 271.
(gdb) c
Continuing.
[Thread 0x7fffcd652700 (LWP 14757) exited]

Breakpoint 1, COROUTINE<int, TOOL_EVENT const&>::callerStub (aData=93825019588768)
    at /home/hannes/kicad/kicad-4.0.5+dfsg1/include/tool/coroutine.h:271
271 cor->m_retVal = cor->m_func( *( cor->m_args ) );
(gdb) c
Continuing.

Breakpoint 1, COROUTINE<int, TOOL_EVENT const&>::callerStub (aData=93825019291056)
    at /home/hannes/kicad/kicad-4.0.5+dfsg1/include/tool/coroutine.h:271
271 cor->m_retVal = cor->m_func( *( cor->m_args ) );
(gdb) c
Continuing.

Breakpoint 1, COROUTINE<int, TOOL_EVENT const&>::callerStub (aData=93825011058528)
    at /home/hannes/kicad/kicad-4.0.5+dfsg1/include/tool/coroutine.h:271
271 cor->m_retVal = cor->m_func( *( cor->m_args ) );
(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x0000555556f1d920 in ?? ()

3.

COROUTINE<int, TOOL_EVENT const&> is used in common/tool/tool_manager.cpp:545
Add:
tool_manager.cpp:551
std::cout << aEvent.Format() << std::endl;

4.

Out...

This test file contain 3 segments of tracks.
If try to drag (key D) middle track then pcbnew crash.
It is true for a real board with nets too.

Application: pcbnew
Version: no-vcs-found-feba091~58~ubuntu16.10.1, release build
Libraries: wxWidgets 3.0.2
           libcurl/7.50.1 OpenSSL/1.0.2g zlib/1.2.8 libidn/1.33 librtmp/2.3
Platform: Linux 4.8.0-41-generic x86_64, 64 bit, Little endian, wxGTK
- Build Info -
wxWidgets: 3.0.2 (wchar_t,wx containers,compatible with 2.8)
Boost: 1.61.0
Curl: 7.50.1
KiCad - Compiler: GCC 6.2.0 with C++ ABI 1010
        Settings: USE_WX_GRAPHICS_CONTEXT=OFF
                  USE_WX_OVERLAY=OFF
                  KICAD_SCRIPTING=ON
                  KICAD_SCRIPTING_MODULES=ON
                  KICAD_SCRIPTING_WXPYTHON=ON
                  KICAD_SCRIPTING_ACTION_MENU=ON
                  BUILD_GITHUB_PLUGIN=ON
                  KICAD_USE_OCE=ON

Hello,

Thanks for the fix! I tested 4.0.7 and it works!

Regards,
Hannes