Crash after placing footprint pad on a via and undoing

[Aleksandr Sh]

Steps to reproduce:
1. Download and open pcb file of attached project.
2. Update PCB from schematic.
3. Place J1 connector so that one of it's pads is on a via.
4. Ctrl-Z to undo everything.
5. Try to save the project or move a via.
6. Crash, pcb file is now empty.

Application: kicad
Version: (6.0.0-rc1-dev-484-g9b50b9406), release build
Libraries:
    wxWidgets 3.0.3
    libcurl/7.54.1 OpenSSL/1.0.2l zlib/1.2.11 libssh2/1.8.0 nghttp2/1.23.1 librtmp/2.3
Platform: Windows 8 (build 9200), 64-bit edition, 64 bit, Little endian, wxMSW
Build Info:
    wxWidgets: 3.0.3 (wchar_t,wx containers,compatible with 2.8)
    Boost: 1.60.0
    OpenCASCADE Community Edition: 6.8.0
    Curl: 7.54.1
    Compiler: GCC 7.1.0 with C++ ABI 1011

Build 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
    KICAD_USE_OCC=OFF
    KICAD_SPICE=ON

In newer nightlies "Update PCB from schematic" does not add footprints for some reason.

[Jeff Young (jeyjey)]

"pcb file is now empty"

A reproducible case of the disappearing tracks bug?

[Tomasz Wlostowski (twlostow)]

Hi Aleksandr,

I can't reproduce the error on my system, maybe I'm doing something wrong. Could you make a movie showing how to trigger it?

Thanks,
Tom

[Tomasz Wlostowski (twlostow)]

Ok, got it! In my case, only saving the project causes the crash and damaged board file. Working on a fix.