Comment 5 for bug 1837766

Here's another trace, I think it's the same bug. I didn't drag a via, but it was shoved when there wasn't enough space.

Thread 1 "kicad" received signal SIGSEGV, Segmentation fault.
0x000000690000006d in ?? ()
(gdb) bt
#0 0x000000690000006d in ()
#1 0x00007fffb05a60f2 in PNS::LINE::LINE(PNS::VIA const&) (aVia=..., this=0x55555b271780)
    at /home/ondra/packages/kicad-git/src/kicad-git/pcbnew/router/pns_shove.cpp:1367
#2 0x00007fffb05a60f2 in PNS::SHOVE::ShoveDraggingVia(PNS::VIA*, VECTOR2<int> const&, PNS::VIA**) (this=
    0x55556889ada0, aVia=<optimized out>, aWhere=..., aNewVia=aNewVia@entry=0x55555b271b40)
    at /home/ondra/packages/kicad-git/src/kicad-git/pcbnew/router/pns_shove.cpp:1338
#3 0x00007fffb0561896 in PNS::DRAGGER::dragShove(VECTOR2<int> const&) (this=0x555567bd4800, aP=...)
    at /home/ondra/packages/kicad-git/src/kicad-git/pcbnew/router/pns_dragger.cpp:295
#4 0x00007fffb051f977 in PNS::ROUTER::moveDragging(VECTOR2<int> const&, PNS::ITEM*) (this=0x555568b73cf0, aP=..., aEndItem=<optimized out>)
    at /usr/include/c++/9.1.0/bits/unique_ptr.h:357
#5 0x00007fffb052c8d0 in ROUTER_TOOL::performDragging(int) (this=<optimized out>, aMode=<optimized out>)
    at /home/ondra/packages/kicad-git/src/kicad-git/pcbnew/router/router_tool.cpp:1021
#6 0x00007fffb052fd37 in ROUTER_TOOL::MainLoop(TOOL_EVENT const&) (this=<optimized out>, aEvent=...)
    at /home/ondra/packages/kicad-git/src/kicad-git/pcbnew/router/router_tool.cpp:948
#7 0x00007fffb0743680 in std::function<int (TOOL_EVENT const&)>::operator()(TOOL_EVENT const&) const (__args#0=..., this=0x5555631f2f68)
    at /usr/include/c++/9.1.0/bits/std_function.h:685
#8 0x00007fffb0743680 in COROUTINE<int, TOOL_EVENT const&>::callerStub(long) (aData=<optimized out>)
    at /home/ondra/packages/kicad-git/src/kicad-git/include/tool/coroutine.h:335
#9 0x00005555556d2a41 in make_fcontext ()