Custom systems segfault when you attempt to view them in the map

[a-random-lemurian]

Observed behaviour

Expected behaviour

I see the custom system in the view and I can spawn in it.

Steps to reproduce

1. Put this system file in data/systems/custom: segfault-star.json
2. Open Pioneer
3. Ctrl+click new game
4. (Try to) go to the coordinates 5, 5, 0 in the location menu
5. Observe the segfault

My pioneer version (and OS):
Git commit d5e3147
Xubuntu 24.04

My output.txt (required) and game save (optional, but recommended)
output.txt

[impaktor]

OK, so the crash is with a mod. Looks like pretty much every characteristic of that system has divide by zero?

Thread 1 "pioneer" received signal SIGSEGV, Segmentation fault.
0x00005555557cd3d0 in SectorMap::DrawNearSector (this=this@entry=0x555561934290, sx=5, sy=5, sz=0, trans=...) at /home/karlf/usr/src/pioneer/src/SectorMap.cpp:1027
1027			systrans.Scale((StarSystem::starScale[(*i).GetStarType(0)]));
(gdb) bt
#0  0x00005555557cd3d0 in SectorMap::DrawNearSector (this=this@entry=0x555561934290, sx=5, sy=5, sz=0, trans=...) at /home/karlf/usr/src/pioneer/src/SectorMap.cpp:1027
#1  0x00005555557cdb07 in SectorMap::DrawNearSectors (this=this@entry=0x555561934290, modelview=...) at /home/karlf/usr/src/pioneer/src/SectorMap.cpp:918
#2  0x00005555557cf322 in SectorMap::Draw3D (this=0x555561934290) at /home/karlf/usr/src/pioneer/src/SectorMap.cpp:614
#3  0x000055555562dd17 in SectorView::Draw3D (this=0x5555580140d0) at /usr/include/c++/14.1.1/bits/unique_ptr.h:193
#4  0x000055555561ad7a in GameLoop::Update (this=0x555555be3210, deltaTime=0.0170269571) at /home/karlf/usr/src/pioneer/src/Pi.cpp:1011
#5  0x00005555555ed4ef in Application::Run (this=0x555555be2fb0) at /home/karlf/usr/src/pioneer/src/core/Application.cpp:193
#6  0x00005555555e6504 in main (argc=<optimized out>, argv=<optimized out>) at /home/karlf/usr/src/pioneer/src/Pi.h:144

Where did you get this system from?

    "bodies": [
	{
	    "agricultural": "f0/0",
	    "argOfPeriapsis": "f0/0",
	    "aspectRatio": "f1/0",
	    "atmosColor": [
		0,
		0,
		0,
		255
	    ],
	    "atmosDensity": "f0/0",
	    "atmosOxidizing": "f0/0",
	    "averageTemp": 6908,
	    "axialTilt": "f0/0",
	    "eccentricity": "f0/0",
	    "hasRings": false,
	    "humanActivity": "f0/0",
	    "inclination": "f0/0",
	    "life": "f0/0",
	    "mass": "f0/0",
	    "metallicity": "f0/0",
	    "name": "Coredump",
	    "orbitalOffset": "f0/0",
	    "orbitalPhase": "f0/0",
	    "population": "f0/0",
	    "radius": "f0/0",
	    "rotationPeriod": "f0/0",
	    "rotationPhase": "f0/0",
	    "seed": 2,
	    "semiMajorAxis": "f0/0",
	    "type": "STAR_G",
	    "volatileIces": "f0/0",
	    "volatileLiquid": "f0/0",
	    "volcanicity": "f0/0"
	}
    ]

[zonkmachine]

Warning: Caught error in Lua UI code:
	[T] pigui/views/map-sector-view.lua:224: bad argument #1 to 'text' (string expected, got nil)

Thread 1 "pioneer" received signal SIGSEGV, Segmentation fault.
0x0000555555981ab2 in ImDrawList::_CalcCircleAutoSegmentCount (this=0x55555b316700, radius=2.1545943e+09) at /home/zonkmachine/builds/pioneer/contrib/imgui/imgui_draw.cpp:572
572	        return _Data->CircleSegmentCounts[radius_idx]; // Use cached value
(gdb) bt full
#0  0x0000555555981ab2 in ImDrawList::_CalcCircleAutoSegmentCount (this=0x55555b316700, radius=2.1545943e+09) at /home/zonkmachine/builds/pioneer/contrib/imgui/imgui_draw.cpp:572
        radius_idx = -2147483648
#1  0x0000555555983a5a in ImDrawList::_PathArcToFastEx (this=0x55555b316700, center=..., radius=2.1545943e+09, a_min_sample=a_min_sample@entry=0, a_max_sample=a_max_sample@entry=48, a_step=a_step@entry=0)
    at /home/zonkmachine/builds/pioneer/contrib/imgui/imgui_draw.cpp:1066
        sample_range = <optimized out>
        a_next_step = <optimized out>
        samples = <optimized out>
        extra_max_sample = <optimized out>
        out_ptr = <optimized out>
        sample_index = <optimized out>
#2  0x0000555555986857 in ImDrawList::AddCircleFilled (num_segments=0, col=2147483647, radius=<optimized out>, center=..., this=0x55555b316700)
    at /home/zonkmachine/builds/pioneer/contrib/imgui/imgui_draw.cpp:1515
No locals.
#3  ImDrawList::AddCircleFilled (this=this@entry=0x55555b316700, center=..., radius=<optimized out>, col=2147483647, num_segments=num_segments@entry=0)
    at /home/zonkmachine/builds/pioneer/contrib/imgui/imgui_draw.cpp:1507
        a_max = <optimized out>
#4  0x00005555557c0f56 in SectorMap::StarLabel::Draw (this=0x55556c15b860, dl=..., hovered=<optimized out>) at /home/zonkmachine/builds/pioneer/src/SectorMap.cpp:146
        box = <optimized out>
        font = <optimized out>
#5  0x00005555557b8485 in SectorMap::DrawLabelsInternal (this=0x555556eabe00, interactive=<optimized out>, imagePos=...) at /home/zonkmachine/builds/pioneer/src/SectorMap.cpp:779
        hovered = @0x55556c15b860: {_vptr.Label = 0x555555b0cdc8 <vtable for SectorMap::StarLabel+16>, pos = {x = 639.999939, y = 359.999939, z = -0.0357779004}, color = 4291611852, host = @0x555556eac118}
        NOT_FOUND = <optimized out>
        hovered_i = 0
        drawData = {Valid = false, CmdListsCount = 1135968256, TotalIdxCount = 1432398800, TotalVtxCount = 21845, CmdLists = {Size = 1818829472, Capacity = 21845, 
    Data = 0x5555556d8870 <PiGui::Instance::NewFrame()+944>}, DisplayPos = {x = 2.77916261e+13, y = 3.0611365e-41}, DisplaySize = {x = 1.54392834e+13, y = 3.0611365e-41}, FramebufferScale = {x = 2.04011909e+17, y = 3.0611365e-41}, 
          OwnerViewport = 0x555555bcf7e0}
        dl = <optimized out>
#6  0x0000555555614cf3 in SectorView::DrawPiGui (this=<optimized out>) at /home/zonkmachine/builds/pioneer/src/SectorView.cpp:280
No locals.
#7  0x0000555555607fc2 in GameLoop::Update (this=0x555555bcf7e0, deltaTime=0.0166593846) at /home/zonkmachine/builds/pioneer/src/Pi.cpp:1039
        step = <optimized out>

[zonkmachine]

Where did you get this system from?

I have a system like that and it's the .json version of sol00 created with the system editor. If I remove it I still get the segfault.

#0  0x0000555555981ab2 in ImDrawList::_CalcCircleAutoSegmentCount (this=0x55555c6efaf0, radius=2.21812864e+09) at /home/zonkmachine/builds/pioneer/contrib/imgui/imgui_draw.cpp:572
        radius_idx = -2147483648

[impaktor]

@Web-eWorks any clue what's going on here?

[sturnclaw]

Hmm... not off the top of my head, I'll have to take a look at it during the day sometime and dig into the crash. I did notice some weird behavior when I was loading a moderately complicated custom system I created on my own, but never got a chance to find the culprit (and it was having issues in mission Lua code, besides).

[a-random-lemurian]

I remember just git cloning Pioneer and running cmake... is there a way to check for mods and remove them? I don't remember having any.

Also, I generated that with the system editor.

[impaktor]

@a-random-lemurian The json system you provided is a mod, so you've made it or someone else, it's not in master.
Mods must be manually downloaded and installed from somewhere (usually a forum somewhere)

[a-random-lemurian]

@a-random-lemurian The json system you provided is a mod, so you've made it or someone else, it's not in master. Mods must be manually downloaded and installed from somewhere (usually a forum somewhere)

So how do I check mods, if any, and remove them?

[sturnclaw]

@a-random-lemurian how did you get the position of the star within the sector to be a negative value? It's not responsible for the crash, but the UI shouldn't let you do that directly.

The crash is a simple one - the system editor wasn't generating a needed piece of metadata (a list of stars in the system), and as a result the game thought the system had no stars. I've included some fixes to those conditions in an upcoming PR, so it should be a bit safer to run the game with a custom system that has no stars.

[sturnclaw]

Specifically, the value of -11.568 should be impossible:

EDIT: ah, that would be because it's an uninitialized variable by default.

[sturnclaw]

The issue should be fixed once the linked PR is merged. You'll need to load and re-save the system file for the fix to take effect.