Bus error on FreeBSD (clang 18.1.6)

[180watt]

When building and trying to run on FreeBSD-current (15) with clang 18.1.6, I get a Bus error (core dumped) after playing for a few minutes. Looking at a backtrace from gdb, it seems to come from D3DXVec4Normalize. Below is the whole backtrace.

#0  0x000000080124fe05 in D3DXVec4Normalize () from bin//libtogl.so
#1  0x0000000812ddea01 in CShaderAPIDx8::CommitFastClipPlane() () from /home/seafork/wrk/source-engine/install/bin/libshaderapidx9.so
#2  0x0000000812ddaf6f in CShaderAPIDx8::CommitStateChanges() () from /home/seafork/wrk/source-engine/install/bin/libshaderapidx9.so
#3  0x0000000812ddaf25 in CShaderAPIDx8::DrawMesh(CMeshBase*) () from /home/seafork/wrk/source-engine/install/bin/libshaderapidx9.so
#4  0x000000080ea6c9cd in DispInfo_DrawPrimLists(ERenderDepthMode) () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#5  0x000000080ea6f15a in DispInfo_RenderList(int, msurface2_t**, int, bool, unsigned long, ERenderDepthMode) () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#6  0x000000080ea7b6b0 in Shader_DrawDispChain(int, CMSurfaceSortList const&, unsigned long, ERenderDepthMode) () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#7  0x000000080ea7f664 in R_DrawWorldLists(IWorldRenderList*, unsigned long, float) () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#8  0x000000082c3d9112 in CBaseWorldView::DrawExecute(float, view_id_t, float) () from /home/seafork/wrk/source-engine/install/hl2/bin/libclient.so
#9  0x000000082c3d9e77 in CAboveWaterView::CReflectionView::Draw() () from /home/seafork/wrk/source-engine/install/hl2/bin/libclient.so
#10 0x000000082c3d9aea in CAboveWaterView::Draw() () from /home/seafork/wrk/source-engine/install/hl2/bin/libclient.so
#11 0x000000082c3d12bb in CViewRender::DrawWorldAndEntities(bool, CViewSetup const&, int, ViewCustomVisibility_t*) () from /home/seafork/wrk/source-engine/install/hl2/bin/libclient.so
#12 0x000000082c3d07af in CViewRender::ViewDrawScene(bool, SkyboxVisibility_t, CViewSetup const&, int, view_id_t, bool, int, ViewCustomVisibility_t*) () from /home/seafork/wrk/source-engine/install/hl2/bin/libclient.so
#13 0x000000082c3d2479 in CViewRender::RenderView(CViewSetup const&, int, int) () from /home/seafork/wrk/source-engine/install/hl2/bin/libclient.so
#14 0x000000082c3ba8c5 in CViewRender::Render(vrect_t*) () from /home/seafork/wrk/source-engine/install/hl2/bin/libclient.so
#15 0x000000082c276920 in CHLClient::View_Render(vrect_t*) () from /home/seafork/wrk/source-engine/install/hl2/bin/libclient.so
#16 0x000000080ebe0fe2 in V_RenderView() () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#17 0x000000080ec5ba5f in SCR_UpdateScreen() () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#18 0x000000080eb4e80c in _Host_RunFrame_Render() () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#19 0x000000080eb4f883 in _Host_RunFrame(float) () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#20 0x000000080eb5d97d in CHostState::State_Run(float) () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#21 0x000000080eb5cdf4 in CHostState::FrameUpdate(float) () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#22 0x000000080ebb8f41 in CEngine::Frame() () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#23 0x000000080ebb5e01 in CEngineAPI::MainLoop() () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#24 0x000000080ebb6b64 in CModAppSystemGroup::Main() () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#25 0x000000080ee376e5 in CAppSystemGroup::Run() () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#26 0x000000080ebb61c8 in CEngineAPI::RunListenServer() () from /home/seafork/wrk/source-engine/install/bin/libengine.so
#27 0x00000008008d05e5 in CAppSystemGroup::Run() () from bin/liblauncher.so
#28 0x00000008008d05e5 in CAppSystemGroup::Run() () from bin/liblauncher.so
#29 0x00000008008af246 in LauncherMain () from bin/liblauncher.so
#30 0x0000000000201e38 in main ()

I am also able to get this to happen with clang version 15.0.7