OK, crash dump is uploaded and is available here (removed in edit, since the issue is known) . It's not small (compressed down to 554M) so please only grab it if you need it, to spare me the bandwidth.
I'll be resetting my settings and being less adventurous with things that aren't menu-accessible, meanwhile.
EDIT: ok, yep. the issue is no longer present after resetting my cvars. Here's a unified diff (- is the crashing config, + is the noncrashing config). Some differences are totally unrelated I'm sure, just me not being consistent when going through the menu options.
$ diff -u1 Darkmod.cfg.old.sorted Darkmod.cfg.sorted
--- Darkmod.cfg.old.sorted 2022-08-09 21:52:14.271051900 -0400
+++ Darkmod.cfg.sorted 2022-08-09 22:00:21.361448700 -0400
@@ -5,3 +5,3 @@
seta com_maxFPS "240"
-seta com_numQuickSaves "2"
+seta com_numQuickSaves "4"
seta com_preloadDemos "0"
@@ -89,3 +89,3 @@
seta jobs_numThreads "16"
-seta logFile "2"
+seta logFile "1"
seta mod_validSkins "skins/characters/player/marine_mp;skins/characters/player/marine_mp_green;skins/characters/player/marine_mp_blue;skins/characters/player/marine_mp_red;skins/characters/player/marine_mp_yellow"
@@ -216,4 +216,4 @@
seta r_forceLoadImages "0"
-seta r_frameIndexMemory "8192"
-seta r_frameVertexMemory "8192"
+seta r_frameIndexMemory "4096"
+seta r_frameVertexMemory "4096"
seta r_frobDepthOffset "0.0005"
@@ -253,5 +253,5 @@
seta r_postprocess_sharpness "0.25"
-seta r_screenshot_format "jpg"
+seta r_screenshot_format "png"
seta r_shadowMapCullFront "0"
-seta r_shadowMapSinglePass "2"
+seta r_shadowMapSinglePass "0"
seta r_shadowMapSize "1024"
@@ -275,4 +275,4 @@
seta r_tonemap "1"
-seta r_useAnonreclaimer "1"
-seta r_useBindlessTextures "1"
+seta r_useAnonreclaimer "0"
+seta r_useBindlessTextures "0"
seta r_useFenceSync "1"
@@ -374,3 +374,3 @@
seta tdm_default_relations_def "atdm:team_relations_default"
-seta tdm_door_auto_open_on_unlock "1"
+seta tdm_door_auto_open_on_unlock "0"
seta tdm_door_control "0"
@@ -403,3 +403,3 @@
seta tdm_force_savegame_load "0"
-seta tdm_frobhelper_active "0"
+seta tdm_frobhelper_active "1"
seta tdm_frobhelper_alpha "1.0"
@@ -425,3 +425,3 @@
seta tdm_lg_weak "0"
-seta tdm_lod_bias "2.0"
+seta tdm_lod_bias "3.0"
seta tdm_lp_autopick_attempts "3"
@@ -431,3 +431,3 @@
seta tdm_lp_pawlow "0"
-seta tdm_lp_pick_timeout "500"
+seta tdm_lp_pick_timeout "400"
seta tdm_lp_randomize "1"
Autocommands now only contains r_finish.