After modifying the inv_shared.h thusly:

>49,51c49,51
>< #define MAX_WEAPONS_PER_OBJDEF 6
>< #define MAX_AMMOS_PER_OBJDEF 6
>< #define MAX_FIREDEFS_PER_WEAPON 12
>---
>> #define MAX_WEAPONS_PER_OBJDEF 4
>> #define MAX_AMMOS_PER_OBJDEF 4
>> #define MAX_FIREDEFS_PER_WEAPON 8

Recompiling the ufo file on Linux. Running the game with my mod, which introduced a 5th grenade type to the grenade launcher and a 5th laser type to DF Cartriage. But only the 5th grenade type was in use, the game segfaulted the first time I went into the Battlescape the game crashed with the following error message. Geever suggested that I post it as a bug, because moders would likely try stuff like this in the future.

> XML Written to buffer (197960 Bytes)
> setting game random seed to 47292
> ------- Loading game.so -------
> not found at '/usr/local/lib/'
> not found at '/home/ubuntu/.ufoai/2.6-dev/techmods'
> not found at './mods/techmods'
> not found at '/home/ubuntu/.ufoai/2.6-dev/base'
> found at './base'
> [New Thread 0x7fffe2975700 (LWP 2673)]
> SV_ParseAssembly: warning - cvar 'rm_drop' value doesn't seem to be a valid tile id '' - set to default '+craft_drop_firebird'
> SV_ParseAssembly: warning - cvar 'rm_ufo' value doesn't seem to be a valid tile id '' - set to default '+craft_ufo_corrupter'
> tiles: -village/vil_ +bungalow2 +start +street_h_03 +nature_11
> pos: -16 -16 0 -16 16 0 -16 8 0 -8 16 0
> tiles: 4
> CM_LoadMap: "-village/vil_ +bungalow2 +start +street_h_03 +nature_11" "-16 -16 0 -16 16 0 -16 8 0 -8 16 0"
> Rerouted 267 cols for RMA in 1.0s
> checksum for the map '+village': 1905929828
> ufo script checksum 3508952868
> -------------------------------------
> Connecting to localhost...
> ==== InitGame ====
> Spawned ai player for team 0 with entnum 37 (a c)
> Spawned ai player for team 0 with entnum 38 (a c)
> Spawned ai player for team 0 with entnum 39 (a c)
> Spawned ai player for team 0 with entnum 40 (a c)
> Created AI player (team 0)
> Could not find the equipment with the id: 'alien_workers1'
> Spawned ai player for team 7 with entnum 41 (Muurgh Uk Ohm Umhpf)
> Spawned ai player for team 7 with entnum 42 (Uoghr Ur Uor Umhfm)
> Spawned ai player for team 7 with entnum 43 (Muorgh Uz Oor Ruogh)
> Spawned ai player for team 7 with entnum 44 (Oorgh Ws Our Hfmzs)
> Created AI player (team 7)
> Used inventory slots after ai spawn: 0
> connection attempt from loopback connection
> load material file: 'materials/village.mat'
> World model: 8050 triangles
> Planting grass ...
> Total grassy area is 0 units (0 cells)
> Planted 0 clumps of grass
> Starting the game...
> ubuntu has joined team 1
> Rerouted for 2 Edicts in 0.00s
> Used inventory slots: 0
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007fffe29e47b0 in BodyData::numBodyParts (this=0x0) at src/game/chr_shared.cpp:357
> 357 return _numBodyParts;
> (gdb) bt full
> #0 0x00007fffe29e47b0 in BodyData::numBodyParts (this=0x0) at src/game/chr_shared.cpp:357
> No locals.
> #1 0x00007fffe299b14e in G_ClientReadCharacter (ent=0x43e5d60)
> at src/game/g_client.cpp:1159
> k = 0
> teamDefIdx = 19
> #2 0x00007fffe299b70d in G_ClientTeamInfo (player=...) at src/game/g_client.cpp:1275
> ent = 0x43e5d60
> actorFieldSize = 1
> length = 8
> i = 0
> #3 0x000000000051c528 in SV_ExecuteClientMessage (cl=0x393fe50, cmd=4, msg=0x51ec670)
> at src/server/sv_user.cpp:294
> scopedMutex = {_mutex = 0x39401c0}
> #4 0x000000000051356d in SV_ReadPacket (s=0x396a0e0) at src/server/sv_main.cpp:657
> cmd = 4
> cl = 0x393fe50
> msg = 0x51ec670
> #5 0x00000000004eb9e0 in NET_Wait (timeout=0) at src/common/net.cpp:486
> s = 0x396a0e0
> tv = {tv_sec = 0, tv_usec = 0}
> ready = 0
> i = 0
> read_fds_out = {fds_bits = {0 <repeats 16 times>}}
> write_fds_out = {fds_bits = {0 <repeats 16 times>}}
> #6 0x00000000004ddd62 in Qcommon_Frame () at src/common/common.cpp:1558
> time_to_next = 0
> #7 0x000000000052d941 in main (argc=6, argv=0x7fffffffdfc8)
> at src/ports/linux/linux_main.cpp:55
> No locals.
> (gdb)