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Bug Title: Random lockups in rend32 branch
Operating System: Linux
Odamex Version: SVN r3958
Bug Description:
Game sometimes freezes hard, can't be exited due to still grabbing keyboard/mouse.
Got a few backtraces that all look similar:
#0 rt_draw4cols (sx=136) at /home/ant/code/odamex/client/src/r_drawt.cpp:457
#1 0x000000000059aa05 in R_RenderColumnRange (start=104, stop=271, top=0x74b500 <negonearray>, bottom=0x74e200 <viewheightarray>, posts=0x7d5340 <spriteposts>, colblast=0x612b46 <SpriteColumnBlaster()>,
hcolblast=0x612b5b <SpriteHColumnBlaster()>, calc_light=false, columnmethod=1) at /home/ant/code/odamex/client/src/r_segs.cpp:402
#2 0x0000000000612e52 in R_DrawVisSprite (vis=0xbbc040, x1=104, x2=271) at /home/ant/code/odamex/client/src/r_things.cpp:789
#3 0x0000000000614602 in R_DrawSprite (spr=0xbbc040) at /home/ant/code/odamex/client/src/r_things.cpp:1400
#4 0x0000000000614a10 in R_DrawMasked () at /home/ant/code/odamex/client/src/r_things.cpp:1472
#5 0x0000000000599ca6 in R_RenderPlayerView (player=0x18019a0) at /home/ant/code/odamex/client/src/r_main.cpp:1192
#6 0x000000000060c392 in D_Display () at /home/ant/code/odamex/client/src/d_main.cpp:288
#7 0x0000000000583a25 in CL_RenderTics () at /home/ant/code/odamex/client/src/cl_main.cpp:658
#8 0x000000000055bb8e in D_RunTics (logic_func=0x583a27 <CL_RunTics()>, render_func=0x583a1c <CL_RenderTics()>) at /home/ant/code/odamex/common/d_main.cpp:1162
#9 0x000000000060c5b3 in D_DoomLoop () at /home/ant/code/odamex/client/src/d_main.cpp:364
#10 0x000000000060da8c in D_DoomMain () at /home/ant/code/odamex/client/src/d_main.cpp:994
#11 0x000000000057b4c4 in main (argc=1, argv=0x7fffa7a27a48) at /home/ant/code/odamex/client/sdl/i_main.cpp:224
#0 0x00000000005dd43d in rt_draw4cols (sx=456) at /home/ant/code/odamex/client/src/r_drawt.cpp:514
#1 0x000000000059aa05 in R_RenderColumnRange (start=0, stop=1283, top=0x74b500 <negonearray>, bottom=0x74e200 <viewheightarray>, posts=0x7d5340 <spriteposts>, colblast=0x612b46 <SpriteColumnBlaster()>,
hcolblast=0x612b5b <SpriteHColumnBlaster()>, calc_light=false, columnmethod=1) at /home/ant/code/odamex/client/src/r_segs.cpp:402
#2 0x0000000000612e52 in R_DrawVisSprite (vis=0x2d786c0, x1=0, x2=1283) at /home/ant/code/odamex/client/src/r_things.cpp:789
#3 0x0000000000614602 in R_DrawSprite (spr=0x2d786c0) at /home/ant/code/odamex/client/src/r_things.cpp:1400
#4 0x0000000000614a10 in R_DrawMasked () at /home/ant/code/odamex/client/src/r_things.cpp:1472
#5 0x0000000000599ca6 in R_RenderPlayerView (player=0x35a6450) at /home/ant/code/odamex/client/src/r_main.cpp:1192
#6 0x000000000060c392 in D_Display () at /home/ant/code/odamex/client/src/d_main.cpp:288
#7 0x0000000000583a25 in CL_RenderTics () at /home/ant/code/odamex/client/src/cl_main.cpp:658
#8 0x000000000055bb8e in D_RunTics (logic_func=0x583a27 <CL_RunTics()>, render_func=0x583a1c <CL_RenderTics()>) at /home/ant/code/odamex/common/d_main.cpp:1162
#9 0x000000000060c5b3 in D_DoomLoop () at /home/ant/code/odamex/client/src/d_main.cpp:364
#10 0x000000000060da8c in D_DoomMain () at /home/ant/code/odamex/client/src/d_main.cpp:994
#11 0x000000000057b4c4 in main (argc=3, argv=0x7fffedc12dd8) at /home/ant/code/odamex/client/sdl/i_main.cpp:224