I've been having recurring issues with a game called sauerbraten (see bug  25597).  The game is unstable, but playable.  After a recent upgrade of mesa (and drm).  The game hangs as soon as I try to move (rotate, etc.) the initial screen.  I kill the game with -ABRT and see the following on the console:

bo(0xab603df8, 65536) is mapped (-1) can't valide it.
validated 0xab603df8 [0x4B8C8000, 0x4B91E000]
bo(0xab8fd6e0, 65536) is mapped (-1) can't valide it.
validated 0xab8fd6e0 [0x4BC81000, 0x4BC97000]
bo(0xab8fd6e0, 65536) is mapped (-1) can't valide it.
validated 0xab8fd6e0 [0x4C274000, 0x4C2B5000]
bo(0xab8fd6e0, 65536) is mapped (-1) can't valide it.
validated 0xab8fd6e0 [0x4B91E000, 0x4B974000]
bo(0xab603968, 65536) is mapped (-1) can't valide it.
validated 0xab603968 [0xD25E2000, 0xD25F2000]
bo(0xab603968, 65536) is mapped (-1) can't valide it.
validated 0xab603968 [0xD25E2000, 0xD25F2000]
bo(0xab6038c8, 65536) is mapped (-1) can't valide it.
validated 0xab6038c8 [0x4B4C8000, 0x4B51E000]

Here's the backtrace:

Program terminated with signal 6, Aborted.
[New process 13664]
[New process 13669]
[New process 13668]
#0  0xb7401f54 in ioctl () from /lib/libc.so.6

Thread 3 (process 13668):
#0  0xb76c8a7c in nanosleep () from /lib/libpthread.so.0
No symbol table info available.
#1  0xb778fb24 in SDL_Delay () from /usr/lib/libSDL-1.2.so.0
No locals.
#2  0x0000011b in ?? ()
No symbol table info available.
#3  0xb7701000 in ?? ()
No symbol table info available.
#4  0xb6fd9318 in ?? ()
No symbol table info available.
#5  0xb6fd9310 in ?? ()
No symbol table info available.
#6  0x00000000 in ?? ()
No symbol table info available.

Thread 2 (process 13669):
#0  0xb76c82c1 in write () from /lib/libpthread.so.0
No symbol table info available.
#1  0xb7754df5 in DSP_PlayAudio () from /usr/lib/libSDL-1.2.so.0
No locals.
#2  0x00001000 in ?? ()
No symbol table info available.
#3  0xb7798c3c in ?? () from /usr/lib/libSDL-1.2.so.0
No symbol table info available.
#4  0x00000000 in ?? ()
No symbol table info available.

Thread 1 (process 13664):
#0  0xb7401f54 in ioctl () from /lib/libc.so.6
No symbol table info available.
#1  0xb707f787 in drmIoctl (fd=5, request=1074291754, arg=0xbfd7d258)
    at xf86drm.c:184
	ret = -1
#2  0xb7081331 in drmGetLock (fd=5, context=3, flags=0) at xf86drm.c:1332
	lock = {context = 3, flags = 0}
#3  0xb651fc8c in radeonGetLock (rmesa=0x8457698, flags=0) at radeon_lock.c:64
	drawable = (__DRIdrawable * const) 0x876cce0
	readable = (__DRIdrawable * const) 0x876cce0
	sPriv = (__DRIscreen *) 0x842baa0
#4  0xb6520035 in radeon_lock_hardware (radeon=0x8457698) at radeon_lock.c:146
	ret = 1 '\001'
	rfb = (struct radeon_framebuffer *) 0x876cd60
	rrb = (struct radeon_renderbuffer *) 0x876d160
#5  0xb651b9a2 in rcommonFlushCmdBuf (rmesa=0x8457698, 
    caller=0xb6754e92 "radeonRefillCurrentDmaRegion") at radeon_common.c:1226
	ret = 0
#6  0xb651d464 in radeonRefillCurrentDmaRegion (rmesa=0x8457698, size=120)
    at radeon_dma.c:201
	dma_bo = (struct radeon_dma_bo *) 0xaa4f8830
	__FUNCTION__ = "radeonRefillCurrentDmaRegion"
	__PRETTY_FUNCTION__ = "radeonRefillCurrentDmaRegion"
#7  0xb651e18a in rcommonAllocDmaLowVerts (rmesa=0x8457698, nverts=3, vsize=40)
    at radeon_dma.c:441
	bytes = 120
	head = (void *) 0xadfccf78
	__FUNCTION__ = "rcommonAllocDmaLowVerts"
#8  0xb64ff3de in r200_alloc_verts (rmesa=0x8457698, n=3, size=10)
    at r200_swtcl.c:364
	rv = (void *) 0xadfccf78
#9  0xb64ff594 in r200_triangle (rmesa=0x8457698, v0=0xad99aca8, 
    v1=0xad99acd0, v2=0xad99acf8)
    at ../../../../../src/mesa/tnl_dd/t_dd_triemit.h:96
	vertsize = 10
	vb = (GLuint *) 0xadfccff0
	j = 0
	__FUNCTION__ = "r200_triangle"
#10 0xb65077dc in r200_render_triangles_elts (ctx=0x845c9d8, start=0, 
    count=2520, flags=52) at ../../../../../src/mesa/tnl/t_vb_rendertmp.h:182
	j = 1664
	rmesa = (r200ContextPtr) 0x8457698
	vertsize = 10
	r200verts = 0xad993020 "\231_­Â]\211,Â}[\032C¾j\033C\020\0311ÿÍÍÍÍkSì>\020±ø>kSì>\020±ø>ë·¬Âø50Â\003\226\031CJ¥\032C\020\0311ÿÍÍÍÍvjÐ>\020±ø>vjÐ>\020±ø>¿W®Â\022\236,Â\023\024\032CV#\033C\020\0311ÿÍÍÍÍkSì>Ò9è>kSì>Ò9è>\021°­Â­J0Â\231N\031Câ]\032C\020\0311ÿÍÍÍÍvjÐ>Ò9è>vjÐ>Ò9è>E+ªÂÒ\0361Âîr\026CP\202\027C\021\0313ÿÏÏÏÏÉè\f?Ò9è>Éè\f?Ò9è>"...
	elt = (const GLuint * const) 0xa86208a0
	stipple = 0 '\0'
#11 0xb66059fb in run_render (ctx=0x845c9d8, stage=0x84b37f0)
    at tnl/t_vb_render.c:320
	prim = 52
	start = 0
	length = 2520
	i = 0
	tnl = (TNLcontext *) 0x84b35c8
	VB = (struct vertex_buffer *) 0x84b3a04
	tab = (tnl_render_func *) 0xb67acf20
	pass = 0
	__PRETTY_FUNCTION__ = "run_render"
#12 0xb65f48d9 in _tnl_run_pipeline (ctx=0x845c9d8) at tnl/t_pipeline.c:153
	s = (struct tnl_pipeline_stage *) 0x84b37f0
	tnl = (TNLcontext *) 0x84b35c8
	__tmp = 895
	i = 9
#13 0xb64ea9fe in r200WrapRunPipeline (ctx=0x845c9d8) at r200_state.c:2460
	rmesa = (r200ContextPtr) 0x8457698
	has_material = 0 '\0'
	__FUNCTION__ = "r200WrapRunPipeline"
#14 0xb65f5bd2 in _tnl_draw_prims (ctx=0x845c9d8, arrays=0x84a1bb4, 
    prim=0xbfd7d698, nr_prims=1, ib=0xbfd7d6a8, min_index=0, max_index=1258)
    at tnl/t_draw.c:478
	this_nr_prims = 1
	bo = {0xaacaafb8, 0xab866b80, 0xb653d3bb, 0x845daf0, 0x845daac, 0x10, 
  0xb65b516f, 0x845c9d8, 0x84679d4, 0xbfd7d5e8, 0x84a32a0, 0x8456818, 
  0xb67ac560, 0xbfd7d5c8, 0xb65e07e5, 0x845c9d8, 0x400000, 0xc, 0x9d60, 
  0x84662ec, 0xb67ac560, 0xbfd7d5e8, 0xb653d3bb, 0x845c9d8, 0xb67ac560, 
  0xbfd7d5e8, 0x84b35c8, 0x0, 0x0, 0x6, 0x84a32a0, 0x0, 0xb67ac560}
	nr_bo = 2
	tnl = (TNLcontext *) 0x84b35c8
	TEST_SPLIT = 0
	max = 3000
	max_basevertex = 0
	i = 0
	__PRETTY_FUNCTION__ = "_tnl_draw_prims"
	__FUNCTION__ = "_tnl_draw_prims"
#15 0xb65f596c in _tnl_vbo_draw_prims (ctx=0x845c9d8, arrays=0x84a1bb4, 
    prim=0xbfd7d698, nr_prims=1, ib=0xbfd7d6a8, index_bounds_valid=1 '\001', 
    min_index=0, max_index=1258) at tnl/t_draw.c:384
No locals.
#16 0xb65e87db in vbo_validated_drawrangeelements (ctx=0x845c9d8, mode=4, 
    index_bounds_valid=1 '\001', start=0, end=1258, count=2520, type=5123, 
    indices=0x0, basevertex=0) at vbo/vbo_exec_array.c:663
	vbo = (struct vbo_context *) 0x849f9a8
	exec = (struct vbo_exec_context *) 0x84a0248
	ib = {count = 2520, type = 5123, obj = 0xab866b80, ptr = 0x0}
	prim = {{mode = 4, indexed = 1, begin = 1, end = 1, weak = 0, pad = 0, 
    start = 0, count = 2520, basevertex = 0}}
#17 0xb65e89f6 in vbo_exec_DrawRangeElementsBaseVertex (mode=4, start=0, 
    end=1258, count=2520, type=5123, indices=0x0, basevertex=0)
    at vbo/vbo_exec_array.c:771
	warnCount = 0
	ctx = (GLcontext *) 0x845c9d8
	__PRETTY_FUNCTION__ = "vbo_exec_DrawRangeElementsBaseVertex"
#18 0xb65e8a6d in vbo_exec_DrawRangeElements (mode=4, start=0, end=1258, 
    count=2520, type=5123, indices=0x0) at vbo/vbo_exec_array.c:788
	ctx = (GLcontext *) 0x845c9d8
#19 0xb65da994 in neutral_DrawRangeElements (mode=4, start=0, end=1258, 
    count=2520, type=5123, indices=0x0) at main/vtxfmt_tmp.h:353
No locals.
#20 0x08109e0e in vertmodel::vertmesh::render (this=0xabbfe3b8, as=0xbfd7d9cc, 
    s=@0xab8b2430, vc=@0xab8afa58) at engine/vertmodel.h:407
No locals.
#21 0x0810bf46 in vertmodel::vertmeshgroup::render (this=0xab8afa20, 
    as=0xbfd7d9cc, pitch=0, axis=@0xbfd7db70, d=0x0, p=0xab8a0148)
    at engine/vertmodel.h:696
	i = 0
	norms = true
	tangents = false
	vc = (vertmodel::vbocacheentry *) 0xab8afa58
#22 0x081043fd in animmodel::part::render (this=0xab8a0148, anim=164, 
    basetime=0, basetime2=0, pitch=0, axis=@0xbfd7db70, d=0x0, 
    dir=@0xbfd7db3c, campos=@0xbfd7db30, fogplane=@0xbfd7db20, as=0xbfd7d9cc)
    at engine/animmodel.h:753
	raxis = {{{x = 0, y = -1, z = 0}, v = {0, -1, 0}}}
	rcampos = {{{x = -180.492401, y = 26.5087528, z = 41.041748}, v = {
      -180.492401, 26.5087528, 41.041748}}}
	rdir = {{{x = 0.111491755, y = -0.849207222, z = 0.516155601}, v = {
      0.111491755, -0.849207222, 0.516155601}}}
	rfogplane = {<vec> = {{{x = 0, y = 0, z = 1}, v = {0, 0, 1}}}, 
  offset = -1.00000003e+16}
	pitchamount = 0
#23 0x08104b09 in animmodel::render (this=0xab89a0e8, anim=164, basetime=0, 
    basetime2=0, pitch=0, axis=@0xbfd7db70, d=0x0, a=0x0, dir=@0xbfd7db3c, 
    campos=@0xbfd7db30, fogplane=@0xbfd7db20) at engine/animmodel.h:867
	numtags = 0
	as = {{owner = 0xab8a0148, anim = 164, cur = {fr1 = 0, fr2 = 0, 
      t = 0}, prev = {fr1 = 138770072, fr2 = 0, t = 5.95393215e-34}, 
    interp = 1}, {owner = 0x8, anim = 3, cur = {fr1 = -1233827669, 
      fr2 = -1233468064, t = 6.03655655e-34}, prev = {fr1 = 3, fr2 = 64, 
      t = 1.79366203e-43}, interp = -3.73677904e-06}, {owner = 0xaacaac70, 
    anim = -1076372920, cur = {fr1 = -1235649292, fr2 = 138791384, 
      t = 2.2958874e-41}, prev = {fr1 = 4611, fr2 = -1076372888, 
      t = -3.65501432e-06}, interp = -1.02179723e-12}}
#24 0x081054a4 in animmodel::render (this=0xab89a0e8, anim=164, basetime=0, 
    basetime2=0, o=@0xaacaac58, yaw=983.099976, pitch=0, d=0x0, a=0x0, 
    color=@0xaacaac64, dir=@0xaacaac70, trans=1) at engine/animmodel.h:1001
	rdir = {{{x = 0.111491755, y = -0.849207222, z = 0.516155601}, v = {
      0.111491755, -0.849207222, 0.516155601}}}
	campos = {{{x = -180.492401, y = 26.5087528, z = 41.041748}, v = {
      -180.492401, 26.5087528, 41.041748}}}
	fogplane = {<vec> = {{{x = 0, y = 0, z = 1}, v = {0, 0, 1}}}, 
  offset = -1.00000003e+16}
#25 0x080f77df in renderbatchedmodel (m=0xab89a0e8, b=@0xaacaac58)
    at engine/rendermodel.cpp:547
	a = (modelattach *) 0x0
	anim = 164
#26 0x080f7bf7 in endmodelbatches () at engine/rendermodel.cpp:619
	bm = (batchedmodel &) @0xaacaac58: {pos = {{{x = 1488.00208, 
        y = 1536.00208, z = 1828.98926}, v = {1488.00208, 1536.00208, 
        1828.98926}}}, color = {{{x = 0.400000006, y = 0.606007457, 
        z = 1.21840334}, v = {0.400000006, 0.606007457, 1.21840334}}}, dir = {{
      {x = 0.856450975, y = 0.00866345782, z = 0.516155601}, v = {0.856450975, 
        0.00866345782, 0.516155601}}}, anim = 164, yaw = 983.099976, 
  pitch = 0, transparent = 1, basetime = 0, basetime2 = 0, flags = 16, 
  d = 0x0, attached = -1, query = 0x0}
	j = 0
	b = (modelbatch &) @0xacc02018: {m = 0xab89a0e8, flags = 16, 
  batched = {static MINSIZE = 8, buf = 0xaacaac58, alen = 8, ulen = 1}}
	rendered = true
	query = (occludequery *) 0x0
	i = 0
	transparent = {static MINSIZE = 8, buf = 0x0, alen = 0, ulen = 0}
#27 0x081abed6 in game::rendergame (mainpass=true) at fpsgame/render.cpp:211
	exclude = (fpsent *) 0x0
#28 0x080e8a4c in rendergame (mainpass=true) at engine/rendergl.cpp:1162
No locals.
#29 0x080ea37e in gl_drawframe (w=1280, h=800) at engine/rendergl.cpp:1594
	fogmat = 0
	abovemat = 0
	fogblend = 1
	causticspass = 0
#30 0x08095d46 in main (argc=3, argv=0xbfd7e0e4) at engine/main.cpp:1168
	frames = 255
	millis = 22940
	elapsed = 97
	dedicated = 0
	load = 0x0
	video = (const SDL_VideoInfo *) 0x8407060
	usedfsaa = 0
	gamecfgname = "data/game_fps.cfg", '\0' <repeats 242 times>
	initscript = 0x0
	usedcolorbits = 0
	useddepthbits = 0